LM3424 Datasheet, PDF (1/69 Pages) National Semiconductor (TI) – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs

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LM3424, LM3424-Q1
SNVS603C – AUGUST 2009 – REVISED AUGUST 2015
LM3424/-Q1 Constant Current N-Channel Controller with Thermal Foldback for Driving
LEDs
1 Features
•1 LM3424-Q1 is an Automotive Grade Product That
is AEC-Q100 Grade 1 Qualified
• V_IN Range from 4.5V to 75V
• High-Side Adjustable Current Sense
• 2-Ω, 1-A Peak MOSFET Gate Driver
• Input Undervoltage and Output Overvoltage
Protection
• PWM and Analog Dimming
• Cycle-by-Cycle Current Limit
• Programmable Softstart and Slope Compensation
• Programmable, Synchronizable Switching
Frequency
• Programmable Thermal Foldback
• Precision Voltage Reference
• Low Power Shutdown and Thermal Shutdown
2 Applications
• LED Drivers - Buck, Boost, Buck-Boost, and
SEPIC
• Indoor and Outdoor Area SSL
• Automotive
• General Illumination
• Constant-Current Regulators
Typical Boost Application Circuit
VIN
1
VIN
LM3424
20
HSP
3 Description
The LM3424 is a versatile high voltage N-channel
MOSFET controller for LED drivers. It can be easily
configured in buck, boost, buck-boost and SEPIC
topologies. In addition, the LM3424 includes a
thermal foldback feature for temperature
management of the LEDs. This flexibility, along with
an input voltage rating of 75 V, makes the LM3424
ideal for illuminating LEDs in a large family of
applications.
Adjustable high-side current sense allows for tight
regulation of the LED current with the highest
efficiency possible. The LM3424 uses standard peak
current-mode control providing inherent input voltage
feed-forward compensation for better noise immunity.
It is designed to provide accurate thermal foldback
with a programmable foldback breakpoint and slope.
In addition, a 2.45V reference is provided.
The LM3424 includes a high-voltage startup regulator
that operates over a wide input range of 4.5 V to 75
V. The internal PWM controller is designed for
adjustable switching frequencies of up to 2.0 MHz
and external synchronization is possible. The
controller is capable of high speed PWM dimming
and analog dimming.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3424
LM3424-Q1
HTSSOP (20)
6.50 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
2
EN
19
HSN
3
COMP
18
SLOPE
4
CSH
5
RT/SYNC
17
IS
16
VCC
ILED
PWM
6
nDIM
15
GATE
7
SS
14
GND
8
TGAIN
13
DDRV
9
TEMP
TSENSE
DAP
10
TREF
12
OVP
11
VS
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.