L7250 datasheet(36/46 Pages) STMICROELECTRONICS

部件名	L7250

功能描述	5V & 12V SPINDLE AND VCM MOTORS DRIVER

PDF	46 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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36 / 46 page

L7250

36/46

Figure 14. Costant voltage retract operation at power down

Figure 15. Two step unload temporization

C o ns t a nt V o lt a g e

R e tra c t O p e r a t io n

Ch e c k NP O R

S tatus

Hig h

Lo w

Ch e c k V C M

Ac tiv e Br a k e Pr o c .

Re g .0 1 H -b it[0 ]

D is a b led

E n ab le d

G e t R ltim e r [2 :0 ]

Re a d R e g .0 1 H

R ltim e r [2:0] = “000 ”

S tar t O N L Y U n lo ad1

w it h th e se le cte d

Rlv o lta g e1

R ltim e r [2:0] = “111 ”

S tar t O N L Y U n lo ad2

w it h th e se le cte d

Rlv o lta g e2

Ye s

S tar t U n lo ad1 + U n lo a d 2

w it h th e se le cte d

Rlv o lta g e1 & R lv o lta g e2

S tar t t h e V C M

Ac tiv e Br a k e

P r oc ed ur e

EN D

(* )

Se t Sp in d le P o w e r s

in TR I S TA T E

Wa it E N D

of R ltim e r

Se t Sp in d le P o w e r s

in BR AK E

Voltage

Capacitor

pin 21

Time

Step 1

Step 2

POR

Programming

Threshold

End Unload

Threshold

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