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HIP6301 Datasheet(PDF) 10 Page - Intersil Corporation |
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HIP6301 Datasheet(HTML) 10 Page - Intersil Corporation |
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10 / 16 page  10 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 HIP6301 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 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 ±1% accurate over the operating temperature and voltage range. PGOOD SHORT 50A/Div CURRENT ATX SUPPLY ACTIVATED BY ATX “PS-ON PIN” SUPPLY FREQUENCY = 200kHz, VIN = 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 11111 Off 11110 1.100 11101 1.125 11100 1.150 11011 1.175 11010 1.200 11001 1.225 11000 1.250 10111 1.275 10110 1.300 10101 1.325 10100 1.350 10011 1.375 10010 1.400 10001 1.425 10000 1.450 01111 1.475 01110 1.500 01101 1.525 01100 1.550 01011 1.575 01010 1.600 01001 1.625 01000 1.650 00111 1.675 00110 1.700 00101 1.725 00100 1.750 00011 1.775 00010 1.800 00001 1.825 00000 1.850 HIP6301 HIP6301 |
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