器件名称: DI-12
功能描述: 16 W, Universal Input, Lead Acid Battery Charger
文件大小: 44.71KB 共2页
简 介:Design Idea DI-12 TOPSwitch-GX 16 W, Universal
Input, Lead Acid Battery Charger
Application Battery Charger Device TOP244P Power Output 16 W Input Voltage 85-265 VAC Output Voltage 13.55 V at 25 C Topology Flyback
Design Highlights
Lowest cost and low component count solution Universal input voltage replaces the need for multiple linear based designs High efficiency: >75% Integrated line undervoltage detection (UV) and overvoltage (OV) power system surge protection Constant voltage / constant current (CV/CC) output Temperature compensated output voltage Monitor input to allow state of charge measurements
TOP244P requires no external heatsink, using the PC board instead. During the first 10 ms of operation, internal soft-start is enabled, lowering stresses on the internal power MOSFET, clamp and output rectifier. Built-in switching frequency jitter reduces conducted EMI, allowing the design to meet EN55022B limits with simple input filtering. Diode D1 and Zener VR1 clamp the leading edge drain voltage spike caused by transformer leakage inductance. Lead acid batteries for standby use are normally charged at ~2.3 V per cell and 0.1 A per Ah of capacity. Resistor R1, U2, C9, Q1, R3, R4 and R5 form the current limit circuit. Resistor R3 controls the current limit (1.2 A typical). Resistor R5 ensures sufficient voltage to drive the opto LED, even with the output shorted. Capacitor C9 and R4 provide compensation and limit Q1 base current. The output voltage is controlle……