I. Overview
This article describes an efficient LED driver that provides 12 V output voltage and 0.3 A output current drive over an input voltage range of 90 VAC to 265 VAC. The LED driver uses the LNK605DG device from Power Integrations' LinkSwitch-II family of ICs.
The topology used in this device is an isolated flyback that operates in discontinuous conduction mode. The output current control is completely detected from the primary side, eliminating the need for a secondary feedback component. There is also no need to detect external current on the primary side, but inside the IC, further reducing components and losses.
The LNK605DG also offers a variety of sophisticated protection features, including automatic restart in loop open loop or output short circuit conditions. Accurate hysteretic thermal shutdown ensures that the average PCB temperature is within safe limits under all conditions.
In LED lighting applications, end customers can experience a variety of performance attributes of the drive, including boot time and consistency between different drives. In this design, the LNK605DG device ensures uniformity between different drivers, with an output constant current tolerance of less than ±10% and fast start-up time of less than 5 ms for instant turn-on performance, long life and reliability. high.
Second, the circuit schematic
Third , the circuit analysis
The LinkSwitch-II device consists of an integrated controller and a 700V power MOSFET for LED driver or charger applications. LinkSwitch-II is configured for single-stage discontinuous conduction mode flyback topology, providing primary side regulated constant voltage and constant current output.
3.1 Input Filter
The AC input supply is rectified by the bridge rectifier BR1. The rectified DC is filtered by bulk capacitors C1 and C2. Inductors L1, C1, and C2 form a π-type filter that attenuates differential mode conducted EMI noise. This configuration, combined with the PowerIntegrations transformer's E-shieldTM technology, allows the design to meet EMI standard EN55015 Class B requirements without a Y capacitor and with a large margin. Transformer construction also enables very good EMI repeatability. The fuse resistor RF1 provides protection in the event of a power failure. This resistor typically requires a wire-wound resistor to withstand instantaneous power dissipation when first connected to the AC and the input capacitor is charged.
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Conductor
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