Diodes PAM2861 - Manual

PAM2861
Document number: DSxxxxx Rev. 1 - 1
1 of 12
www.diodes.com
July 2013
© Diodes Incorporated
PAM2861
A Product Line of
Diodes Incorporated
1A LED DRIVER WITH INTERNAL SWITCH
Description
The PAM2861 is a continuous mode inductive step-down converter,
designed for driving single or multiple series connected LEDs
efficiently from a voltage source higher than the LED voltage. The
device operates from an input supply between 6V and 40V and
provides an externally adjustable output current of up to 1A.
Depending upon supply voltage and external components, this can
provide up to 30 watts of output power.
The PAM2861 includes the output switch and a high-side output
current sensing circuit, which uses an external resistor to set the
nominal average output current.
Output current can be adjusted below the set value, by applying an
external control signal to the VSET pin.
The VSET pin will accept either a DC voltage or a PWM waveform.
The soft-start time can be increased using an external capacitor from
the VSET pin to ground. Applying a voltage of 0.2V or lower to the
VSET pin turns the output off and switches the device into a low
current standby state.
Features
 Simple Low Parts Count

Internal 40V NDMOS Switch
 1A
Output Current
 Single Pin On/Off and Brightness Control Using DC Voltage or
PWM
 Soft-Start

High Efficiency (up to 97%)
 Wide Input Voltage Range: 6V to 40V
 Output
Shutdown

Open LED Protection
 Short LED Protection
 Up to 1MHz Switching Frequency

Inherent Open-Circuit LED Protection
 Typical 5% Output Current Accuracy
 Pb-free TSOT25 and SOT89-5 Packages
Pin Assignments
Applications

Low voltage halogen replacement LEDs

Low voltage industrial lighting
 LED back-side lighting
 Illuminated signs
Top View
TSOT25