ZSLS7025ZI1R ZMDI, ZSLS7025ZI1R Datasheet - Page 18

• Manufacturer Part Number: ZSLS7025ZI1R
• Description: LED Lighting Drivers LED Driver
• Manufacturer: ZMDI

Specifications of ZSLS7025ZI1R

• Rohs: yes
• Input Voltage: 5 V
• Maximum Supply Current: 400 uA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Minimum Operating Temperature: - 40 C

4
4.1
The ZSLS7025 is ideal for driving white HB-LEDs in diverse industrial, after-market automotive, and consumer
lighting applications using low supply voltages, such as SELV applications. It is optimal for driving multiple white
HB-LEDs connected in series so that the LED current is uniform for better brightness and color control. It features
a wide input range and high output current.
Figure 4.1 demonstrates the typical application with the external components described in section 4.2. Figure 2.2,
Figure 2.3, and Figure 2.4 demonstrate various dimming applications.
Figure 4.1
4.2
Note: Also see section 4.3 for layout guidelines for the following external components.
4.2.1
The ZSLS7025 has an internal 5V shunt regulator connected to the VDD pin. The R
connected between the VDD pin and V
4.2.2
See section 2.9 for calculating the proper value for L
input average current and a saturation current over the calculated peak current. To calculate the worst case
inductor peak current, use the minimum input voltage, maximum output voltage, and maximum total LED current.
Also ensure that the inductor has a low DCR (copper wire resistance) to minimize the I
Data Sheet
June 28, 2012
ZSLS7025
Boost LED Driver
Application Circuit Design
Applications
External Component Selection
Series Resistor R
Inductor L
Typical ZSLS7025 Application Circuit
© 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.
V
1
IN
C
=5 to 100 VDC
C
VDD
IN
VDD
R
VDD
R
TOFF
IN
VDD
TOFF
ADJ
GND
to limit current flow. See section 2.1 regarding input voltages over 100V.
ZSLS7025
L
1
GATE
OVP
CS
FB
1
. Select an inductor with a current rating higher than the
Q
R
1
CS
D
1
R
R
1
2
C
OUT
2
VDD
R power
series resistor must be
String
LED
R
FB
loss.
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