ISL6144 Intersil Corporation, ISL6144 Datasheet - Page 10

• Manufacturer Part Number: ISL6144
• Description: High Voltage ORing MOSFET Controller
• Manufacturer: Intersil Corporation

V
The duration of the reverse current pulse is a few hundred
nanoseconds and is normally kept well below current rating
of the ORing MOSFET.
Reducing the value of V
current amplitude and reduces transients on the common
bus output voltage.
HVREF and COMP Capacitor Values
HVREF CAPACITOR (C1)
this capacitor is necessary to stabilize the HV
and a value of 150nF is sufficient. Increasing this value will
result in gate turn-on time increase.
Typical Performance Curves and Waveforms
OS(HS)
FIGURE 5. CHARGE PUMP VOLTAGE (V
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
12
11
10
FIGURE 7. I BIAS CURRENT vs TEMPERATURE
9
8
7
is the voltage offset of HS Comparator.
-40
-40
TEMPERATURE
-20
-20
0
0
TH(HS)
TEMPERATURE (°C)
TEMPERATURE (°C)
20
20
10
results in lower reverse
40
40
60
60
GQP
80
80
REF(VZ)
) vs
75V
10V
12V
100
100
12V
75V
12V
10V
48V
48V
supply
120
120
ISL6144
COMP CAPACITOR (C2)
Placed between V
and decoupling. A 10nF capacitor is adequate for most
cases.
Protecting VIN and VOUT from High dv/dt Events
In hot swap applications where the ISL6144 is directly
connected to a prebiased bus (thus exposing either the VIN
or VOUT pins directly to high dv/dt transients), these pins
must be filtered to prevent catastrophic damage caused by
the high dv/dt transients. A simple RC filter using a series
resistor, < 100Ω and the standard > 100nF decoupling
capacitor to ground. This will give >1µs rise time on the VIN
pin to protect it. A resistor of the same value may be added
to the other (VOUT) pin to eliminate the small HS Vth error
introduced by that series R, ~0.45V at 48V with 100Ω
resistor. Alternately the programmed HS Vth can be adjusted
upward by that much as previously described.
.
5.4
5.3
5.2
5.1
5.0
32
28
24
20
16
12
FIGURE 6. REG. AMP FORWARD REGULATION
-40
-40
-20
-20
FIGURE 8. VSET VOLTAGE
OUT
0
0
and COMP pins to provide filtering
TEMPERATURE (°C)
TEMPERATURE (°C)
20
20
40
40
60
60
10V AND 12V
80
10V AND 12V
80
February 15, 2007
100
100
48V
75V
75V
48V
FN9131.3
120
120