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IS32LT3175N Datasheet(PDF) 1 Page - Integrated Silicon Solution, Inc |
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IS32LT3175N Datasheet(HTML) 1 Page - Integrated Silicon Solution, Inc |
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1 / 19 page  IS32LT3175N/P Integrated Silicon Solution, Inc. – www.issi.com Rev.A, 07/19/2016 1 SINGLE CHANNEL LINEAR LED DRIVER WITH FADE IN/OUT AND PWM DIMMING July 2016 GENERAL DESCRIPTION The IS32LT3175 is a single channel linear programmable current regulator capable of up to 150mA. It integrates a debounce and latch circuit on the channel enable pin (EN) to facilitate the use of a low cost momentary contact switch. The PWM pin can be interfaced to a logic level “courtesy light” signal to directly drive the LED channel. The IS32LT3175P accepts a positive polarity PWM signal while the IS32LT3175N accepts a negative polarity PWM signal. The device operates as a stand-alone LED driver configurable with external resistors; no microcontroller is required. A single external resistor programs the current level, while two separate resistors independently program the fade in and fade out ramp rate for the channel. The device integrates a 63 steps fade in and fade out algorithm (Gamma correction) which causes the output LED current to gradually ramp up to the full source value after the EN pin is pulsed. The same controller causes the LED current to gradually ramp down to zero if the EN pin is pulsed while the output channel is ON. The fade ramp can be interrupted mid-cycle before completion of the ramp cycle. The EN pin will accept either a momentary contact switch or logic level signal pulsed low. The IS32LT3175 is targeted at the automotive market with end applications to include map and dome lighting as well as exterior accent lighting. For 12V automotive applications the low dropout driver can support 1 to 3 LEDs (VF = 3.2V) per channel. It is offered in a small thermally enhanced SOP-8-EP package. FEATURES Operating voltage 5V to 42V Single channel current source - Programmable current via a single external resistor - Configurable from 20mA to 150mA Momentary contact button EN input - Input is debounced and latched - Higher priority than PWM input - Gamma corrected Fade In/Out algorithm - Pull down resistors set independent fade IN and OUT ramp time PWM input pin driven by external PWM source - PWM directly drives the current source - IS32LT3175P – Positive polarity - IS32LT3175N – Negative polarity Fault Protection: - OUT pin shorted to GND - ISET pin shorted to GND - Over temperature SOP-8-EP package Automotive Grade: - IS32LT3175P – AEC-Q100 - IS32LT3175N – AEC-Q100 Operating temperature range from -40°C ~ +125°C APPLICATIONS Automotive Interior: - Map/Dome light - Puddle lamp in doors - Glove box - Vanity mirror TYPICAL APPLICATION CIRCUIT Figure 1 Typical Application Circuit Note: The resistor RPWM is a fixed value. Please don’t change it. CPWM is optional. Add it for robust electromagnetic susceptibility. |
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