OB3318 CCFL Inverter - DALINCOMdalincom.ru/datasheet/sample_inverter_test.pdf · OB3318 Demo Board Manual © On-Bright Electronics Confidential OB_DOC_DBM_18A0 - 3 - Board Information

OB3318 Demo Board Manual

© On-Bright Electronics Confidential OB_DOC_DBM_18A0

- 1 -

OB3318 CCFL Inverter Introduction Manual

On-Bright Confidential to Bona Fide (贝

纳化电)

http://dalincom.ru



- 2 -

Contents Section1: Board Information (page3 to page7) Page3: System function check list & test spec Page4: Test setup & equipments list Page5: System schematic Page6: Bill of material Page7: PCB gerber file Section2: Test report (page8 to page26) Page8: System striking frequency & striking voltage Page9: Striking process control and striking timer Page10: Normal operating frequency & voltage Page11: Soft start time Page12: Soft on/off time Page13: Internal burst mode dimming control (1: Max. brightness) Page14: Internal burst mode dimming control (2: Medium brightness) Page15: Internal burst mode dimming control (3: Min. brightness) Page16: Internal analog mode dimming control (1: Max. brightness) Page17: Internal analog mode dimming control (2: Medium brightness) Page18: Internal analog mode dimming control (3: Min. brightness) Page19: External LPWM mode dimming control (1: 80% brightness) Page20: External LPWM mode dimming control (2: 20% brightness) Page21: MOSFET VGS & Transformer primary terminal waveform Page22: System power voltage ripple (continues mode & burst mode dimming) Page23: System inrush current (continues mode & burst mode dimming) Page24: Open lamp protection in normal operating condition Page25: Output current wave crest factor Page26: System efficiency


纳化电)



- 3 -

Board Information 1. System function check list: No. Item Check list

A Inf.

Main control IC: OB3318 Half bridge

Dimming mode: Burst mode, analog mode, external LPWM mode

Lamp quantity: 100K dummy load X1

Input voltage: typical 12V

Operation frequency: 48KHz~52KHz

Burst frequency: 195Hz~205Hz

Turns ratio: 20:2485

Endure voltage: 1500V rms 60sec

Secondary DCR: 770ohm+15%

Secondary leakage inductor: 200mH+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 (1000V)? 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. (1A)? OK

Operating range of VGS less than 90%of Spec. (+25V)? OK E Switching

Operating range of VDS less than 90%of Spec. (+30V)? OK

F Balance Current difference less than 1mA? none

G Efficiency Higher than 80%? 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

2. Test spec: Item VIN DIM ENA IIN IOUT Freq Remark

1 12V 3V 5V <100mA - - Open lamp test: inverter shutdown

2 12V 3V 5V <2A 6-7mA 48-52KHz IOUT (max) & Operating frequency test

3 12V 0V 5V <800mA 0.5-1.5mA 195-205Hz IOUT (min) & burst frequency test

4 12V 3V 0.5V <100mA 0 - On/off test: inverter shutdown


纳化电)



- 4 -

3. Test setup & equipments:

Item Test equipment Model Vendor

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

② Oscilloscope Wave Surfer 424 LeCrow

③ Current Amplifier TCP 300 Tektronix

④ High Voltage Probe P6015A 1000X Tektronix

⑤ Multimeter 45 FLUKE

12V 0~3V 5V

GND

ENA

DIM

Vin+

HV

RTN

LOA

D

100

Koh

m

Inverter System board

1Kohm Multimeter

① ② ③

④

⑤

Oscilloscope

Current Amplifier

DC Power Supply


纳化电)



- 5 -

4. System Schematic:

VIN

1

VIN

2

GND

3

GND

4

DIM

5

ENA

6

CN1

Q1 2N39

04

ZD1

5.6V

R4

10R3 10

K

C5

2.2u

F

C4

1uF

C3

39nF

C2 10nF

C8 10nF

C7 10nF

C6 100n

F

F11A

R5 82K

R6 10K

R1 10K

R7 110K

R8

33K

C9 47nF

R2

10K

C10

2.2u

F1,

2,3

4,5,

689

LH

CN

20

C17

100n

F

BA

V99

D2

VS

R12

1MC

1610

0nF

R10

33R9

33

R11

10K

CP

2O

pen

CP

1O

pen

5V

5V

R14

51K

R13

430

ENA

1S

VD

16

DIM

15

BF/D

MO

D14

AG

ND

13

RT12

RI11

PG

ND

10

N-GA

TE

9P-

GAT

E8

VDD

A7

VS6

STIM

E5

NC4

CS3

CM

P/S

ST2

U1 OB

3318

C1 22uF

T1

20:2

485

VIN

VIN

S1 1

G1 2S2 3

G2 4D25

D26

D17

D18

U2 AO46

06

ZD2

5.6V

P-G

ATE

BAV9

9D1

P-G

ATE

VS

C11

2.2u

F

N-G

ATE

N-GA

TE

C12

NC

C13

100p

F 3K

V

C14

15pF

3KV

C15

15nF

VIN

: 12V

Typ

ical

D

IM: 3

V, M

ax. B

right

ness

; 0V,

Min

. Brig

htne

ss

EN

A: D

isab

le, 0

-0.8

V; E

nabl

e, 2

-5V

LO

AD

: 100

Kohm

Dum

my

Load


纳化电)



- 6 -

5. Bill of material: Parts Designator QTY Cost IC OB3318/SOP16 U1 1 AO4606(N+P MOSFET) U2 1 Capacitors 22uF/25V/1812 C1 1 10nF/25V/0805 C2,C7,C8 3 39nF/25V/0805 C3 1 1uF/25V/0805 C4 1 2.2uF/50V/0805 C5,C10,C11 3 100nF/25V/0805 C6,C16,C17 3 47nF/25V/0805 C9 1 NC C12 0 100pF/3KV/1808 C13 1 15pF/3KV/1808 C14 1 15nF/50V/0805 C15 1 Resistors 10K/1206 R1 1 10K/0805 R2,R3,R6,R11 4 10ohm/0805 R4 1 62K/0805 R5 1 110K/1%/0805 R7 1 33K/1%/0805 R8 1 33ohm/0805 R9,R10 2 1M/0805 R12 1 430ohm/1%/0805 R13 1 51K/0805 R14 1 Other 5.6V Zener Diode ZD1,ZD2 2 BAV99 Dual Diode D1,D2 2 1A Fuse/1206 F1 1 UI9.8 Transformer T1 1 2N3904/SOT23 Q1 1 6PIN Connector CN1 1 2PIN HV Connector CN2 1 PCB OB3318 DEMO BOARD B2 1


纳化电)



- 7 -

6. PCB Gerber File: Top layer:

Bottom layer:

Top overlay:


纳化电)



- 8 -

Test Report 1. System striking frequency & striking voltage

CH1: Gate1 Striking frequency: 68.1KHz CH2: None CH3: Output voltage Striking voltage: 1.242KV CH4: Output current *Start with lamp open then check output voltage


纳化电)



- 9 -

2. Striking process control and striking timer

CH1: Gate1 Striking time approximately is 1.3S CH2: VS Regulated to 3.08V CH3: Striking voltage CH4: STIME Shutdown when STIME voltage rises to 2.72V threshold *Start with lamp open then check output voltage and it’s maintain time


纳化电)



- 10 -

3. Normal operating frequency & voltage

CH1: Gate1 Normal operating frequency: 51.9KHz CH2: None CH3: Output voltage CH4: Output current


纳化电)



- 11 -

4. Soft start time

CH1: Gate1 CH2: CMP Soft start time: 10.0mS CH3: CS CH4: Output current *Soft start function can reduces the inrush current and avoids unnecessary stresses with other inverter components and CCFL lamp.


纳化电)



- 12 -

5. Soft on/off time

CH1: Gate1 CH2: CMP Soft on time:536.7uS, Soft off time: 611.9uS CH3: CS CH4: Output current


纳化电)



- 13 -

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

CH1: None CH2: BF Burst frequency: 196.8Hz CH3: DIM DIM=3.154V CH4: Output current Output current: 6.82Ma *Test with CP1 and CP2 open


纳化电)



- 14 -

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

CH1: None CH2: BF Burst frequency: 196.7Hz CH3: DIM DIM=1.577V CH4: Output current Output current: 4.82Ma *Test with CP1 and CP2 open


纳化电)



- 15 -

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

CH1: None CH2: BF Burst frequency: 196.2Hz CH3: DIM DIM=0V CH4: Output current Output current: 1.54Ma *Test with CP1 and CP2 open


纳化电)



- 16 -

7. Internal analog mode dimming control (1: Max. brightness)

CH1: None CH2: BF Set to high (>3.5V) CH3: DIM DIM=3.01V CH4: Output current Output current: 6.82Ma *Test with CP1 short and CP2 open


纳化电)



- 17 -

7. Internal analog mode dimming control (2: Medium brightness)

CH1: None CH2: BF Set to high (>3.5V) CH3: DIM DIM=1.509V CH4: Output current Output current: 4.87Ma *Test with CP1 short and CP2 open


纳化电)



- 18 -

7. Internal analog mode dimming control (3: Min. brightness)

CH1: None CH2: BF Set to high (>3.5V) CH3: DIM DIM=0V CH4: Output current Output current: 2.95Ma *Test with CP1 short and CP2 open


纳化电)



- 19 -

8. External LPWM mode dimming control (1: 80% brightness)

CH1: None CH2: BF Set to low (<0.5V) CH3: DIM LPWM frequency: 200Hz, duty:80% CH4: Output current Output current: 5.89Ma *Test with CP1 open and CP2 short


纳化电)



- 20 -

8. External LPWM mode dimming control (2: 20% brightness)

CH1: None CH2: BF Set to low (<0.5V) CH3: DIM LPWM frequency: 200Hz, duty:20% CH4: Output current Output current: 2.66Ma *Test with CP1 open and CP2 short


纳化电)



- 21 -

9. MOSFET VGS & Transformer primary terminal waveform

CH1: N-GATE CH2: P-GATE CH3: Transformer primary terminal A V_ds1 voltage: 15.0V (pk-pk) CH4: Transformer primary terminal B Ma: Transformer primary voltage waveform *Check VDS voltage, make sure that it’s less than 60% of MOSFET Spec.


纳化电)



- 22 -

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

CH1: VIN System power voltage ripple: 234mV(continues mode) & 238mV(burst mode) CH2: None CH3: None CH4: None


纳化电)



- 23 -

11. System inrush current (continues mode & burst mode dimming)

CH1: None CH2: None CH3: None CH4: System input current None inrush current issue


纳化电)



- 24 -

12. Open lamp protection in normal operating condition.

CH1: N-GATE Protection delay time: 21.1mS CH2: CMP CH3: CS *In normal operation condition, suddenly move out lamp, the inverter should shutdown within 20ms


纳化电)



- 25 -

13. Output current wave crest factor

CH1: None CH2: None CH3: None CH4: Output current wave Ioutput_rms: 6.70mA, Ioutput_pk-pk: 20mA

Crest factor: 49.1=70.6•2

20=

sIoutput_rm•2pk-Ioutput_pk

mAmA

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


纳化电)



- 26 -

14. System efficiency Test in max brightness condition (DIM>3.0V). Output current: 6.57mA, Load impedance: 99Kohm, output power: 4.273W Input voltage: 12.1V, input current: 0.40A, input power rate: 4.84W System efficiency:4.273/4.84=88.3%


纳化电)

Documents

OB3318 CCFL Inverter - DALINCOMdalincom.ru/datasheet/sample_inverter_test.pdf · OB3318 Demo Board Manual © On-Bright Electronics Confidential OB_DOC_DBM_18A0 - 3 - Board Information