Diodes PAM99700 User Manual download pdf

PAM99700

Document number: DSxxxxx Rev. 1 - 1

1 of 12

www.diodes.com

October 2012

PAM99700

Product Line o

Diodes Incorporated

UNIVERSAL HIGH BRIGHTNESS LED DRIVER

Description

The PAM99700 is an open loop current mode control LED driver IC.

The PAM99700 can be programmed to operate in either a constant

frequency or constant off-time mode. It includes a 12 - 500V regulator

which allows it to work from a wide range of input voltages without the

need for an external low voltage supply. The PAM99700 includes a

PWM dimming input that can accept an external control signal with a

duty ratio of 0 - 100% and a frequency of up to a few kilohertz. It also

includes a 0 - 250mV linear dimming input which can be used for

linear dimming of the LED current.

The PAM99700 is ideally suited for buck LED drivers. Since the

PAM99700 operates in open loop current mode control, the controller

achieves good output current regulation without the need for any loop

compensation. PWM dimming response is limited only by the rate of

rise and fall of the inductor current, enabling very fast rise and fall

times. The PAM99700 requires only three external components (apart

from the power stage) to produce a controlled LED current making it

an ideal solution for low cost LED drivers.

Features

• Switch Mode Controller for Single Switch LED Drivers

• Open Loop Peak Current Controller

• Constant Frequency or Constant Off-Time Operation

• Linear and PWM Dimming Capability

• Requires Few External Components for Operation

• Application From a Few mA to More than 1A Output

Pin Assignments

Applications

• DC/DC or AC/DC LED Driver Applications

• RGB Backlighting LED Driver

• Back Lighting of Flat Panel Displays

• General Purpose Constant Current Source

• Signage and Decorative LED Lighting

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Summary of Contents

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Page 2 - Pin Descriptions

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Page 7 - Application Information

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Page 9 - Marking Information

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Page 11 - PAM99700

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