HIP6028 Ver la hoja de datos (PDF) - Intersil
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HIP6028 Datasheet PDF : 16 Pages
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HIP6028
of VIN due to MOSFET switching. The over-current function
will trip at a peak inductor current (IPEAK) determined by:
IPEAK = -I-O-----C----S----Er--D--T---S--×--(--OR----N-O---)--C----S----E----T-
OVER-CURRENT TRIP: VDS > VSET
(iD • rDS(ON) > IOCSET • ROCSET)
OCSET
IOCSET
200µA
VCC
DRIVE
OC1
+
-
OVER-
CURRENT1
PWM
HIP6028
GATE
CONTROL
UGATE
PHASE
VCC
LGATE
PGND
VIN = +5V
ROCSET
VSET +
ID
+
VDS
VPHASE = VIN - VDS
VOCSET = VIN - VSET
FIGURE 9. OVER-CURRENT DETECTION
The OC trip point varies with MOSFET’s temperature. To avoid
over-current tripping in the normal operating load range,
determine 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 IPEAK > IOUT(MAX) + (∆I)/2,
where ∆I is the output inductor ripple current.
For an equation for the output inductor ripple current see the
section under component guidelines titled ‘Output Inductor
Selection’.
OUT1 Voltage Program
The output voltage of the PWM converter is programmed to
discrete levels between 1.3VDC and 3.5VDC. This output is
designed to supply the microprocessor core voltage. The
voltage identification (VID) pins program an internal voltage
reference (DACOUT) through a TTL-compatible 5-bit digital-
to-analog converter. The level of DACOUT also sets the
PGOOD and OVP thresholds. Table 1 specifies the
DACOUT voltage for the different combinations of
connections on the VID pins. The VID pins can be left open
for a logic 1 input, since they are internally pulled up to +5V
by a 10µA (typically) current source. Changing the VID
inputs during operation is not recommended. The sudden
change in the resulting reference voltage could toggle the
PGOOD signal and exercise the over-voltage protection or
cause an over-current event. ‘11111’ VID pin combination
disables the IC and drives ‘on’ the otherwise open-collector
at the PGOOD pin.
TABLE 1. VOUT1 VOLTAGE PROGRAM
VID4
PIN NAME
VID3
VID2
VID1
VID0
NOMINAL
OUT1
VOLTAGE
DACOUT
0
1
1
1
1
1.30
0
1
1
1
0
1.35
0
1
1
0
1
1.40
0
1
1
0
0
1.45
0
1
0
1
1
1.50
0
1
0
1
0
1.55
0
1
0
0
1
1.60
0
1
0
0
0
1.65
0
0
1
1
1
1.70
0
0
1
1
0
1.75
0
0
1
0
1
1.80
0
0
1
0
0
1.85
0
0
0
1
1
1.90
0
0
0
1
0
1.95
0
0
0
0
1
2.00
0
0
0
0
0
2.05
1
1
1
1
1
INHIBIT
1
1
1
1
0
2.1
1
1
1
0
1
2.2
1
1
1
0
0
2.3
1
1
0
1
1
2.4
1
1
0
1
0
2.5
1
1
0
0
1
2.6
1
1
0
0
0
2.7
1
0
1
1
1
2.8
1
0
1
1
0
2.9
1
0
1
0
1
3.0
1
0
1
0
0
3.1
1
0
0
1
1
3.2
1
0
0
1
0
3.3
1
0
0
0
1
3.4
1
0
0
0
0
3.5
NOTE: 0 = connected to GND or VSS, 1 = open or connected to 5V
through pull-up resistors
2-319
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