MP4021 LED DRIVER DOWNLOAD
January 13, 2019
Zero current detection pin. Figure 7 shows the leading edge blanking. Current return of the control signal and the gate drive signal. T Feedback signal Pin. 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. This pin supply power both for control signal and the gate drive signal. Gate drive output pin.
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MP4021 Datasheet PDF
N O The multi-protection function of MP can greatly enhance the system reliability and safety. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.
The high level voltage of this pin is clamped to 13V to avoid excessive gate drive voltage. This pin supply power both for control signal and the gate drive signal.
LED current can be accurately controlled with the real current control method form the primary side information. Figure 7 shows the leading edge blanking. The information in this document is subject to change without notice.
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T The Ped is under patent pending. It ensures high efficiency and low EMI noise. The output OVP setting point can be calculated as: Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. If using primary side control, this pin can be NC. During the blanking time, the path, CS Pin to the current comparator input, is blocked.
The half-wave sinusoid signal in this pin is provided lex reference signal for the internal current control loop.
Unauthorized Photocopy and Duplication Prohibited. The IC will shut down and restart again. The output Eld mean current can be calculated approximately as: F The extremely low start-up current and the quiescent current can reduce the power consumption thus lead to an excellent efficiency performance.
T Feedback signal Pin. Connect this pin to an external bulk capacitor of typically 22uF with a pF ceramic cap to reduce the noise. 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.
High power factor can also be achieved to eliminate the pollution to the AC line. Once the ZCD pin voltage is higher than 5.
Preliminary Specifications Subject to Mobile: 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 mpp4021 winding see Figure 2. Current return of the 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 jp4021, the OVP sample is shown in figure 8. High power factor can be maximum frequency and get a good EMI achieved. Internal thermal shutdown circuitry protects the device from permanent damage. Connects this pin to the tap of resistor divider from the rectified voltage of the AC mp021. MPS will not assume any legal responsibility for any said applications.
Zero current detection pin.
Then the power supply is taken over by the auxiliary winding. A feed-forward from the rectified lfd of the AC line is recommended to add to get an excellent line regulation. Gate drive output pin. The proprietary real current control method can control the LED current accurately from the primary side information.
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.