SS6580L datasheet(6/8 Pages) SSC

부품명	SS6580L

상세설명	Step-Down DC/DC Controller with Shutdown

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제조업체	SSC [Silicon Standard Corp.]

홈페이지	http://www.siliconstandard.com

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SS6580/L

n BLOCK DIAGRAM

-

+

-

+

SD

Oscillator

PWM Comparator

Error AMP

COMP

FB

REF

VCC

PHASE

OCSET

UGATE

GND

200

µA

Over Current

Built-In Soft Start

Gate Control

Power-On

Reset

-

+

n PIN DESCRIPTIONS

PIN 1: OCSET - Current limit sense pin. Connect a

resistor ROCSET from this pin to the

drain of the external MOSFET.

ROCSET, an internal 200µA current

source (IOCSET), and the external

MOSFET on-resistance (RDS(ON))

jointly set the over-current trip point

according

to

the

following

equation:

I

R

PEAK

OCSET

DS(ON

=

×

)

If the FB pin voltage is sensed to

be below 50% of the internal

voltage

reference

VDAC,

the

over-current comparator cycles the

soft-start function.

PIN 2: SD

- Shutdown pin. Connect this pin to

ground for shutdown.

PIN 3:COMP

- External compensation pin. This

pin is connected to the error

amplifier

output

and

PWM

comparator. An RC network is

connected

to

the

FB

to

compensate

the

voltage-control

feedback loop of the converter.

PIN 4: FB

- The error amplifier inverting input

pin. The FB pin and COMP pin are

used

to

compensate

the

voltage-control feedback loop.

PIN 5: GND

- Ground pin.

PIN 6: PHASE - Over-current

detection

pin.

Connect the PHASE pin to the

source of the external N-MOSFET.

This pin detects the voltage drop

across the MOSFET RDS(ON) for

over-current protection.

PIN 7: UGATE - External MOSFET gate drive pin.

Connect this pin to the gate of the

external MOSFET.

PIN 8: VCC

- The

chip

power

supply

pin.

Recommended supply voltage is

12V.

Rev.2.01 6/26/2003

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SS6580L 데이터시트(PDF) 6 Page - Silicon Standard Corp.

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