HIP6017 Intersil Corporation, HIP6017 Datasheet - Page 9

• Manufacturer Part Number: HIP6017
• Description: Advanced PWM and Dual Linear Power Control
• Manufacturer: Intersil Corporation

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 1.8V
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
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
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.
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. All
VID pin combinations resulting in an INHIBIT disable the IC
and the open-collector at the PGOOD pin.
CURRENT1
OVER-CURRENT TRIP: V
(i
OC1
HIP6017
D
OVER-
x r
PWM
DS
(ON) > I
+
-
FIGURE 9. OVER-CURRENT DETECTION
CONTROL
GATE
OCSET
DRIVE
• R
I
OCSET
200 A
DS
OCSET
2-218
> V
SET
)
DC
VCC
VCC
OCSET
UGATE
PHASE
LGATE
and 3.5V
PGND
SS
DC
V
V
R
V
OCSET
PHASE
OCSET
SET
. Programming
. This output is
+
= V
= V
V
IN
IN
IN
i
D
+
- V
- V
V
= +5V
DS
SET
DS
HIP6017
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 VID codes resulting in an INHIBIT as shown in Table 1
also shuts down the IC.
NOTE: 0 = connected to GND or V
through pull-up resistors, X = don’t care
Layout Considerations
MOSFETs switch very fast and efficiently. The speed with
which the current transitions from one device to another
causes voltage spikes across the interconnecting
impedances and parasitic circuit elements. The voltage
spikes can degrade efficiency, radiate noise into the circuit,
and lead to device over-voltage stress. Careful component
SS
VID4
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
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
X
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
X
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
X
X
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
NOMINAL
VOLTAGE
DACOUT
INHIBIT
INHIBIT
INHIBIT
OUT1
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