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L6256 数据表(PDF) 4 Page - STMicroelectronics

部件名 L6256
功能描述  12V COMBO
PDF  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6256 数据表(HTML) 4 Page - STMicroelectronics

  L6256 Datasheet HTML 1Page - STMicroelectronics L6256 Datasheet HTML 2Page - STMicroelectronics L6256 Datasheet HTML 3Page - STMicroelectronics L6256 Datasheet HTML 4Page - STMicroelectronics L6256 Datasheet HTML 5Page - STMicroelectronics L6256 Datasheet HTML 6Page - STMicroelectronics L6256 Datasheet HTML 7Page - STMicroelectronics L6256 Datasheet HTML 8Page - STMicroelectronics L6256 Datasheet HTML 9Page - STMicroelectronics Next Button
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6,7,29,39,40
GND
RSLEW
100K
Ω
POR_RC
C2 47nF
BEMF_DET
12
9
8
SCLK
13
nPOR
10
V
+
-
VCC
14
SDIO
RDIO 1.2K
Ω
15
VCC
20
QDRIVE
RS
1.5
Ω
21
VREG_IN
22
CUR_IN
C3
22
µF
esr 0.5
Ω
17
5V_GND
VC_PWR
35
REF_IN
RREF
62.5K
Ω
RREF2
120K
Ω
18
CP_OUT
19
24
CP_CAP
R_SLEW
RPWM
33K
Ω
11
PWM_IN
BYPASSC
Cbyp
10nF
16
V
+
-
VDD
4
SP_G1
44
SP_G2
CPOUT 33nF
D4
D5
CPCAP
2.2
µF
35V
D1
34
VDD
C1
4.7
µF
25V
41
43
1
3
SP_C
SP_B
SP_A
C_TAP
42
SP_P2
CHVPWR
100nF
33
H_VPWR
32
DAC
Rb
4.3K
Ω
31
IO_VC
Ra
1.5K
Ω
30
A_IN
27
25
PARK
A_OUT
Rp1 51KΩ
Rp2
100K
Ω
Cfb
390pF
Rfb
120K
Ω
RSENSE
0.75
Ω
26
I_VC
23
B_OUT
2
SP_P1
SPINDLE
Cffc
470pF
37
FF_COMP
38
Csh
3.3nF
Rsh
100K
Ω
SH_OUT
36
Cdc
10nF
Rpwindc
100K
Ω
PWM_DC
5
SP_CLK
28
CSELB
PWM
nPOR
D97IN573
VCM
SP_CLK
SP_C
SP_B
SP_A
C_TAP
I_VC
B_OUT
BEMF_DET
SCLK
SDIO
vpwr
3.3V
CSelB (from
µP)
TYPICAL APPLICATION DIAGRAM
DESIGN FORMULAS:
1. Spindle Run Mode Slew Rate:
SR
=
1500
⋅ 10
3
Rslew
(Volts /µs
)
2. Feedforward Compensation:
Fpwm
=
1
Tpwm
=
1
Cffc
⋅ Rslew
(Hz
)
Dout
=
Tpwm
Tpwm
+ 0.7µs
⋅
Vref
Vrslew
⋅ Din
V
ref
=
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
3. Current Limit: Ilimit
= 20 ⋅ 103 ⋅
Vcc
Rref
(A)
4. BEMF Zero Crossing Detector:
- Slope Compensation: Csh
⋅ Rsh =
5.9683
Vbemf
⋅ N
(sec)
Vbemf = Amplitude of bemf
N
= Run mode speed of the motor in RPM
- Window width:
twin
= 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)
L6256
4/28



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