器件名称: DI-58
功能描述: Low Cost 1.5 W CV/CC Charger or Adapter
文件大小: 366.23KB 共2页
简 介:Design Idea DI-58 LinkSwitch Low Cost 1.5 W
CV/CC Charger or Adapter
Application Charger/Adapter Device LNK500 Power Output 1.5 W Input Voltage 85-265 VAC Output Voltage 5.5 V Topology Flyback
Design Highlights
Replaces a linear transformer based supply at the same or lower cost but with much higher performance <0.3 W consumption at zero load meets worldwide guidelines (EC’s 0.3 W, USA’s 1 W for example) Extremely simple circuit – only 15 components for production-worthy design Primary based CV/CC output – no secondary sense components required ±10% output voltage and ±25% output current tolerances at peak power point Fully protected for thermal, short circuit and open loop faults >62% efficiency (>70% with R1 replaced by an inductor) Meets CISPR22B/EN55022B EMI limits with low cost resistive input filter Ultra-low leakage current design <5 A EE13 core for low cost and small size
LinkSwitch derives all feedback information from the primary. During output diode conduction, the output voltage reflected through the turns ratio is sampled and held by C4. The feedback voltage across C4 (VOR) is converted into feedback current by R2 and fed into the CONTROL pin. This feedback current regulates the output by PWM control during CV operation, and by reducing the internal current limit during CC operation. Below an output voltage of ~2 V, LinkSwitch enters auto-restart, limiting average output current to less than 50 mA. The nominal transition from CV to CC occurs at 5.5 V,……
