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AN319 Datasheet(PDF) 3 Page - STMicroelectronics

Part # AN319
Description  RELAY DRIVE PROTECTION
PDF  7 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN319 Datasheet(HTML) 3 Page - STMicroelectronics

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AN319 APPLICATION NOTE
Figure 3. Relay Drive Protection
Note: (d) Unidirectional Transil.
(e) Bidirectional Transil.
(f) Bidirectional Transil.
VCL is the voltage (measured) at the terminals of the Transil when the load current goes through it.
If we take VCL = VCC, we limit the overvoltage to a reasonable value and thus period t2 represents only
0.4 x t1. A correct choice of VCL will reduce t2 to very low values and reach the mechanical limit given by
the relay.
Figure 4. Current in the inductance at switch off
Note: (g) Recovery diode circuit: current slowly decreases to 0.
(h) Transil circuit: current decreases rapidly (asymptote = –VCL* / R).
d
L
R
A
e
L
R
A
I
f
L
R
A
T
g
h
VCC
R
VCC
2R
VCC
R
VCC
2R
VCL
R
VCC
VCC
L
R
L
R
A
A
D
T
t1 =
Ln 2
L
R
t1
t
t2
t



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