AAT3122 데이터 시트보기 (PDF) - Analog Technology Inc

부품명

상세내역

제조사

AAT3122

High Efficiency 1X/1.5X Fractional Charge Pump for White LED Applications

Analog Technology Inc 

AAT3122

High Efficiency 1X/1.5X Fractional Charge

Pump for White LED Applications

Additional Application Circuit

VBATTERY

VIN

C1+

C1

1µF

VOUT

C1-

C2+

CIN

1µF

COUT

1µF

AAT3122

C2

1µF

C2-

D1

D2

D3

D4

D5

D6

D1

RB*

RB*

RB*

RB*

RB*

RB*

EN/SET

EN/SET

GND

*In some applications, white LED forward voltages (VF) can vary significantly. Ballast resistors between the LED cathodes and ground are

recommended for balancing the forward voltage differences. The ballast resistor value may be approxiamted by the following equation:

RB

=

(VIN(MIN))1.5 - (VF(MAX)

IF(MAX)

+

250mV)

VF(MAX) = Maximum expected LED forward voltage at the given maximum forward current level. Refer to the LED manufacturers’

datasheet for maximum VF specifications.

IF(MAX) = Maximum forward current used to drive an individual LED.

VIN(MIN) = Minimum input supply voltage for the application.

RB = Ballast resistor value in ohms.

3122.2005.11.1.3

11

Share Link: