Design of 10 to 20W LED straight tube lamp drive circuit based on AP3766

Publisher:dong125612Latest update time:2010-11-24 Keywords:AP3766  LED Reading articles on mobile phones Scan QR code
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AP3766 Overview

AP3766 is the latest LED driver control chip launched by BCD. It uses primary side regulation control (PSR) technology to achieve high-precision constant voltage/constant current (CV/CC) output, eliminating the secondary side optocoupler and constant voltage and constant current control circuit, and does not require a loop compensation circuit to achieve stable control of the circuit. It uses a small SOT-23-6 package, which significantly reduces the system size and reduces the system cost. AP3766 has a patented "sub-microampere starting current" technology, which reduces system power consumption and improves efficiency. It can make the efficiency greater than 80% and the no-load power consumption less than 30mW. AP3766 has built-in external component temperature change compensation and constant current CC tightening technology to achieve vertical CC characteristics, ensuring ±5% output constant current accuracy under mass production. At the same time, AP3766 has built-in soft start, overvoltage protection, and short circuit protection functions to improve system reliability.

AP3766 has strong system adaptability and can be used with passive PFC current-following circuits, output totem pole drive circuits and other peripheral circuits to meet high power factor requirements and higher power output. Therefore, AP3766 can be used not only in GU10 spotlights and E27 bulbs, but also in PAR lamps, straight tube lamps, etc.

Figure 1 is the pin diagram of AP3766.

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Figure 1. AP3766 pin diagram

10 to 20W LED straight tube lamp solution

For higher power ED straight tube lamp applications, AP3766 can expand the output power range by adding an external push-pull circuit. Figure 10 is the circuit diagram of this solution.

Figure 10 Schematic diagram of the driving circuit of the LED straight tube lamp solution based on AP3766

In Figure 10, F1 is a fuse, and L1, C11, L2, and C12 form common-mode and differential-mode EMI filters. C2, C3, D3, D4, and D6 form a flow-by-flow circuit to achieve the power factor correction function. After the flow-by-flow circuit, the flyback switching power supply circuit composed of T1, Q1, D1, and C5 completes the isolation output and voltage transformation functions, and the control chip U1 realizes the switch control function of the flyback switching power supply circuit. The flyback switching power supply circuit has the advantages of simple circuit structure, safe isolation, and low cost, and is particularly suitable for the requirements of low-power LED drive power supply. The flyback switching power supply circuit using the primary side switch control method eliminates the secondary side output constant current and constant voltage detection circuit and optocoupler device, further reducing the cost and improving the system reliability and cost performance.

In Figure 10, resistors R1 and R2 are the startup resistors of chip U1, which are connected to the VCC pin of the chip to provide a certain amount of startup current to the chip. D5, R11, and C9 constitute the absorption circuit of the flyback switching power supply circuit, which absorbs the peak voltage on the switch after the switch Q1 is turned off. Na is the auxiliary winding, which forms the power supply circuit of chip U1 with D2, R6, and C4. At the same time, the auxiliary winding voltage is divided by resistors R10 and R9 and connected to the FB pin of the chip as the output voltage detection and open circuit protection circuit.

R5A and R5B are the current detection resistors of switch Q1, which are connected to the CS pin of the chip after passing through R4, i.e. the current sampling pin of U1. Pin 1 of chip U1 is the output drive pin, which is connected to the gate of MOS tube Q1 after amplifying the drive energy through the voltage regulator tube Z1 and the totem pole drive circuit composed of Q2 and Q3, and controls the on and off of switch Q1.

Figure 11 is a photo of a 13W LED driver circuit based on AP3766.

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Figure 11. Photo of a 13W LED driver circuit based on AP3766

The test results of the main performance indicators of the circuit are shown in Table 1:

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The test results show that under 230V input voltage, the power factor PF is about 0.8 and the efficiency is greater than 85%, which meets the specifications of LED driver power supply.

Keywords:AP3766  LED Reference address:Design of 10 to 20W LED straight tube lamp drive circuit based on AP3766

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