On-Bright Electronics Shanghai Co., Ltdbonafidecn.com/PDF/2 in 1 demo board manual A1.pdfwith OB2268C+OB3316QP (Version: A1 Date: 17-Oct-2006) nrigt nfientia na 昂宝电子（上海）有限公司

昂宝电子（上海）有限公司 On-Bright Electronics （Shanghai）Co., Ltd

Page1 ©On-Bright Electronics Confidential OB_DOC_AN_2 in 1 OB2268C+3316 A1

OBPD48W-4L120B 2-in-1 Module Design with OB2268C+OB3316QP

(Version: A1 Date: 17-Oct-2006)

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Part.1 Schematic and PCB Information

1.1 Schematic:

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1.2 BOM Table: Parts Designator QTY Cost IC OB3369/SOP16 U203 1 AO4828(N MOSFET)/SOP8 U201,U202 2 OB2268C/SOP8 U101 1 Capacitors Ycap 101M Y2 CY1,CY2 2 Ycap 332M Y1 CY3 1 Xcap 0.33uF X2 CX1,CX2 2 C.C 102K 1KV C102 1 C.C 102K 100V C113,118 2 E.C 120uF/400V18*36mm C101 1 E.C 3.3uF/50V C108 1 E.C 10uF/50V C103 1 E.C 680uF/16V Low Esr C114,115,116 3 E.C 680uF/10V Low Esr C119 1 E.C 470uF/10V Low Esr C120,121 2 E.C 220uF/50V/Φ8×11.5 C201,202 2 SMD 1uF/25V/0805/Ceramic C206,208 2 SMD 100nF/25V/0805/Ceramic C203,218,224,225,226,227,228,229 8 SMD 39nF/25V/0805/Ceramic C205 1 SMD 10nF/25V/0805/Ceramic C204,207,209,210,215,217,221,223,124 9 SMD 1nF/25V/0805/Ceramic C111 1 SMD 1nF/50V/0805/Ceramic C107,109 2 SMD 100pF/25V/0805/Ceramic C123 1 SMD 560pF/50V/0805/Ceramic C211,212 2 SMD 10pF/3KV/1808/NPO C213,214,216,219,220,222 6 NC C104,110,112,117,122,203 0 Resistors MOVR 471K 07D MOV1 1 Thermal Resistor NTC 5R/3A RT1 1 NC R101,102,103,104,111,113,114,123,RT2 0 MOFR 100K 2W R108 1 MOFR 0.39R 1% 2W R118 1 CFR 51R/5% 1/2W R119, R120 2 SMD 1M/5% /1206 RX1,RX2 2 SMD 0ohm/5%/0805 R115 1 SMD 0ohm/5%/1206 J20,21,24 3

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SMD 3.6R/5%/1206 R107 1 SMD 10ohm/5%/1206 R109 1 SMD 10ohm/5%/0805 R202 1 SMD 27ohm/5%/0805 R116 1 SMD 22ohm/5%/0805 R212,213 2 SMD 33ohm/5%/1206 R210,211 2 SMD 390ohm/1%/0805 R224,222,226,228 4 SMD 47ohm/5%/1206 R110 1 SMD 1K/5%/0805 R125 1 SMD 2K/5%/0805 R126 1 SMD 3K/5%/0805 R124 1 SMD 560ohm /5%/0805 R214,216 2 SMD 5.1K/5%/0805 R234,235,236,237 4 SMD 5.1K/1%/0805 R129 1 SMD 10K/5%/1206 R219 1 SMD 10K/1%/0805 R127,131 2 SMD 10K/5%/0805 R201,205,207,223,227, 117 7 SMD 15K/0805/5% R204,206 2 SMD 24K/1%/0805 R112 1 SMD 33K/1%/0805 R208 1 SMD 39K/5%/0805 R128 1 SMD 51K/5%/0805 R220,229 2 SMD 100K/5%/0805 R203 1 SMD 110K/1%/0805 R209 1 SMD 300K/5%/0805 R130 1 SMD 910K/5%/0805 R105,106 2 SMD 1M /5%/0805 R215,217,218,221,225 5 Other Jumper J6-J19,J20,21(J22,23) 16 PWM IC OB2268C SOP U101 1 Photo Coupler PC817C U102 1 Inductor 2uH D5*20 L104,105 2 Transformer EFD30 530uH T101 1 UI9.8 Transformer T201,202 2 Bridge Diode KBL406 DB1 1 NC D101,Z101,Q102,Q103 0 Switching Diode 1N4148 D102 1 Fast Diode PG102 D103 1 Fast Diode FR107 D104 1 SMD Switching Diode 1N4148 D105, 203,206,207,209 5

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SB Diode MBR10100CT D106 1 SB Diode MBR2545CT D107 1 Zener Diode 5.6 1W Z101 1 Zener Diode 7.5V 1W Z102 1 MOSFET K2645 Q101 1 UU10.5 10mH LF1 1 5.6V Zener Diode SMD Z211 1 BAV99 Dual Diode SMD D201,202,204,205,208,210 6 Fuse 3A 250V F101 1 2N3904/SOT23 SMD Q201 1 IEC-C14 3Pin Socket CN101 1 10PIN Connector CN102 1 2PIN HV Connector CN201,202,203,204 4 MOSFET 2N7002/SOT23 SMD Q202,203,204,205,206 5 TL431 U103 1 Heat Sink AL 51*23*20mm HS1 1 Heat Sink AL 37*20*15 HS2, HS3 2 PCB OBPD48W-4L120B A0 1

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1.3 PCB Gerber File:

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Part.2 AC/DC Power Convertor Information

Index

1 Introduction ............................................................................................................................................ 8 2 Adaptor Module Specification ............................................................................................................. 8

2.1 Input Characteristic .......................................................................................................................... 8 2.2 Output Characteristic........................................................................................................................ 8 2.3 Protection Features ........................................................................................................................... 9 2.4 Environments ................................................................................................................................... 9 2.5 Product Safety .................................................................................................................................. 9 2.6 Transformer Design........................................................................................................................ 10 2.6.1 Specification ................................................................................................................................. 10 2.6.2 Winding Data ................................................................................................................................ 10 2.6.3 Schematic ..................................................................................................................................... 10

3 Performance Evaluation .................................................................................................................... 11 3.1 Input Characteristics....................................................................................................................... 12 3.1.1 Input Current (at full load)........................................................................................................... 12 3.1.2 Standby Power ............................................................................................................................. 12 3.1.3 Efficiency....................................................................................................................................... 12 3.2 Output Characteristics .................................................................................................................... 12 3.2.1 Line Regulation (at full load) ...................................................................................................... 12 3.2.2 Cross Regulation (at normal line).............................................................................................. 12 3.2.3 Ripple & Noise ............................................................................................................................. 13 3.2.4 Over shoot & Under shoot (at full load) .................................................................................... 14 3.2.5 Dynamic Test ................................................................................................................................ 15 3.2.6 Time Sequence (at full load) ...................................................................................................... 16 3.3 Protection Function ........................................................................................................................ 17 3.3.1 Over Power Protection (OPP).................................................................................................... 17 3.3.2 Over Voltage Protection (OVP).................................................................................................. 18 3.3.3 Short Circuit Protection (SCP) ................................................................................................... 18 3.4 Brownout test ................................................................................................................................. 18 3.5 Brownout recover test .................................................................................................................... 18

4 System other important waveform ................................................................................................... 19 4.1 Vdd, Fb, Sense and Gate waveform at NL, LL and FL.................................................................. 19 4.2 Output diode VAK Waveform ........................................................................................................ 20 4.3 MOSFET VDS waveform @264V /50Hz full load........................................................................ 20

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1 Introduction

This document presents performance characteristics of a flyback convertor module designed with OB2268C. The module features:

Small OCP variation over universal input range implemented with simple design approach. (US Patent Pending)

Very low standby power achieved. (US Patent Pending) Audio free operation thanks to On-Bright proprietary technology.

This document contains sessions on power supply specification, transformer design and performance data.

2 Adaptor Module Specification

Model Number: OBPD48W-4L120B

2.1 Input Characteristic

AC input voltage rating: 100VAC to 240VAC

AC input voltage range: 90VAC to 264VAC

AC input frequency: 47Hz to 63Hz

Inrush current: Less than the ratings of it’s critical components (Including bulk

rectifiers, fuse and surge limiting device)

Input Current: 1.5A (rms) Max. at full load and 90Vac~132Vac/60HZ input

1.0A (rms) Max. at full load and 180Vac~264Vac/50HZ input

Efficiency: 80％ Min at maximum load and normal line.

Standby Power: Less than 0.3 W under 240Vac line and no load

2.2 Output Characteristic

Output Voltage: +12.0V & + 5.0V

Minimum output current: +5V/0.1A ; +12V/0A

Continuous maximum output current: +5V/3.5A ; +12V/2.6A

Line Regulation:±1%

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Load Regulation: 5V/±5% ; 12V/±5%

Ripple & Noise: +5V/80 mV Max ; +12V/150mV Max

Hold up Time: 10mS Min. at normal line and full load

Turn on Delay Time: 1S. Max. at normal line and full load

2.3 Protection Features

Over Voltage Protection: 17.5V Max for 12V and 7.5V Max for 5V, with

automatic recovery function.

Over Power Protection: 110%~140% of output power, with automatic recovery

function.

Short Circuit Protection: Short circuit placed on any DC output will shut down

all DC outputs, the unit will recover when short condition is removed.

2.4 Environments

Operating

Temperature: 0 to + 45℃ ℃

Relative Humidity: 20 % to 90 % RH

Storage

Temperature: -40 to 60 ℃ ℃

Relative Humidity: 0 % to + 95 % RH, non-condensing

2.5 Product Safety Leakage Current: The AC leakage current is less than 3.5mA when the power

supply connect to 264V/50Hz.

Insulation Resistance: The insulation resistance should be not less than 30M

Ohm after applying of 500VDC for 1 minute

Dielectric Voltage Withstand: The power supply shall withstand for 1 minute without breakdown

by the application of a 60Hz 1500V AC voltage applied between both input line and chassis

(20mA DC cut-off current). Main transformer shall similarly withstand 3000Vac applied between

both primary and secondary windings for a minimum of one minute.

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2.6 Transformer Design 2.6.1 Specification

1) Bobbin: EFD30 (12Pin)

2) Core material: Equal PC40 (TDK).

3) Inductance (AT: 1KHz 0.25V)

L(1-3) : 510~542uH

4) Leakage Inductance (AT: 1KHz 0.25V)

L(1-3) : 15uH Max (Short other pins)

5) HI-POT: (Ac 50Hz or 60Hz 5mA 60Sec).

Pri. to Sec: 3000V

Pri. to Core :1500V

Sec to Core :1500V.

2.6.2 Winding Data Step Winding Start Finish Wire (mm) Ts

1 N1 Pin1 Pin2 0.31*2 38

2 N2 Pin9,10 Pin7,8 0.5*6 4

3 N3 Pin12 Pin10 0.41*3 5

4 N4 Pin2 Pin3 0.31*2 14

5 N5 Pin5 Pin6 0.1*6 13

2.6.3 Schematic

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3 Performance Evaluation

Test Equipments AC Source: APE AFR-105W Digital Power Meter: YOKOGAWA WT210 Electrical Load: Prodigit 3310C Oscilloscope： LeCroy WS424

Test Temperature: Room Tem

Test Result

Test Item Test Result 1.1 Input characteristic Input current (90Vac~132Vac/60Hz) Input current (180Vac~264Vac/50Hz) Standby power Efficiency

1.10A @90V/60Hz 0.64A @180V/50Hz 0.27W@264V/50Hz 82.0% @110V/60Hz

1.2 Output characteristic Line regulation& Load regulation

5V/0.4%; 12V/0.7% 5V/0.6%; 12V/0.8%

Ripple & noise +5V/ 52mV +12V/ 69mV

Over shoot & Under shoot Over shoot: 3.2% Max

Under Shoot: 3.3% Max

Dynamic test 4.89V~5.10V 11.74V~12.39V

1.3 Time sequence Turn on delay time 934mS @90V/60Hz Hold up time 11mS @90V/60Hz Rise time 9mS Fall time 7mS 1.4 Protection

Over voltage protection(Full load) 5V/ 5.73V 12V/ 14.1V

Over power protection 120%~134% Short Circuit protection OK 1.5 Brownout/Brownout recovery OK

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3.1 Input Characteristics 3.1.1 Input Current (at full load)

Input Voltage 90V/60Hz 110V/60Hz 132V/60Hz 180V/50Hz 220V/50Hz 264V/50Hz

Input Current 1.10 0.94 0.79 0.64 0.58 0.48

3.1.2 Standby Power

Input Voltage 90V/60Hz 110V/60Hz 132V/60Hz 180V/50Hz 220V/50Hz 264V/50HzPin (W) 0.09 0.10 0.12 0.16 0.21 0.27

3.1.3 Efficiency

Remark: All data were measured at the terminal of Sense cable

25% load 50% load 75% load 100% load

90Vac/60Hz 84.9 83.6 82.1 80.4 82.8

110Vac/60Hz 84.2 83.9 83.1 82.0 83.3

132Vac/60Hz 84.8 84.5 83.8 83.2 84.1

180Vac/50Hz 84.2 85.1 84.4 84.2 84.5

220Vac/50Hz 83.6 84.3 84.6 84.2 84.2

264Vac/50Hz 81.9 83.6 84.4 84.0 83.7

Effi(Average) 83.9 84.2 83.7 83.0

InputEffi (%) Effi

(Average)

3.2 Output Characteristics 3.2.1 Line Regulation (at full load) Output voltage range: 5V/4.75V~5.25V; 12V/11.40V~12.60V

Line regulation: 1% Max Remark: All data were measured at the terminal of sense cable.

Input Voltage 90V/47Hz 110V/60Hz 132V/63Hz 180V/47Hz 220V/50Hz 264V/63Hz Regulation+5V 4.97 4.98 4.98 4.98 4.99 4.99 0.4%

Output +12V 12.09 12.05 12.03 12.00 12.00 12.00 0.75%

3.2.2 Cross Regulation (at normal line)

Load condition: Voltage Load1 Load2 Load3 Load4 Load5 Load6 Load7 +5V (A) 3.5 0 0.7 0.7 2.8 0.1 0.1 +12V (A) 2.6 0 0.52 2.08 0.52 1.5 0

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Test Result Input Output Load1 Load2 Load3 Load4 Load5 Load6 Load7

5V (V) 4.98 5.01 5.05 5.09 4.97 5.14 4.92 110V

12V (V) 12.05 12.10 11.92 11.73 12.34 11.54 12.45 5V (V) 4.99 5.01 5.04 5.09 4.92 5.15 4.92

220V 12V (V) 12.01 12.11 11.94 11.73 12.34 11.53 12.46

3.2.3 Ripple & Noise Load condition

Load Full Load (A) No Load (A) 5V 3.5 0

12V 2.6 0 Test result

Ripple & Noise (mV) Input Output

Full Load No Load 5V 52 11

110V/60Hz 12V 69 5 5V 48 16

220V/50Hz 12V 30 7

Remark: Ripple & Nnoise were measured at the terminal of DC cord with a 0.1uF ceramic cap

connected in parallel with a 10uF Electrolytic cap. Bandwidth was limited to 20MHZ.

Ripple & Noise Waveform (Channel 1/12V ; Channel 2/5V)

R&N waveform @110V/60HZ Full load R&N waveform @220V/50HZ Full load

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R&N waveform @110V/60HZ No load R&N waveform @220V/50HZ No load 3.2.4 Over shoot & Under shoot (at full load)

Input Output Over Shoot (%) Under Shoot (%)

5V 1.9 1.9 110V/60Hz

12V 2.1 3.2 5V 3.2 3.3

220V/50Hz 12V 2.8 3.2

Overshoot & Undershoot Waveform (Channel 1/12V ; Channel 2/5V)

Overshoot waveform@110V/60Hz full load Overshoot waveform@220V/50Hz full load

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Undershoot waveform@110V/60Hz full load Undershoot waveform@220V/50Hz full load 3.2.5 Dynamic Test Test condition:

Load : Load1/20% of full load; Load2/80% of full load. Time : Rise Time = Fall Time = 50mS

Test result

Dynamic Voltage Input

5V 12V 110V/60Hz 4.89V ~ 5.10V 11.74V ~12.39V 220V/50Hz 4.89V ~5.10V 11.74V ~12.39V

Dynamic Waveform(Channel 1/ 12V ; Channel 2/ 5V)

Dynamic waveform@110V/60Hz Dynamic waveform@220V/50Hz

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3.2.6 Time Sequence (at full load) Test Result

Time Sequence (mS) Input

Turn on delay time Hold up time Rise time Fall time 90V/60Hz 934.26 11.43 8.95 7.35 264V/50Hz 292.11 139.53 7.03 7.56 Pass/Fail Pass Pass Pass Pass

Time Sequence Waveform(Channel 1/12V ; Channel 2/5V ; Channel 3/ AC Input)

Turn on delay time waveform@90V/60Hz Turn on delay time waveform@264V/50Hz

Hold up time waveform@90V/60Hz Hold up time waveform@264V/50Hz

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Rise time waveform@90V/60Hz Rise time waveform@264V/50Hz

Fall time waveform@90V/60Hz Fall time waveform@264V/50Hz

3.3 Protection Function 3.3.1 Over Power Protection (OPP) Test Result

Input OPP (W) Rate Of Output Power 90V/60Hz 56.8 1.18 110V/60Hz 59.4 1.24 132V/60Hz 60.7 1.26 180V/50Hz 61.5 1.28 220V/50Hz 60.9 1.27 264V/50Hz 59.8 1.25

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3.3.2 Over Voltage Protection (OVP) Test load: Full load Test Result

OVP (V) Input

5V 12V 220V/50Hz 5.73 14.1

Remark : Measuring output voltage under photocoupler secondary pin is shorted, and output voltage

should recover when the shorte condition is removed. 3.3.3 Short Circuit Protection (SCP) Test load: Full load Spec: Short circuit placed on any DC output will shut down all DC outputs, the unit will recover

when the short condition is removed. Test Result

Output Input

5V 12V 110V/60Hz OK OK 220V/50Hz OK OK

3.4 Brownout test The power supply meets specification while the line voltage is reduced from 90Vac to 0Vac in 5V decrement every 10 minutes. Full load is connected at output during test.

3.5 Brownout recover test The power supply meets specification while the line voltage is increased from 0Vac to 90Vac in 5V increment every 10 minutes. Full load is connected at output during test. The Brownout/Brownout recovery test results are list in below table . The module passes Brownout/Brownout recovery test. Brownout/Brownout recovery test results

Brownout test Brownout recovery test

Input voltage Input powe(W)r (90Vac to 0Vac)

Input voltage Input power(W) (0Vac to 90Vac)

90Vac/60HZ 60.5 60Vac/60HZ Protection 85Vac/60HZ 61.0 65Vac/60HZ 63.6 80Vac/60HZ 61.6 70Vac/60HZ 63.3 75Vac/60HZ 62.5 75Vac/60HZ 62.5 70Vac/60HZ 63.3 80Vac/60HZ 61.6 65Vac/60HZ 63.6 85Vac/60HZ 61.0 60Vac/60HZ Protection 90Vac/60HZ 60.5

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4 System other important waveform

4.1 Vdd, Fb, Sense and Gate waveform at NL, LL and FL

Vdd,Fb,Sense&Gate waveform@90V/60Hz,no load Vdd,Fb,Sense&Gate waveform@90V/47Hz,0.4W load

Vdd,Fb,Sense&Gate waveform@264V/50Hz,no load Vdd,Fb,Sense&Gate waveform@264V/50Hz,0.4W load

Vdd,Fb,Sense&Gate waveform@90V/60Hz,full load Vdd,Fb,Sense&Gate waveform@264V/50Hz,full load

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4.2 Output diode VAK Waveform

+5V Rectifier VAK waveform@264V/50HZ, full load +12V Rectifier VAK waveform@264V/50HZ, full load

4.3 MOSFET VDS waveform @264V /50Hz full load

VDS waveform under start situation VDS waveform under normal operation

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VDS waveform under output is short to ground

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Part.3 CCFL Inverter Test Information

3.1 系统特性：低成本 Push-pull 架构内置 burst mode 调光（有正/负调光的芯片可供选择）, 支持内部 burst mode

频率调节，提供外部 PWM 和 analog 调光（可选）高精度工作频率控制，采用定频工作模式，支持 Striking 频率调节 Soft on/off 时间可调系统和 IC 双重欠压保护功能灯管失效保护功能过压保护功能

3.1.1 输入&输出参数：

3.1.1.1 输入参数：

输入电压： 10.8~13.2V 调光电压： 0V（MIN. Brightness）,3V（MAX. Brightness）① 开关电压： 0-0.8V（关），2-5V（开）输入电流： 2A（MAX.） Strike 频率： 63-67KHz 工作频率： 48KHz,52KHz（典型值）

3.1.1.2 输出参数： Strike 电压：1200V（RMS）（最小值）工作电压： 650V（RMS）（最小值）输出电流： 6.5~7.5（mARMS）

① OB3316 采用正调光模式，调光电压为 0V 时输出最暗，为 3V 时输出最亮；另有可选之负调光版本 OB3316N，调光电压为 3.25V 时输出最暗，为 0.15V 时输出最亮

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3.2 Inverter 性能测试： 3.2.1 测试示意图以及测试设备：

+Vin

Gnd

DIM

ENA

Item Test

equipment Model Vendor

① DC Power Supply GPS-3303C 3CH GW INSTEK

② High Voltage Probe P6015A 1000X Tektronix

③ Multimeter 45 FLUKE

④ Current Amplifier TCP 300 Tektronix

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3.2.2 测试参数一览表 Model: OBPD48W-4L120B A1 Date: 2006-05-18

No. Item Check list

A Inf.

Main control IC: OB3316 push-pull

Dimming mode: Burst mode

Lamp quantity: 100K dummy load X4

Input voltage: typical 12V

Operation frequency: 48KHz~52KHz

Burst frequency: 195Hz~205Hz

Turns ratio: 18:18:2280

Endure voltage: 1500V rms 60sec

Secondary DCR: 420ohm+15%

Secondary leakage inductor: 220mH+10%

Result

Open lamp voltage less than 95% of endure voltage? OK

Normal running voltage less than 85% of endure voltage? OK

B X’FMR

Striking voltage higher than lamps’ start up voltage (1200V)? OK

C Striking Time Striking time >1S? OK

Inrush current less than Spec. or I2T? OK D Input Current

Normal running current less than 60% of Spec. (4A)? OK

Operating range of VGS less than 90%of Spec. (+20V)? OK E Switching

Operating range of VDS less than 90%of Spec. (+60V)? OK

F Balance Current difference less than 1mA? OK

G Efficiency Higher than 85%? OK

72 hours run in test OK

24 hours 40oC burn in test none

-20~70oC thermal shock test none H Reliability

Vibration test none

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Check Items List: Figure1. System striking frequency & striking voltage

Figure 2.striking process control and striking timer

Figure 3. Normal operating frequency & voltage

Figure 4.Soft start

Figure 5.soft on/off time

Figure 6 Burst mode dimming

Figure 7.MOSFET VGS & VDS waveform

Figure 8.Input voltage ripple

Figure 9.System inrush current

Figure 10. Open lamp protection in normal operating condition.

Figure 11. Output current wave crest factor

Figure 12. System efficiency

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3.2.3 系统 Striking 频率和电压

测试项目最小值典型值最大值测试结果图示

Striking 频率（KHz） 63 65 67 66.5 Figure1

Striking 电压

（VRMS） - 1200 - 1250 Figure1

测试条件输入电压：12V,

测试环境：温度：25℃，湿度：85%

3.2.4 Striking time &VS voltage& STIME voltage


Striking time(S)1 - 1 - 1.16 Figure2

VS regulation voltage(V)

- 3 - 3.12 Figure2

STIME protection voltage(V)

- 2.6 - 2.65 Figure2

测试条件输入电压：12V,


3.2.5 工作频率和输出电压


工作频率（KHz） 48 50 52 50.5 Figure3

输出电压（VRMS） - - - 687 Figure3

测试条件输入电压：12V,测试负载：100Kohm


1 Strike time 同 C206 参数有关，其值可近试于 C206（uF）数值，此处参数供参考，客户可根据需要调整

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3.2.6 Soft start time & Soft on/off time


Soft start time(mS)

- / - 15.6 Figure4

Soft on time(uS) - / - 507.5 Figure5

Soft off time(uS) - / - 554.2 Figure5

测试条件同上

3.2.7 内置 burst mode 调光


输入电压（V） 0 / 3 / /

Burst 频率（Hz） 180 200 220 200.35 Figure6

测试条件同上

3.2.8 MOSFET Vds & Transformer terminal Voltage


Vds1（V） - ±60V - 34.4 Figure7

Vds2（V） ±60V 35.0

Vds3（V） ±60V 34.4

Vds4（V） - ±60V - 33.8 Figure7

测试条件同上

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3.2.9 系统电压 ripple& 电流 inrush


电压 ripple（mv） - / - 73（全亮模式）

170（调光模式） Figure8

测试条件同上

3.2.10 灯管失效保护&波形因素


灯管失效保

护时间

（mS） - 20 - 20.1 Figure10

电流波形因

素 1.2726 1.414 1.5554 1.484 Figure11

测试条件同上

3.2.11 输入电压&效率

测试项目最小值典型值最大值测试结果

输入电压（V） 10.8 12 13.2 - 12 -

效率（%） - 82 - - 89.9 -

测试条件负载：100Kohm，测试环境：温度：25℃，湿度：85%

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Figure 1.System striking frequency & striking voltage

CH1: Gate1 Striking frequency: 66.5KHz CH2: None CH3: Output voltage Striking voltage: 1250KV CH4: Output current Test condition :Start with lamp open then check output voltage

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Figure 2.Striking process control and striking timer

CH1: Gate1 Striking time approximately is 1S CH2: VS Regulated to 3.12V CH3: Striking voltage CH4: STIME Shutdown when STIME voltage rises to 2.65V threshold Test condition :Start with lamp open then check output voltage and it’s maintain time Note: 系统启动后，gate 驱动的 PWM 信号占空比由小到大张开，使变压器高压端输出电压（striking voltage）由小到大变化，VS pin 电压（由 striking voltage 分压所得）也随之增大，当 VS pin 电压达到

3V 时，IC 会保持住此时的 PWM 占空比，从而使 striking voltage 维持在当前的输出电压进行点灯。同

时 IC 开始点灯计时，用 2.6uA 电流对 STIME pin 外接电容进行充电，当 STIME pin 电压充到 2.6V 时

计时结束。此时若 CS pin 电压（由灯管电流流过反馈电阻产生）还未上升到 0.35V 以上，IC 即判断点

灯失败，IC 进入 latch 状态。在此之前，一旦 CS pin 电压到达 0.35V 以上，IC 即判断点灯成功，并立

即从点灯模式切换到正常工作模式。

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Figure 3. Normal operating frequency & voltage

CH1: Gate1 Normal operating frequency: 50.5KHz CH2: None CH3: Output voltage CH4: Output current

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Figure 4. Soft start time

CH1: Gate1 CH2: CMP Soft start time: 15.6mS CH3: CS CH4: Output current 说明：soft-start 有助于减缓系统启动时电流对 inverter 器件及 CCFL 灯管的冲击.

soft start 斜率 TV ΔΔ 可近似用下面公式计算：

OB3318

ENA

SST/CMP

CS

NC

STIME

VS

VDDA

P-GATE N-GATE

1

2

3

4

5

6

7

8PGND

RI

RT

AGND

BF/DMOD

DIM

SVD

9

10

11

12

13

14

15

16C3

TV

ΔΔ

=)(//*

4.25*10*3 6

kohmRTRIC

−

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Figure 5. Soft on/off time

CH1: Gate1 CH2: CMP Soft on time:507.5uS, Soft off time: 554.2uS CH3: CS CH4: Output current

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Figure 6. Internal burst mode dimming control (1: Max. brightness)

CH1: None CH2: BF Burst frequency:200.35Hz CH3: DIM DIM=3.03V CH4: Output current Output current: 6.91mA Note: burst mode 产生机理，主要是通过 BF pin 所连之电容充放电从而产生上图所示之三角波，幅值

1~3V，外部输入 DC 电压（DIM 电压）与之比较，产生一 LPWM 波，通过 DC 之大小来调节 LPWM duty cycle,从而形成 burst 调光模式，DC 调光范围从 0V~3V，大致对应于灯管亮度 10%~100%，

Fburst(Hz)=)(8

2000nFC

.

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Figure 6. Internal burst mode dimming control (2: Medium brightness)

CH1: None CH2: BF Burst frequency: 200.35Hz CH3: DIM DIM=2.5V CH4: Output current Output current: 6.28mA

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Figure 6. Internal burst mode dimming control (3: Min. brightness)

CH1: None CH2: BF Burst frequency: 200.36Hz CH3: DIM DIM=0V CH4: Output current Output current: 2.12mA

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Figure 7. MOSFET VGS & Transformer primary terminal waveform

CH1: Gate1 CH2: Gate2 CH3:V_ds1,V_ds3 V_ds1 voltage: 34.4V (pk-pk); V_ds3 voltage: 34.4V (pk-pk) CH4:V_ds2,V_ds4 V_ds2 voltage: 35.0V (pk-pk); V_ds4 voltage: 33.8V (pk-pk) Check VDS voltage, make sure that it’s less than 60% of MOSFET Spec. AO4828 Spec.: Vgs:±20V Vds:±60V

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Figure 8. System power voltage ripple （continues mode & burst mode dimming）

CH1: VIN System power voltage ripple: 73mV(continues mode) & 170mV(burst mode) CH2: None CH3: None CH4: None

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Figure 9. System inrush current (continues mode & burst mode dimming)

CH1: None CH2: None CH3: None CH4: System input currentinrush current:0.41A(continues Mode)&0.31A(burst Mode)

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Figure 10. Open lamp protection in normal operating condition.

CH1: N-GATE Protection delay time: 20.1mS CH2: CMP CH3: CS Test condition :In normal operation condition, suddenly move out lamp, the inverter should shutdown within 20ms 灯管失效保护功能：当灯管突然移开、损坏、短路时，CS 电压被迅速拉低（<0.35V），此时 IC开始计时，持续 20ms,如果 CS 电压没有被恢复（>0.35V）,系统关断，从而达到保护之目的。On-Brig

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Figure 11. Output current wave crest factor

CH1: None CH2: None CH3: None CH4: Output current wave Ioutput_rms: 7.11mA, Ioutput_pk-pk: 21.1mA

Crest factor: 484.111.721.21

sIoutput_rm2pk-Ioutput_pk

=•

=• mA

mA

Spec.: 1.414+10%=(1.2726~1.5554)On-Brig

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Figure 12. System efficiency Test in max brightness condition (DIM>3.0V). Output current: ①7.10mA, Load impedance: 101.3Kohm

②7.26mA, Load impedance: 99.45Kohm

③7.31mA, Load impedance: 98.49Kohm

④7.16mA, Load impedance: 98.9Kohm Output power: 20.68W Input voltage: 12.115V, input current:1.90A, input power rate: 23.01W System efficiency:20.68/23.01=89.9%

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Documents

On-Bright Electronics Shanghai Co., Ltdbonafidecn.com/PDF/2 in 1 demo board manual A1.pdfwith OB2268C+OB3316QP (Version: A1 Date: 17-Oct-2006) nrigt nfientia na 昂宝电子（上海）有限公司