L292 datasheet(8/12 Pages) STMICROELECTRONICS

Part #	L292

Description	SWITCH-MODE DRIVER FOR DC MOTORS

PDF	12 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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8 / 12 page

CLOSED-LOOP SYSTEM STEP RESPONSE

a) Small - signals analysis.

The transfer function (3) can be written as follows:

) =

0.044

ω o

ξs + s2

ωo ω o 2

(7)

where wo =

√

Gmo Rs

R4 C RF CF

is the cutoff frequency

ξ =

√

R4 C

4 RF CF Gmo Rs

is the dumping factor

By choosing the

ξ value, it is possible to determine

the system response to an input step signal.

Examples :

ξ = 1 from which

(t)

0.044

[ 1

− e

−

2RF CF

(1 +

4 RF CF

) ] • Vi

(where Vi is the amplitude of the input step).

ξ =

√ 2

from which

(t) =

0.044

(1 − cos

2 RF CF

−

2 RF CF

) Vi

Fi gure 8. Small S ignal Step Response

(normalized amplitude vs.

t / RFCF).

V7 = 200 mV/div.

IM = 100 mA/div.

t = 100

µs/div.

with VI = 1.5 Vp.

8/12

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