MP4021 LED DRIVER DOWNLOAD

Gate drive output pin. The output of the multiplier will be shaped as sinusoid too. This pin supply power both for control signal and the gate drive signal. 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. T Feedback signal Pin. Once the ZCD pin voltage is higher than 5. Figure 7 shows the leading edge blanking.

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During the blanking time, the path, CS Pin to the current comparator input, is blocked.

LED current can be accurately controlled with the real current control method form the primary side les. This pin supply power both for control signal and the gate drive signal. 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.

Once the ZCD pin voltage is higher than 5. Current return of the control signal and the gate drive signal. The output LED mean current can be calculated approximately as: Real Current Control The proprietary real current control method allows the MP controlling the secondary side LED current from the primary side information.

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If the voltage in this pin is higher than the current limit threshold 2. A feed-forward from the rectified voltage of the AC line is recommended to add to get an excellent line regulation. Internal thermal shutdown circuitry protects the device from permanent damage.

T The MP is under patent pending. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. ml4021

MP4021 Datasheet PDF

It can significantly simplify the LED lighting system design by eliminating the secondary side feedback components and the optocoupler. The high level voltage of this pin is clamped to 13V to avoid excessive gate drive ped. Then the power supply is taken over by the auxiliary winding. The output of the multiplier will be shaped as sinusoid too. Preliminary Specifications Subject to Mobile: The IC will shut down and restart again.

Connect this pin to an external bulk capacitor of typically 22uF with a pF ceramic cap to reduce the noise. It ensures high efficiency and low EMI noise.

To limit the input line voltage. N O The multi-protection function of MP can greatly enhance the system reliability and safety.

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MPS will not assume any legal responsibility for any said applications. The proprietary real current control method can control the LED current accurately from the primary side information. The output OVP setting point can be calculated as: 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.

The information in this document is subject to change without notice. High power factor can be maximum frequency and get a good EMI achieved. Zero current detection pin.

High power factor can also be achieved to eliminate the pollution to the AC line. If using lex 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. Figure 7 shows the leading edge blanking.