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AP1520

Anachip Corporation
Part Number AP1520
Manufacturer Anachip Corporation
Description PWM Control 2A Step-Down Converter
Published Jan 26, 2007
Detailed Description www.DataSheet4U.com AP1520 PWM Control 2A Step-Down Converter „ Features - Input voltage: 3.6V to 23V. - Output voltage...
Datasheet PDF File AP1520 PDF File

AP1520
AP1520

Overview
www.
DataSheet4U.
com AP1520 PWM Control 2A Step-Down Converter „ Features - 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 MOS - SOP-8L Pb-Free Package.
„ General Description AP1520 consists of step-down switching regulator with PWM control.
These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc.
AP1520 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 circuit 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 30KHz.
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 SOP–8L 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.
„ Applications - 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 Assignments „ Pin Descriptions Name FB Pin Description 1 Feedback pin.
Power-off pin H: Normal operation (Step-down operation) 2 L: Step-down operation stopped (All circuits deactivated) Add an ext...


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