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HIP6311 Datasheet(PDF) 10 Page - Renesas Technology Corp

Part No. HIP6311
Description  Microprocessor CORE Voltage Regulator Multi-Phase Buck PWM Controller
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HIP6311 Datasheet(HTML) 10 Page - Renesas Technology Corp

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HIP6311
FN4817 Rev 3.00
Page 10 of 17
December 27, 2004
back through the lower MOSFETs, avoiding a possibly
destructive ringing of the capacitors and output inductors. If
the conditions that caused the over-voltage still persist, the
PWM outputs will be cycled between three state and VCORE
clamped to ground, as a hysteretic shunt regulator.
Under-Voltage
The VSEN pin also detects when the CORE voltage falls more
than 10% below the VID programmed level. This causes
PGOOD to go low, but has no other effect on operation and is
not latched. There is also hysteresis in this detection point.
Over-Current
In the event of an over-current condition, the over-current
protection circuit reduces the average current delivered to
less than 25% of the current limit. When an over-current
condition is detected, the controller forces all PWM outputs
into a three state mode. This condition results in the gate
driver removing drive to the output stages.The HIP6311 goes
into a wait delay timing cycle that is equal to the Soft-Start
ramp time. PGOOD also goes “low” during this time due to
VSEN going below its threshold voltage.To lower the
average output dissipation, the Soft-Start initial wait time is
increased from 32 to 2048 cycles, then the Soft-Start ramp is
initiated. At a PWM frequency of 200kHz, for instance, an
over-current detection would cause a dead time of 10.24ms,
then a ramp of 10.08ms.
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 6 shows the supply shorted under operation and the
hiccup operating mode described above. Note that due to
the high short circuit current, over-current 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 VCC
by an internal 20
A 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.
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 6. SHORT APPLIED TO SUPPLY AFTER POWER-UP
TABLE 1. VOLTAGE IDENTIFICATION CODES
VID4
VID3
VID2
VID1
VID0
VDAC
111
11
Off
111
10
1.100
111
01
1.125
111
00
1.150
110
11
1.175
110
10
1.200
110
01
1.225
110
00
1.250
101
11
1.275
101
10
1.300
101
01
1.325
101
00
1.350
100
11
1.375
100
10
1.400
100
01
1.425
100
00
1.450
011
11
1.475
011
10
1.500
011
01
1.525
011
00
1.550
010
11
1.575
010
10
1.600
010
01
1.625
010
00
1.650
001
11
1.675
001
10
1.700
001
01
1.725
001
00
1.750
000
11
1.775
000
10
1.800
000
01
1.825
000
00
1.850


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