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| 型號： | SA56202 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | One-chip motor driver |
| 中文描述： | 單芯片電機驅(qū)動器 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 117K |
| 代理商： | SA56202 |
9397 750 12772
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Preliminary data sheet
Rev. 01 — 19 July 2004
8 of 24
Philips Semiconductors
SA56202
One-chip motor driver
Figure 6
depicts the motor voltages V
M1
and V
M2
during accelerating and braking. The
back-EMF voltage is part of these motor voltages.
7.3 Sine generation using True-Silent signals
For the phase relation between the Hall inputs and the spindle outputs in forward rotation,
see
Figure 7
. These are the signal shapes in sine mode using our True-Silent PWM
technology. The particular shape of the 120
°
symmetrical U, V and W steering voltages
are because of improved drive strength and improved power efficiency. The drive strength
is improved because with this signal shape a 15 % larger sine can be fit within the supply
rails compared to direct-written sine signals. Also the power efficiency is improved
because this signal shape has 33 % less switching losses compared to a direct-written
sine.
The result is that the motor currents (and motor torques) are pure sine waves generated in
such a way that the motor is driven optimally silent, optimally power efficient and with
maximum driving strength.
Fig 6.
Motor voltages when accelerating and braking with constant motor current.
001aaa432
V
M2
accelerating
braking
V
RM
V
RM
V
M1
V
M1
V
M2
V
EMF
2
V
EMF
2
V
DD(SPN)
2
V
DD(SPN)
0
0
ω
max
ω
ω
0
k
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