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LM3492Q датащи(PDF) 2 Page - Texas Instruments

номер детали LM3492Q
подробное описание детали  Two-Channel Individual Dimmable LED Driver with Boost Converter and Fast Current Regulator
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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LM3492Q датащи(HTML) 2 Page - Texas Instruments

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LM3492, LM3492Q
SNVS656C – SEPTEMBER 2010 – REVISED MAY 2013
www.ti.com
DESCRIPTION CONTINUED
The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a
very high contrast ratio of 1000:1 at a dimming frequency of more than 3 kHz. The LED current is programmable
from 50 mA to 200 mA by a single resistor.
To maximize the efficiency, Dynamic Headroom Control (DHC) automatically adjusts the output voltage to a
minimum. DHC also facilitates a single BOM for different number of LED in a string, which is required for
backlight panels of different size, thereby reducing overall development time and cost. The LM3492 comes with a
versatile COMM pin which serves as a bi-directional I/O pin interfacing with an external MCU for the following
functions: power-good, over-temperature, IOUT over- and under-voltage indications, switching frequency tuning,
and channel 1 disabling. Other supervisory functions of the LM3492 include precise enable, VCC under-voltage
lock-out, current regulator over-power protection, and thermal shutdown protection. The LM3492 is available in
the thermally enhanced 20-pin HTSSOP package.
CONNECTION DIAGRAM
Figure 1. 20-Pin HTSSOP (Top View)
See PWP0020A Package
PIN DESCRIPTIONS
Pin
Name
Description
Application Information
1
EN
Enable
Internally pull-up. Connect to a voltage higher than 1.63V to provide
precision enable for the device.
2
VIN
Input Supply Voltage
Supply pin to the device. Input range is 4.5V to 65V.
3, 4
SW
Switch Node
Internally connected to the drain of the integrated MOSFET.
5
VOUT
Output Voltage Sense
Sense the output voltage for nearly constant switching frequency control.
6
RT
Frequency Control
An external resistor from the VOUT pin to this pin sets the switching
frequency.
7
FB
Output Voltage Feedback
The output voltage is connected to this pin through a feedback resistor
divider for output voltage regulation. The voltage of this pin is from 1.05V to
2.5V.
8
GND
Analog Ground
Signal Ground
9
IOUT2
Current Regulator Input of Channel 2
Input of the current regulator of channel 2. The regulated current is
programmable (refer to the IREF pin).
10
IOUT1
Current Regulator Input of Channel 1
Input of the current regulator of channel 1. The regulated current is
programmable (refer to the IREF pin).
11
CDHC
Dynamic Headroom Control
An external capacitor connected to this pin sets the DHC sensitivity. At
startup, a 120 µA internal current source charges an external capacitor to
provide a soft-start function.
12
IREF
Current Setting of the Current Regulator An external resistor connected from this pin to ground programs the
regulated current of the current regulator of channels 1 and 2.
13
COMM
Bi-directional Logic Communication
This pin is open drain for various indications (power-good, over-
temperature, IOUT over- and under-voltage) and command sending
(switching frequency tuning and channel 1 disabling).
2
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Copyright © 2010–2013, Texas Instruments Incorporated
Product Folder Links: LM3492 LM3492Q


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