RS6513 datasheet(4/7 Pages) ORISTER

4 / 7 page

Page No. : 4/7

DS-RS6513-03

Oct, 2007

www.Orister.com

Function Description

PWM Control

The RS6513 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of

the RS6513, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage

produced by the switching can easily be removed through a filter because the switching frequency remains

constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load

current.

Under Voltage Lockout

The under voltage lockout circuit of the RS6513 assures that the high-side MOSFET driver outputs remain in the

off state whenever the supply voltage drops below 3.3V. Normal operation resumes once VCC rises above 3.5V.

RDS(ON) Current Limiting

The current limit threshold is setting by the external resistor connecting from VCC supply to OCSET. The internal

100uA sink current crossing the resistor sets the voltage at the pin of OCSET. When the PWM voltage is less than

the voltage at OCSET, an over-current condition is triggered.

ILOAD× RDS(ON) =IOCSET ×ROCSET

See above formula for setting the current limit value.

RS6513 Datasheet(PDF) 4 Page - Orister Corporation