Diodes PAM2863 - Manual

PAM2863
Document number: DSxxxxx Rev. 1 - 0
1 of 11
www.diodes.com
October 2012
© Diodes Incorporated
PAM2863
A Product Line of
Diodes Incorporated
2A LED DRIVER with INTERNAL SWITCH
Description
The PAM2863 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 4.5V and 40V and
provides an externally adjustable output current of up to 2A.
Depending upon supply voltage and external components, this can
provide up to 30 watts of output power.
The PAM2863 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
• 2A 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: 4.5V to 40V
• Output Shutdown
• Open LED Protection
• Short LED Protection
• Up to 1MHz Switching Frequency
• Typical 5% Output Current Accuracy
• Pb-Free SOP-8(EP) Packages
Pin Assignments
Applications
• High End LED Flashlight
• LED Light Bar