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IS31LT3938 Datasheet(PDF) 1 Page - Integrated Silicon Solution, Inc |
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IS31LT3938 Datasheet(HTML) 1 Page - Integrated Silicon Solution, Inc |
1 / 11 page IS31LT3938 Preliminary Integrated Silicon Solution, Inc. – www.issi.com R0.1, 04/25/2012 1 High Voltage LED Lighting Driver with Three Level Power Sequencing General Description IS31LT3938 LED driver IC is a peak current detection buck converter which operates in constant off time mode. It operates over a very wide input voltage supply range of 10VDC to 450VDC or 110VAC/220VAC. IS31LT3938 incorporates the special feature of three power sequencing levels by detecting OFF-ON cycles of the main power switch. When the switch is cycled within a 4 second period (typical) the device automatically switches the power level to the next step. As a result, the input and output power of the luminaire may be adjusted depending on the desired amount of illumination and/or power consumption. There are multiple power levels that the engineer may configure, 2 steps or 3 steps, via the external pins DIM1 and DIM2. IS31LT3938 can also realize LED dimming using an external PWM signal. It can accept a PWM signal from 0% to 100% duty cycle. The LED current may also be adjusted linearly by applying an analog input voltage in the range of 0.5V to 2.5V. IS31LT3938 adopts a peak current mode control architecture, which eliminates the need for any additional loop compensation while maintaining a good degree of constant output current regulation. Features User configurable power sequencing levels 3% output current accuracy Over current, temperature protection and short circuit protection High efficiency (typical up to 95%) Higher MOS drive voltage Wide input voltage range: 10VDC~450VDC or 85Vac~ 265Vac Linear and PWM dimming Very few external components Applications DC/DC or AC/DC constant current LED driver Signal and decorative lighting Backlight LED driver Typical Application Circuit Gate CS ADJ TOFF VIN DIM1 DIM2 GND Fuse AC Input LED+ LED- REXT RCS Q1 CIN RIN C1 D5 L1 C3 D1 D2 D3 D4 Switch K IS3938 Copyright © 2011 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances |
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