HIGH-VOLTAGE CIRCUITS
555 Timer Flyback Driver for High-Voltage Capacitor Charger
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CASE ANALYSIS
Scenario
A 555 timer in astable mode produces a square wave that switches an N-channel MOSFET, driving the primary of a flyback transformer to generate high-voltage pulses that are rectified and stored in a high-voltage capacitor.
Key decisions
- Use 555 timer astable with TRIG/THRES tied together for 50% duty gate drive
- An N-channel MOSFET grounds the flyback primary, allowing current to build and then interrupt for flyback pulse
- Rectifier diode steers the secondary flyback pulse into a high-voltage storage capacitor with a high-resistance bleeder
When to reuse this
Use for capacitor chargers, high-voltage bias supplies, and flyback converters that need an isolated step-up from a low-voltage DC rail.
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