L292 Просмотр технического описания (PDF) - STMicroelectronics

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L292

SWITCH-MODE DRIVER FOR DC MOTORS

STMicroelectronics 

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----.-0----4---4--

IM

V

I

=

0.2 Ω

and from (1) :

Gmo

=

---2----V----S-----

RMVR

=

1 Ω–1

RC = 1 msec [from expression (2) ]

Assuming ξ = 1/ 2 ; from (7) follows :

ξ2

=

1--

2

=

---------4---0----0----C-----------

4RFCF ⋅ 0.2

The cutoff frequency is :

fT

=

1----4---3-----⋅---1---0----–---3-

RFCF

=

3kHz

c) Summarising

–RC = 1.10–3sec





C = 47nF

–-1---0---0---0----C--- = 1

RFCF

–RFCF ≅ 47µs



 R = 22 K Ω





For RF

= 510Ω → CF

= 92nF



L292

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