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LM3421 Datasheet(PDF) 37 Page - Texas Instruments

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Part # LM3421
Description  N-Channel Controllers for Constant Current LED Drivers
PDF  65 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3421 Datasheet(HTML) 37 Page - Texas Instruments

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CO
D1
ROV2
ROV1
1A
ILED
RSNS
RFS
CFS
COV
Q2
VIN
VIN
OVP
nDIM
LM3421
AGND
VIN
PGND
DDRV
DAP
GATE
EN
COMP
VIN
CSH
RCT
IS
HSP
RPD
VCC
HSN
L1
CBYP
RLIM
Q1
CCMP
RCSH
RT
RUV2
RUV1
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RHSN
RHSP
CT
CIN
10V ± 70V
LM3421, LM3421-Q1
LM3423, LM3423-Q1
www.ti.com
SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011
The DDRV pin should be connected to the gate of the dimFET with or without level-shifting circuitry as described
in the PWM DIMMING section. The dimFET should be rated to handle the average LED current and the nominal
output voltage.
14. ANALOG DIMMING METHOD
Analog dimming can be performed several ways:
Method #1: Place a potentiometer in series with the RCSH resistor to dim the LED current from the nominal ILED
to near zero.
Method #2: Connect a controlled current source as detailed in the ANALOG DIMMING section to the CSH pin.
Increasing the current sourced into the CSH node will decrease the LEDs from the nominal ILED to zero current in
the same manner as the thermal foldback circuit.
Design Example
DESIGN #1 - LM3421 BUCK-BOOST Application
SPECIFICATIONS
N = 6
VLED = 3.5V
rLED = 325 mΩ
VIN = 24V
Copyright © 2008–2011, Texas Instruments Incorporated
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Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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