< Dual-In-Line Package Intelligent Power Module >
Series Application note
Publication Date: September 2016
37
Influence of pattern wiring around the shunt resistor is shown below.
Fig.3-1-12 External protection circuit
(1) Influence of the part-A wiring
The ground of N-side IGBT gate is V
NC
. If part-A wiring pattern in Fig.3-1-12 is too long, extra voltage
generated by the wiring parasitic inductance will result the potential of IGBT emitter variation during switching
operation. It is necessary to locate shunt resistor as close to the N terminal as possible.
(2) Influence of the part-B wiring
The part-B wiring in Fig.3-1-12 affects SC protection level. SC protection works by detecting the voltage of the
CIN terminals. If part-B wiring is too long, extra surge voltage generated by the wiring inductance will lead to
deterioration of SC protection level. It is necessary to connect CIN and V
NC
terminals directly to the two ends of
shunt resistor and avoid long wiring.
(3) Influence of the part-C wiring pattern
C1R2 filter is added to remove noise influence occurring on shunt resistor. Filter effect will dropdown and noise
will easily superimpose on the wiring if part-C wiring in Fig.3-1-12 is too long. It is necessary to install the C1R2
filter near CIN, V
NC
terminals as close as possible.
(4) Influence of the part-D wiring pattern
Part-D wiring pattern in Fig.3-1-12 gives influence to all the items described above, maximally shorten the
GND wiring is expected.
Drive circuit
Drive circuit
SC protection
W
V
U
C
V
NC
CIN
A
P
N1
N
D
R2
Shunt resistor
DIPIPM
P-side
IGBTs
N-side
IGBTs
Current path
External protection circuit
B
C1