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HIP6301CB-T Datasheet(PDF) 10 Page - Intersil Corporation |
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HIP6301CB-T Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 17 page 10 FN4765.6 December 27, 2004 Fault Protection The HIP6301 protects the microprocessor and the entire power system from damaging stress levels. Within the HIP6301 both Overvoltage and Overcurrent circuits are incorporated to protect the load and regulator. Overvoltage The VSEN pin is connected to the microprocessor CORE voltage. A CORE overvoltage condition is detected when the VSEN pin goes more than 15% above the programmed VID level. The overvoltage condition is latched, disabling normal PWM operation, and causing PGOOD to go low. The latch can only be reset by lowering and returning VCC high to initiate a POR and Soft-Start sequence. During a latched overvoltage, the PWM outputs will be driven either low or three state, depending upon the VSEN input. PWM outputs are driven low when the VSEN pin detects that the CORE voltage is 15% above the programmed VID level. This condition drives the PWM outputs low, resulting in the lower or synchronous rectifier MOSFETs to conduct and shunt the CORE voltage to ground to protect the load. If after this event, the CORE voltage falls below the overvoltage limit (plus some hysteresis), the PWM outputs will three state. The HIP6601B family drivers pass the three state information along, and shuts off both upper and lower MOSFETs. This prevents “dumping” of the output capacitors back through the lower MOSFETs, avoiding a possibly destructive ringing of the capacitors and output inductors. If the conditions that caused the overvoltage still persist, the PWM outputs will be cycled between three state and VCORE clamped to ground, as a hysteretic shunt regulator. Undervoltage 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. Overcurrent In the event of an overcurrent condition, the overcurrent protection circuit reduces the average current delivered to less than 25% of the current limit. When an overcurrent 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 overcurrent 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, overcurrent is detected before completion of the start-up sequence so the delay is not quite as long as the normal Soft-Start cycle. 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 HIP6301 HIP6301 |
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