AIC1568 查看數據表（PDF） - Analog Intergrations

零件编号

产品描述 (功能)

比赛名单

AIC1568

4-bit DAC, Simple PWM Power Regulator

Analog Intergrations 

BLOCK DIAGRAM

VSEN

SS

115%

110%

+

=-

OVP

90%

=+-

POWER GOOD

+-

50%

+

1µA

-

POW ER-ON

RESET

−

+

OVER

CURRENT

4V

VID0

VID1

VID2

VID3

FB

COMP

REFERENCE

VDAC

4BITS

DAC

+

-

ERROR

AMP

SOFT

SATRT

+

+

CONTROL

LOGIC

−

PW M

COMPARATOR

OSCILLATOR

AIC1568

VCC

PGOOD

OCSET

IOCSET

200µA

PHASE

BOOT

UGATE

GND

RT/OVP

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 200

µA current source (IOCSET), and

the external MOSFET on-

resistance (RDS(ON)) jointly set the

over current 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

over current comparator cycles

the soft-start function.

PIN 2: SS

- Soft start pin. Connect a

capacitor from this pin to ground.

PIN 3: VID0

PIN 4: VID1

PIN 5: VID2

PIN 6: VID3

An internal 10µA current source

provides soft start function for

the converter.

-

-

-

- 4-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 16 combinations

of DAC inputs.

5

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