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| LM3421 Datasheet, PDF (51/72 Pages) National Semiconductor (TI) – N-Channel Controllers for Constant Current LED Drivers | |||
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8.2.4 LM3421 Buck-Boost Application
10V ± 30V L1
VIN
LM3421, LM3421-Q1, LM3423, LM3423-Q1
SNVS574F â JULY 2008 â REVISED JULY 2015
D1
RUV2
1
VIN
LM3421
16
HSN
RHSN
CIN
2
EN
RT
CCMP 3
COMP
15
HSP
RHSP
14
RPD
RPOT RCSH 4
CSH
13
IS
2A
ILED
CO
DIM
Q2
CFS
RFS
RSNS
VIN
RF
CT
RUVH
5
RCT
6
AGND
7
OVP
8
nDIM
DAP
12
VCC
CBYP
11
GATE
10
PGND
9
DDRV
RPU
Q7
CF
DIM
ROV2
Q1
Q6
Q4
CB D2
RLIM
RSER
Q5
VIN
RUV1
Q3
PWM
COV
ROV1
Figure 39. LM3421 Buck-Boost Application
8.2.4.1 Design Requirements
⢠Input: 10 V to 30 V
⢠Output: 4 LEDs at 2 A
⢠PWM Dimming up to 10 kHz
⢠Analog Dimming
⢠600-kHz Switching Frequency
Copyright © 2008â2015, Texas Instruments Incorporated
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1
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