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IR3086 Datasheet, PDF (13/15 Pages) International Rectifier – PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT
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IR3086
The IR3086 has the ability to detect if a phase stops switching and can provide this information to the system through
the PHSFLT output pin. If a phase stops switching its output current will drop to zero and the output of its IR3086
current sense amp will be the DACIN voltage. The Share Adjust Amplifier reacts to this by increasing the Ramp Slope
Adjust current until it exceeds the externally programmable PWM Ramp bias current. This will cause the voltage at the
PWMRMP pin to drop below its normal operating range. The Fault Comparator trips and drives the PHSFLT output to
ground when the voltage on the PWMRMP pin falls below 91% of the DACIN voltage. PHSFLT is an open-collector
output and should be pulled up to a voltage source through a resistor.
APPLICATIONS INFORMATION
12V
10
0.1uF
ENABLE
VID5
VID0
VID1
VID2
VID3
VID4
0.1uF
1
OSCDS
2 VID5
3 VID0
4 VID1
5
VID2
6 VID3
7
VID4
IR3081
CONTROL
IC
21
VBIAS
BBFB 20
EAOUT 19
FB 18
17
VD R P
IIN 16
15
OC SET
R OC SET
RVFB
RVFB
RVDRP
RVDRP
ROSC
RVDAC
RSHARE
C VD AC
RCS-
RBIASIN
CCS-
C C S+
R C S+
0.1uF
1 RMPIN+
2 RMPIN-
3
H OTSET
4
VR H OT
5 ISHARE
IR3086
PHASE
IC
VCCH 15
GATEH 14
13
PGN D
12
GATEL
VCCL 11
CSCOMP
0. 1uF
10
RPWMRMP
0.1uF
RCS-
RBIASIN
CCS-
C C S+
R C S+
0.1uF
1
R MPI N +
2
R MPI N -
3 HOTSET
4 VRHOT
5 ISHARE
IR3086
PHASE
IC
15
VC C H
14
GATEH
PGND 13
GATEL 12
VCCL 11
CSCOMP
0. 1uF
10
RPWMRMP
0.1uF
RCS-
RBIASIN
CCS-
C C S+
R C S+
0.1uF
1 RMPIN+
2 RMPIN-
3
H OTSET
4 VRHOT
5 ISHARE
IR3086
PHASE
IC
VCCH 15
GATEH 14
13
PGN D
GATEL 12
VCCL 11
CSCOMP
0. 1uF
10
RPWMRMP
0.1uF
RCS-
RBIASIN
CCS-
C C S+
R C S+
0.1uF
1
R MPI N +
2 RMPIN-
3 HOTSET
4 VRHOT
5
I SH AR E
IR3086
PHASE
IC
15
VC C H
GATEH 14
PGND 13
GATEL 12
11
VC C L
CSCOMP
0. 1uF
10
RPWMRMP
0.1uF
RCS-
RBIASIN
CCS-
C C S+
R C S+
0.1uF
1 RMPIN+
2 RMPIN-
3
H OTSET
4
VR H OT
5 ISHARE
IR3086
PHASE
IC
VCCH 15
GATEH 14
13
PGN D
12
GATEL
VCCL 11
CSCOMP
0. 1uF
10
RPWMRMP
0.1uF
POWERGOOD
VRHOT
PHASE FAULT
CIN
DISTRIBUTION
IMPEDANCE
VOUT SENSE+
VOUT+
COUT
VOUT-
VOUT SENSE-
Figure 7 – 5 Phase IR3081/3086 EVRD10 Converter
Page 13 of 15
9/1/03
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