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UM1557 Datasheet(PDF) 49 Page - STMicroelectronics

Part # UM1557
Description  The aim of this document is to give the design engineer
PDF  111 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1557 Datasheet(HTML) 49 Page - STMicroelectronics

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UM1557
Switching inductive loads
Doc ID 023521 Rev 2
49/111
External clamping circuitry examples
Table 7.
External clamping circuitry examples(1/2)
External clamping circuitry
+
–
1) Freewheeling diode and reverse battery diode)
Low cost
Load is reverse battery
protected
Only for small loads
(voltage drop and power
dissipation on reverse
battery protection diode Dr)
Slow demagnetization
2) Transil and diode (in parallel with the load)
Fast demagnetization
Load is reverse battery
protected
Only for small loads
(voltage drop and power
dissipation on reverse
battery protection diode Dr )
3) Freewheeling diode and reverse battery FET
Load is reverse battery
protected
Low peak power
dissipation on D during
demag. phase
Suitable for high current
inductive loads such as
DC motors
High number of ext.
components (cost)
Slow demagnetization
L
R
Vbat
GND
OUT
Rgnd
Dgnd
GND
GND
Clamp
Vout
Iout
GND
D
Dr
L
R
GND
OUT
Rgnd
Dgnd
GND
GND
Clamp
Vout
Iout
T
D
GND
Dr
L
R
Vbat
GND
OUT
Rgnd
Dgnd
GND
GND
Clamp
Iout
GND
D
PMOS
4k7
15V
GND



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