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参数资料
| 型号： | TA8473FG |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 1.2 A, PDSO16 |
| 封装： | 0.225 INCH, 1 MM PITCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件页数： | 8/13页 |
| 文件大小： | 411K |
| 代理商： | TA8473FG |
TA8473F/FG/FN/FNG
2006-3-2
4
The peak level can be represented as follows :
Vpeak = 5 240 k (1ref1 × Rref / RVR 1ref2)
Here,
1ref1 = 1ref2 = 100 A Typ.
RVR = RTH + Ra
In addition, only positive values within parentheses ( ) are valid. The value of Vpeak is between 1 V and 5 V.
The thermistor resistance, RTH, is generally shown as follows :
RTH (Ta) = Ro × EXPB (1 / Ta1 / To)
Ro : Resistance () when reference temperature To (normally, 25°C= 298K)
Ta : Ambient temperature (K)
B
: Characteristic temperature (K)
As the above equation shows, the thermistor has a negative temperature characteristic for ambient
temperature, Ta. The resistance drops at high temperature. Using this characteristic, lowering the Vpeak
value at high temperature runs the motor at full speed ; raising the value at low temperature reduces the
number of fan rotations with the maximum offtime.
The number of rotations begins to increase from the minimum when RVR ≤ Rref, reaching the motor’s full
speed when RVR is about 0.85 × Rref.
<Example 1>
When a thermistor with characteristics B = 4200 K and Ro = 10 k (at Ta = 25°C) is used without other
resistors, the motor speed slows down at 25°C or lower if Rref = 10 k, and is at full speed at 30°C or
higher if RTH = 8.5 k.
<Example 2>
When resistors are connected in series to the thermistor and RVR composite resistance is obtained, the
resistance change ratio drops :
1
<
R
/
R
δ
R
/
R
δ
TH
VR
Therefore, there is a wide range for the number of the rotations.
(4) Miscellaneous
The thermistor should be connected to where the temperature is detected. Consequently, the thermistor may
be located away from the IC. In this case, if the wire from the thermistor is accidentally disconnected, the
TH terminal opens and rotation control switches to the lowspeed condition.
To deal with this situation, TA8473F/FG and TA8473FN/FNG are designed so that when the thermistor wire
is disconnected, the motor runs at full speed.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TA8473FN/FNG | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:FAN MOTOR DRIVER IC |
| TA8473FNG(5) | 制造商:Toshiba America Electronic Components 功能描述: |
| TA8474FG(5) | 制造商:Toshiba America Electronic Components 功能描述: |
| TA8479F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:3 PHASE FULL WAVE BRUSHLESS DC MOTOR DRIVER IC FOR VIDEO CAMERA |
| TA848 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:The TA848 is a highly integrated low cost current mode PWM controller, which is ideal for small power current mode of offline AC-DC fly-back converter applications. |
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