IS31LT3948-GRLS4-EB: 5 ~ 100V in, 2A @ 45V Max, Non-Isolated Output LED Driver

Summary

IS31LT3948 is a PFM step-up DC-DC converter designed for driving the white LED arrays for large size LCD panel backlighting applications. With internal OVP circuit, the chip and the system can be safe even if the load is not connected. The device features external PWM dimming or DC dimming, which allows the flexible control of the backlighting luminance. IS31LT3948 incorporates a unique FB scheme which automatically adjusts the integrated DC/DC converter to the optimum output voltage for the system, maximizing the efficiency.

IS31LT3948 general DEMO board is used in general lamp.

Features:

  • Wide input voltage range: 5V~100V

  • Constant Current Output limited only by external component selection (Note)

  • No loop compensation required

  • Internal over-voltage protection

  • Internal over-temperature protection

Specifications

Manufacturer ISSI, Integrated Silicon Solution Inc
Category Lighting
Sub-Category LED Drivers - DC In
Eval Board Part Number 2521-IS31LT3948-GRLS4-EB-ND
Eval Board Supplier Lumissil Microsystems
Eval Board Board not Stocked
Voltage In 5 ~ 100 V
Topology Step Up
Current Out 2 A
Voltage Out (Max) 45 V
Outputs and Type 1 Non-Isolated
Efficiency @ Conditions >89%, 12 ~ 30V in, 36V @ 2 A
Features Over Voltage Protection
Thermal Protection
Switching Frequency 20 ~ 200 kHz
Component Count + Extras 14 + 8
Design Author ISSI
Application / Target Market Automotive
Lighting: LED Street Lighting
Main I.C. Base Part IS31LT3948
Date Created By Author 2016-01
Date Added To Library 2024-09

Eval Board

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Support Documents & Media

IS31LT3948-GRLS4-EB - User Guide IS31LT3948 - Datasheet

Media

IS31LT3948-GRLS4-EB - Schematic IS31LT3948-GRLS4-EB - Board IS31LT3948-GRLS4-EB - Supply Voltage vs. Efficiency (Figure 4) IS31LT3948-GRLS4-EB - Supply Voltage vs. Efficiency (Figure 5) IS31LT3948-GRLS4-EB - Output Voltage vs. Efficiency (Figure 8) IS31LT3948-GRLS4-EB - Output Voltage vs. Efficiency (Figure 9)