Data Sheet

ZSLS7025
Boost LED Driver
Brief Description
Features
The ZSLS7025, one of our ZSLS Family of LED
control ICs, is a constant current boost converter
designed for driving high-brightness LEDs. It is
optimal for driving multiple white LEDs connected
in series so that the LED current is uniform for
better brightness and color control. The wide input
range and high output current enables diverse
industrial, after-market automotive, and consumer
lighting applications.

The ZSLS7025 output current is adjustable via an
external current sense resistor and can deliver
stable constant output current from a few milliamps
up to 2A or higher.
The ZSLS7025 drives a constant current into the
load. The control loop features a pulse frequency
modulated (PFM) architecture that is inherently
stable and does not need loop compensation.
The ZSLS7025 supports pulse-width modulation
(PWM) or linear voltage dimming, which allows
flexible control of the LED luminance.
The ZSLS7025 can operate in applications with a
wide input voltage range from 5V to 100V. An
integrated over-voltage protection (OVP) circuit
protects the system, even under no-load
conditions. The over-voltage protection is
adjustable via external resistors R1 and R2.
Wide application input voltage range: 5V to 100V
(Higher voltage supported. See section 2.1 in the
data sheet.)
Constant current output limited only by external
component selection
No loop compensation required
Internal over-voltage protection





Internal over-temperature protection
Brightness control via PWM or DC voltage control
signal input

SOP-8 package
Benefits
 High efficiency: up to 95%
 Minimum bill of materials
 Small form-factor package
Available Support
 Demonstration Kit
Physical Characteristics
 Junction temperature: -40°C to 125°C
 RoHS compliant
For additional information on our LED driver family,
visit www.zmdi.com/products/led-drivers/
ZSLS7025 Typical Application Circuit
VIN =5 to 100 VDC
L1
CIN
RVDD
ZSLS7025
VDD
CVDD
GATE
TOFF
CS
ADJ
FB
GND
RTOFF
D1
Q1
R1
COUT
LED
String
OVP
RCS
R2
RFB
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
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.
ZSLS7025
Boost LED Driver
ZSLS7025 Block Diagram
5 to 100 VDC
VIN
L1
RVDD
D1
5V Clamp
VDD
CIN
Voltage
Regulator
Block
1
CVDD
Current
Mirror
ZSLS7025
Vref1 (1.0V)
Vref2 (0.3V)
TOFF
COUT
2
Vref3 (0.25V)
RTOFF
Vref4 (0.05V)
+
VDD
-
Vref4
50k
ADJ
3
Vref1
+
Q1
Blanking
500ns
900k
S
n LED
R Q
100k
GATE
-
5
+
FB
CS
+
6
Vref3
UVLO
+
Vref2
7
R1
-
POR
OVP
+
Vref1
8
RCS
GND
R2
RFB
4
Typical Applications
 Retro-fit Lighting
 Architectural/Building Lighting
 MR16 Lights
 Replacement Tubes
 SELV Lighting
 LED Backlighting
 Signage and Outdoor Lighting
 General Purpose Low-Voltage Industrial and Consumer Applications
Ordering Information
Product Sales Code
Description
Package
ZSLS7025-ZI1R
ZSLS7025 – Boost LED Driver
SOP-8 (Tape & Reel)
ZSLS7025KIT-D1
ZSLS7025PCB-D1 Demo Board, 1 ZLED-PCB10, and 5 ZSLS7025 ICs
Kit
Sales and Further Information
Zentrum Mikroelektronik
Dresden AG
Grenzstrasse 28
01109 Dresden
Germany
ZMD America, Inc.
1525 McCarthy Blvd., #212
Milpitas, CA 95035-7453
USA
Phone +49 (0)351.8822.7.533 Phone +855-ASK-ZMDI
Fax
+49 (0)351.8822.8.7533
(+855.275.9634)
www.zmdi.com
[email protected]
Zentrum Mikroelektronik
Dresden AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
ZMD FAR EAST, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Zentrum Mikroelektronik
Dresden AG, Korean Office
POSCO Centre Building
West Tower, 11th Floor
892 Daechi, 4-Dong,
Kangnam-Gu
Seoul, 135-777
Korea
Phone +81.3.6895.7410
Fax
+81.3.6895.7301
Phone +886.2.2377.8189
Fax
+886.2.2377.8199
Phone +82.2.559.0660
Fax
+82.2.559.0700
DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Zentrum Mikroelektronik Dresden AG
(ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The information furnished hereby is believed to be true and accurate. However, under
no circumstances shall ZMD AG be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever
arising out of or in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any customer, licensee or any
other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for any damages in connection with or arising out of the furnishing,
performance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise.
© 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.00
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.