BD9479FV-XX datasheet(3/29 Pages) ROHM

Part #	BD9479FV-XX

Description	White LED Driver for large LCD Panels (DCDC Converter type)

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Manufacturer	ROHM [Rohm]

Direct Link	http://www.rohm.com

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Datasheet

BD9479FV

TSZ02201-0F1F0C100020-1-2

9.Aug.2012 Rev.001

www.rohm.com

TSZ22111

・

15

・

001

●

Electrical Characteristics (Unless otherwise noted, Ta = 25

oC, VCC=24V)

Parameter

Symbol

Limit

Unit

Condition

Min.

Typ.

Max.

[Whole Device]

Operation current

ICC

－

8.7

14.0

mA

STB=3V, PWM1-8=0V

Standby current

IST

－

12

24

uA

STB=0V

[UVLO Block]

Operation Voltage

（

VCC

）

VUVLO_VCC

6.5

7.5

8.5

V

VCC=SWEEP UP

Hysteresis Voltage

（

VCC

）

VUHYS_VCC

150

300

600

mV

VCC=SWEEP DOWN

Operation Voltage

（

UVLO

）

VUVLO

2.91

3.00

3.09

V

UVLO=SWEEP UP

Hysteresis Voltage

（

UVLO

）

VUHYS

170

210

250

mV

UVLO=SWEEP DOWN

[DC/DC Block]

Error amp Base Voltage

VEAMP

0.55

0.60

0.65

V

BSx pin, VREF=0.9V

Oscillation frequency

FCT

142.5

150.0

157.5

kHz

RT=100kΩ

N pin MAX DUTY output

NMAX_DUT

Y

90

95

99

%

RT=100kΩ

N pin source ON resistor

RNSO

0.5

1

2

Ω

N pin sink ON resistor

RNSI

0.5

1

2

Ω

RT pin Voltage

VRT

1.00

1.50

2.00

V

RT=100kΩ

SS pin source current

ISSSO

-2.4

-2.0

-1.6

uA

Soft start ended Voltage

VSS_ED

3.6

4.0

4.4

V

FB pin source current

IFBSO

-110

-100

-90

uA

FB pin sink current

IFBSI

85

100

115

uA

Over current detect Vlotage

VCS

0.35

0.40

0.45

V

[DC/DC Protection Block]

CP pin source current

ICPSO

-2.4

-2.0

-1.6

uA

CP pin detect Voltage

VCP

2.375

2.500

2.625

V

OVP High detect voltage

VOVPH

2.137

2.250

2.363

V

OVP Feedback Voltage

VOVPFB

2.375

2.500

2.625

V

OVP Low detect Voltage

VOVPL

0.14

0.20

0.30

V

[LED PNP Driver Block]

CL pin current setting Voltage

VRCL

295.5

300.0

304.5

mV

VREF=0.9V

CL pin current setting Voltage

(Analog MAX)

VRCLMAX

-3%

1.0

+3%

V

VREF max=3.0V

CL pin current setting Voltage

(Analog MIN)

VRCLMIN

-3%

200.0

+3%

mV

VREF min=0.6V

PNP Driver output sink resistor

RBS

55

80

120

Ω

PWMx=High, VCL=Low

VREF pin input current

IVREF

-1.0

0.0

1.0

uA

VREF=1V

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