Datasheet > PAM2803SHDNAF095

PAM2803SHDNAF095

更新时间： 2025-09-01 06:02:35

品牌	Logo	应用领域
PAM		驱动器
页数	文件大小	规格书
8页	207K
描述
3W High Power White LED Driver

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PAM2803SHDNAF095 数据手册

PAM2803

3W High Power White LED Driver

Features

General Description

LED Power Efficiency: up to 90%

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

@V_F=3.7V)

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

delivers a regulated output current. The device

switches at

a 1.0MHz constant frequency,

allowing for the use of small value external

inductor and ceramic capacitors.

Low Start-Up Voltage: 0.9V(I_LED=270mA)

Low Hold Voltage:0.75V(I_LED=200mA)

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

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, 100mꢀ

NMOS switch, the device can provide high

efficiency even at 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.

Applications

White LED Torch (Flashlight)

White LED Camera Flash

DSC(Digital Still Camera)Flash

Cellular Camera Phone Flash

PDA Camera Flash

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

package.

Camcorder Torch(Flashlight) Lamp

Typical Application

Block Diagram

VOUT VIN

Comparator

2.2uH

95mV

Reference

PWM Logic

And Driver

VIN

VOUT

C_IN

WLED

PAM2803

SHDN FB

10uF

V_IN

C_O

Ramp

Generator

OFF ON

10uF

R_S

GND

SHDN

Shutdown

And

Soft-start

1.0MHz

Oscillator

GND

I_LED=750mA, R_S=0.127ꢀ

Power Analog Microelectronics,Inc

www.poweranalog.com

08/2007

12 3 4 5 6 7 8

中文翻译

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