English
Language : 

ISL6144_07 Datasheet, PDF (10/29 Pages) Intersil Corporation – High Voltage ORing MOSFET Controller
◁
ISL6144
VOS(HS) is the voltage offset of HS Comparator.
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 VTH(HS) results in lower reverse
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 HVREF(VZ) supply
and a value of 150nF is sufficient. Increasing this value will
result in gate turn-on time increase.
Typical Performance Curves and Waveforms
12
75V
11
48V
10
12V
9
10V
8
COMP CAPACITOR (C2)
Placed between VOUT and COMP pins to provide filtering
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.
.
32
75V
28
48V
24
10V AND 12V
20
16
7
-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
FIGURE 5. CHARGE PUMP VOLTAGE (VGQP) vs
TEMPERATURE
12
-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
FIGURE 6. REG. AMP FORWARD REGULATION
6.0
5.5
75V
5.0
4.5
48V
4.0
1122VV
3.5
3.0
10V
2.5
2.0
-40 -20
0 20 40 60 80
TEMPERATURE (°C)
100 120
FIGURE 7. I BIAS CURRENT vs TEMPERATURE
5.4
75V
5.3
48V
10V AND 12V
5.2
5.1
5.0
-40
-20 0 20 40 60 80
TEMPERATURE (°C)
FIGURE 8. VSET VOLTAGE
100 120
10
FN9131.3
February 15, 2007
 ▷