ZLED7030

High Current 40V LED Driver with Switch Dimming

© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.2

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

Vin

LX

GND

ZLED7x30

D1

LED

String

Vs = 8.5 to 40 VDC

(C3)

Rs

L1

C2

0.1 F

DIM1

DIM2

GND/Floating

GND/Floating

Switch

C1

≥220 F

Brief Description

The ZLED7x30 continuous-mode inductive step-

down converter family is one of our ZLED LED-

control ICs. It is designed for applications requiring

high brightness and high current. The ZLED7x30

can efficiently drive a single LED or multiple

series-connected LEDs from a voltage input higher

than the LED forward voltage (Vin = 8.5 to

40VDC). It provides an adjustable output current

(1.2A maximum), which is set via an external

resistor

and

controlled

by

the

ZLED7x30’s

integrated high-side output current-sensing circuit

and high speed internal 40V power switch. Its low

conducting impedance ensures high system effi-

ciency.

The ZLED7x30 provides a switch dimming func-

tion. It detects external switch action to adjust out-

put current, allowing dimming functionality to be

achieved without changing the original lighting sys-

tem circuitry.

The switch dimming is implemented in either two-

level mode or three-level mode. The output current

of every level and the total number of levels are

customer selected by setting the corresponding

input conditions of DIM1 and DIM2 pin.

The ZLED7x30 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

protection. The ZLED7x30 can also minimize bill-

of-material

costs

because

very

few

external

components are required for most applications.

Only a resistor, a diode, an inductor, and three

capacitors

are

needed

for

a

typical

basic

application.

ZLED7x30 Typical Application Circuit

Features

Benefits

operation

installation

Available Support

Physical Characteristics

ZLED7x30 Family Selection Matrix

Product

Max. Current Output

Package

ZLED7030

1.2A

SOP-8

ZLED7330

1.0A

SOP-8

ZLED7530

0.75A

SOP-8

ZLED7730

0.35A

SOP-8

For additional information on our ZLED driver

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