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IS31LT3948 - PFM MODE BOOST LED DRIVER

Description

The IS31LT3948 is a PFM step-up DC-DC converter designed for driving the white LED arrays for large size LCD panel backlighting applications.

It can deliver stable constant output current from a few milliamps up to 2A, programmed via an external resistor.

Features

  • external PWM dimming, which allows the flexible control of the back-lighting luminance. The IS31LT3948 has a wide input voltage range from 5V to 100V (Note). An integrated OVP circuit protects the chip and the system even under no-load conditions. Note: The IS31LT3948 has an internal 5V shunt regulator connected to the VCC pin. A dropping resistor must be connected between the VCC pin and VIN to limit current flow. VIN voltages above 100V are allowed but care must be taken to ensure that the out.

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Datasheet Details

Part number IS31LT3948
Manufacturer ISSI
File Size 502.66 KB
Description PFM MODE BOOST LED DRIVER
Datasheet download datasheet IS31LT3948 Datasheet
Additional preview pages of the IS31LT3948 datasheet.

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Full PDF Text Transcription

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IS31LT3948 PFM MODE BOOST LED DRIVER WITH THE EXTERNAL NMOS OCTOBER 2011 GENERAL DESCRIPTION The IS31LT3948 is a PFM step-up DC-DC converter designed for driving the white LED arrays for large size LCD panel backlighting applications. It can deliver stable constant output current from a few milliamps up to 2A, programmed via an external resistor. The IS31LT3948 utilizes a control scheme in which the output is automatically adjusted to the optimum output voltage for the system, maximizing the efficiency. Furthermore, the control scheme is inherently stable removing the need to provide additional loop compensation. The device features external PWM dimming, which allows the flexible control of the back-lighting luminance. The IS31LT3948 has a wide input voltage range from 5V to 100V (Note).
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