AIC1567CS datasheet(6/7 Pages) AIC

6 / 7 page

AIC1567

PIN DESCRIPTIONS

PIN 1: VSEN

- Converter output voltage sense

pin. Connect this pin to the

converter output. The PGOOD

and OVP comparator circuits use

this signal to report output

voltage

status

and

for

overvoltage protection function.

PIN 2: OCSET - Current limit sense pin. Connect

a resistor R

OCSET from this pin to

the

drain

the

external

MOSFET. R

OCSET,

an internal

200

µA current source (IOCS), and

the

external

MOSFET

on-

resistance (RDS(ON)) jointly set

the

over

current

trip

point

according

the

following

equation:

PEAK

OCS

OCSET

DS ON

()

If 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 3: SS

- Soft

start

pin.

Connect

capacitor from this pin to ground.

An internal 10

µA current source

provides soft start function for

the converter.

PIN 4: VID0

PIN 5: VID1

PIN 6: VID2

PIN 7: VID3

PIN 8: VID4

- 5-bit DAC voltage select pin. TTL

inputs used to set the internal

voltage reference VDAC. When

left

open,

these

pins

are

internally pulled up to 5V and

provide logic ones. The level of

VDAC sets the converter output

voltage as well as the PGOOD

and OVP thresholds.

Table 1 specifies the VDAC

voltage for the 32 combinations

of DAC inputs.

PIN 9: COMP - External compensation pin. This

connected

error

amplifier

output

and

PWM

comparator. An RC network is

connected

compensate the voltage-control

feedback loop of the converter.

PIN 10: FB

- The error amplifier inverting

input pin. The FB pin and COMP

pin are used to compensate the

voltage-control feedback loop.

PIN 11: CLP

- Linear regulator current sense

pin. This pin is the positive input

of the current sense comparator.

PIN 12: CLN

- Linear regulator current sense

pin. This pin is the negative input

of the current sense comparator.

PIN 13: VLFB - Negative feedback pin for the

linear regulator error amplifier.

PIN 14: LIDRI - Linear regulator output drive pin.

This pin can drive either a

Darlington NPN or an N-channel

MOSFET.

PIN 15: GND

- Signal GND. It also serves as

the power GND for the upper

gate driver.

PIN 16: PGOOD-Power

good

indicator

pin.

PGOOD is an open drain output.

This pin is pulled low when the

converter output is

±10% out of

the VDAC reference voltage.

Table 1. Output Voltage Program

VID4

VID3

VID2

VID1

VID0

VDAC

1000

3.5V

1000

3.4V

1001

3.3V

1001

3.2V

1010

3.1V

1010

3.0V

1011

2.9V

1011

2.8V

1100

2.7V

1100

2.6V

1101

2.5V

1101

2.4V

1110

2.3V

1110

2.2V

AIC1567CS Datasheet(PDF) 6 Page - Analog Intergrations Corporation

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