HIP6013 データシートの表示（PDF） - Intersil

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HIP6013

Buck Pulse-Width Modulator (PWM) Controller

Intersil 

HIP6013

Typical Performance Curves

1000

100

10

RT PULLUP

TO +12V

RT PULLDOWN

TO VSS

10

100

SWITCHING FREQUENCY (kHz)

FIGURE 1. RT RESISTANCE vs FREQUENCY

1000

Functional Pin Description

RT 1

OCSET 2

SS 3

COMP 4

FB 5

EN 6

GND 7

14 VCC

13 NC

12 NC

11 NC

10 BOOT

9 UGATE

8 PHASE

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:

Fs ≈ 200kHz + -5----•-----1---0----6-

RT

(RT to GND)

Conversely, connecting a pull-up resistor (RT) from this pin to

VCC reduces the switching frequency according to the

following equation.:

Fs ≈ 200kHz – 4-----•-----1---0----7-

RT

(RT to 12V)

OCSET (Pin 2)

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

upper MOSFET. ROCSET, an internal 200µA current source

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

the converter over-current (OC) trip point according to the

following equation:

IPEAK

=

I--O-----C----S-----•----R-----O----C-----S----E---T--

rDS(ON)

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

40

35

CGATE = 3300pF

30

25

20

CGATE = 1000pF

15

10

5

CGATE = 10pF

0

100 200 300 400 500 600 700 800 900 1000

SWITCHING FREQUENCY (kHz)

FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY

SS (Pin 3)

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

along with an internal 10µA 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 over-current 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.

VCC (Pin 14)

Provide a 12V bias supply for the chip to this pin.

4

4325.1

November 3, 2005

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