AIC1569A Просмотр технического описания (PDF) - Analog Intergrations

Номер в каталоге

Компоненты Описание

производитель

AIC1569A

5-bit DAC, Synchronous PWM Power Regulator

Analog Intergrations 

AIC1569A

BLOCK DIAGRAM

VSEN

SS

VID0

VID1

VID2

VID3

VID4

FB

COMP

10µA

115%

110%

90%

50%

+

−

OVP

+

−

POWER GOOD

+

−

+

−

POWER-ON

RESET

+

−

OVER

CURRENT

4V

REFERENCE

VDAC

5-BITS DAC

+

−

ERROR AMP

SOFT

START

CONTROL

LOGIC

+

−

PWM

COMPARATOR

OSCILLATOR

VCC

IOCS

200µA

VCC

OVP

PGOOD

OCSET

PHASE

BOOT

UGATE

GND

LGATE

PGND

RT

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 perform overvoltage

protection function.

PIN 2: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 (IOCS), and the external

MOSFET on-resistance (RDS(ON))

jointly set the over current trip

point according to the following

PIN 3:SS

equation:

IPEAK

=

IOCS × ROCSET

RDS( 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.

- Soft start pin. Connect a capacitor

from this pin to ground. An internal

10µA current source provides soft

start function for the converter.

5

Share Link: