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ZLED7025 Datasheet(PDF) 20 Page - Integrated Device Technology

Part # ZLED7025
Description  Boost LED Driver
PDF  26 Pages
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

ZLED7025 Datasheet(HTML) 20 Page - Integrated Device Technology

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ZSLS7025 Datasheet
© 2016 Integrated Device Technology, Inc.
20
April 20, 2016
Ω
≈
−
=
k
3
I
V
V
R
IN
DD
IN
VDD
s
1
R
10
40
t
TOFF
12
MIN
_
OFF
µ
=
×
×
=
−
Ω
≈
=
86
.
0
I
V
R
OUT
TH
_
FB
FB
Figure 4.2
Application Design Example – RC Filter PWM Dimming Circuit
TOFF
GATE
ZSLS7025
LED
String
VIN
COUT
R1
L1
CIN
D1
OVP
GND
RFB
VDD
CVDD
RVDD
RTOFF
ADJ
R2
RCS
Q1
FB
CS
R3
R4
PWM Control Signal
R5
C1
4.4.1
Selecting RVDD, CIN, and CVDD
Assume IIN = 2.5mA.
(14)
 Choose C
IN
as 220μF/35V and C
VDD
as 10μF/16V.
4.4.2
Selecting RTOFF to Set Minimum tOFF
The recommended value for tOFF_MIN
is 1μs.
(15)
 Choose R
TOFF
= 24kΩ.
4.4.3
Selecting RFB to Set Output Current and C3
(16)
 Choose
C3 = 220μF/63V (low ESR electrolytic capacitor).



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