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LM3421 Datasheet(PDF) 10 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) 10 Page - Texas Instruments

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background image
IS
AGND
PWM
Start new on time
nDIM
COMP
REFERENCE
CURRENT
LIMIT
CSH
HSN
LOGIC
HSP
EN
OVP
HYSTERESIS
LED CURRENT LOW
S
R
Q
UVLO
DDRV
GATE
PGND
OVP
LRDY
RPD
EN
LatchOff
TIMR
OVLO
FLT
LED CURRENT HIGH
Regulator
Thermal
Limit
TLIM
TLIM
OVLO
PGND
LatchOff
Standby
Dimming
Reset
Dominant
RCT
800 mV
820k
500k
LEB
In the LM3421, TIMR is internally shorted to AGND.
1.235V
6.9V LDO
(4.1V)
DPOL
Grey pins are available in the LM 3423 only.
LEB
W = 150 ns
VIN/25
VIN UVLO
HYSTERESIS
1.24V
VCC
1.235V
VCC
1.24V
1.24V
0.245V
1.0V
1.6V
VCC UVLO
VCC
VCC UVLO
VIN
23 PA
23 PA
11.5 PA
LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574D – JULY 2008 – REVISED SEPTEMBER 2011
www.ti.com
BLOCK DIAGRAM
THEORY OF OPERATION
The LM3421/23 are N-channel MosFET (NFET) controllers for buck, boost and buck-boost current regulators
which are ideal for driving LED loads. The controller has wide input voltage range allowing for regulation of a
variety of LED loads. The high-side differential current sense, with low adjustable threshold voltage, provides an
excellent method for regulating output current while maintaining high system efficiency. The LM3421/23 uses a
Predictive Off-time (PRO) control architecture that allows the regulator to be operated using minimal external
control loop compensation, while providing an inherent cycle-by-cycle current limit. The adjustable current sense
threshold provides the capability to amplitude (analog) dim the LED current and the output enable/disable
10
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Copyright © 2008–2011, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1



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