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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： | 多邊形掃描電機驅(qū)動器（DMOS的驅(qū)動程序） |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 355K |
| 代理商： | M63151FP |
M63151FP
Rev.1.0, Sep.16.2003, page 8 of 13
Motor-Lock Protection Circuit (1)
As well as the overheating protection function, this IC incorporates a module that turns off current to the motor after the
motor has been mechanically held over a specified period. This prevents overheating. The operating conditions of this
module and a timing chart that depicts its operation are given below. Note, however, that when the IC does become
overheated, the overheating protection circuit still operates because it takes precedence over the lock protection
function.
(1) Conditions of operation
(a)
The RS current detection resistor detects a continuous flow of the limit current (in practice, the current-limiting
circuit leaves the IC operating as long as the voltage on RS stays within the range 0 to 0.25 V).
(b)
Normally, the period at 0 V in item (a) will be 3.5
μ
s, and this is approximately equal to the period at 0.25 V.
However, this circuit does not operate when motor characteristics, etc. mean that the period at 0.25 V is three times
the period at 0 V (duty cycle = 75%) or longer.
(c)
The period of the lock-protection circuit operations (the period from locking of the motor to the time when current
to the motor is stopped) is determined by the time constant set up by the capacitor and resistor externally connected
to pins 37 (CRLP) and 38 (RLP).
(d)
After the motor has been turned off, automatic resumption is attempted at a time determined by the same R and C
values as in point (c). External signals are not accepted until resumption.
(2) Block diagram
+
-
+
-
+
-
0.25V
1V
Hi: PWM-ON
Lo: PWM-OFF
(Regeneration)
4V
5.4V
or
1.2
Hi: Normal operation
Low: MOTOR - lock protection circuit
0.25V
Lock protection
circuit control signal
17
38
37
VREG(6V)
VREG
Comp1
Comp2
Comp3
Comp4
A
0
Current limiting
control signal
5.4V
1.2V
POINT A
RNF
RFP
CRLP
CRLP
RNF
Comp3 output
1V
0
0.7V
4V
C=1
μ
F
R=4.7M
C1
↓
I1
Current - Limiting
control signal
Lock protection circuit
control signal
Currnt flows to
the motor
Flow of current to
the motor stops
Currnt flows to
the motor
↑
Initiation
When the maximum current no longer flows to the RNF,
the CRLP voltage is driven low to cancel the protective finction.
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