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| 型号： | TC655EUN |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 18/36页 |
| 文件大小： | 706K |
| 代理商： | TC655EUN |
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2002 Microchip Technology Inc.
DS21734A-page 25
TC654/TC655
MOSFETs are very low, the TC654/TC655 can charge
and discharge them very quickly, leading to very fast
edges. Of key concern is the turn-off edge of the MOS-
FET. Since the fan motor winding is essentially an
inductor, once the MOSFET is turned off, the current
that was flowing through the motor wants to continue to
flow. If the fan does not have internal clamp diodes
around the windings of the motor, there is no path for
this current to flow through, and the voltage at the drain
of the MOSFET may rise until the drain to source rating
of the MOSFET is exceeded. This will most likely cause
the MOSFET to go into avalanche mode. Since there is
very little energy in this occurrence, it will probably not
fail the device, but it would be a long term reliability
issue. The following is recommended:
Ask how the fan is designed. If the fan has clamp
diodes internally, you will not experience this
problem. If the fan does not have internal clamp
diodes, it is a good idea to put one externally
(Figure 7-8). You can also put a resistor between
VOUT and the gate of the MOSFET, which will help
slow down the turn-off and limit this condition.
FIGURE 7-7:
Output Drive Device Configurations.
TABLE 7-2:
FAN DRIVE DEVICE SELECTION TABLE (NOTE 2)
Device
Package
Max Vbe sat /
Vgs(V)
Min hfe
Vce/VDS
Fan Current
(mA)
Suggested
Rbase (ohms)
MMBT2222A
SOT-23
1.2
50
40
150
800
MPS2222A
TO-92
1.2
50
40
150
800
MPS6602
TO-92
1.2
50
40
500
301
SI2302
SOT-23
2.5
NA
20
500
MGSF1N02E
SOT-23
2.5
NA
20
500
SI4410
SO-8
4.5
NA
30
1000
SI2308
SOT-23
4.5
NA
60
500
Note 1: A series gate resistor may be used in order to control the MOSFET turn-on and turn-off times.
2: These drive devices are suggestions only. Fan currents listed are for individual fans.
Q1
GND
VDD
RSENSE
RBASE
VOUT
FAN
a) Single Bipolar Transistor
Q1
GND
VDD
RSENSE
VOUT
b) N-Channel MOSFET
FAN
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相关代理商/技术参数 |
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|---|---|
| TC655EUNTR | 功能描述:软开关 PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
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| TC65I | 制造商:CINTERION 功能描述:MODULE GSM/GPRS QUADBAND + JAVA TC65I 制造商:CINTERION 功能描述:MOD, GSM / GPRS, QUAD BAND, TCP/IP 制造商:CINTERION 功能描述:MOD, GSM / GPRS, QUAD BAND, I2C, SPI, USB, TCP/IP; No. of Channels:4; Supply Voltage Min:3.2V; Supply Voltage Max:4.5V; Frequency RF:1900MHz; Module Interface:I2C, SPI, USB; RF Coax Type:1.9 GHz; Supply Voltage Range:3.2V to 4.5V ;RoHS Compliant: Yes |
| TC65I L30960-N1150-A100 | 制造商:Gemalto 功能描述: |
| TC65I X GPIO TERMINAL | 制造商:MC TECHNOLOGIES 功能描述:MOD QUADBAND GPIO JAVA TERMIN 制造商:MC TECHNOLOGIES 功能描述:MOD, QUADBAND GPIO JAVA TERMINAL 制造商:MC TECHNOLOGIES 功能描述:MOD, QUADBAND GPIO JAVA TERMINAL; No. of Channels:4; Protocol:TCP / IP; Supply Voltage Min:8V; Supply Voltage Max:30V; Frequency RF:1.9GHz; Module Interface:RS232; Kit Features:GPRS upto 86kbps, Data CSD upto 14.4kbps, Secure Data ;RoHS Compliant: Yes |
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