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參數(shù)資料
| 型號(hào)： | 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(dòng)器（DMOS的驅(qū)動(dòng)程序） |
| 文件頁數(shù)： | 6/14頁 |
| 文件大小： | 355K |
| 代理商： | M63151FP |
M63151FP
Rev.1.0, Sep.16.2003, page 6 of 13
Precautions during Use
Protection from overheating:
The impedance between the power supply and output pins of the circuit board is low when the IC is in use.
Contingencies such as the application of excessive voltage by voltage surges may lead to short-circuits forming
between the output pins of the IC can lead to damage which includes destruction of the TSD module. The chip is then
liable to catch fire. Accordingly, we strongly recommend that you consider the application of safety measures such as
fuses.
Dissipation of heat:
Sufficient thermal evaluation must be performed before changes to the thermal environment (including power-supply
voltage, output current, the circuit board, etc.). The new design must be brought within the margins for thermal
dissipation. Also, note that a higher carrier frequency setting leads to a larger level of IC-internal switching loss.
Wiring on the board:
Within the IC, the output current flows through the current-sense resistor (in the 0.17-
level), and current control is
applied when a fall in this voltage is detected. Also, since the flow of output current is for a high-speed switching
operation, take care to avoid the generation of crosstalk between the wiring which carries the current and the wiring
which is connected to the high-impedance input pins (Hall output)
,
etc.
The motor-lock protection circuit:
Holding of the motor by some external or other factor leads to a continuous flow of the maximum current to the IC. The
IC is thus equipped with a module that detects this condition; at specified intervals after the condition has been
detected, the module stops the flow of current to the motor and automatically attempts to resumes operation. The time
constant set by the resistor and capacitor which are externally connected to pins 37 and 38 determines the time from
when the maximum current begins to flow until the motor is stopped; the same R and C values set the time from
stopping to restarting of the motor. Make sure that the specified interval is longer than the time the motor takes to start
up.
When the motor characteristics and setting for maximum current are such that the maximum current is exceeded when
the duty cycle is 75% (RS voltage high period: low period = 3:1) or more, the IC judges that the maximum current is
not continuously flowing. In such a case, this protection circuit does not operate.
If the IC junction temperature rises before or during the operation of this protective circuit, the overheat-protection
circuit operation takes precedence.
Short circuits between output pins and adjacent pins
This IC does not incorporate protection against short-circuits between pins. An attempt to output a current while there
is a short-circuit between an output and VCC or ground, an output and VREG, or VCC and VREG may cause an over-
current to flow; this may adversely affect the IC.
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