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LD7576JPN 数据表(PDF) 13 Page - Leadtrend Technology |
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LD7576JPN 数据表(HTML) 13 Page - Leadtrend Technology |
13 / 22 page LD7576/76H/76J/76K 13 Leadtrend Technology Corporation www.leadtrend.com.tw LD7576-DS-04a December 2009 VCC UVLO(on) UVLO(off) t t COMP OLP 5.0V t OUT OLP Delay Time Switching Switching Non-Switching OLP trip Level 2nd UVLO(off) OLP Counter Reset Fig. 17 UVLO(on) UVLO(off) t AC input Voltage t OUT Switching Switching Non- Switching t VCC t 5.0V COMP PDR(8V) AC Off AC On( Recycle) Latch Released OLP Delay Time OLP trip Level Fig. 18 OVP (Over Voltage Protection) on Vcc - Auto Recovery The maximum VGS ratings of the power MOSFETs are mostly for 30V. To prevent the VGS enter fault condition, LD7576X series is implemented with OVP function on Vcc. Whenever the Vcc voltage is higher than the OVP threshold, the output gate drive circuit will be shutdown simultaneously and the switching of the power MOSFET is disabled until the next UVLO(on). The Vcc OVP functions of LD7576/76J are auto-recoverable. If the OVP condition, usually caused by open-loop of feedback, is not released, the Vcc will trip the OVP level again and re-shutdown the output. The Vcc works in hiccup mode as shown in Figure 19. Otherwise, when the OVP condition is removed, the Vcc level will be resumed and the output will automatically return to the normal operation. OVP (Over Voltage Protection) on Vcc - Latch mode Similar with the behavior for OLP latch-mode, whenever the voltage on the Vcc pin is higher than the OVP threshold, the output gate drive circuit will be shut down simultaneously to latch off the switching of the power MOSFET. As soon as the voltage on Vcc pin drops below OVP threshold and starts AC-recycling again, it will recover to normal operation. Figure 20 shows its operation. Fig. 19 |
类似零件编号 - LD7576JPN |
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类似说明 - LD7576JPN |
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