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AIC1580CN

Simple PWM Power Regulator with Shutdown

Analog Intergrations 

BLOCK DIAGRAM

AIC1580/L

SD

Built-In Soft Start

Over Current

-

+

200µA

PHASE

OCSET

Power-On

Reset

VCC

FB

COMP

+

PWM Comparator

-

+

Gate Control

REF

Error AMP

-

Oscilator

UGATE

GND

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 overcurrent trip point

according to the following

equation:

IPEAK

=

IOCSET × ROCSET

RDS(ON)

If FB pin voltage is sensed to be

below 50% of the internal

voltage reference VDAC, the

overcurrent 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 error

amplifier output and PWM

comparator. A RC network is

connected to FB pin 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-

Overcurrent detection pin.

Connect the PHASE pin to

source of the external N-

MOSFET. This pin detects the

voltage drop across the

MOSFET RDS(ON) for overcurrent

protection.

PIN 7: UGATE- External MOSFET gate drive pin.

Connect this pin to gate of the

external MOSFET.

PIN 8: VCC

-The chip power supply pin.

Recommended supply voltage is

12V.

6

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