LM3429 Datasheet, PDF (1/62 Pages) National Semiconductor (TI) – N-Channel Controller for Constant Current LED Drivers

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LM3429, LM3429-Q1
SNVS616H – APRIL 2009 – REVISED JULY 2015
LM3429/-Q1 N-Channel Controller for Constant Current LED Drivers
1 Features
•1 LM3429-Q1 is AEC-Q100 Grade 1 Qualified for
Automotive Applications
• V_IN Range From 4.5 V to 75 V
• Adjustable Current Sense Voltage
• High-Side Current Sensing
• 2-Ω, 1-A Peak MosFET Gate Driver
• Input Undervoltage Protection
• Overvoltage Protection
• PWM Dimming
• Analog Dimming
• Cycle-by-Cycle Current Limit
• Programmable Switching Frequency
• Low Profile 14-lead HTSSOP Package
• Thermal Shutdown
2 Applications
• LED Drivers - Buck, Boost, Buck-Boost, SEPIC
• Indoor and Outdoor SSL
• Automotive
• General Illumination
• Constant-Current Regulators
3 Description
The LM3429 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. This flexibility, along with an input voltage
rating of 75V, makes the LM3429 ideal for
illuminating LEDs in a very diverse, large family of
applications.
Adjustable high-side current sense voltage allows for
tight regulation of the LED current with the highest
efficiency possible. The LM3429 uses Predictive Off-
time (PRO) control, which is a combination of peak
current-mode control and a predictive off-timer. This
method of control eases the design of loop
compensation while providing inherent input voltage
feed-forward compensation.
The LM3429 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 MHz, thus
enabling compact solutions. Additional features
include analog dimming, PWM dimming, overvoltage
protection, undervoltage lock-out, cycle-by-cycle
current limit, and thermal shutdown.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM3429
LM3429-Q1
HTSSOP (14)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Boost Application Circuit
V_IN
1 VIN
LM3429
14
HSN
2
COMP
13
HSP
3
CSH
4
RCT
12
IS
11
VCC
I_LED
5
AGND
10
GATE
6
OVP
PWM
7
nDIM
DAP
9
PGND
8
NC
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.