L6256 データシートの表示（PDF） - STMicroelectronics

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L6256

12V COMBO

STMicroelectronics 

L6256

TYPICAL APPLICATION DIAGRAM

SPINDLE

SP_CLK SP_C

SP_B SP_A

C_TAP

vpwr

nPOR

PWM

BEMF_DET

SCLK

SDIO

RSLEW R_SLEW

100KΩ

C2 47nF

POR_RC

nPOR

RPWM PWM_IN

33KΩ

BEMF_DET

SCLK

SDIO

SP_CLK SP_C

5

3

8

9

10

11

12

13

14

SP_P1

2

+

VCC V

-

RS

1.5Ω

3.3V

C3

22µF

esr 0.5Ω

RDIO 1.2KΩ

VCC

15

5V_GND

17

RREF2 120KΩ

RREF

62.5KΩ

REF_IN

35

QDRIVE

20

CUR_IN

22

VREG_IN

21

BYPASSC

16

Cbyp

10nF

33

H_VPWR

CHVPWR

100nF

37

FF_COMP

Cffc

470pF

SP_B

1

4

SP_G1

SP_A SP_P2 C_TAP

43

42

41

VC_PWR

24

CP_CAP D4

19

CPCAP

2.2µF

35V

18

CP_OUT

34

CPOUT 33nF

VDD

32

DAC

31

IO_VC

A_IN

30

PARK Rp1 51KΩ

27

A_OUT

25

Rp2

100KΩ

I_VC

26

B_OUT

23

44

6,7,29,39,40

SP_G2

GND

SH_OUT

38

Rsh

100KΩ

PWM_DC

36

28

CSELB

Rpwindc

100KΩ

CSelB (from µP)

D97IN573

C1

4.7µF

25V

D5

D1

+

V VDD

-

Ra

1.5KΩ

Rb

4.3KΩ

Rfb

120KΩ

Cfb

390pF

RSENSE

0.75Ω

I_VC

B_OUT

VCM

Csh

3.3nF

Cdc

10nF

DESIGN FORMULAS:

1. Spindle Run Mode Slew Rate:

SR

=

1500 ⋅ 103

Rslew

(Volts

/µs)

2. Feedforward Compensation:

Fpwm

=

1

Tpwm

=

Cffc

1

⋅ Rslew

(Hz)

Dout

=

Tpwm

Tpwm+ 0.7µs

⋅

Vref

Vrslew

⋅

Din

Vref =

Rpwmdc

Rpwm

⋅ 2.47

(V)

Vrslew =

(Vpwr + 0.8)

1.86

(V)

Fpwm = PWM chopping frequency

Din = Input duty cycle at pwm_in

Dout = Spindle output duty cycle

4/28

3. Current Limit:

Ilimit

=

20

⋅

103

⋅

Vcc

Rref

(A)

4. BEMF Zero Crossing Detector:

- Slope Compensation: Csh ⋅ Rsh =

5.9683

(sec)

Vbemf = Amplitude of bemf

Vbemf⋅ N

N = Run mode speed of the motor in RPM

- Window width:

tw in =

15404

⋅

Vcc ⋅

Rref +

Rref

Rref2

⋅

Vbemf

⋅

N

⋅

Polepair

(µs)

5. VCM PARKING VOLTAGE:

VA,park

=

0.5

⋅







1

+

Rp2

Rp1







(V)

6. 3.3V REGULATOR:

Max Load Current:

IMAX

=

0.3

Rs

(A)

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