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HIP6012CVZ Datasheet(PDF) 4 Page - Renesas Technology Corp |
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HIP6012CVZ Datasheet(HTML) 4 Page - Renesas Technology Corp |
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4 / 12 page  HIP6012 FN4324 Rev.2.00 Page 4 of 12 December 27, 2004 Functional Pin Descriptions RT (Pin 1) This pin provides oscillator switching frequency adjustment. By placing a resistor (RT) from this pin to GND, the nominal 200kHz switching frequency is increased according to the following equation: Conversely, connecting a pull-up resistor (RT) from this pin to VCC reduces the switching frequency according to the following equation.: OCSET (Pin 2) Connect a resistor (ROCSET) from this pin to the drain of the upper MOSFET. ROCSET, an internal 200A current source (IOCS), and the upper MOSFET on-resistance (rDS(ON)) set the converter overcurrent (OC) trip point according to the following equation: An overcurrent trip cycles the soft-start function. SS (Pin 3) Connect a capacitor from this pin to ground. This capacitor, along with an internal 10 A current source, sets the soft-start interval of the converter. COMP (Pin 4) and FB (Pin 5) COMP and FB are the available external pins of the error amplifier. The FB pin is the inverting input of the error amplifier and the COMP pin is the error amplifier output. These pins are used to compensate the voltage-control feedback loop of the converter. EN (Pin 6) This pin is the open-collector enable pin. Pull this pin below 1V to disable the converter. In shutdown, the soft start pin is discharged and the UGATE and LGATE pins are held low. GND (Pin 7) Signal ground for the IC. All voltage levels are measured with respect to this pin. PHASE (Pin 8) Connect the PHASE pin to the upper MOSFET source. This pin is used to monitor the voltage drop across the MOSFET for overcurrent protection. This pin also provides the return path for the upper gate drive. UGATE (Pin 9) Connect UGATE to the upper MOSFET gate. This pin provides the gate drive for the upper MOSFET. BOOT (Pin 10) This pin provides bias voltage to the upper MOSFET driver. A bootstrap circuit may be used to create a BOOT voltage suitable to drive a standard N-Channel MOSFET. Typical Performance Curves FIGURE 1. RT RESISTANCE vs FREQUENCY FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY 10 100 1000 SWITCHING FREQUENCY (kHz) 10 100 1000 RT PULLUP TO +12V RT PULLDOWN TO VSS 100 200 300 400 500 600 700 800 900 1000 80 70 60 50 40 30 20 10 0 SWITCHING FREQUENCY (kHz) CGATE = 1000pF CGATE = 3300pF CGATE = 10pF 8 9 10 11 12 13 14 7 6 5 4 3 2 1 OCSET SS EN COMP FB RT VCC LGATE PGND BOOT UGATE PHASE GND PVCC Fs 200kHz 510 6 RT ------------------ + (RT to GND) Fs 200kHz 410 7 RT ------------------ – (RT to 12V) IPEAK IOCS ROCSET rDS ON -------------------------------------------- = |
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