FMXB-2102 Datasheet, PDF (1/8 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
■General Description
An SBD for overheating detection is incorporated together
with a secondary side rectification FRD into a TO220F
package.
By using the temperature change of the leakage current of the
built-in SBD, high-precision heating protection can be
performed without using expensive temperature sensors, such
as a thermistor and a posistor.
■Applications
• For an overcurrent protection, a partial short circuit and an
impedance short protection.
An overcurrent protection is possible for a secondary side
output, especially for each output of a multi-output power
supply.
• For an overcurrent protection of a peak-load power supply
units.
Thermal protection is possible even for the unit kept in a
peak-load state.
■Features
• Built-in SBD for an overheating detection together with a
FRD in a TO220F package.
(By combining together in a single package, FMXB-2102
excels in heat performance.)
• High-precision heating protection without expensive
temperature sensors such as a thermistor and a posistor.
Typical connection
■Package---TO220F-2Pin
■Typical connection
The typical connection below shows that the overheating
protection with a small component count and a minimal
temperature variation is realized and a single diode enables to
combine a latch circuit with a overvoltage protection circuit.
This circuit allows to adjust a latch temperature easily by
adjusting a detection resistor.
Note: In the case of dead short, the overheating protection is not
available because there is no voltage appearing on the
secondary-side. In this case, please protect the unit by the primary
side detection as usual.
FMXB-2102
Voltage appears across the REX due to the IR of SBD in the
FMXB-2102.
When the voltage across the REX is raised up to the Vref of a
shunt regulator by the rapid increase in the IR at high
temperature, the latch circuit is operated.
Sanken Electric Co.,Ltd.
http://www.sanken-ele.co.jp/en/
1/8
D01-005EA-051215