Too high capacitance will result in the distortion of sine waveform current reference, and then the worse Power Factor. There are always output capacitors to filter the ripple in Flyback topology, so the output voltage ripple depends on the total output capacitance. From the Figure 3. Load Regulation of Output Current 7. When open load condition or load disconnecting happens, the output voltage rises to the maximum value and the FB pin voltage reaches 4V. Functional Block Diagram of AP 4. W1 Start at Pin 3.

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In order to achieve the DC average value of half rectified sine waveform, the low pass filter is necessary. FB voltage is used to control no load output voltage and determine acceleration stop point at start-up phase 6 GND Ground.

In LED lighting application, because the LED cell forward voltage drop VF varies with different current and operation temperature, the output voltage need a wider operation range. The FB pin resistor divider is used to detect output voltage so that the power board can operate at no load condition. The primary OCP comparator 4.

Materials Item Description 1 Core: Therefore the VCC voltage which comes from aux winding coupling with transformer winding also needs the wider operating voltage range. Basic Operation Waveforms Apr.

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This will lead to AP latch working mode.

Data sheet, Pin configuration, Pin description | Diodes AP User Manual | Page 2 / 11

BCD will release a1682 AP design sheet tools for both Flyback and Buck-Boost application to meet the all types of application requirements. Current return for gate driver and control circuits of the IC.

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.

Insulation 2 Layers of insulation tape [7], 0. So designer need fine-tune these design parameters to match the real design. It also eliminates the need of loop compensation circuitry while maintaining stability. W3 Secondary Winding Start at white terminal. Figure 4 shows the FB pin working regions.

From the transformer relationship between primary ap11682 and secondary parameter, it can be got: The pin is detecting the instantaneous rectified sine waveform of input voltage. FB voltage is used to control no load output voltage and determine acceleration stop point at start-up phase. Finish on Pin 2. Glue[8] core and bobbin Core short to Pin5 7.

(PDF) AP1682 Datasheet download

Review of LR circuits. The pin is detecting the rectified sine waveform peak value of input voltage.

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Current return for gate driver and control circuits of the IC. In a half line cycle, the operation parameters, such like DC bus voltage, primary peak current, duty cycle, etc. Massachusetts Ldd of Technology. The rectified input voltage peak value sensing pin.

This pin captures the feedback voltage from the auxiliary winding.

AP Datasheet pdf – Single Stage Primary Side Regulation PFC Controller For LED Driver – Diodes

The primary current sense pin. Functional Block Diagram of AP 4.

As shown in Figure 5 and Figure 6, comparing to the Flyback application, the Buck-Boost converter has only inductor instead of transformer, has not primary snubber circuit. Common connection of GND will introduce disturbances to small signals.

Data sheet, Pin configuration, Pin description – Diodes AP1682 User Manual

At start-up phase, after VCC voltage reaches turn on threshold, AP controls the power converter operating at the max frequency with DCM Boundary mode to provide more energy to output. Use Voltage Divider Rule to find 1. Load Regulation of Output Current 7.