ADD5203 datasheet(4/24 Pages) AD

No. de pieza	ADD5203

Descripción Electrónicos	8-String,White LED Driver with SMBus and PWM Input for LCD Backlight Applications

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Fabricante Electrónico	AD [Analog Devices]

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ADD5203

Rev. 0 | Page 4 of 24

SPECIFICATIONS

STEP-UP SWITCHING REGULATOR SPECIFICATIONS

VIN = 12 V, SHDN = high, TA = −25°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.

Table 1.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

SUPPLY

Input Voltage Range

VIN

6

21

V

BOOST OUTPUT

Output Voltage

VOUT

45

V

SWITCH

On Resistance

RDS(ON)

VIN = 12 V, ISW = 100 mA

150

210

mΩ

Leakage Current

ILKG

44

70

μA

Peak Current Limit

ICL

Duty cycle (D) = DMAX

2.9

A

OSCILLATOR

Switching Frequency

fSW

RF = 150 kΩ

800

1000

1200

kHz

fSW

RF = 470 kΩ

350

kHz

Maximum Duty Cycle

DMAX

RF = 470 kΩ

85

92

%

SOFT START

Soft Start Time

tSS

1.5

ms

OVERVOLTAGE PROTECTION

Overvoltage Rising Threshold on OVP Pin

VOVPR

1.154

1.20

1.267

V

Overvoltage Falling Threshold on OVP Pin

VOVPF

1.050

1.12

1.188

V

LED CURRENT REGULATION SPECIFICATIONS

VIN = 12 V, SHDN = high, TA = −25°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.

Table 2.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

CURRENT SOURCE

ISET Pin Voltage

VSET

6 V ≤ VIN ≤ 21 V

1.16

1.2

1.24

V

Adjustable LED Current1

ILED

0

30

mA

Constant Current Sink of 20 mA2

ILED20

RSET = 141.56 kΩ

19.4

20

20.6

mA

Minimum Headroom Voltage2

VHR20

RSET = 141.56 kΩ

0.65

0.85

V

Current Matching Between Strings2

RSET = 141.56 kΩ

−1.5

+1.5

%

LED Current Accuracy2

RSET = 141.56 kΩ

−3

+3

%

Current Source Leakage Current

1

μA

FPWM GENERATOR

Dimming Frequency Range

6 V ≤ VIN ≤ 21 V

200

10,000

Hz

Dimming Frequency

fPWM

RFPWM = 50 kΩ, CFPWM = 150 pF

820

1000

1180

Hz

LED FAULT DETECTION

Open Fault Delay1

TD_OPENFAULT

6.5

μs

1 These electrical specifications are guaranteed by design.

2 Tested at TA = +25°C.

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