HIP6012EVAL1 Intersil, HIP6012EVAL1 Datasheet - Page 4

• Manufacturer Part Number: HIP6012EVAL1
• Description: EVAL BOARD DISK DRIVE SUPPLY
• Manufacturer: Intersil

Specifications of HIP6012EVAL1

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.3 ~ 12V
• Current - Output: 25A
• Voltage - Input: 2.5 ~ 12 V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: HIP6012
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Frequency - Switching: -

Typical Performance Curves
Functional Pin Descriptions
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
V
following equation.:
OCSET (Pin 2)
Connect a resistor (R
upper MOSFET. R
(I
the converter overcurrent (OC) trip point according to the
following equation:
I
Fs 200kHz
Fs
PEAK
OCS
CC
≈
≈
1000
200kHz
reduces the switching frequency according to the
100
), and the upper MOSFET on-resistance (r
10
=
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 200µA current source
R
T
T
T
) from this pin to the drain of the
PULLUP
TO +12V
to 12V)
to GND)
R
4
T
100
PULLDOWN
TO V
14
13
12
11
10
9
8
VCC
LGATE
PGND
BOOT
UGATE
PHASE
PVCC
SS
T
) from this pin to
DS(ON)
1000
) set
HIP6012
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 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 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.
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
December 27, 2004
900
FN4324.2
1000