L292(1993) Просмотр технического описания (PDF) - STMicroelectronics

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L292
(Rev.:1993)

SWITCH-MODE DRIVER FOR DC MOTORS

STMicroelectronics 

L292

Example :

a) Data

b) Calculation

c) Summarising

- Motors characteristics:

LM = 5 mH

RM = 5 W

LM / RM = 1msec

- Voltage and current characteristics:

Vs = 20 V

IM = 2 A

- Closed loop bandwidth : 3 kHz

VI = 9.1 V

- 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 :

fT

=

143 • 10−3

RF CF

= 3 kHz

- RC = 1.10-3 sec

-

1000 C

RF CF

=

1

- RF CF ≅ 47 µs

C = 47 nF

R = 22 KΩ

For RF = 510 Ω → CF = 92 nF

10/12

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