ADD5203 Ver la hoja de datos (PDF) - Analog Devices

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ADD5203

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

Analog Devices 

ADD5203

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

SUPPLY

Input Voltage Range

BOOST OUTPUT

Output Voltage

SWITCH

On Resistance

Leakage Current

Peak Current Limit

OSCILLATOR

Switching Frequency

Maximum Duty Cycle

SOFT START

Soft Start Time

OVERVOLTAGE PROTECTION

Overvoltage Rising Threshold on OVP Pin

Overvoltage Falling Threshold on OVP Pin

Symbol

VIN

VOUT

RDS(ON)

ILKG

ICL

fSW

fSW

DMAX

tSS

VOVPR

VOVPF

Test Conditions

VIN = 12 V, ISW = 100 mA

Duty cycle (D) = DMAX

RF = 150 kΩ

RF = 470 kΩ

RF = 470 kΩ

Min Typ

6

150

44

2.9

800 1000

350

85

92

1.5

1.154 1.20

1.050 1.12

Max Unit

21

V

45

V

210 mΩ

70

μA

A

1200 kHz

kHz

%

ms

1.267 V

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

CURRENT SOURCE

ISET Pin Voltage

Adjustable LED Current1

Constant Current Sink of 20 mA2

Minimum Headroom Voltage2

Current Matching Between Strings2

LED Current Accuracy2

Current Source Leakage Current

FPWM GENERATOR

Dimming Frequency Range

Dimming Frequency

LED FAULT DETECTION

Open Fault Delay1

Symbol

VSET

ILED

ILED20

VHR20

Test Conditions

6 V ≤ VIN ≤ 21 V

RSET = 141.56 kΩ

RSET = 141.56 kΩ

RSET = 141.56 kΩ

RSET = 141.56 kΩ

fPWM

TD_OPENFAULT

6 V ≤ VIN ≤ 21 V

RFPWM = 50 kΩ, CFPWM = 150 pF

Min Typ Max

Unit

1.16 1.2

1.24

V

0

30

mA

19.4 20

20.6

mA

0.65 0.85

V

−1.5

+1.5

%

−3

+3

%

1

μA

200

10,000 Hz

820 1000 1180 Hz

6.5

μs

1 These electrical specifications are guaranteed by design.

2 Tested at TA = +25°C.

Rev. 0 | Page 4 of 24

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