PDF AP1534 Data sheet ( Hoja de datos )

Número de pieza	AP1534
Descripción	PWM CONTROL 2A STEP-DOWN CONVERTER
Fabricantes	Diodes Incorporated
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No Preview Available ! AP1534 PWM CONTROL 2A STEP-DOWN CONVERTER Description Pin Assignments AP1534 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS. AP1534 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 99%. 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 50KHz. Also, an internal compensation block is built in to minimize 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 SO-8 mini-packages, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 18V, it is also suitable for the operation via an AC adapter. (Top View) FB 1 8 VSS EN 2 AP1534 7 VSS OCSET 3 6 Output VCC 4 5 Output SO-8 Features Applications • Input voltage: 3.6V to 18V • Output voltage: 0.8V to VCC • Duty ratio: 0% to 99% PWM control • Oscillation frequency: 300KHz typical • Current limit, Enable function • Thermal Shutdown function • Built-in internal SW P-channel MOS • SO-8: Available in “Green” Molding Compound (No Br, Sb) • Lead Free Finish/RoHS Compliant (Note 1) • PC Motherboard • LCD Monitor • Graphic Card • DVD-Video Player • Telecom Equipment • ADSL Modem • Printer and other Peripheral Equipment • Microprocessor Core Supply Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. Typical Application Circuit VIN Vcc Output CIN 470uF R OCSET COCSET 5.6K Option CVcc 0. 1uF REN 100K CEN 0.1uF AP1534 OCSET FB EN VSS 22uH L1 CC Optional D1 B240A (Note 2) VOUT =5V/2A RA 6.8K + - RB 1.3K C+ 0.1uF- COUT 470uF Notes: 2. Suggested DIODES Power Schottky P/N: B240/B340 series. Note: VOUT = VFB x (1+RA /RB) RB = 0.7K~5KΩ AP1534 Document number: DS31314 Rev. 6 - 2 1 of 9 www.diodes.com April 2011 © Diodes Incorporated 1 page AP1534 PWM CONTROL 2A STEP-DOWN CONVERTER Typical Performance Characteristics (cont.) VOUT Ripple (VIN = 5V, VOUT = 3.3V, IOUT = 0.1A) VOUT Ripple (VIN = 5V, VOUT = 3.3V, IOUT = 2A) Test Circuit open VCC OUTPUT OCSET FB open A EN VSS Enable function test A VCC OUTPUT FB + OCSET - EN VSS Feedback function test VCC OUTPUT FB + OCSET - EN VSS Operation function test +V - AP1534 Document number: DS31314 Rev. 6 - 2 5 of 9 www.diodes.com April 2011 © Diodes Incorporated 5 Page

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