HV9906DB4

HV9906DB4 Off-Line Current Source Controller Introduction The HV9906DB4 provides a constant current of 750mA. It contains all circuitry necessary to demonstrate the features of the HV9906 second order power supply controller. A power converter of the demo board consists of an input buck-boost stage and an output buck stage. The output voltage polarity is negative. Due to its unique quadratic input-tooutput DC voltage transfer ratio, the converter can operate directly off AC line to produce low-voltage output without need for electrolytic capacitors. The HV9906 is designed for optimally controlling this type of power converter or other types of two-stage multiconverters. The board is optimized for driving a 10V-20V, 750mA load. However, it may be modified to meet custom requirements (up to 80V or 1.5A). HV9906DB4 demo board features passive power factor correction to PF>0.95, open circuit protection and under voltage lockout. Specification Input Voltage Output Current Output Voltage Efficiency 80 to 135VAC, 60Hz 750mA ±10% 20V Max 64% at Io=750mA, Vin=100VAC Board Layout and Connections TOP SIDE BOTTOM SIDE 80-135 VAC Radj (external) 80-135 VAC Radj (external) WARNING!!! Do not connect to scope ground or to the ground of other earth-grounded instruments. Doing so will short the AC line, resulting in damage to the circuit and/or instruments. Either use an isolation transformer on the AC line, use a differential probe, or use a floating, battery-powered instrument to make ...