5

Functional Pin Descriptions

This pin is connected to the converters output voltage. The

PGOOD and OVP comparator circuits use this signal to

report output voltage status and for overvoltage protection.

OCSET (Pin 2)

the converter over-current (OC) trip point according to the

following equation:

An over-current trip cycles the soft-start function.

SS (Pin 3)

Connect a capacitor from this pin to ground. This capacitor,

along with an internal 10

µA current source, sets the soft-

start interval of the converter.

VID0-4 (Pins 4-8)

VID0-4 are the input pins to the 5-bit DAC. The states of

these five pins program the internal voltage reference

(DACOUT). The level of DACOUT sets the converter output

voltage. It also sets the PGOOD and OVP thresholds. Table

1 specifies DACOUT for the all combinations of DAC inputs.

COMP (Pin 9) and FB (Pin 10)

COMP and FB are the available external pins of the error

amplifier. The FB pin is the inverting input of the error

amplifier and the COMP pin is the error amplifier output.

These pins are used to compensate the voltage-control

feedback loop of the converter.

POWER GOOD

106

-

111

%

89

-

94

%

Upper and Lower Threshold

-

2

-

%

PGOOD Voltage Low

-

0.5

-

V

Electrical Specifications

Recommended Operating Conditions, Unless Otherwise Noted (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Typical Performance Curves

FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY

10

100

1000

SWITCHING FREQUENCY (kHz)

10

100

1000

TO +12V

100

200

300

400

500

600

700

800

900

1000

SWITCHING FREQUENCY (kHz)

80

70

60

50

40

30

20

10

0

11

12

13

14

15

16

17

18

20

19

10

9

8

7

6

5

4

3

2

1

OCSET

SS

VID0

VID1

VID2

VID4

VID3

COMP

FB

RT

VCC

LGATE

PGND

OVP

BOOT

UGATE

PHASE

PGOOD

GND

I

PEAK

I

r

DS ON

()

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HIP6004B