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參數(shù)資料
| 型號： | M63151FP |
| 廠商： | Renesas Technology Corp. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Polygon Scanner Motor Driver (DMOS Driver) |
| 中文描述： | 多邊形掃描電機(jī)驅(qū)動器（DMOS的驅(qū)動程序） |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 355K |
| 代理商： | M63151FP |
M63151FP
Rev.1.0, Sep.16.2003, page 9 of 13
Motor Lock Protection Circuit (2)
The time intervals in the block diagram on the previous page are set up in the following ways.
(1) Current-limiting control signal low period
The flow of the limiting current to the RNF pin is detected, and the motor is regenaratively operated over the period
indicated below:
Toff = C1 x V1
÷
LI
= 17.5pF x 1V
÷
6.25
μ
A
=
2.8
μ
s
Note, however, that a delay time of about 0.5
μ
s from the time when the high-side or low-side of a phase is turned off
to the time when the output of the opposite side is turned on is set in the pre-drive stage of output. This prevents
through current to and from upper and lower transistors within the same phase. Accordingly, the output voltage off
period (regenerative time) is 0.5
μ
s plus the result of the above calculation, which is about 3.3
μ
s.
(2) Operation time of the motor-lock protection circuit
The following equation gives the time from locking of the motor to stoppage of current flow.
TML-ON = C x R x ln ((Vreg – R x I)
÷
((Vreg – R x I) – V3))
= 1
μ
F x 4.7 M
x ln ((6 V – 4.7 M
x 17 nA
÷
((6 V – 4.7 M
x 17 nA) – 5.4V))
= 11.42 s
Similarly, the period from the time when the motor is turned off to automatic resumption is:
TML-OFF = C x R x ln ((V3 – 0.7 V – R x I)
÷
(V4-7V))
= 1
μ
F x 4.7 M
x ln (5.4 V – 0.7 V – 4.7 M
x 17 nA
÷
1.2 V – 0.7 V)
= 10.45 s
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