AIC1647 Ver la hoja de datos (PDF) - Analog Intergrations

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AIC1647

White LED Step-Up Converter in SOT23

Analog Intergrations 

AIC1647

BLOCK DIAGRAM

VIN

95mV

VREF

PWM/PFM

Control

Error

FB

+ AMP.

-

+

Control

Driver

M1

Logic

-

PWM

RC Comparator

Internal

Soft Start

CC

Slope

1.2MHz

Compensation Oscillator

Current AMP

+

RS

-

SHDN

SW

GND

PIN DESCRIPTIONS

PIN 1: SW

PIN 2: GND

- Switch

Pin.

Connect

inductor/diode here. Minimize

trace area at this pin to reduce

EMI.

- Ground Pin. Tie directly to local

ground plane.

PIN 3: FB

- Feedback Pin. Reference

voltage is 95mV. Connect

cathode of lowest LED and

resistor here. Calculate resistor

value according to the formula:

RFB = 95mV/ILED

PIN 4: SHDN - Shutdown pin. Tie to higher than

1.5V to enable device, 0.3V or

less to disable device.

PIN 5: VIN

- Power input pin. Bypass VIN to

GND with a capacitor sitting as

close to VIN as possible.

7

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