HIP6301VCBZ datasheet(12/20 Pages) INTERSIL

12 / 20 page

FN9034.2

December 27, 2004

At the end of the delay, PWM outputs are restarted and the

soft-start ramp is initiated. If a short is present at that time,

the cycle is repeated. This is the hiccup mode.

Figure 8 shows the supply shorted under operation and the

hiccup operating mode described above. Note that due to

the high short circuit current, overcurrent is detected before

completion of the start-up sequence so the delay is not quite

as long as the normal soft-start cycle.

CORE Voltage Programming

The voltage identification pins (VID0, VID1, VID3, and VID4)

set the CORE output voltage. Each VID pin is pulled to 2.5V by

an internal 20

µA current source and accepts open-collector/

open-drain/open-switch-to-ground or standard low-voltage

TTL or CMOS signals.

Table 1 shows the nominal DAC voltage as a function of the

VID codes. The power supply system is

±0.8% accurate over

the operating temperature and voltage range.

TABLE 1. VOLTAGE IDENTIFICATION CODES

VID4

VID3

VID2

VID1

VID0

VDAC

111

Off

111

1.100

111

1.125

111

1.150

110

1.175

110

1.200

110

1.225

110

1.250

101

1.275

101

1.300

101

1.325

PGOOD

SHORT

50A/Div

CURRENT

ATX SUPPLY ACTIVATED BY ATX “PS-ON PIN”

SUPPLY FREQUENCY = 200kHz, V IN = 12V

HICCUP MODE. SUPPLY POWERED BY ATX SUPPLY

CORE LOAD CURRENT = 31A, 5V LOAD = 5A

SHORT APPLIED HERE

FIGURE 8. SHORT APPLIED TO SUPPLY AFTER POWER-UP

101

1.350

100

1.375

100

1.400

100

1.425

100

1.450

011

1.475

011

1.500

011

1.525

011

1.550

010

1.575

010

1.600

010

1.625

010

1.650

001

1.675

001

1.700

001

1.725

001

1.750

000

1.775

000

1.800

000

1.825

000

1.850

TABLE 1. VOLTAGE IDENTIFICATION CODES (Continued)

VID4

VID3

VID2

VID1

VID0

VDAC

HIP6301V, HIP6302V

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