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LM3492HCMH Datasheet(PDF) 3 Page - Texas Instruments

No. de pieza LM3492HCMH
Descripción Electrónicos  Two-Channel, Individual Dimmable LED Driver
Download  29 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM3492HCMH Datasheet(HTML) 3 Page - Texas Instruments

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20
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16
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13
12
11
EN
VIN
SW
SW
VOUT
RT
FB
GND
IOUT2
IOUT1
ILIM
VCC
PGND
PGND
DIM2
DIM1/CLK
LGND
COMM
IREF
CDHC
NC – No internal connection
Exposed
Thermal
Pad
LM3492HC-Q1, LM3492HC
www.ti.com
SNVS797B – MARCH 2012 – REVISED OCTOBER 2015
5 Description (continued)
To maximize the efficiency, dynamic headroom control (DHC) automatically adjusts the output voltage to a
minimum. The DHC also facilitates a single BOM for different number of LED in a string, which is required for
back-light panels of different size, thereby reducing overall development time and cost. The LM3492HC device
includes a COMM pin that serves as a bidirectional I/O pin. The versatile COMM pin interface with an external
micro-controller unit (MCU) is used for the following functions: power-good, overtemperature, IOUT overvoltage
and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of
the device include precise enable, VCC undervoltage lockout, current regulator over-power protection, and
thermal shutdown protection. The device is available in the thermally enhanced PWP, 20-pin package.
6 Pin Configuration and Functions
PWP Package
20 Pin HTSSOP
Top View
Pin Functions
PIN
TYPE(1)
DESCRIPTION
NAME
NO.
Dynamic headroom control. An external capacitor connected to this pin sets the DHC sensitivity. At
CDHC
11
I
start-up, a 12- µA internal current source charges an external capacitor to provide a soft-start
function.
Bidirectional logic communication. This pin is open drain for various indications (power-good,
COMM
13
I/O
overtemperature, IOUT overvoltage and undervoltage) and command sending (switching frequency
tuning and channel 1 disabling).
Dimming control of channel 1. Control the on and off of the current regulator of channel 1. This pin is
DIM1/CLK
15
I/O
internally pulled low by a 5-µA current. This pin also serves as a clock signal for latching input and
output data of the COMM pin.
Dimming control of channel 2. Control the on and off of the current regulator of channel 2. This pin is
DIM2
16
I
internally pulled low by a 5-µA current.
Enable input. Contains an internal pullup. Connect to a voltage higher than 1.63 V to provide
EN
1
I
precision enable for the device.
Output voltage feedback. The output voltage is connected to this pin through a feedback resistor
FB
7
I
divider for output voltage regulation. The voltage of this pin is from 1.05 V to 2.5 V.
GND
8
G
Analog signal ground. Connect to the exposed pad directly beneath the device.
Peak current limit adjust. Connecting an external resistor from the ILIM pin to the VCC pin reduces
ILIM
20
I
peak current limit. Connect the ILIM pin to ground to obtain the maximum current limit.
Current regulator input for channel 1. Input of the current regulator of channel 1. The regulated
IOUT1
10
I
current is programmable (see the IREF pin).
Current regulator input for channel 2. Input of the current regulator of channel 2. The regulated
IOUT2
9
I
current is programmable (see the IREF pin).
Current setting pin for the current regulators. An external resistor connected from this pin to ground
IREF
12
I
programs the regulated current of the current regulator of channels 1 and 2.
(1)
I = Input, O = Output, G = Ground
Copyright © 2012–2015, Texas Instruments Incorporated
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Product Folder Links: LM3492HC-Q1 LM3492HC


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