ZLED7730

High Current 40V LED Driver with Switch Dimming

Data Sheet

August 16, 2011

© 2011 Zentrum Mikroelektronik Dresden AG — Rev.1.2

All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

15 of 23

Vin

LX

GND

ZLED7X30

D1

LED

String

Vs = 8.5 to 40 VDC

(C3)

Rs

L1

33 to 220 H

C2

0.1 F

DIM1

DIM2

GND/Floating

GND/Floating

Switch

C1

≥220 F

Vin

LX

GND

ZLED7X30

D1

LED

String

Vs = 8.5 to 40 VDC

(C3)

Rs

L1

33 to 220 H

C2

0.1 F

DIM1

DIM2

(C1)

3

Application Circuit Design

3.1

Applications

The ZLED7x30 is designed for applications requiring features such as high-speed switching, variable brightness

control, operation with voltages up to 40V, high efficiency, or protection from over-temperature, or open LED

circuit conditions.

Typical applications include MR16/MR11 LED spot lights, LED street lights, parabolic aluminized reflector (PAR)

LED lights, and other general purpose industrial and consumer LED applications.

Figure 3.1 shows the minimum configuration for switch dimming applications. Figure 3.2 demonstrates the basic

application circuit with the additional capacitors C1 and C3 for enhanced performance. For dimensioning of the

current sense resistor, see section 2. An example of operation with a halogen lamp electronic transformer is

shown in Figure 3.3.

Figure 3.1

ZLED7x30 Application Circuit for Switch Dimming

Figure 3.2

Basic ZLED7x30 Application Circuit with Output Current Determined only by Rs