MT7202 datasheet(1/1 Pages) MAXIC

номер детали	MT7202

подробное описание детали	1.5A LED driver with internal switch

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производитель	MAXIC [Maxic Technology Corporation]

домашняя страница	http://www.maxictech.com/

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MT7202

1.5A LED driver with internal switch

Email: sales@maxictech.com

www.maxictech.com

Rev. 1.05

Tel: 86-10-62662828

Page 1

DESCRIPTION

The MT7202 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~50V and provides an

externally adjustable output current of up to

1.5A.

The MT7202 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 'ADJ' pin.

The ADJ pin will accept either a DC voltage or

a PWM waveform. Depending upon the control

frequency, this will provide either a continuous

or a gated output current. The PWM filter

components are contained within the chip.

The PWM filter provides a soft-start feature by

controlling the rise of input/output current. The

soft-start time can be increased using an

external capacitor from the ADJ pin to ground.

Applying a voltage of 0.2V or lower to the ADJ

pin turns the output off and switches the

device into a low current standby state.

APPLICATION CIRCUIT

FEATURES



Simple low parts count



1.5A output current



Single pin on/off and brightness control

using DC voltage or PWM



Internal PWM filter



Unique frequency Jitter technique to

reduce EMI



High efficiency (up to 97%)



Wide input voltage range: 6V to 50V



Output shutdown



Up to 1MHz switching frequency



Inherent open-circuit LED protection



High accuracy output current ±3%



Available in SOT89-5 packages

APPLICATION



Low voltage halogen replacement LEDs



Automotive lighting



Low voltage industrial lighting



LED back-up lighting



Illuminated signs



Stage lights

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