ZSLS7025ZI1R ZMDI, ZSLS7025ZI1R Datasheet - Page 4

• 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

Contents
1
2
3
4
Data Sheet
June 28, 2012
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
3.1
3.2
4.1
4.2
4.3
4.4
ZSLS7025
Boost LED Driver
2.6.1
2.6.2
2.6.3
4.2.1
4.2.2
4.2.3
4.2.4
4.2.5
4.2.6
4.2.7
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
IC Characteristics .......................................................................................................................................................... 6
Circuit Description ....................................................................................................................................................... 10
Operating Conditions ................................................................................................................................................... 17
Application Circuit Design............................................................................................................................................ 18
Absolute Maximum/Minimum Ratings .................................................................................................................... 6
Operating Conditions ............................................................................................................................................. 6
Electrical Parameters ............................................................................................................................................. 7
Typical Performance Characteristics Graphs ......................................................................................................... 8
ZSLS7025 Overview ............................................................................................................................................ 10
Boost Converter ................................................................................................................................................... 10
Internal 5V Regulator ........................................................................................................................................... 11
Input Current ........................................................................................................................................................ 11
LED Current Control ............................................................................................................................................ 11
Dimming Control .................................................................................................................................................. 11
Peak Input Current Control .................................................................................................................................. 14
Setting the Minimum Off-Time t
Switching Frequency and Inductor Value ............................................................................................................. 15
DC Power Loss .................................................................................................................................................... 16
Under-Voltage Lockout ........................................................................................................................................ 17
Over-Voltage Protection ....................................................................................................................................... 17
Applications .......................................................................................................................................................... 18
External Component Selection ............................................................................................................................. 18
Application Circuit Layout Requirements ............................................................................................................. 20
Application Example ............................................................................................................................................ 20
Dimming Control Using an External DC Control Signal ................................................................................ 12
Dimming Control Using an RC Filter to Convert a PWM Signal to a DC Voltage.......................................... 13
PWM Dimming with a Dimming Control MOSFET (Q
Series Resistor R
Inductor L
High Frequency Noise Filter Capacitor C
Input Capacitor C
Output Capacitor C
Schottky Rectifier Diode D
External MOSFET Q
Selecting R
Selecting R
Selecting R
Selecting R
R
CS
for Setting Input Peak Current ............................................................................................................... 23
© 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.
1
.................................................................................................................................................... 18
VDD
TOFF
FB
3
, R
to Set Output Current and C3 ................................................................................................. 21
, C
4
to Set Minimum t
, R
VDD
IN
IN
, and C
5
OUT
....................................................................................................................................... 19
and C
1
..................................................................................................................................... 18
.................................................................................................................................... 19
for Reducing Output Ripple ...................................................................................... 19
1
VDD
1
OFF_MIN
........................................................................................................................... 19
.......................................................................................................................... 22
....................................................................................................................... 21
OFF
................................................................................................................. 15
............................................................................................................. 21
VDD
................................................................................................ 19
2
)................................................................................. 14
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