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FSP3131

ViviChip
Part Number FSP3131
Manufacturer ViviChip
Description PWM Controller 3A Step-Down Converter
Published Sep 29, 2008
Detailed Description FSP3131 PWM CONTROL 3A STEP-DOWN CONVERTER „ FEATURES z z z z z z z z z z z z z z z z z z Input voltage: 3.6V to 23V. Ou...
Datasheet PDF File FSP3131 PDF File

FSP3131
FSP3131

Overview
FSP3131 PWM CONTROL 3A STEP-DOWN CONVERTER „ FEATURES z z z z z z z z z z z z z z z z z z Input voltage: 3.
6V to 23V.
Output voltage: 0.
8V to VCC.
Duty ratio: 0% to 100% PWM control Oscillation frequency: 300KHz typ.
Soft-start, Current limit, Enable function Thermal Shutdown function Built-in internal SW P-channel MOSFET SOP8L Package.
„ GENERAL DESCRIPTION FSP3131 consists of step-down switching regulator with PWM control.
These devices include a reference voltage source, oscillation circuit, error amplifier and internal PMOS.
FSP3131 provides low-ripple power, high efficiency, and excellent transient characteristics.
The PWM control circuit is able to vary the duty ratio linearly from 0 up to 100%.
This converter also contains an error amplifier circuit as well as a soft-start circuir that prevents overshoot at startup.
An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300KHz to 50KHz.
Also, an internal compensation block is built in to minimum external component count.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators.
They serve as ideal power supply units for portable devices when coupled with the SOP8L mini-package, providing such outstanding features as low current consumption.
Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter.
„ TYPICAL www.
DataSheet4U.
com APPLICATION Cellular Phones PC Motherboard LCD Monitor Graphic Card DVD-Video Player Telecom Equipment ADSL Modem Printer and other Peripheral Equipment Microprocessor core supply Networking power supply „ PIN ASSIGNMENT (Top View) FB 1 EN 2 OCSET 3 VCC 4 8 VSS 7 VSS 6 OUTPUT 5 OUTPUT „ PIN DESCRIPTION Pin Number Pin Name 1 2 3 4 5,6 7,8 FB EN OCSET VCC OUTPUT VSS Feedback Pin Enable In...


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