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LM3421 Datasheet(PDF) 55 Page - Texas Instruments

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Part # LM3421
Description  N-Channel Controllers for Constant-Current LED Drivers
PDF  72 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3421 Datasheet(HTML) 55 Page - Texas Instruments

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CO
D1
ROV2
ROV1
500 mA
ILED
RSNS
RFS
CFS
COV
Q5
VIN
10V ± 70V
Q7
Q6
Q4
D2
VIN
DIM
RPU
RSER
DIM
CB
CF
RF
Q2
Q1
PWM
OVP
nDIM
LM3421
AGND
VIN
PGND
DDRV
DAP
GATE
EN
COMP
VIN
CSH
RCT
IS
HSP
RPD
VCC
HSN
CBYP
CCMP
RT
RUV2
RUV1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RHSN
RHSP
Q3
CT
CIN
RCSH
RUVH
L1
CCSH
External
Enable
CEN
Q8
RCT
RCT
Q9
LM3421, LM3421-Q1, LM3423, LM3423-Q1
www.ti.com
SNVS574F – JULY 2008 – REVISED JULY 2015
8.2.6 LM3421 Buck-Boost Application
Figure 41. LM3421 Buck-Boost Application
8.2.6.1 Design Requirements
•
Input: 10 V to 70 V
•
Output: 6 LEDs at 500 mA
•
PWM Dimming up to 10 kHz
•
Slow Fade Out
•
MOSFET RDS-ON Sensing
•
700-kHz Switching Frequency
Copyright © 2008–2015, Texas Instruments Incorporated
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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