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參數(shù)資料
| 型號(hào)： | SA56202TW |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 光電元器件 |
| 英文描述： | One-chip motor driver |
| 中文描述： | CD MOTOR DRIVER, PDSO56 |
| 封裝： | 6.10 MM, PLASTIC, SOT793-1, HTSSOP-56 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 117K |
| 代理商： | SA56202TW |
9397 750 12772
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Preliminary data sheet
Rev. 01 — 19 July 2004
6 of 24
Philips Semiconductors
SA56202
One-chip motor driver
7.
Functional description
7.1 Spindle motor control
The control input voltage on pin VINSPN is converted into a digital value by the ADC
where the voltage on pin VINREF is the midpoint reference. The transconductance gain
from input voltage V
VINSPN
to output motor current I
MOT
is:
where I
LIM
can be programmed by means of external resistor R
LIM
; see
Section 7.4
. The
motor current is described by
Figure 3
.
For VINSPN voltages larger than V
VINREF
the motor will accelerate with forward torque
control. For VINSPN voltages smaller than V
VINREF
the motor will brake with reverse
torque control. Because the U, V and W half-bridges of the spindle motor driver use a
direct PWM full-bridge switching scheme, the motor current can also be controlled and
limited during brake. Note that because of this active brake mechanism energy of the
motor can be recuperated back to the supply. Especially at large speeds, this can result in
currents delivered back to the supply. If the supply and/or other circuits than the motor
VINTLT
VINTRK
VINFCS
VINLD
V
SS(DIO)
DIODE
COSC
50
51
52
53
54
55
56
tilting driver input for tilt actuator voltage
tracking driver input for tracking actuator voltage
focus driver input for focus actuator voltage
loading driver input for loading motor voltage
temperature diode ground
diode for temperature readout
external capacitor for internal oscillator
Table 2:
Symbol
Pin description
…continued
Pin
Description
Fig 3.
Spindle motor current as a function of control input voltage on pin VINSPN.
g
m
(
SPN
)
I
–
V
VINSPN
V
VINREF
------------------------------------------------
I
V
VINREF
---------------------
=
=
001aaa431
I
LIM
I
MOT
V
VINSPN
I
LIM
reverse
torque
brake
0
V
VINREF
2V
VINREF
forward
torque
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