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HV9910B

Supertex
Part Number HV9910B
Manufacturer Supertex
Description Universal High Brightness LED Driver
Published Jan 12, 2009
Detailed Description HV9910B Universal High Brightness LED Driver Features ► Switch mode controller for single switch LED drivers ► Enhanced ...
Datasheet PDF File HV9910B PDF File

HV9910B
HV9910B

Overview
HV9910B Universal High Brightness LED Driver Features ► Switch mode controller for single switch LED drivers ► Enhanced drop-in replacement to the HV9910 ► Open loop peak current controller ► Internal 8.
0 to 450V linear regulator ► Constant frequency or constant off-time operation www.
DataSheet4U.
com ► Linear and PWM dimming capability ► Requires few external components for operation General Description The HV9910B is an open loop, current mode, control LED driver IC.
The HV9910B can be programmed to operate in either a constant frequency or constant off-time mode.
It includes an 8.
0 - 450V linear regulator which allows it to work from a wide range of input voltages without the need for an external low voltage supply.
The HV9910B 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 HV9910B is ideally suited for buck LED drivers.
Since the HV9910B 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 HV9910B 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.
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 Chargers Typical Application Circuit CIN D1 CDD VDD L1 VIN CO HV9910B LD PWMD RT GATE CS GND RCS Q1 RT HV9910B Ordering Information Package Options Device HV9910B 8-Lead SOIC HV9910BLG-G 16-Lead SOIC HV9910BNG-G VIN 1 NC 2 NC 3 CS 4 VIN 1 CS 2 GND 3 GATE 4 8 7 6 5 RT LD VDD PWMD GND...


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