DMB Technology Preliminary

4 Lamps Inverter Application Datasheet using DT8211

DT8211 Application (19”wide & 20.1”wide Panel)

4 Lamps Inverter Application Datasheet using DT8211
Rev1.0 - 18 April 2008 Application Datasheet

1. General description
This application is an example circuit of 4 lamps inverter using DT8211. The design
contains protection functions such as OLP, OVP, SCP and basic functions such as
ADIM (Analog Dimming) and BDIM (Burst Dimming). This design is intended to show
how to use DT8211, implement basic functions and protection functions, and design
a circuit. This document contains features, schematic, and bill of materials.

2. Features
n Fixed Frequency Half Bridge Topology
n Designed for 4 Lamp Inverter Solution
n Positive Polarity Analog Dimming (Negative Polarity Possible)
n Positive Polarity Internal Burst Dimming (Negative Polarity Possible)
n ADIM & BDIM Polarity Selectable
n Simultaneous Operation of ADIM and BDIM
n Open Lamp Protection
n Open Lamp Voltage Regulation (Over Voltage Protection)
n Short Circuit Protection (HOT-GND, COLD-GND)

3. Applications
n 4 Lamp CCFL Backlight Inverter Module
n Monitor
n TV
www.DataSheet4U.com n Advertisement Board

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Application Circuit Rev1.0 – 18 April 2008 1 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

4. Pinning information
Pin Symbol Description
1 VCC Power Input
2 EN ON/OFF Control Pin
3 BDIM Burst Dimming DC Level
4 ADIM Analog Dimming DC Level
5 GND Ground
6 GND Ground

5. Absolute maximum ratings

Parameter Symbol Conditions Unit
Input Supply Voltage VIN +45.0 V

6. Electrical characteristics
TA = 25°C, unless otherwise specified
Parameter Symbol Conditions Min Typ Max Unit
Power Supply section
Input Voltage VIN 12.0 V
Input Current IIN VIN=12.0V 2.5 A
General Function section
ADIM Input
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VADIM 0 3.3 V
BDIM Input VBDIM 0 4.5 V
VADIM=3.3V
6.8 7.5 8.0 mA
VBDIM=4.5V
VADIM=0V
Output Current IOUT 2.5 3.5 4.5 mA
VBDIM=4.5V
VADIM=3.3V
2.5 3.5 4.5 mA
VBDIM=0V
Enable Input for Turn-On VON 2.0 VIN V
Enable Input for Turn-Off VOFF 0 0.8 V
Oscillator section
Main Oscillation Frequency FMAIN 50 kHz
Burst Oscillation Frequency FBURST 300 Hz
Protection Function section
Open Lamp Protection Time TOLP 1 2 sec.
Over Voltage Protection VOVP 1600 V

© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 2 of 11
 FU1
J1 3216/3.0A/24V
VCC VCC
1 EN_IN C1 T1 J2
2 BDIM_IN 3216/10uF/16V 1 HV1 HV1

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3
3
3 ADIM_IN Q2 9 LV1 1
4 S Q1 S C2 8 2
5 3216/10uF/16V 2 HV2 35001WR-02
6 HOUT 4 4 HOUT 3 HV3
25043WR-06 5 5 C3 7 J3
D D
7. Schematic
DMB Technology

6 6 3216/10uF/16V 6 HV2
4 HV4 LV2 1

Application Circuit
+ C5 C31 C32 7 7 2
VREF R1 8 8 C8 C9 C11 C12 35001WR-02
11k 1u 1u D D
C38 J4
LOUT 2 2 LOUT NC HV3
BDIM_IN R3 BDIM VFB1 LV3 1
S S

3pF/3kV
3pF/3kV
3pF/3kV
3pF/3kV
VFB2 2

25V/1000uF
18k STM8319 STM8319

1
1
C13 VFB3 35001WR-02
R6 100n VFB4
4.3k R5 J5
NC HV4
R8 C34 R9 C35 R10 C36 R11 C37 LV4 1
2
35001WR-02

3k
3k
3k
3k

3.3n
3.3n
3.3n
3.3n
VREF R2
22k

ADIM_IN R4 ADIM
9.1k
C14
R7 100n
9.1k

VREF

R12
U1 DT8211 47k LV4
VREF 1 18 VCC LV3
EN_IN 2 VREF VCC 17 HOUT LV2
ADIM 3 EN HOUT 16 LOUT IFB LV1
BDIM 4 ADIM LOUT 15 BAV70
BDIM GND

Rev1.0 – 18 April 2008

5 14 D1 3 VFB1
3
2
3
2
3
2
3
2

6 RTS GND 13 1 D2 D3 D4 D5
R13 7 RT VCMP 12 2 VFB2
8 CT ICMP 11 BAV70 BAV70 BAV70 BAV70
9 CTB VFB 10 3 VFB3
1
1
1
1

PROT IFB 1
VFB4

100k
C15 C16 C17 C18 C19 C20 C21 C22 C23 R14 C24 C25 C26 2 R15 R16 R17 R18
D6 C27 C28 C29 C30 R19 R20 R21 R22
IFB

1n
1n
1n
1n
BAV70

47n

6.8n
1.5n

100n
220n
100k
330n
100n
R23 10n 10n 10n 10n
2k/1%
2k/1%
2k/1%
2k/1%

100p/COG
470/1%
470/1%
470/1%
470/1%

47k/1%
Pin Description Specification
1.VCC = 12+-10% Lam p Fre que ncy = 50k Hz
2.Ena = TTL LEVEL Burs t Fre que ncy = 300Hz
3.BDIM = 0~4.5V(P) Output Curre nt = 3.5m A~7.5m A
4.ADIM = 0~3.3V(P) Strik ing Voltage = 1.6k V rm s
5.GND
6.GND
4 Lamps Inverter Application Datasheet using DT8211

© 2008 DMB Tech. All Rights Reserved

DT8211 Application

3 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

8. Bill of Material

Item Q’ty Reference Number Part Number

Resistor 1 R1 11k
Resistor 1 R2 22k
Resistor 1 R3 18k
Resistor 2 R4,R7 9.1k
Resistor 1 R6 4.3k
Resistor 4 R8,R9,R10,R11 3k
Resistor 2 R12, R23 47k/1%
Resistor 2 R13,R14 100k
Resistor 4 R15,R16,R17,R18 2k/1%
Resistor 4 R19,R20,R21, R22 470/1%
Capacitor 3 C1,C2,C3 3216/10uF/16V
Capacitor 1 C5 25V/1000uF
Capacitor 4 C8,C9,C11,C12 3pF/3kV
Capacitor 4 C13,C14, C16,C26 100n
Capacitor 1 C25 330n
Capacitor 4 C15,C17,C22,C23 1n
Capacitor 1 C18 100p/COG
Capacitor 1 C19 6.8n
Capacitor 1 C20 1.5n
Capacitor
www.DataSheet4U.com 1 C21 220n
Capacitor 1 C24 47n
Capacitor 4 C27,C28,C29,C30 10n
Capacitor 2 C31, C32 1u
Capacitor 4 C34,C35,C36,C37 3.3n
Resistor/Capacitor 2 R5, C10 NC
Diode 6 D1,D2,D3,D4,D5,D6 BAV70
Fuse 1 FU1 3216/3.0A/24V
Connector 1 J1 J-25043WR-06
Connector 4 J2,J3,J4,J5 J-35001WR-02
FET 2 Q1, Q2 STM8319
Transformer 1 T1 4 in 1
C 1 U1 DT8211

© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 4 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

9. Test data
ADIM & BDIM Max Output Current Waveform
VIN = 12V, VBDIM = 4.5V, VADIM = 3.3V, unless otherwise specified.

J2 Output Current = 7.82mArms J3 Output Current = 7.78mArms

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J4 Output Current = 7.69mArms J5 Output Current = 7.60mArms

© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 5 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

9. Test data
ADIM MIN Output Current Waveform
VIN = 12V, VBDIM = 4.5V, VADIM = 0V, unless otherwise specified.

J2 Output Current = 3.88mArms J3 Output Current = 3.79mArm

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J4 Output Current = 3.60mArms J5 Output Current = 3.41mArms

© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 6 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

9. Test data
BDIM Min Output Current Waveform
VIN = 12V, VBDIM = 0V, VADIM = 3.3V, unless otherwise specified.

J2 Output Current = 3.22mArms J3 Output Current = 3.21mArms

Burst Frequency = 297.7Hz Burst Frequency = 296.8Hz

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J4 Output Current = 3.24mArms J5 Output Current = 3.23mArms

Burst Frequency = 298.2Hz Burst Frequency = 296.6Hz

© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 7 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

9. Test data
Output Voltage Waveform
VIN = 12V, VBDIM = 4.5V, VADIM = 3.3V, unless otherwise specified.

J2 Output Voltage = 688Vrms J3 Output Voltage = 675Vrms

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J4 Output Voltage = 687Vrms J5 Output Voltage = 684Vrms

© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 8 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

9. Test data
Hout & Lout Waveforms
VIN = 12V, VBDIM = 4.5V, VADIM = 3.3V, unless otherwise specified.

Cyan Waveform = U1.17 Hout Waveform Blue Waveform = U1.16 Lout Waveform
Blue Waveform = U1.16 Lout Waveform Green Waveform = Current Waveform

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© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 9 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

9. Test data
Open Lamp Protection (OLP) Waveform
VIN = 12V, VBDIM = 4.5V, VADIM = 3.3V, unless otherwise specified.

J2 Str. Voltage = 1.76kVrms J3 Str. Voltage = 1.84kVrms

OLP Time = 1.44sec OLP Time = 1.43sec

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J4 Str. Voltage = 1.91kVrms J5 Str. Voltage = 1.76kVrms

OLP Time = 1.43sec OLP Time = 1.43sec

© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 10 of 11
 DMB Technology DT8211 Application
4 Lamps Inverter Application Datasheet using DT8211

9. Test data
Components Temperature
TA = 25°C, VIN = 12V, unless otherwise specified.

Condition Reference Number Components Temperature

U1 DT8211 45.4℃

BDIM=4.5V, Q1, Q2 MOSFET(STM8319) 60.1℃, 65.8℃

ADIM=3.3V T1 Transformer 54℃
C5 Electronics Capacitor 45.7℃

10. Important notices

n This document can be added or changed without notice. Before considering use
or application, you’d better consult the D.M.B Technology Co., Ltd.
n No part of this publication may be reproduced or transmitted or copied in any
form or by any means without permission of D.M.B Technology.
n Although our design has internal protective circuit, you’d better adopt safety
circuits or measures externally to prevent undesired probabilistic device failure.

11. Contact information

For technical information wshan@dmbtech.com
For sales information sales@dmbtech.com
For additional information http://www.dmbtech.com

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© 2008 DMB Tech. All Rights Reserved

Application Circuit Rev1.0 – 18 April 2008 11 of 11