L292 datasheet(11/13 Pages) STMICROELECTRONICS

Part #	L292

Description	SWITCH-MODE DRIVER FOR DC MOTORS

PDF	13 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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11 / 13 page

11/13

L292

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) :

and from (1) :

RC = 1 msec [from expression (2) ]

Assuming

ξ = 1/

; from (7) follows :

The cutoff frequency is :

c) Summarising

0.044

--------------- V

0.2

Ω

M VR

----------------

Ω

–

---

400 C

F CF

0.2

⋅

--------------------------------

143 10

–

⋅

F CF

--------------------------

3kHz

– C = 1.10

–

sec

1000 C

F CF

------------------ = 1

–

F CF

µs

≅

–











C = 47nF

R = 22 K

Ω

For R

F = 510 Ω

F = 92nF

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