HT82P604B datasheet(5/7 Pages) HOLTEK

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Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

VCC

Conditions

Lower Threshold

(VSEN/DACOUT)

12V VSEN Falling

Hysteresis

(VSEN/DACOUT)

12V Upper and Lower

Threshold

VPGOOD PGOOD Voltage Low

12V IPGOOD=-5mA

0.5

HT82P604B

March 23, 2000

Preliminary

Functional Description

Output voltage program

The output voltage of a HT82P604B converter

is programmed to discrete levels between 1.3V

and 3.5V. The voltage identification (VID) pins

program an internal voltage reference

(DACOUT) with a 5-bit digital-to-analog con-

verter (DAC). The level of DACOUT also sets

the PGOOD and OVP thresholds. Table 1 speci-

fies the DACOUT voltage for the 32 combina-

tions of open or short connections on the VID

pins. The output voltage should not be adjusted

while the converter is delivering power. Re-

move input power before changing the output

voltage. Adjusting the output voltage during

operation could toggle the PGOOD signal and

exercise the overvoltage protection.

Pin Name

Nominal

Output

Voltage

Dacout

VID4 VID3 VID2 VID1 VID0

01111

1.30

01110

1.35

01101

1.40

01100

1.45

01011

1.50

01010

1.55

01001

1.60

01000

1.65

00111

1.70

00110

1.75

00101

1.80

Pin Name

Nominal

Output

Voltage

Dacout

VID4 VID3 VID2 VID1 VID0

00100

1.85

00011

1.90

00010

1.95

00001

2.00

00000

2.05

11111

11110

2.1

11101

2.2

11100

2.3

11011

2.4

11010

2.5

11001

2.6

11000

2.7

10111

2.8

10110

2.9

10101

3.0

10100

3.1

10011

3.2

10010

3.3

10001

3.4

10000

3.5

Note: 0=connected to GND or VSS, 1=OPEN

Table 1 Output voltage program

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