HIP6017BCB Intersil Corporation, HIP6017BCB Datasheet - Page 9

• Manufacturer Part Number: HIP6017BCB
• Description: Advanced PWM and Dual Linear Power Control
• Manufacturer: Intersil Corporation

range, determine the R
above with:
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 1.3V
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, because they are internally pulled
up to +5V by a 10 A (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. The
‘11111’ VID pin combination resulting in an INHIBIT disables the
IC and the open-collector at the PGOOD pin.
Application Guidelines
Soft-Start Interval
Initially, the soft-start function clamps the error amplifier’s
output of the PWM converter. After the output voltage
increases to approximately 80% of the set value, the
reference input of the error amplifier is clamped to a voltage
proportional to the SS pin voltage. Both linear outputs follow
a similar start-up sequence. The resulting output voltage
sequence is shown in Figure 6.
The soft-start function controls the output voltage rate of rise
to limit the current surge at start-up. The soft-start interval is
1. The maximum r
2. The minimum I
3. Determine I
CURRENT1
OVER-CURRENT TRIP: V
(i
OC1
HIP6017B
D
OVER-
where I is the output inductor ripple current.
x r
PWM
DS
(ON) > I
+
-
FIGURE 9. OVER-CURRENT DETECTION
CONTROL
GATE
OCSET
PEAK
OCSET
DS(ON)
DRIVE
x R
I
for I
OCSET
200 A
DS
OCSET
OCSET
PEAK
> V
from the specification table.
at the highest junction temperature.
DC
SET
)
VCC
VCC
and 3.5V
9
resistor from the equation
> I
OCSET
UGATE
PHASE
LGATE
PGND
OUT(MAX)
DC
. This output is
V
V
R
V
OCSET
PHASE
OCSET
SET
+ ( I)/2,
+
= V
= V
V
IN
IN
IN
i
D
+
- V
- V
V
= +5V
DS
SET
DS
HIP6017B
NOTE: 0 = connected to GND or V
through pull-up resistors.
programmed by the soft-start capacitor, C
a faster soft-start interval increases the peak surge current.
The peak surge current occurs during the initial output
voltage rise to 80% of the set value.
Shutdown
The PWM output does not switch until the soft-start voltage
(V
reference on each linear’s amplifier is clamped to the soft-
start voltage. Holding the SS pin low with an open drain or
collector signal turns off all three regulators.
The ‘11111’ VID code resulting in an INHIBIT as shown in
Table 1 also shuts down the IC.
SS
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
) exceeds the oscillator’s valley voltage. Additionally, the
TABLE 1. V
VID3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
PIN NAME
VID2
OUT1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
VOLTAGE PROGRAM
SS
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
, 1 = open or connected to 5V
VID0
SS
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
. Programming
VOLTAGE
NOMINAL
DACOUT
INHIBIT
OUT1
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.05
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5