ZLED7020

High Current 40V LED Driver with Internal Switch

© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.2

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The information furnished in this publication is subject to changes without notice.

Brief Description

The ZLED7x20 continuous-mode inductive step-

down converter family is part of our line of LED-

control ICs. It is designed for applications requiring

high brightness and high current. It can efficiently

drive a single LED or multiple series-connected

LEDs from a voltage input higher than the LED for-

ward voltage: Vin = 6 to 40 VDC. It provides an

adjustable output current

≤1.2A, which is set via an

external resistor and controlled by the ZLED7x20’s

integrated high-side output current-sensing circuit

and high speed internal 40V power switch. An

external control signal, which can be a DC voltage,

PWM, or microcontroller-generated waveform, on

the ADJ pin can also be used to linearly adjust a

continuous output current or to control a gated out-

put current.

The output can be turned off by applying a voltage

lower than 0.2V to the ADJ pin, which puts the

ZLED7x20 in a low-current standby state.

The ZLED7x20 enables diverse industrial and

consumer

lighting

applications

requiring

high

driving currents, wide operating voltage range,

high efficiency, and variable brightness control. It

offers over-temperature and LED open-circuit pro-

tection. The ZLED7x20 can also minimize bill-of-

material costs because very few external com-

ponents are required for most applications. Only a

resistor, a diode, an inductor, and three capacitors

are needed for a typical basic application.

ZLED7x20 Typical Application Circuit

Features

Benefits

voltage or PWM

operation

on the application.

Available Support

Physical Characteristics

ZLED7x20 Family Selection Matrix

Product

Max. Current Output

Package

ZLED7020

1.2A

SOT89-5

ZLED7320

1.0A

DFN-5

ZLED7520

0.75A

DFN-5

ZLED7720

0.35A

DFN-5

For additional information on our ZLED driver

family, visit www.zmdi.com/products/led-drivers/