HIP6004E Datasheet(数据表) 4 Page

4 page

Functional Pin Descriptions

VSEN (Pin 1)

This pin is connected to the converter’s output voltage. The

PGOOD and OVP comparator circuits use this signal to

report output voltage status and for overvoltage protection.

OCSET (Pin 2)

Connect a resistor (ROCSET) from this pin to the drain of the

upper MOSFET. ROCSET, an internal 200µA current source

(IOCSET), and the upper MOSFET on-resistance (rDS(ON))

set the converter overcurrent (OC) trip point according to the

following equation:

An over-current trip cycles the soft-start function.

SS (Pin 3)

Connect a capacitor from this pin to ground. This capacitor,

along with an internal 10

µA current source, sets the soft-

start interval of the converter.

VID25mV-VID3 (Pins 4-8)

VID25mV - VID3 are the input pins to the 5-bit DAC. The

states of these five pins program the internal voltage

reference (DACOUT). The level of DACOUT sets the

converter output voltage. It also sets the PGOOD and OVP

thresholds. Table 1 specifies DACOUT for the all

combinations of DAC inputs.

COMP (Pin 9) and FB (Pin 10)

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.

GND (Pin 11)

Signal ground for the IC. All voltage levels are measured with

respect to this pin.

PGOOD (Pin 12)

PGOOD is an open collector output used to indicate the

status of the converter output voltage. This pin is pulled low

when the converter output is not within

±10% of the

DACOUT reference voltage.

PHASE (Pin 13)

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 14)

Connect UGATE to the upper MOSFET gate. This pin

provides the gate drive for the upper MOSFET.

BOOT (Pin 15)

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 = 3300pF

CGATE = 1000pF

CGATE = 10pF

CUPPER = CLOWER = CGATE

VSEN

OCSET

VID25mV

VID0

VID1

VID3

VID2

COMP

VCC

LGATE

PGND

OVP

BOOT

UGATE

PHASE

PGOOD

GND

PEAK

OCSET x ROCSET

DS ON

()

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HIP6004E

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