Switching (SMPS) vs Linear Power Supplies
Nearly all modern chargers are Switching Mode Power Supplies (SMPS) due to high efficiency and compact size. However, Linear Power Supplies remain the gold standard for high-end audio DACs, preamps, and sensitive RF communications.
Switch-Mode Power Supply
Converts AC mains to high-frequency DC pulses (50kHz – 1MHz+), passes it through a miniature transformer, and rectifies it.
- ✓ Efficiency: 85% – 95% (generates minimal waste heat)
- ✓ Size & Weight: Ultra-compact, lightweight (pocket-sized GaN)
- ✓ Input Range: Universal 100V–240V AC worldwide
- ⚠️ Drawback: High-frequency switching ripple noise (10mV–100mV)
Linear Power Supply
Steps down mains AC with a heavy iron toroidal transformer, rectifies with diodes, and regulates via a linear transistor burning off excess voltage as heat.
- ✓ Noise Floor: Ultra-quiet, zero high-frequency EMI (< 5µV ripple)
- ✓ Transient Response: Instantaneous response without switching delay
- ⚠️ Efficiency: Low (30% – 60%, dissipates excess as heat)
- ⚠️ Size & Weight: Heavy iron transformer, requires large aluminum heatsinks
Detailed Technical Feature Comparison
| Parameter | Switching Mode (SMPS) | Linear Power Supply (LPS) |
|---|---|---|
| Electrical Efficiency | 85% – 95% | 30% – 60% |
| Output Noise & Ripple | Moderate (10–100 mV peak-to-peak high frequency) | Ultra-low (< 10 µV RMS) |
| Physical Weight | Extremely Light (~100g – 300g) | Heavy (~1kg – 5kg iron transformer) |
| Heat Generation | Runs cool to warm | Hot (requires heavy heatsinking) |
| Ideal Use Case | Laptops, phones, routers, monitors, LED lighting | Studio DACs, phono preamps, amateur radio receivers |
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