ZLED7010

40V LED Driver with Temperature Compensation

© 2010 Zentrum Mikroelektronik Dresden AG — Rev. 1.1

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

Brief Description

The ZLED7010, one of our ZLED Family of LED control

ICs, is an inductive step-down converter that is optimal

for driving a single LED or multiple LEDs (connected in

series) from a voltage source greater than the voltage

rating of the LED. The ZLED7010 operates in continu-

ous mode. Capable of operating efficiently with voltage

supplies ranging from 6 VDC to 40 VDC, it is ideal for

low-voltage lighting applications. The ZLED7010 mini-

mizes current consumption by remaining in a low-current

standby mode (output is off) until a voltage of ≥0.3V is

In operating mode, the ZLED7010 can source LEDs with

an output current of ≤ 750mA (≤ 30 watts of output

power*) that is externally adjustable. The ZLED7010’s

integrated output switch and high-side current sensing

circuit use an external resistor to adjust the average out-

put current. LED control is achieved via an external con-

a pulse-width modulation (PWM) waveform for a gated

output current or a DC voltage for continuous current.

The ZLED7010 provides a temperature compen-

sation function for maintaining stable and reliable

LED operation. LED over-temperature conditions

are detected via a negative temperature coefficient

(NTC) thermistor mounted close to the LEDs. If an

over-temperature condition occurs, the NTC value

reaches the value of a threshold resistor and the

IC reduces LED current automatically. After the

circuit recovers to a safe temperature, current

returns to the set value.

can be interconnected as a driver chain deploying

the temperature compensation information of the

predecessor. This reduces the part count because

only the first stage of the series requires an NTC.

GND

LX

ZLED7010

n LED

L1

R3

NTC

C1

1μF

C2

100nF

R2

D1

47μH

6 to 40 VDC

12

8

5

7

6

3

4

Features

 Capable of 95% efficiency*

 Operates in continuous mode with a wide input

range from 6 VDC to 40 VDC

 Integrated 40V power switch

 One-pin on/off or brightness control via DC voltage

or PWM control signal

 Switching frequency: ≤ 1MHz

 Dimming rate: 1200:1 (typical)

 Output current accuracy: 5% (typical)

 Built-in temperature compensation and open-circuit

protection for LEDs

 Thermal shutdown protection for the ZLED7010

 Very few external components needed for operation

 Broad range of applications: outputs up to ≤750mA

 SOP-8 package

Application Examples

 Illuminated LED signs and other displays

 LED traffic and street lighting (low-voltage)

 Architectural LED lighting, including low-voltage

applications for buildings

 Halogen replacement LEDs (low-voltage)

 LED flood-lighting

 LED backlighting

 General purpose exterior and interior LED lighting,

including applications requiring low-voltage

 General purpose low-voltage industrial applications

ZLED7010 Application Circuit