ZLED7000

40V LED Driver with Internal Switch

© 2010 Zentrum Mikroelektronik Dresden AG — Rev. 1.1

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Brief Description

The ZLED7000, 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 ZLED7000 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

ZLED7000

minimizes current consumption by remaining in a low-

current standby mode (output is off) until a voltage of

≥0.3V is applied to the ADJ pin.

In operating mode, the ZLED7000 can source LEDs with

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

power) that is externally adjustable.* The ZLED7000’s

integrated output switch and high-side current sensing

circuit use an external resistor to adjust the average

output current. Linearity is achieved via an external

control signal at the ZLED7000’s ADJ pin, implemented

either as a pulse-width modulation (PWM) waveform for

a gated output current or a DC voltage for a continuous

current.

ZLED7000 Application Circuit

ADJ

GND

LX

ZLED7000

n LED

L1

C1

1μF

D1

47μH

6 to 40 VDC

54

1

2

3

Features

 Capable of up to 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 PWM or DC

voltage control signal input

 Switching frequency: ≤ 1MHz

 Dimming rate: 1200:1 (typical)

 Output current accuracy: 5% (typical)

 Built-in thermal shutdown and open-circuit protection

for LED

 Very few external components needed for operation

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

 SOT89-5 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 backlighting

 General purpose exterior and interior LED lighting,

including applications requiring low-voltage

 General purpose low-voltage industrial applications