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LM3492HCMH Fiches technique(PDF) 1 Page - Texas Instruments

No de pièce LM3492HCMH
Description  Two-Channel, Individual Dimmable LED Driver
Download  29 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM3492HCMH Fiches technique(HTML) 1 Page - Texas Instruments

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


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