L5100-AF5-R Просмотр технического описания (PDF) - Unisonic Technologies

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производитель

L5100-AF5-R

WHITE LED STEP-UP CONVERTER

Unisonic Technologies 

L5100

LINEAR INTEGRATED CIRCUIT

PIN DESCRIPTION

PIN NO.

SOT-25 SOT-363

1

1

2

2/5

3

3

4

4

5

6

PIN NAME SYMBOL

FUNCTION

Switch

Ground

Feedback

Shutdown

Input Supply

SW

GND

FB

SHDN

VIN

Connect inductor/diode here. Minimize trace area at this pin to

reduce EMI.

Connect directly to local ground plane.

Reference voltage is 95mV. Connect cathode of lowest LED and

resistor here. Calculate resistor value according to the formula:

RFB = 95mV/ILED

Connect to 1.5V or higher to enable device; 0.4V or less to disable

device.

Input Supply Pin. Must be locally bypassed.

BLOCK DIAGRAM

VIN

Pin 5 (SOT-25)

Pin 6 (SOT-363 ) 5

VREF

1.25V

FB

SW

3

1

-

95mV + A1

-

Rc

+ A2

Cc

RSQ

DRIVER

Q1

Σ

RAMP

1 .2MHz

GENERATOR

TIME CONTROL

SHUTDOWN

SHDN 4

Slope compensation

+

0 .2Ω

-

2 GND

Pin 2 /5 (SOT-363 )

Pin 2 (SOT-25 )

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

2

QW-R103-024,A

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