ISL6144 Datasheet, PDF (12/29 Pages) Intersil Corporation – High Voltage ORing MOSFET Controller

Typical Performance Curves and Waveforms (Continued)
I_IN2
V_OUT
V_IN2
2A/DIV
10V/DIV
10V/DIV
V_GS2
V_GS2
5V/DIV
I_IN2
V_OUT
2V/DIV
V_IN2
5V/DIV
2A/DIV
FIGURE 12. SLOW SPEED TURN-OFF, V_IN = 48V, COMMON
LOAD IS SMPS (C_LOAD = 100µF) WITH
EQUIVALENT 4A LOAD
FIGURE 13. SLOW SPEED TURN-OFF, V_IN = 12V, COMMON
LOAD IS SMPS (C_LOAD = 100µF) WITH
EQUIVALENT 4A LOAD
Application Circuit
INPUT BUS 1
36V TO 75VDC
C_IN1
100µF _Cd1
220nF
(NOTE 13)
DC/DC
#1
+IN +OUT
C_cs1 ^PC
1nF
+S
SC
PR
-S
-IN -OUT
+OUT1 = 48V
R_pb1 Sa
10
Sb
FROM
CB
F1 (NOTE 12)
15A
C_pb1
22µF _C1
150nF
D₁ (NOTE 10)
Q₁
FDB3632
VIN ^GATE VOUT
5V
R₃
4.99k
HVREF U1 ^COMP
ISL6144
FAULT
VSET
GND
R₁
499
R₂
47.5k
C₂
10nF
COMMON BUS “CB”
10A
INPUT BUS 2
36V TO 75VDC
C_IN2
100µF
C_d2
220nF
(NOTE 13)
DC/DC
#2
+IN +OUT
C_cs2
1nF
PC ^+S
SC
PR
-S
-IN -OUT
+OUT2 = 48V
R_pb2 Sa
10
Sb
FROM
CB
F2 (NOTE 12)
15A
C_pb2
22µF _C3
150nF
D₂ (NOTE 10)
Q₂
FDB3632
VIN ^GATE VOUT
5V _R4
4.99k
HVREF ^{U1 COMP}
ISL6144
FAULT
VSET
GND
R₅
499
R₆
47.5k
C₄
10nF
PRIMARY
SECONDARY
NOTES:
10. D₁, D₂ are parasitic MOSFET diodes.
11. Remote Sense pin (+S) on both DC/DC converters has to be connected either directly at the module output (Sa closed) or to the CB point (Sb
closed). Connecting to CB is not recommended as it might cause Fault propagation in case of short circuit on a PS output.
12. F1, F2 are optional and can be eliminated depending on power system configuration and requirements.
13. DC/DC #1, 2 configuration is based on Vicor V48B48C250AN3.
FIGURE 14. APPLICATION CIRCUIT FOR A 1 + 1 REDUNDANT 48V SYSTEM
12
FN9131.5
October 8, 2010