PAM2803SHDNAF095 datasheet(1/8 Pages) PAM

部件名	PAM2803SHDNAF095

功能描述	3W High Power White LED Driver

PDF	8 Pages

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制造商	PAM [Power Analog Micoelectronics]

网页	http://www.poweranalog.com

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Features

LED Power Efficiency: up to 90%

Current Accuracy: 5%(V =3.6V to 1.8V

@V =3.7V)

1MHz Switching Frequency

Uses small, Low Profile External Components

Low RDS(ON) : 100mΩ (TYP.)

Open LED Protection

Over Temperature Protection

Low Profile SOT-23-6 Package

Pb-Free Package

±

IN

F

Low Start-Up Voltage: 0.9V(I

=270mA)

Low Hold Voltage:0.75V(I

=200mA)

White LED Torch (Flashlight)

White LED Camera Flash

DSC(Digital Still Camera)Flash

Cellular Camera Phone Flash

PDA Camera Flash

Camcorder Torch(Flashlight) Lamp

The PAM2803 is a set-up DC-DC converter that

delivers a regulated output current. The device

switches at a 1 .0MHz c onstant frequency,

allowing for the use of small value external

inductor and ceramic capacitors.

The PAM2803 is targeted to be used for driving

loads up to 1A from a two-cell alkaline battery. The

LED current can be programmed by the external

current sense resistor, Rs, connected between the

feedback pin (FB) and ground. A low 95mV

feedback voltage reduces the power loss in the Rs

for better efficiency. With its internal 2A, 100

device can provide high

efficiency e ven a t heavy load. During the

shutdown mode, the feedback resistor Rs and the

load are completely disconnected and the current

consumption is reduced to less than 1uA.

The PAM2803 is available in the 6-lead SOT-23-6

package.

LED

Applications

General Description

mΩ

NMOS switch, the

n

Typical Application

95mV

Reference

+

A1

-

Rc

Cc

-

A2

+

Comparator

VOUT

VIN

SW

PWM Logic

And Driver

+

-

GND

1.0MHz

Oscillator

Shutdown

And

Soft-start

FB

Σ

Ramp

Generator

SHDN

Block Diagram

1

www.poweranalog.com

08/2007

PAM2803

3W High Power White LED Driver

10uF

2.2uH

10uF

OFF ON

R

S

3

2

1

6

5

4

SW

VIN

VOUT

FB

SHDN

GND

WLED

V

IN

C

O

C

IN

3W

PAM2803

I

=750mA, R =0.127

LED

S

Ω

,

Power Analog Microelectronics Inc

类似零件编号 - PAM2803SHDNAF095

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