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HIP6004E Datasheet(PDF) 6 Page - Intersil Corporation

Part No. HIP6004E
Description  Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor
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Maker  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
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HIP6004E Datasheet(HTML) 6 Page - Intersil Corporation

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6
The overcurrent function cycles the soft-start function in a
hiccup mode to provide fault protection. A resistor (ROCSET)
programs the overcurrent trip level. An internal 200
µA current
sink develops a voltage across ROCSET that is referenced to
VIN. When the voltage across the upper MOSFET (also
referenced to VIN) exceeds the voltage across ROCSET, the
overcurrent function initiates a soft-start sequence. The soft-
start function discharges CSS with a 10µA current sink and
inhibits PWM operation. The soft-start function recharges
CSS, and PWM operation resumes with the error amplifier
clamped to the SS voltage. Should an overload occur while
recharging CSS, the soft-start function inhibits PWM operation
while fully charging CSS to 4V to complete its cycle. Figure 4
shows this operation with an overload condition. Note that the
inductor current increases to over 15A during the CSS
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
(IPEAK) determined by:
where IOCSET is the internal OCSET current source (200µA
typical). The OC trip point varies mainly due to the
MOSFET’s rDS(ON) variations. To avoid overcurrent tripping
in the normal operating load range, find the ROCSET resistor
from the equation above with:
1. The maximum rDS(ON) at the highest junction temperature.
2. The minimum IOCSET from the specification table.
3. Determine IPEAK for
,
where
∆I is the output inductor ripple current.
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
ROCSET to smooth the voltage across ROCSET in the
presence of switching noise on the input voltage.
Output Voltage Program
The output voltage of a HIP6004E converter is programmed to
discreet levels between 1.05VDC and 1.825VDC. The 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.
0A
0V
TIME (20ms/DIV.)
5A
10A
15A
2V
4V
FIGURE 4. OVER-CURRENT OPERATION
I
PEAK
I
OCSET x ROCSET
r
DS ON
()
-----------------------------------------------------
=
I
PEAK
I
OUT MAX
()
∆I
() 2
+
>
TABLE 1. OUTPUT VOLTAGE PROGRAM
PIN NAME
NOMINAL OUTPUT
VOLTAGE DACOUT
PIN NAME
NOMINAL OUTPUT
VOLTAGE DACOUT
VID25
mV
VID3
VID2
VID1
VID0
VID25
mV
VID3
VID2
VID1
VID0
00
100
1.050
0
110
0
1.450
10
100
1.075
1
110
0
1.475
00
011
1.100
0
101
1
1.500
10
011
1.125
1
101
1
1.525
00
010
1.150
0
101
0
1.550
10
010
1.175
1
101
0
1.575
00
001
1.200
0
100
1
1.600
10
001
1.225
1
100
1
1.625
00
000
1.250
0
100
0
1.650
10
000
1.275
1
100
0
1.675
HIP6004E


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