IRS2980SPBF データシートの表示（PDF） - International Rectifier

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IRS2980SPBF

LED DRIVER CONTROL IC

International Rectifier 

IRS2980S

Description

The IRS2980S utilizes International Rectifier's control and high-voltage technologies to realize a simple,

high-performance Buck LED driver solution. This solution is based on hysteretic output current regulation

typically operating from 25 kHz to 120 kHz. Frequency and duty cycle vary to maintain a tightly regulated

average output current over variations in line and load. Output current ripple will depend on inductor

selection in conjunction with input and output voltages as well as output current and component selection.

The IRS2980S uses a unique floating high side differential current sense and level shift scheme allowing

hysteretic operation with a low side switching MOSFET optimizing size and cost. In addition, the IRS2980S

includes a high voltage regulator able to operate up to 450V eliminating the need for an external VCC supply.

A PWM dimming interface is also included that can be controlled from a 0 to 2V analog or 3.3 or 5V logic

control signal able to operate up to 1kHz offering brightness control from 0 to 100%. A programmable on

board PWM oscillator is used with DC dimming control.

Block Diagram

HV 1

CS 8

VS 2

15.6V

0.5V

Ref

High Side

Well

VCC 3

REGULATOR

UVLO

15.6V

NOISE FILTER +

MAXIMUM

FREQUENCY

TIMING

VCC

2V

0.2V

1V

5 ADIM

6 RAMP

VCC

7 OUT

4 COM

www.irf.com

© 2011 International Rectifier

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