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AN2208 Datasheet(PDF) 19 Page - STMicroelectronics

Part # AN2208
Description  Designing Industrial Applications with
PDF  51 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2208 Datasheet(HTML) 19 Page - STMicroelectronics

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AN2208
4 Load switching tests
19/51
The parameters are given by the following formulas:
For example for VN808:
Where, IOUT = 0.5 A, L = 130 mH, f = 0.5 Hz, VCC = 24 V and VCLAMP = 52 V
VCLAMP - VCC = 28 V and RLOAD = 48 Ω
tOFF = 1.6 ms
EOFF = 21 mJ per channel
Note:
For more information about switching inductor loads, see Application Note AN1351.
Figure 17. IPS simplified structure
GND
OUT
VCC
High Side Switch
S1
ZD1
50V
Ai11609
t
OFF
L
R
LOAD
------------------
1
V
CC
V
CLAMP
V
CC
–
---------------------------------------
+


ln
•
=
E
OFF
V
CLAMP
R
LOAD
---------------------
LV
CC
•
R
LOAD
--------------------
V
CLAMP
V
CC
–
() t
OFF
•
()
–


•
=
P
t
OFF
E
OFF
t
OFF
--------------
=
P
t
OFF
4
21mJ
1.6ms
-----------------
•
52.5W
=
=



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