AP1682 LED DRIVER

Physics Lab 5 Prelab Exercise: Pin Configuration and Description The AP features low start-up current, low operation current and high efficiency. Wind another 39 Primary winding turns on the next layer from right to left. It is assumed that the secondary diode forward voltage drop Vd is about 0. FB voltage is used to control no load output voltage and determine acceleration stop point at start up phase. Supply voltage of gate driver and control circuits of the IC.

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The pin is detecting the instantaneous rectified sine waveform of input voltage 3 VPK The rectified input voltage peak value sensing pin.

The transformer design should be based on the worst case operation condition. FB voltage is used to control no load output voltage and determine acceleration stop point at start-up phase 6 GND Ground.

Design Guideline and Application Notes of AP1682 System Solution

Wind another 39 Primary winding turns on the next layer from right to left. When open load condition or load disconnecting happens, the output voltage rises to the maximum value and the FB pin voltage reaches 4V. Glue[8] core and bobbin Core short to Pin5 7. W1 Start at Pin 3. Load Regulation of Output Current 7. FB Function Region Diagram 4. From the transformer relationship between primary parameter and secondary parameter, it can be got: Figure 4 shows the FB pin working regions.

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The FB pin resistor divider is used to detect output voltage so that the power board can operate at no load condition.

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

This pin captures the feedback voltage from the auxiliary winding. 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. It is assumed that the secondary diode forward voltage drop Vd is about 0. In a half line cycle, the operation parameters, such like DC bus voltage, primary peak current, duty cycle, etc.

Current return for gate driver and control circuits of the IC. The Lsd start-up voltage threshold is It also eliminates the need of loop compensation circuitry while maintaining stability.

From the above equations it can be got: This will lead to AP latch working mode. Operation Parameter Components Selection Design design method. Primary side of the bobbin is placed on the left hand ldd, and secondary side of the bobbin is placed on the right hand side.

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The design specification is 8. The ap168 mode will be reset after input power recycle. The primary OCP comparator 4. A ceramic capacitor C3 is paralleled between VS pin and Ground to bypass the high frequency noise.

Transformer Winding Construction Diagram Apr. So the capacitor less than pF value is recommended. Design Example Nominal DC output voltage: High Voltage Demo Boards. In LED lighting application, because lwd LED cell forward voltage drop VF varies with different current and operation temperature, the output voltage need a wider operation range. In order to achieve the DC average value of half rectified sine waveform, the low pass filter is necessary.

The pin is detecting the instantaneous rectified sine waveform of input voltage. The output loading uses 4 pieces LED cells in series. The AP achieves excellent regulation and wp1682 efficiency, yet meets the requirement of IEC harmonic standard.

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