FMXB-2102 Datasheet, PDF (5/8 Pages) Sanken electric – Fast Recovery Diode with built-in SBD for temperature detection

Fast Recovery Diode with built-in SBD for temperature detection
FMXB-2102
December, 2005
§3. Thermal protection
Sample calculation for the operating temperature range.
SE series
IR－Tj　Characteristics of SBD at 15V
5
max
typ.
4
min
3
2
1
0
120
125
130
135
140
Junction Temperature（℃）
When the voltage is generated across the REX by the IR of the SBD and this voltage is raised up to the Vref of the
shunt regulator by the rapid increase in the IR at high temperature, the latch circuit is started to operate and the power
supply unit stops its operation.
Say Vref=2.5V, REX=1200Ω. Then IR=2.5 / 1200 = 2.08mA. Hence, the figure above gives the thermal protection
operating temperature range: 124°C to 134.2°C.
Sanken Electric Co.,Ltd.
5/8
D01-005EA-051215