PWM占空比计算器 — 公式

## Inverting Schmitt Trigger

### Formulas

**V_TH = V_sat+ x R1 / (R1 + R2)**

**V_TL = V_sat- x R1 / (R1 + R2)**

**Hysteresis = (V_sat+ - V_sat-) x R1 / (R1 + R2)**

The ratio R1/(R1+R2) sets the threshold as a fraction of the saturation voltages.

计算示例

Op-amp saturates at +/-12 V, R1 = 10k, R2 = 100k.

  1. V_TH = 12 x 10/110 = 1.091 V
  2. V_TL = -12 x 10/110 = -1.091 V
  3. Hysteresis = 24 x 10/110 = 2.182 V