TS2508CSRL datasheet(3/8 Pages) TSC

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TS2508

2A / 330KHz PWM Buck Converter

3/8

Version: B07

Application Circuit

Typical Circuit

L1 recommend value (VIN=12V, IOUT=2A )

VOUT

1.8V

2.5V

3.3V

L1 Value

18uH

22uH

27uH

33uH

Function Descriptions

PWM Control

The TS2508 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the

TS2508, 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.

RDS(ON) Current Limiting

The current limit threshold is setting by the external resistor (R3) connecting from VCC supply to OCSET pin. The

internal 110uA sink current crossing the resistor sets the voltage at pin of OCSET. When the PWM voltage is less than

the voltage at OCSET, an over-current condition is triggered. Please refer to the formula for setting the minimum

current limit value:

(Normally, The ISW(MAX) setting more than IOUT 1.2A)

Example: ISW=(0.11mA * 2k + 0.08) / 70mΩ = 3.2A – (VIN=12V)

ISW=(0.11mA * 3.3k + 0.08) / 1000mΩ = 3.5A – (VIN=5V)

TS2508CSRL Datasheet(PDF) 3 Page - Taiwan Semiconductor Company, Ltd