This pin supply power both for control signal and the gate drive signal. High power factor can also be achieved to eliminate the pollution to the AC line. During the blanking time, the path, CS Pin to the current comparator input, is blocked. Then the power supply is taken over by the auxiliary winding. A feed-forward from the rectified voltage of the AC line is recommended to add to get an excellent line regulation. The positive plateau of auxiliary winding voltage is proportional to the output voltage, the OVP uses the auxiliary winding voltage instead of directly monitoring the output voltage, the OVP sample is shown in figure 8.
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MP4021 Datasheet PDF
The output of the multiplier will be shaped as sinusoid too. The high level voltage of this pin is clamped to 13V to avoid excessive gate drive voltage. Preliminary Specifications Subject to Mobile: If the voltage in this pin is higher than the current limit threshold 2.
Figure 7 shows the leading edge blanking. During the blanking time, the path, CS Pin to the current comparator input, is blocked. When the external MOSFET turns off, the energy stored in the inductor forces the secondary side diode to be turn-on, and the current of the inductor begins to decrease linearly from the peak value to zero.
Unauthorized Photocopy and Duplication Prohibited. If using primary side control, this pin can be NC.
The positive plateau of auxiliary winding voltage is proportional to the output voltage, the OVP uses lde auxiliary winding mo4021 instead of directly monitoring the output voltage, the OVP sample is shown in figure 8. To limit the input line voltage. Once the ZCD pin voltage is higher than 5. High power factor can also be achieved to eliminate the pollution to the AC line.
The proprietary real current control method can control the LED current accurately from the primary side information.
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The output OVP setting point can be calculated as: Then the power supply is taken over by the auxiliary winding. The information in this document is subject to change without notice. Real Current Control The proprietary real current control method allows the MP controlling the secondary side LED current from the primary side information. Internal thermal shutdown circuitry protects the device from permanent damage. A feed-forward from the rectified voltage of the AC line is recommended to add to get an excellent line regulation.
Connects this pin to the tap of resistor divider from the rectified voltage of the AC line. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the optocoupler.
The IC will shut down and restart again. LED current can be accurately controlled with the real current control method form the primary side information. When the current decreases to zero, the parasitic resonant of inductor and all the parasitic capacitance makes the MOSFET drain-source voltage decrease, this decreasing is also reflected on the auxiliary winding see Figure 2.
It ensures high efficiency and ml4021 EMI noise.
N O The multi-protection function of MP can greatly enhance the system reliability and safety. High power factor can be maximum frequency and get a good EMI achieved. Over-voltage condition lwd detected through ZCD, if ZCD voltage is higher than the overvoltage-protection OVP threshold after a blanking time 1us, the over-voltage condition is detected.
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T The MP is under patent pending. F The extremely low start-up current and the quiescent current can reduce the power consumption thus lead to an excellent efficiency performance. Zero current detection pin. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application.
Gate drive output pin.