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PDF FMXB-2102 Data sheet ( Hoja de datos )
| Número de pieza | FMXB-2102 | |
| Descripción | Fast Recovery Diode | |
| Fabricantes | Sanken | |
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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
1 page  
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
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet FMXB-2102.PDF ] | |
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