ADD5207 Ver la hoja de datos (PDF) - Analog Devices

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componentes Descripción

Fabricante

ADD5207

Four-String, White LED Driver for LCD Backlight Applications

Analog Devices 

Data Sheet

ADD5207

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

LED FAULT DETECTION

Open Fault Delay1

Symbol

VSET

ILED

ILED20

VHR20

Test Conditions/Comments

6 V ≤ VIN ≤ 21 V

RSET = 180 kΩ

RSET = 180 kΩ

RSET = 180 kΩ

RSET = 180 kΩ

fPWM

tD_OPENFAULT

Min Typ Max

Unit

1.14 1.18 1.22

V

0

25

mA

19.4 20

20.6

mA

0.66 0.9

V

−1.5

+1.5

%

−3

+3

%

1

µA

6.8 8.0

9.2

kHz

6.5

µs

1 This electrical specification is guaranteed by design.

2 Tested at TA = +25°C.

Rev. A | Page 5 of 16

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