HIP6301VCB datasheet(10/20 Pages) RENESAS

10 / 20 page

HIP6301V, HIP6302V

FN9034 Rev 3.00

Page 10 of 20

May 5, 2008

function of the Channel Frequency, as explained previously.

Also note the pulses on the COMP terminal. These pulses

are the current correction signal feeding into the comparator

input (see Figure 1).

Figure 5 shows the regulator operating from an ATX supply.

In this figure, note the slight rise in PGOOD as the 5V supply

rises.The PGOOD output stage is made up of NMOS and

PMOS transistors. On the rising VCC, the PMOS device

becomes active slightly before the NMOS transistor pulls

“down”, generating the slight rise in the PGOOD voltage.

Note that Figure 5 shows the 12V gate driver voltage

available before the 5V supply to the controller has reached

its threshold level. If conditions were reversed and the 5V

supply was to rise first, the start-up sequence would be

different. In this case the controller may sense an

overcurrent condition due to charging the output capacitors.

The supply would then restart and go through the normal

soft-start cycle.

Dynamic VID

The HIP6301V and HIP6302V require up to two full clock

cycles to detect a change in the VID code. VID code

changes that are not valid for at least two cycles may or may

not be detected. Once detected, the controller waits an

additional two-cycle wait period to be certain the change is

stable. After the two-cycle wait period, the DAC begins

stepping toward the new VID setting in 25mV increments.

The DAC makes one 25mV step every two clock cycles. For

example, a 500kHz system detecting a change from 1.300V

to 1.800V requires between 84ms and 88ms to complete the

change.

If a new VID code is detected during a DAC change and the

DAC can continue toward the new VID code without

changing direction, processing continues without

interruption. If a new VID code is detected during a DAC

change and the DAC has to change direction in order to

proceed toward then new VID code, processing halts. A

two-cycle wait period is initiated and processing continues

as above. These decisions are made with reference to the

transitional DAC value rather than the original target value.

PWM 1

PGOOD

VCORE

OUTPUT

VCC

VIN = 12V

DELAY TIME

FIGURE 3. START-UP OF 4-PHASE SYSTEM OPERATING

AT 500kHz

PGOOD

VCORE

V COMP

VCC

VIN = 12V

DELAY TIME

FIGURE 4. START-UP OF 4-PHASE SYSTEM OPERATING

AT 200kHz

12V ATX

SUPPLY

PGOOD

5V ATX

VCORE

SUPPLY

ATX SUPPLY ACTIVATED BY ATX “PS-ON PIN”

VIN = 5V, CORE LOAD CURRENT = 31A

FIGURE 5. SUPPLY POWERED BY ATX SUPPLY

FREQUENCY 200kHz

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