HIP6004E Intersil Corporation, HIP6004E Datasheet - Page 6

• Manufacturer Part Number: HIP6004E
• Description: Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor
• Manufacturer: Intersil Corporation

sink develops a voltage across R
V
referenced to V
overcurrent function initiates a soft-start sequence. The soft-
start function discharges C
inhibits PWM operation. The soft-start function recharges
C
clamped to the SS voltage. Should an overload occur while
recharging C
while fully charging C
shows this operation with an overload condition. Note that the
inductor current increases to over 15A during the C
charging interval and causes an overcurrent trip. The
converter dissipates very little power with this method. The
measured input power for the conditions of Figure 4 is 2.5W.
The overcurrent function will trip at a peak inductor current
(I
where I
typical). The OC trip point varies mainly due to the
MOSFET’s r
in the normal operating load range, find the R
from the equation above with:
NOTE: 0 = connected to GND or V
VID pins to HIGH.
I
PEAK
1. The maximum r
2. The minimum I
3. Determine I
PEAK)
VID25
IN
SS
mV
. When the voltage across the upper MOSFET (also
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
where I is the output inductor ripple current.
, and PWM operation resumes with the error amplifier
=
OCSET
determined by:
I
---------------------------------------------------- -
OCSET
VID3
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
DS(ON)
SS
r
is the internal OCSET current source (200 A
IN
DS ON
, the soft-start function inhibits PWM operation
PEAK
PIN NAME
) exceeds the voltage across R
x R
DS(ON)
OCSET
VID2
variations. To avoid overcurrent tripping
OCSET
SS
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
for
to 4V to complete its cycle. Figure 4
SS
at the highest junction temperature.
from the specification table.
I
PEAK
VID1
with a 10 A current sink and
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
6
SS
OCSET
, 1 = connected to V
I
OUT MAX
VID0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
that is referenced to
VOLTAGE DACOUT
OCSET
NOMINAL OUTPUT
+
TABLE 1. OUTPUT VOLTAGE PROGRAM
OCSET
I
SS
DD
1.050
1.075
1.100
1.125
1.150
1.175
1.200
1.225
1.250
1.275
1.300
1.325
1.350
1.375
1.400
1.425
2
resistor
through pull-up resistors or leave the pins floating. Internal pull-ups will force the floating
,
, the
HIP6004E
VID25
mV
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
For an equation for the ripple current see the section under
component guidelines titled “Output Inductor Selection”.
A small, ceramic capacitor should be placed in parallel with
R
presence of switching noise on the input voltage.
Output Voltage Program
The output voltage of a HIP6004E converter is programmed
to discreet levels between 1.05V
voltage identification (VID) pins program an internal voltage
reference (DACOUT) with a TTL-compatible 5-bit digital-to-
analog converter (DAC). The level of DACOUT also sets the
PGOOD and OVP thresholds. Table 1 specifies the DACOUT
voltage for the 32 different combinations of connections on the
VID pins. The output voltage should not be adjusted while the
converter is delivering power. Remove input power before
changing the output voltage. Adjusting the output voltage
during operation could toggle the PGOOD signal and exercise
the overvoltage protection.
Application Guidelines
Layout Considerations
As in any high frequency switching converter, layout is very
important. Switching current from one power device to another
can generate voltage transients across the impedances of the
interconnecting bond wires and circuit traces. These
interconnecting impedances should be minimized by using
wide, short-printed circuit traces. The critical components
should be located as close together as possible, using ground
plane construction or single point grounding.
OCSET
VID3
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
to smooth the voltage across R
PIN NAME
VID2
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
VID1
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
VID0
DC
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
and 1.825V
VOLTAGE DACOUT
OCSET
NOMINAL OUTPUT
DC
1.450
1.475
1.500
1.525
1.550
1.575
1.600
1.625
1.650
1.675
1.700
1.725
1.750
1.775
1.800
1.825
in the
. The