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LM3492HC Datasheet Preview

LM3492HC Datasheet

LED Driver

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LM3492HC-Q1, LM3492HC
SNVS797B – MARCH 2012 – REVISED OCTOBER 2015
LM3492HC/-Q1 Two-Channel, Individual Dimmable, LED Driver
With Boost Converter and Fast Current Regulator
1 Features
1 Boost Converter
– Automotive Grade Product, Q100 Grade-1
Qualified
– Very Wide Input Voltage Range: 4.5 V to 65 V
– Programmable Soft-Start Period
– No Loop Compensation Required
– Stable with Ceramic and Other Low ESR
Capacitors with No Audible Noise
– Nearly Constant Switching Frequency
Programmable from 200 kHz to 1 MHz
• Current Regulator
– Programmable LED Current: 50 mA to 250 mA
– 10000:1 Contrast Ratio, 300-ns Minimum
Pulse Width
– Two Individual Dimmable LED Strings up to
65 V, Total 15 W (Typically 28 LEDs at
150 mA)
– Dynamic Headroom Control Maximizes
Efficiency
– Over-Power Protection
– ±3% Current Accuracy
• Supervisory Functions
– Precision Enable
– COMM I/O Pin for Diagnostic and Commands
– Thermal Shutdown Protection
– Thermally Enhanced PWP, 20-Pin Package
2 Applications
• Ultra-High Contrast Ratio 6.5” to 10” LCD Display
Backlight up to 28 LEDs
• Automotive or Marine GPS Display
3 Description
The LM3492HC/-Q1 device integrates a boost
converter and a two-channel current regulator to
implement a highly efficient and cost effective LED
driver. This device drives two individually dimmable
LED strings with a maximum power of 15 W and an
output voltage of up to 65 V. The boost converter
employs a proprietary projected-on-time control
method to give a fast transient response with no
compensation required. The nearly constant
switching frequency can be set to a level from 200
kHz to 1 MHz. Ceramic capacitors stabilize the
application circuit and produce no audible noise on
dimming. The programmable peak current limit and
soft-start features reduce current surges at start-up.
An integrated, 190-m, 3.9-A, N-Channel MOSFET
switch minimizes the solution size. The fast slew rate
current regulator allows high frequency and narrow
pulse width dimming signals to achieve a very high
contrast ratio of 10000:1. The LED current can be set
from 50 mA to 250 mA by a single resistor.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM3492HC
LM3492HC-Q1
PWP (20)
6.50 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application
L1
CIN
CCDHC
CVCC
RCOMM
LM3492HC
LM3492HC-Q1
VIN SW
CDHC
VCC
EN
RT
VOUT
FB
PGND
IREF
GND
ILIM
COMM
LGND
DIM1/CLK IOUT1
DIM2
IOUT2
RRT
RIREF
CFB
RFB1
COUT
RFB2
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.




etcTI

LM3492HC Datasheet Preview

LM3492HC Datasheet

LED Driver

No Preview Available !

LM3492HC-Q1, LM3492HC
SNVS797B – MARCH 2012 – REVISED OCTOBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (continued)......................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 5
7.6 Typical Characteristics .............................................. 7
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagram ....................................... 11
8.3 Feature Description................................................. 12
8.4 Device Functional Modes........................................ 17
8.5 Programming .......................................................... 18
9 Application and Implementation ........................ 19
9.1 Application Information............................................ 19
9.2 Typical Application ................................................. 19
10 Power Supply Recommendations ..................... 22
11 Layout................................................................... 22
11.1 Layout Guidelines ................................................. 22
11.2 Layout Example .................................................... 22
12 Device and Documentation Support ................. 23
12.1 Related Links ........................................................ 23
12.2 Community Resources.......................................... 23
12.3 Trademarks ........................................................... 23
12.4 Electrostatic Discharge Caution ............................ 23
12.5 Glossary ................................................................ 23
13 Mechanical, Packaging, and Orderable
Information ........................................................... 23
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (May 2013) to Revision B
Page
• Added Pin Configuration and Functions section, ESD Rating table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1
2 Submit Documentation Feedback
Copyright © 2012–2015, Texas Instruments Incorporated
Product Folder Links: LM3492HC-Q1 LM3492HC


Part Number LM3492HC
Description LED Driver
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