BD9202EFS Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BD9202EFS

White backlight LED drivers

ROHM Semiconductor 

BD9202EFS

Technical Note

●Operating condition (Ta=25℃)

Parameter

Symbol

Voltage range

Unit

Power supply voltage

VREG

5.25～5.5

V

CPUVDD

2.7～5.5

V

CT oscillation frequency setting range

fCT

300～800

kHz

CT_SYNC_IN input frequency range *4*5 FCT_SYNC_IN

fCT～800

kHz

BCT oscillation frequency setting range

fBCT

100～1000

kHz

BCT_SYNC_IN input frequency range *4*5 FBCT_SYNC_I

fBCT～1000

kHz

VSET Input potential

VSET

0.9～2.4

V

*4 When not using external frequency input, please connect the terminal of CT_SYNC_IN, BCT_SYNC_IN to GND.

*5When using external frequency input, please do not do the operation that is changed to internal oscillation

frequency on midway.

● Electric characteristic

（(Unless otherwise specified Ta=25℃，VCC=24V，VREG=5V,

Parameter

【All the circuit electric currents】

Symbol

Min

CPUVDD=3V）

Limit

Typ Max

Circuit electric currents

Icc

6

13

21

Stand-by electric current

【VREG section】

VREG Output voltage

IST

VREG

VREG VREG sink electric current

IREG

VREF Output voltage

【Switching section】

SWOUT Source value of resistance

SWOUT Sink value of resistance

【OCP section】

Over-current protective operating

voltage

【Error amplifier section】

LED Control voltage

COMP Sink electric current

COMP Source electric current

【CT Oscillator section】

CT Oscillation frequency

CT_SYNC_IN input High voltage

VREF

RONH

RONL

VOLIMIT

VLED

ICOMPSINK

ICOMPSOURCE

FCT

VSYNC_INH

CT_SYNC_IN input low voltage

VSYNC_INL

CT_SYNC_OUT output high voltage

CT_SYNC_OUT output low voltage

【BCT Oscillator section】

BCT Oscillation frequency

BCT_SYNC_IN input High voltage

VSYNC_OUTH

VSYNC_OUTL

FBCT

VBSYNC_INH

BCT_SYNC_IN input low voltage

VBSYNC_INL

BCT_SYNC_OUT output high voltage

BCT_SYNC_OUT output low voltage

【OVP section】

Over-voltage detection reference voltage

OVP Hysteresis voltage

【UVLO section】

UVLO (VREG) Detection voltage

UVLO (VREG) Hysteresis voltage

UVLO(EXT) Detection voltage

UVLO(EXT) Hysteresis voltage

VBSYNC_OUTH

VBSYNC_OUTL

VOVP

VOVPHYS

VUVLO_VREG

VUHYS_VREG

VUVLO_EXT

VUHYS_EXT

-

4.8

5

1.57

-

-

0.1

0.55

40

-200

500

VREG

×0.7

-0.3

VREG

-1.0

-

500

VREG

×0.7

-0.3

VREG

-1.0

-

1.85

0.4

2.6

50

1.7

50

0

5

12

1.60

7

2

0.2

0.75

100

-100

600

-

-

VREG

–0.15

0.1

600

-

-

VREG

–0.15

0.1

2.0

0.5

2.9

100

1.9

100

10

5.2

20

1.63

-

-

0.3

0.95

200

-40

700

VREG

+0.3

VREG

×0.3

-

0.5

700

VREG

+0.3

VREG

×0.3

-

0.5

2.15

0.6

3.2

200

2.1

200

Unit

mA

uA

V

mA

V

Ω

Ω

V

V

uA

uA

kHz

V

V

V

V

kHz

V

V

V

V

V

V

V

mV

V

mV

Condition

VCC=24V

CPUVDD=3V, EN=3V

LED1～8=OFF

EN=0V

Io=0mA,CREG=2.2uF

At the time of external impressing of

VREG=5.25VAt

LED1～8=OFF,EN=3V

Io=0uA

ION=-10mA

ION=10mA

Vcs=Sweep up

VLED=2V,Vcomp=1V

VLED=0V,Vcomp=1V

RT=51kΩ

IOL=-1mA

IOL=1mA

BRT=51kΩ

IOL=-1mA

IOL=1mA

VOVP=Sweep up

VOVP=Sweep down

VREG=Sweep down

VREG=Sweep up

UVLO=sweep down

UVLO=sweep up

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© 2009 ROHM Co., Ltd. All rights reserved.

2/19

2009.04 - Rev.A

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