HIP6012 datasheet(4/12 Pages) RENESAS

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 200A 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

100

1000

SWITCHING FREQUENCY (kHz)

100

1000

RT PULLUP

TO +12V

RT PULLDOWN

TO VSS

100

200

300

400

500

600

700

800

900

1000

SWITCHING FREQUENCY (kHz)

CGATE = 1000pF

CGATE = 3300pF

CGATE = 10pF

OCSET

COMP

VCC

LGATE

PGND

BOOT

UGATE

PHASE

GND

PVCC

Fs 200kHz

510



------------------



(RT to GND)

Fs 200kHz

410



------------------

–



(RT to 12V)

IPEAK

IOCS ROCSET



rDS ON



--------------------------------------------

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