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LM3492HCMHX датащи(PDF) 3 Page - Texas Instruments |
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LM3492HCMHX датащи(HTML) 3 Page - Texas Instruments |
3 / 29 page 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 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 Submit Documentation Feedback 3 Product Folder Links: LM3492HC-Q1 LM3492HC |
Аналогичный номер детали - LM3492HCMHX |
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Аналогичное описание - LM3492HCMHX |
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