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Data Sheet 6SD106E
Page 10
Internet: w ww. CT- C O N C EPT . c o m
drivers do not use a static reference
voltage to compare the voltage at the
collector. Instead, the reference is
used as shown in Fig. 5.
Notes on Table 1
The values for “Vth1” and “Vth2” are
listed in Table 1 as a function of the
reference resistance Rth.
The value in the “Vth1” column cor-
responds to the voltage threshold after
the response time has elapsed.
The value in the “Vth2” column cor-
responds to the voltage which is set up
statically across the resistor Rth. This
static value is typically reached after
between 10 and 15 µs.
The value in the “V
CE(off)”
column
corresponds to the collector-emitter
voltage value at which the protection
function is activated when the external
circuit is used as shown in Fig. 4 with
one or two Dm diodes of type
1N4007 connected in series.
Value Rth
Reaction time Vth1
Vth2
V
CE(off)
22k
£ 4.9ms
£ 4.8V
£ 3.2V
2.35V (1 Diode)
27k
£ 5.7ms
£ 5.6V
£ 3.9V
3.05V (1 Diode)
33k
£ 6.8ms
£ 6.5V
£ 4.7V
3.25V (2 Diodes)
39k
£ 7.6ms
£ 7.3V
£ 5.6V
4.15V (2 Diodes)
47k
£ 9ms
£ 8.4V
£ 6.8V
5.35V (2 Diodes)
Table 1 Reference resistor, reaction time and turn-off threshold
+Vdc
0V
Vth
Response time
Detail view
Detail
0V
Vce
Vth1
Vce
Vth2
Fig. 5 Collector-sense voltage curve