RS6514 Datasheet, PDF (1/8 Pages) Orister Corporation – PWM Control 4A Step-Down Converter

Page No. : 1/8
RS6514
PWM Control 4A Step-Down Converter
RS6514 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 350KHz 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–8/EP (Exposed Pad) mini-package, providing such outstanding features as low current
consumption. Since this converter can accommodate an input voltage up to 20V, it is also suitable for the operation
via an AC adapter.
Features
• Input voltage: 3.6V to 20V.
• Output voltage: 0.8V to V_CC.
• Duty ratio: 0% to 100% PWM control
• Oscillation frequency: 350KHz typ.
• Soft-start, Current limit, Enable function
• Thermal Shutdown function
• Built-in internal SW P-channel MOS
• SOP-8L Pb-Free Package.
.
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 Configurations
Pin 1: Feedback pin.
Pin 2: Power-off pin
H: Normal operation
(Step-down operation)
L: Step-down operation stopped
(All circuits deactivated)
Pin 3: Add an external resistor to set
max output current
Pin 4: IC power supply pin
Pin 5: Output Pin. Connect external
inductor/diode here. Minimize trace area at
this pin to reduce EMI
Pin 6: Output Pin. Connect external
inductor/diode here. Minimize trace area at
this pin to reduce EMI
Pin 7, 8: GND Pin
Pin 9: Output Pin (Exposed Pad). Must be
connected to bare copper ground plane.
DS-RS6514-02 March, 2009
www.Orister.com