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UM1556 Datasheet(PDF) 45 Page - STMicroelectronics

Part # UM1556
Description  VIPower M0-5 and M0-5Enhanced
PDF  87 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1556 Datasheet(HTML) 45 Page - STMicroelectronics

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UM1556
Switching inductive loads
Doc ID 023520 Rev 2
45/87
Step 1) Demagnetization voltage calculation using Equation 11:
Step 2) Demagnetization time calculation using Equation 12:
Step 3) Calculation of energy dissipated in HSD using Equation 14:
Step 4) HSD datasheet analysis:
The maximum demagnetization energy is specified by I/L diagram in the datasheet. This
diagram shows the maximum turn-off current versus inductance for RL = 0
Ω and
VBAT = 13.5 V (see Figure 39). These conditions are different from conditions considered in
our example (RL = 62
Ω, V
BAT = 16 V) and inductance 260 mH is not covered by the
diagram.
– Battery voltage:
VBAT = 16 V
– HSD:
Clamping voltage:
VND5E160AJ
VCLAMP = 46 V (typical for M0-5/M0-5E)
– Relay:
Resistance
:
Inductance (coil not powered):
NVF4-4C-Z60a
R= 62
Ω@-40°C(1)
L= 260mH(2)
1.
The relay datasheet usually specifies a coil resistance at 20
°C. For the worst case evaluation we should
consider the resistance at -40
°C which can be calculated as:
2.
Not every relay datasheet specifies the coil inductance. In this case it can be determined by measurement.
The inductance value is different with armature seated (relay powered) than when unseated (relay not
powered). The inductance measurement should be done with relay powered (armature seated) because
this better represents the application conditions. The inductance of a typical 12 V automotive relay is in the
range of 200-800 mH.
– Load current (before turn-off
event):
I0 =VBAT/R = 258 mA
R
40
–
R
20
1
0.0039
+
40
–
20
–
()
⋅
()
⋅
=
V
DEMAG
V
BAT
V
CLAMP
–
16
46
–
30V
–
==
=
T
DEMAG
L
R
----
V
DEM AG
I
0 R
⋅
+
V
DEMAG
-----------------------------------------------
log



⋅
0.260
62
---------------
30
0.258 62
⋅
+
30
---------------------------------------


log
⋅
1.8ms
==
=
E
HSD
V
BAT
V
DEMAG
+
R2
------------------------------------------------
LR I
0
V
DEMAG
V
DEMAG
I
0 R
⋅
+
V
DEMAG
-----------------------------------------------



log
⋅
–
⋅
⋅⋅
==
16
30
+
622
------------------- 0.260
62 0.258
30
–
30
0.258
+
62
⋅
30
---------------------------------------


log
⋅⋅
9.9mJ
=
⋅⋅
=



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