ZSLS7025ZI1R ZMDI, ZSLS7025ZI1R Datasheet - Page 12

• 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

2.6.1
The LED output current can be set below the nominal average value defined by equation (2) using an external DC
voltage control signal superimposed on the FB pin as shown in the example circuit in Figure 2.2. As the DC
control signal, V
FB pin. This causes the ZSLS7025 to compensate by reducing the output current through the LED string.
Consequently, the output current is inversely proportional to the DC control voltage.
Note: It is important to ensure that the LED output voltage V
dimming applications.
The output current controlled by the DC voltage on FB can be calculated using equation (3).
Where
Figure 2.2
Data Sheet
June 28, 2012
ZSLS7025
Boost LED Driver
I
V
V
OUT
FB
DC
= Internal feedback reference voltage (see section 1.3, parameter 1.3.11)
= External DC control voltage
= Output current through the LED(s) with a DC control voltage
Dimming Control Using an External DC Control Signal
I
OUT
Example Circuit for Controlling Output Current via an External DC Control Voltage

DC
V
FB
, increases, the current through R
© 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

IN
C




=5 to 100 VDC
C
VDD
R
IN
3
R


FB
V
R
R
DC
VDD
4
R

TOFF
V
FB

VDD
TOFF
ADJ
GND




ZSLS7025
L
1
GATE
OVP
3
CS
FB
increases with a subsequent increase in the voltage at the
DC Control Signal V
OUT
Q
R
1
CS
D
remains higher than the input voltage V
1
DC
= 0 to 5V
R
R
1
2
C
OUT
R
4
R
3
String
LED
R
FB
12 of 27
(3)
IN
in