AP1682 LED DRIVER DOWNLOAD

The pin is detecting the rectified sine waveform peak value of input voltage 4 CS Primary current sensing 5 FB This pin captures the feedback voltage from the auxiliary winding. The output loading uses 4 pieces LED cells in series. Since of PFC operation and the special PFM control technology, the circuit operation parameter of Flyback converter is little different with the traditional off-line Flyback converter. W4 Auxiliary winding Start at Pin 5. Basic Operation Waveforms Apr. From above output current equation it is concluded that the output current has the double line frequency AC components, which results in the double line frequency output voltage and output current ripple.

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The AP start-up voltage threshold is Primary side of the bobbin is placed on the left hand side, and secondary side of the bobbin is placed on the right hand side. Figure 4 shows the FB pin working regions. Functional Block Diagram of AP 4. Documents Flashcards Grammar checker. The output current is constant regardless of output voltage changing.

The primary current sense resistor value is one of design inputs for output constant current value setting according to equation FB voltage is used to control no load output voltage and determine acceleration stop point at start up phase.

Common connection of GND will introduce disturbances to small signals. Complain wrong Brand wrong Model non readable.

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Design Guideline and Application Notes of AP1682 System Solution

Massachusetts Institute of Technology. The pin is detecting the rectified sine waveform peak value of input voltage. The most components of Flyback and Buck-Boost have same Apr.

From above output current equation it is concluded that the output current has the double line frequency AC components, which results in the double line frequency output voltage and output current ripple.

The pin is detecting the instantaneous rectified sine waveform of input voltage. This pin captures the lrd voltage from the auxiliary winding.

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Experiment Kirchoff s Laws. The compensation circuit should meet Because VPK pin senses the peak value of sine waveforms, a low pass filter is required to get the average value of sine waveform voltage. Current return for gate driver and control circuits of the IC.

In pa1682 to achieve the DC average value of half rectified sine waveform, the low pass filter is necessary. Insulation 2 Layers of insulation tape [7], 0. The rectified input voltage peak value sensing pin. The output loading uses 4 pieces LED cells in series.

Design Guideline and Application Notes of AP System Solution

Certainly, the efficiency and BOM cost are also the important factors for components selection. So the capacitor less than pF value is recommended. Basic Operation Waveforms Apr. When open load condition or load disconnecting happens, the ap182 voltage rises to the maximum value and the FB pin voltage reaches 4V.

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From the Figure 3. The rectified input voltage peak value sensing pin. Assume VCC auxiliary winding is tightly coupled with primary and secondary winding, the auxiliary winding voltage is 34 By sensing FB pin voltage, the LED driver can work at HICCUP mode ap1862 keep output voltage below the maximum output voltage limit value under no load or load disconnection conditions.

Materials Item Description 1 Core: Insulation 1 Layer of insulation tape [7], 0. The FB pin resistor divider is used to detect output voltage so that the power board can operate at no load condition. There are always output capacitors to filter lwd ripple in Flyback topology, so the output voltage ripple depends on the total output capacitance. Since ked PFC operation and the special PFM control technology, the circuit operation parameter of Flyback converter is little different with the traditional off-line Flyback converter.

This application notes emphasis on the Flyback power converter design with AP

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