Power integrations Scale-2 1SC0450E2B0, Руководство по применению, Страница: 12 / 25

SCALE™-2 1SC0450E2B0
Preliminary Description & Application Manual
www.power.com/igbt-driver Page 12
power and temperature rating of the resistors used must not be exceeded. Dimensioning
recommendations are given below.
I
Vce
≅
V
DC-link ( max )
R
tot
=0.6
..
.0.8mA
Eq. 5
 All resistors R
vcei
(i ≥ 1) must have the same value.
 R
div
allows the static threshold detection level V
CEth
to be increased if required (resistive voltage
divider with R
tot
). R
div
can be calculated with Eq. 6 in order to determine the static detection level
V
CEth
.
R
div
[kΩ]=R
tot
[kΩ]∙
V
th
[ V ] + | V
GL
[V] |
V
CEth
[ V ] -V
th
[V]
(V
CEth
> V
th
) Eq. 6
|V
GL
| is the absolute value of the gate-emitter turn-off voltage at the driver output. It depends on
the driver load and can be found in the driver data sheet /3/. V
th
is the reference value set at the
reference terminal REF as described in the “Reference terminal (REF)” section.
 The recommended range for the overall capacitance value C
tot
is given in Eq. 7:
C
tot
=
1
∑
1
C
vcek
p
k=1
=1…4pF
Eq. 7
 All capacitances C
vcek
with k≥2 must have the same value.
 The capacitance C
vce1
must be chosen such that the Eq. 8 is satisfied:
C
vce1
C
tot
= ( 0.7…0.9 ) ∙
R
tot
R
vce1
+R
vce2
Eq. 8
 The maximum voltage rating of the resistors and capacitors used must not be exceeded. Peak
values and average values must be considered. Dimensioning recommendations are given below.
 The diodes D
9
and D
10
must have a very low leakage current and a blocking voltage of >40V (e.g.
BAS416). Schottky diodes must be explicitly avoided.
 R
a
and C
a
are used to set the response time.
Recommended values for 6500V IGBTs with DC-link voltages up to 4500V
 R
vce1
=R
vce2
=…=R
vce30
=200kΩ (500mW, 400V
peak
, 1%)
 R
div
=620kΩ (0603, 1%)
 C
vce1
=15pF (C0G, 1000V, 5%)
 C
vce2
=C
vce3
=…=C
vce15
=22pF (C0G, 630V, 5%)
 C
a
=22pF (C0G, 50V, 5%)
 R
th
=not assembled
 R
a
=refer to Table 1 below (0603, 1%)
This setup uses 30 resistors R
vcei
and 15 capacitors C
vcek
and leads to a static desaturation detection
threshold of about 201V.