The output LED mean current can be calculated approximately as: If the voltage in this pin is higher than the current limit threshold 2. Preliminary Specifications Subject to Mobile: The proprietary real current control method can control the LED current accurately from the primary side information. It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the optocoupler.
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T Feedback signal Pin. Real Current Control The proprietary real current control method allows the MP controlling the secondary side LED current from the primary side information. High power factor can also be achieved to eliminate the pollution to the AC line.
If the voltage in this pin is higher than the current limit threshold 2. Figure 7 shows the leading edge blanking. When the current decreases to zero, the parasitic resonant of inductor and jp4021 the parasitic capacitance makes the MOSFET drain-source voltage decrease, this decreasing is also reflected on the auxiliary winding see Figure 2. The information in this document is subject to change without notice. Then the power supply is taken over by the auxiliary winding. N O The multi-protection function of MP can greatly enhance the m;4021 reliability and safety.
Zero current detection pin. LED current can be accurately controlled with the real current control method form the primary side information.
It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the optocoupler. Unauthorized Photocopy and Duplication Prohibited.
The proprietary real current control method can control the LED current accurately from the primary side information. It ensures high efficiency and low EMI noise. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. The IC will shut down and restart again. The output OVP setting point can be calculated as: T The MP is under patent pending. MPS will not assume any legal responsibility for any said applications.
If using primary side control, this pin can be NC. Over-voltage condition is 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. Current return of the control signal and the gate drive signal. To limit the input line voltage.
MP4021 Datasheet PDF
Gate drive output pin. The high level voltage of this pin is clamped to 13V to avoid excessive gate drive voltage. A feed-forward from the rectified voltage of the AC line is recommended to add to get an excellent line regulation.
ldd Connects this pin to the tap of resistor divider from the rectified voltage of the AC line. The output of the multiplier will be shaped as sinusoid too.
This signal provides the reference Minimum Off Time for the current comparator and comparing with The MP operates with variable switching the primary side inductor current which sets the frequency, the frequency is changing with the primary peak current shaped as sinusoid with the input instantaneous line voltage.
When the external MOSFET mp421 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.
Internal thermal shutdown circuitry protects the device from permanent damage. The output LED mean current can be calculated approximately as: Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application.
Once the ZCD pin voltage is higher than 5.