Block Diagram

2

Pin Configuration & Marking Information

Top View

SOT23 5

-

EE: Product Code

of PAM2804

X:

Internal Code

Y:

Year

W: Week

,

Power Analog Microelectronics Inc

www.poweranalog.com

PAM2804

1A Step-Down Constant Current, High Efficiency LED Driver

Nam e

Func tion

VIN

Chip main power supply pin

GND

Ground

EN

Enable cont rol input. Force this pin voltage above 1. 5V, enables the chip, and below

0.3V shuts down the device.

FB

Feedbac k voltage to intern al error amplifier, the threshold voltage is 0.1V.

SW

The drains of t he int ernal main and s ynchronous p ower MOSFET.

1

2

3

5

4

EN

GND

SW

FB

VIN

Pin Description

EN

FB

+

-

IAMP

+

-

IRCMP

SW

GND

SYNCHRONOUS

RECTIFIER NCH

(

)

MAIN

SWITCH PCH

(

)

VIN

COMP

VIN

SHUTDOWN

OSC

RS LATCH

0.6VREF

FREQ

SHIFT

-

+

EA

S Q

R Q

SWITCHING

LOGIC

AND

BLANKING

CIRCUIT

SLOPE

COMP

1.5M

OSC

ANTI

SHOOT

THRU

-

-

10/2010 Rev1.0