HIP6012 Intersil Corporation, HIP6012 Datasheet - Page 4

• Manufacturer Part Number: HIP6012
• Description: Buck and Synchronous-Rectifier Pulse-Width Modulator (PWM) Controller
• Manufacturer: Intersil Corporation

Typical Performance Curves
Functional Pin Description
RT (Pin 1)
This pin provides oscillator switching frequency adjustment.
By placing a resistor (R
200kHz switching frequency is increased according to the
following equation:
Conversely, connecting a pull-up resistor (R
to V
following equation.:
OCSET (Pin 2)
Connect a resistor (R
upper MOSFET. R
the converter over-current (OC) trip point according to the
following equation:
I
An over-current trip cycles the soft-start function.
(I
Fs 200kHz
Fs 200kHz
PEAK
OCS
CC
1000
100
), and the upper MOSFET on-resistance (r
10
=
reduces the switching frequency according to the
10
FIGURE 1. R
I
------------------------------------------- -
OCS
+
r
–
DS ON
OCSET
5 10
------------------
4 10
------------------
COMP
R
R
R
GND
OCSET
T
T
EN
RT
SS
FB
OCSET
6
7
SWITCHING FREQUENCY (kHz)
T
OCSET
1
2
3
4
5
6
7
RESISTANCE vs FREQUENCY
T
) from this pin to GND, the nominal
(R
(R
, an internal 200 A current source
2-155
R
T
T
T
) from this pin to the drain of the
PULLUP
TO +12V
to 12V)
to GND)
R
T
100
PULLDOWN
TO V
14
13
12
11
10
9
8
VCC
PVCC
LGATE
PGND
BOOT
UGATE
PHASE
SS
T
) from this pin
DS(ON)
1000
) set
HIP6012
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 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.
80
70
60
50
40
30
20
10
FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY
0
100
200
300
SWITCHING FREQUENCY (kHz)
C
400
GATE
500
= 3300pF
C
600
GATE
C
GATE
700
= 1000pF
= 10pF
800
900
1000