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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LD7830GS датащи(PDF) 13 Page - Leadtrend Technology |
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LD7830GS датащи(HTML) 13 Page - Leadtrend Technology |
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13 / 18 page  LD7830 13 Leadtrend Technology Corporation www.leadtrend.com.tw LD7830-DS-01a August 2012 VCC UVLO(on) UVLO(off) t t COMP OLP t OUT OLP Delay Time Switching Switching Non-Switching OLP trip Level 4nd UVLO(off) OLP Counter Reset Fig. 19 OVP (Over Voltage Protection) on Vcc The maximum rating of the VCC pin is limited below 29V. To prevent VCC from the fault condition, the LD7830 is implemented with OVP function on Vcc pin. As soon as the Vcc voltage is over OVP threshold voltage, the output gate drive circuit will be shutdown simultaneously thus to stop the switching of the power MOSFET until the next UVLO(on). The Vcc OVP function of the LD7830 is an auto-recovery protection. The Fig. 20 shows its operation. Upon removal of the OVP condition will resume the Vcc level and the output operation VCC UVLO(on) UVLO(off) t OVP Tripped t OUT Switching Switching Non-Switching OVP Level Fig. 20 Fault Protection There are several critical protections were integrated in the LD7830 to prevent the power supply or adapter from being damaged. Those damages usually come from open or short condition caused to LD7830. Once it happens in below condition, the gate output will turn off immediately to protect the power circuit --- 1. Comp pin floating 2. CS pin floating |
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