请问PI的工程师,TOP221系列的内部VLIMIT是多少伏啊?资料中没找到
请问PI的工程师,TOP221系列的内部VLIMIT是多少伏啊?资料中没找到
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@karlaugh
TOP221-7好像都是700V的
资料中有段时这么写的:
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).
我说的VLIMIT就是VDS(ON)的一个比较门限,导通时VDS(ON)应该不会太大,所以这个值也应该不会太大才对,不过资料中没有标明这个值啊
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).
我说的VLIMIT就是VDS(ON)的一个比较门限,导通时VDS(ON)应该不会太大,所以这个值也应该不会太大才对,不过资料中没有标明这个值啊
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@c7140
资料中有段时这么写的:Cycle-By-CycleCurrentLimitThecyclebycyclepeakdraincurrentlimitcircuitusestheoutputMOSFETON-resistanceasasenseresistor.AcurrentlimitcomparatorcomparestheoutputMOSFETON-statedrainsourcevoltage,VDS(ON)withathresholdvoltage.HighdraincurrentcausesVDS(ON)toexceedthethresholdvoltageandturnstheoutputMOSFEToffuntilthestartofthenextclockcycle.ThecurrentlimitcomparatorthresholdvoltageistemperaturecompensatedtominimizevariationoftheeffectivepeakcurrentlimitduetotemperaturerelatedchangesinoutputMOSFETRDS(ON).我说的VLIMIT就是VDS(ON)的一个比较门限,导通时VDS(ON)应该不会太大,所以这个值也应该不会太大才对,不过资料中没有标明这个值啊
你要知道这个干什么,通态漏源电压一般取10V
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@c7140
资料中有段时这么写的:Cycle-By-CycleCurrentLimitThecyclebycyclepeakdraincurrentlimitcircuitusestheoutputMOSFETON-resistanceasasenseresistor.AcurrentlimitcomparatorcomparestheoutputMOSFETON-statedrainsourcevoltage,VDS(ON)withathresholdvoltage.HighdraincurrentcausesVDS(ON)toexceedthethresholdvoltageandturnstheoutputMOSFEToffuntilthestartofthenextclockcycle.ThecurrentlimitcomparatorthresholdvoltageistemperaturecompensatedtominimizevariationoftheeffectivepeakcurrentlimitduetotemperaturerelatedchangesinoutputMOSFETRDS(ON).我说的VLIMIT就是VDS(ON)的一个比较门限,导通时VDS(ON)应该不会太大,所以这个值也应该不会太大才对,不过资料中没有标明这个值啊
属于IC内部参数
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