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参数资料
| 型号： | TPD4008KLBF |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PZFM23 |
| 封装： | 1.27 MM PITCH, PLASTIC, HZIP-23 |
| 文件页数： | 2/24页 |
| 文件大小： | 510K |
| 代理商： | TPD4008KLBF |
TPD4008K
2001-05-31
10
Description of Protection Function
(1)
Overcurrent
Overcurrent protection function in this IC detects voltage generated in the current detection
resistor connected to the IS pin. When this voltage exceeds VR = 0.5 V (typ.), the high-side IGBT
output, which is on, temporarily shuts down after a mask period (approx. 1 s), preventing any
additional current from flowing to the IC. The next PWM ON signal releases the shutdown state.
(2)
Undervoltage
When the VCC power supply falls to the IC internal setting (VCCUVD = 7.5 V typ.), all IGBT
outputs shut down regardless of the input. This protection function has hysteresis. When the
VCCUVR (= 8.0 V typ.) reaches 0.5 V higher than the shutdown voltage, the IC is automatically
restored and the IGBT is turned on again by the input.
(3)
Overheating
When the temperature of this chip rises due to external causes or internal heat generation and the
internal setting TSD reaches 165°C, all IGBT outputs shut down regardless of the input. This
protection function has hysteresis (TSD = 10°C typ.). When the chip temperature falls to TSD
TSD, the chip is automatically restored and the IGBT is turned on again by the input.
Because the chip contains just one temperature detection location, when the chip heats up due to
the IGBT, for example, the differences in distance from the detection location in the IGBT (the source
of the heat) cause differences in the time taken for shutdown to occur.
Duty ON
Overcurrent setting
PWM reference voltage
Duty OFF
tOFF
tON
Mask period
+ tOFF
Overcurrent shutdown
Retry
Triangle wave
Output current
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