Pin8 SS ---[4.7µF]--- GND
Pin 8 connects to a capacitor (1 μF to 10 μF) to slowly ramp up duty cycle at startup. Pin 16 (SYNC) is often left unconnected but can accept an external TTL clock to synchronize multiple converters. 4. Complete Application Schematic (Outer Circuit) Below is the textual reconstruction of a typical Rm1-2316-based flyback power supply as found in an HP spectrum analyzer: Rm1-2316 Schematic
For a forward or flyback converter, pins 9 and 10 drive a low-side MOSFET; pins 11 and 12 (if used) drive a synchronous rectifier. The schematic typically shows resistors (10-50Ω) in series with each gate to dampen ringing. Pin8 SS ---[4
Pins 3 (RC) and 4 (CT) connect to an external resistor (10 kΩ typical) and capacitor (1 nF to 10 nF), setting the switching frequency between 50 kHz and 200 kHz. The oscillator then feeds a pulse-width modulator with adjustable duty cycle from 0% to 85%. Complete Application Schematic (Outer Circuit) Below is the
Understanding the teaches timeless lessons in isolated power supply design: current-mode control, optocoupler feedback, soft-start, and transformer-coupled feedback. Moreover, it empowers you to repair rather than scrap expensive equipment. By studying the external circuit, you can diagnose faults, design a modern substitute, or even build your own high-performance DC-DC converter.