請問PI的工程師,TOP221系列的內部VLIMIT是多少伏啊?資料中沒找到
請問PI的工程師,TOP221系列的內部VLIMIT是多少伏啊?資料中沒找到
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@karlaugh
TOP221-7好像都是700V的
資料中有段時這么寫的:
Cycle-By-Cycle Current Limit
The cycle by cycle peak drain current limit circuit uses the
output MOSFET ON-resistance as a sense resistor. A current
limit comparator compares the output MOSFET ON-state drainsource
voltage, VDS(ON) with a threshold voltage. High drain
current causes VDS(ON) to exceed the threshold voltage and turns
the output MOSFET off until the start of the next clock cycle.
The current limit comparator threshold voltage is temperature
compensated to minimize variation of the effective peak current
limit due to temperature related changes in output MOSFET
RDS(ON).
我說的VLIMIT就是VDS(ON)的一個比較門限,導通時VDS(ON)應該不會太大,所以這個值也應該不會太大才對,不過資料中沒有標明這個值啊
Cycle-By-Cycle Current Limit
The cycle by cycle peak drain current limit circuit uses the
output MOSFET ON-resistance as a sense resistor. A current
limit comparator compares the output MOSFET ON-state drainsource
voltage, VDS(ON) with a threshold voltage. High drain
current causes VDS(ON) to exceed the threshold voltage and turns
the output MOSFET off until the start of the next clock cycle.
The current limit comparator threshold voltage is temperature
compensated to minimize variation of the effective peak current
limit due to temperature related changes in output MOSFET
RDS(ON).
我說的VLIMIT就是VDS(ON)的一個比較門限,導通時VDS(ON)應該不會太大,所以這個值也應該不會太大才對,不過資料中沒有標明這個值啊
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@c7140
資料中有段時這么寫的:Cycle-By-CycleCurrentLimitThecyclebycyclepeakdraincurrentlimitcircuitusestheoutputMOSFETON-resistanceasasenseresistor.AcurrentlimitcomparatorcomparestheoutputMOSFETON-statedrainsourcevoltage,VDS(ON)withathresholdvoltage.HighdraincurrentcausesVDS(ON)toexceedthethresholdvoltageandturnstheoutputMOSFEToffuntilthestartofthenextclockcycle.ThecurrentlimitcomparatorthresholdvoltageistemperaturecompensatedtominimizevariationoftheeffectivepeakcurrentlimitduetotemperaturerelatedchangesinoutputMOSFETRDS(ON).我說的VLIMIT就是VDS(ON)的一個比較門限,導通時VDS(ON)應該不會太大,所以這個值也應該不會太大才對,不過資料中沒有標明這個值啊
你要知道這個干什么,通態漏源電壓一般取10V
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@c7140
資料中有段時這么寫的:Cycle-By-CycleCurrentLimitThecyclebycyclepeakdraincurrentlimitcircuitusestheoutputMOSFETON-resistanceasasenseresistor.AcurrentlimitcomparatorcomparestheoutputMOSFETON-statedrainsourcevoltage,VDS(ON)withathresholdvoltage.HighdraincurrentcausesVDS(ON)toexceedthethresholdvoltageandturnstheoutputMOSFEToffuntilthestartofthenextclockcycle.ThecurrentlimitcomparatorthresholdvoltageistemperaturecompensatedtominimizevariationoftheeffectivepeakcurrentlimitduetotemperaturerelatedchangesinoutputMOSFETRDS(ON).我說的VLIMIT就是VDS(ON)的一個比較門限,導通時VDS(ON)應該不會太大,所以這個值也應該不會太大才對,不過資料中沒有標明這個值啊
屬于IC內部參數
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