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Table 2: BP6A Reference Design Component Selection
Designation
R1, R2, R3, R4, R5, R6
R8, R9, R10, R11, R12, R13
R7
R14
C1, C2, C3, C4, C5, C6
C9,C10,C11,C12,C13,C14
C7,C8
D1, D2, D3, D4,D5,D6
D7
IC1, IC2, IC3, IC4, IC5, IC6
IC7, IC8, IC9, IC10, IC11,IC12
CN1
CN3,CN4,CN5
CN2
IC13,IC14,IC15, IC16,IC17,IC18
Characteristic
15K ? , 0.25W
180 ? , 0.25W
4.7K ? , 0.25W
1.8K ? , 0.25W
0.1 μ F, 50V Multi-Layer Ceramic
39 μ F, 35V, 105C, Low imp.
560 μ F, 50V, 105C, Low imp.
Super bright red LED
Super bright green LED
Fast Opto coupler HCPL 4504
Slow Opto coupler NEC PS2501
10 pos. 0.1” right angle single row header
Single row bottom entry header receptacle
2 pos. 0.1” right angle single row header
Isolated DC/DC converter
Description
Control input pull-up
Input current limiter (15mA@V L =5V)
Fault signal pull-up
Power Indicator Current limiter
High speed opto decoupling capacitor
Control power decoupling capacitor
DC to DC input decoupling capacitor
Fault indicator LED
Control power LED
Control signal isolator
Fault signal isolator
Control signal connector
IPM connector Hirose MDF7-11S-2.54DSA(22)
24VDC Control power connector
Powerex P/N VLA106-24151
optocoupler’s LED to the IPM’s fault pin. The
optocoupler’s transistor turns on and its collector pulls the
fault feedback line low to indicate a fault. If any of the
IPM’s six fault output signals become active its fault
isolation opto will pull the fault feedback line low. Slow
optos are used because they offer the advantages of
lower cost and higher current transfer ratios. High speed
is not necessary because the IPM disables a faulted
device and produces a fault signal for a minimum of 1ms.
The BP6A also includes an LED in series with each fault
output (D1-D6) to provide a quick visual indication when
the IPM’s fault signal is active. This was included for
trouble shooting purposes only so it can be replaced by a
jumper without affecting the operation of the interface
circuit.
Isolated control power for the IPM is supplied by
Powerex isolated DC to DC converters (IC13-IC18) as
described above. Each power supply is decoupled at the
IPM’s pins with a low impedance electrolytic capacitor
(C9-C14). These capacitors must be low impedance/high
ripple current types because they are required to supply
the high current gate drive pulses to the IPM’s internal
gate driving circuits. The DC to DC converters are
powered from a single 24VDC supply connected at CN2.
The 24VDC supply is decoupled by the electrolytic
capacitors C7 and C8 to maintain a stable well filtered
source for the DC to DC converters. The current draw on
the 24V supply will range from about 80mA to 380mA
depending on the module being driven and switching
Figure 4: BP6A External Connections
V WN1
W N
WNF O
V WNC
V WP1
W P
WPF O
V WPC
CN5
V VN1
V N
VNF O
V VNC
V VP1
V P
VPF O
V VPC
CN4
V UN1
U N
UNF O
V UNC
frequency. For a more accurate estimate it is necessary
to use the IPM’s circuit current (I D ) versus f C characteristic
to obtain the current required by the IPM being used. The
IPM current draw can then be adjusted using the DC to
DC converter efficiency specification to arrive at the
CN1
V UP1
U P
UPF O
V UPC
CN3
CN2
current draw on the 24V supply. Refer to the general IPM
application notes for detailed information. A power
indicator consisting of an LED (D7) in series with current
limiting resistor (R14) is provided to show that the 24VDC
supply is present.
+5
VDC
CMOS type
buffer must
sink 15mA
To Logic Level Control Circuits
RC Filter to
remove noise
on fault signal
RC~10us
+ -
24
VDC
4
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