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HIP6006 Fiches technique(PDF) 5 Page - Intersil Corporation |
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HIP6006 Fiches technique(HTML) 5 Page - Intersil Corporation |
5 / 12 page 5 LGATE (Pin 12) Connect LGATE to the lower MOSFET gate. This pin provides the gate drive for the lower MOSFET. PVCC (Pin 13) Provide a bias supply for the lower gate drive to this pin. VCC (Pin 14) Provide a 12V bias supply for the chip to this pin. Functional Description Initialization The HIP6006 automatically initializes upon receipt of power. Special sequencing of the input supplies is not necessary. The Power-On Reset (POR) function continually monitors the input supply voltages and the enable (EN) pin. The POR monitors the bias voltage at the VCC pin and the input voltage (VIN) on the OCSET pin. The level on OCSET is equal to VIN Less a fixed voltage drop (see over-current protection). With the EN pin held to VCC, the POR function initiates soft start operation after both input supply voltages exceed their POR thresholds. For operation with a single +12V power source, VIN and VCC are equivalent and the +12V power source must exceed the rising VCC threshold before POR initiates operation. The Power-On Reset (POR) function inhibits operation with the chip disabled (EN pin low). With both input supplies above their POR thresholds, transitioning the EN pin high initiates a soft start interval. Soft Start The POR function initiates the soft start sequence. An internal 10 µA current source charges an external capacitor (CSS) on the SS pin to 4V. Soft start clamps the error amplifier output (COMP pin) and reference input (+ terminal of error amp) to the SS pin voltage. Figure 3 shows the soft start interval with CSS = 0.1µF. Initially the clamp on the error amplifier (COMP pin) controls the converter’s output voltage. At t1 in Figure 3, the SS voltage reaches the valley of the oscillator’s triangle wave. The oscillator’s triangular waveform is compared to the ramping error amplifier voltage. This generates PHASE pulses of increasing width that charge the output capacitor(s). This interval of increasing pulse width continues to t2. With sufficient output voltage, the clamp on the reference input controls the output voltage. This is the interval between t2 and t3 in Figure 3. At t3 the SS voltage exceeds the reference voltage and the output voltage is in regulation. This method provides a rapid and controlled output voltage rise. Over-Current Protection The over-current function protects the converter from a shorted output by using the upper MOSFETs on-resistance, rDS(ON) to monitor the current. This method enhances the converter’s efficiency and reduces cost by eliminating a current sensing resistor. The over-current function cycles the soft-start function in a hiccup mode to provide fault protection. A resistor (ROCSET) programs the over-current trip level. An internal 200 µA (typical) current sink develops a voltage across ROCSET that is reference to VIN. When the voltage across the upper MOSFET (also referenced to VIN) exceeds the voltage across ROCSET, the over-current function initiates a soft- start sequence. The soft-start function discharges CSS with a 10 µA current sink and inhibits PWM operation. The soft- start function recharges CSS, and PWM operation resumes with the error amplifier clamped to the SS voltage. Should an overload occur while recharging CSS, the soft start function inhibits PWM operation while fully charging CSS to 4V to TIME (5ms/DIV) SOFT-START (1V/DIV) 0V 0V t1 t2 t3 OUTPUT (1V/DIV) VOLTAGE FIGURE 3. SOFT-START INTERVAL 0A 0V TIME (20ms/DIV) 5A 10A 15A 2V 4V FIGURE 4. OVER-CURRENT OPERATION HIP6006 |
Numéro de pièce similaire - HIP6006_05 |
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Description similaire - HIP6006_05 |
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