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L292 数据表(PDF) 10 Page - STMicroelectronics

部件名 L292
功能描述  SWITCH-MODE DRIVER FOR DC MOTORS
PDF  12 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L292 数据表(HTML) 10 Page - STMicroelectronics

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Example :
a) Data
- Motors characteristics:
LM = 5 mH
RM = 5 W
LM / RM = 1msec
- Voltage and current characteristics:
Vs = 20 V
IM = 2 A
VI = 9.1 V
- Closed loop bandwidth : 3 kHz
b) Calculation
- From relationship (4) :
Rs
=
0.044
IM
VI
= 0.2 Ω
and from (1) :
Gmo
=
2VS
RM VR
= 1 Ω −1
- RC = 1 msec [from expression (2) ].
- Assuming
ξ = 1/ √2 ; from (7) follows :
ξ2 =
1
2
=
400 C
4RF CF • 0.2
- The cutoff frequency is :
f T
=
143
• 10−3
RF CF
= 3 kHz
c) Summarising
- RC = 1.10-3 sec
-
1000 C
RF CF
= 1
- RF CF
≅ 47 µs
C = 47 nF
R = 22 K
Ω
For RF = 510
Ω → CF = 92 nF
10/12
L292



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