AP1682 LED DRIVER

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 and keep output voltage below the maximum output voltage limit value under no load or load disconnection conditions. 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. Functional Block Diagram of AP 4. The AP have a wide operating voltage window from 8V to 30V. Transformer Winding Construction Diagram Apr. Transformer Electrical Schematic Diagram Apr. 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.

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W2 Shielding winding Start at Pin 6.

The latch mode will be reset after input power recycle. Materials Item Description 1 Core: Massachusetts Institute of Technology.

(PDF) AP1682 Datasheet download

FB voltage is used to control no load output voltage and determine acceleration stop point at start-up phase. A ceramic capacitor C3 is paralleled between VS pin and Ground to bypass the high lsd noise.

On the other hand, if the output voltage is the lower, the KP value should be set as the higher, so that the higher diode rectifier conduction duty cycle, the lower primary peak current, and the higher conversion efficiency. Functional Block Diagram of AP 4. 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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Basic Operation Waveforms Apr.

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

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

Current return for gate driver and control circuits of the IC. EE Mark Randall Lab 7. When open load condition or load disconnecting happens, ler output voltage rises to the maximum value and the FB pin voltage reaches 4V. Wind another 39 Primary winding turns on the next layer from right to left.

Too high capacitance will result in the distortion of sine waveform current reference, and then the worse Power Factor. 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 most components of Flyback and Buck-Boost have same Apr. EF16, PC40 or equivalent 2 Bobbin: 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 and keep output voltage below the maximum output voltage limit value under no load or load disconnection conditions.

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Data sheet, Mechanical dimensions soic-8 unit: mm(inch) | Diodes AP User Manual | Page 10 / 11

The pin is qp1682 the oed sine waveform peak value of input voltage. It is assumed that the secondary diode forward voltage drop Vd is about 0. The primary current sense pin. The circuit structure and operation principle of Buck-Boost converter with AP is very similar to the Flyback. The rectified input voltage sensing pin. Since the R8 and R9 value is much less than line compensation resistor value, the R20 is about half of line compensation value, 10M. The pin is detecting the rectified sine waveform peak value of input voltage.

Figure 4 shows the FB pin working regions. Load Regulation of Output Current 7. It also has rich protection features including over voltage, short circuit, over current, over temperature protection. The CS pin peak value at one half line cycle should be set as 1V. Common connection of GND will introduce disturbances to small signals.

In order to achieve the DC average value of half rectified sine waveform, the low pass filter is necessary. FB Function Region Diagram 4.