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| LM3429_14 Datasheet, PDF (30/50 Pages) Texas Instruments – LM3429Q1 N-Channel Controller for Constant Current LED Drivers | |||
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LM3429
SNVS616F â APRIL 2009 â REVISED JANUARY 2010
Design Example #1
BUCK-BOOST APPLICATION - 6 LEDs at 1A
10V ± 70V
VIN
L1
CIN
RT
CCMP
1
VIN
LM3429
2
COMP
14
HSN
RHSN
13
HSP
RHSP
RCSH
3
CSH
12
IS
CT
4
RCT
5
AGND
11
VCC
CBYP
10
GATE
RUV2
RUV1
6
OVP
7
nDIM
DAP
9
PGND
8
NC
www.ti.com
D1
1A
ILED
CO
Q1
RLIM
CFS
RFS
RSNS
VIN
ROV2
VIN
Q2
COV
ROV1
SPECIFICATIONS
N=6
VLED = 3.5V
rLED = 325 mâ¦
VIN = 24V
VIN-MIN = 10V
VIN-MAX = 70V
fSW = 700 kHz
VSNS = 100 mV
ILED = 1A
ÎiL-PP = 500 mA
ÎiLED-PP = 50 mA
ÎvIN-PP = 1V
ILIM = 6A
VTURN-ON = 10V
VHYS = 3V
VTURN-OFF = 40V
VHYSO = 10V
1. OPERATING POINT
Solve for VO and rD:
30
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Copyright © 2009â2010, Texas Instruments Incorporated
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