hip6019cb Intersil Corporation, hip6019cb Datasheet - Page 9

• Manufacturer Part Number: hip6019cb
• Description: Advanced Dual Pwm And Dual Linear Power Control
• Manufacturer: Intersil Corporation

Resistors (R
current trip levels for each PWM converter. As shown in
Figure 9, the internal 200 A current sink develops a voltage
across R
signal enables the over-current comparator (OVER-
CURRENT1 or OVER-CURRENT2). When the voltage
across the upper MOSFET (V
current comparator trips to set the over-current latch. Both
V
across R
to MOSFET switching. The over-current function will trip at a
peak inductor current (I
The OC trip point varies with MOSFET’s temperature. To avoid
over-current tripping in the normal operating load range,
determine the R
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 PWM1 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 current source. Changing
the VID inputs during operation is not recommended. The
I
PEAK
1. The maximum r
2. The minimum I
3. Determine I
CURRENT2
OC2
SET
OVER-CURRENT TRIP: V
OVER-
(I
where I is the output inductor ripple current.
D
PWM
and V
• r
=
DS(ON)
OCSET
I
--------------------------------------------------- -
OCSET
OCSET
+
-
FIGURE 9. OVER-CURRENT DETECTION
DS
CONTROL
OCSET1
r
GATE
DS ON
> I
are referenced to V
OCSET
PEAK
(V
helps V
OCSET
R
SET
OCSET
DS(ON)
OCSET
DRIVE
and R
I
OCSET
for I
200 A
) that is referenced to V
• R
resistor from the equation above with:
OCSET
PEAK)
DS
OCSET
PEAK
2-260
from the specification table.
> V
at the highest junction temperature.
OCSET2
DC
SET
VCC
DS
determined by:
)
track the variations of V
HIP6019
and 3.5V
> I
OCSET
UGATE
PHASE
) exceeds V
OUT(MAX)
IN
) program the over-
and a small capacitor
DC
V
V
R
. This output is
V
OCSET
PHASE
OCSET
SET
SET
+ ( I)/2,
IN
. The DRIVE
+
, the over-
= V
= V
V
IN
IN
IN
I
V
D
- V
+
- V
IN
DS
= +5V
SET
DS
due
HIP6019
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.
Application Guidelines
Soft-Start Interval
Initially, the soft-start function clamps the error amplifiers’
output of the PWM converters. 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. 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.
Shutdown
Neither PWM output switches 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 four regulators.
The VID codes resulting in an INHIBIT as shown in Table 1
also shut down the IC.
SS
VID4
0
0
0
0
0
0
0
0
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
PIN NAME
VID2
OUT1
X
1
1
1
0
0
0
0
1
1
1
1
0
0
0
VOLTAGE PROGRAM
VID1
X
1
0
0
1
1
0
0
1
1
0
0
1
1
0
VID0
SS
X
X
1
0
1
0
1
0
1
0
1
0
1
0
1
. Programming
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