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ZETA Converter Calculator

Design and analyze ZETA (non-inverting buck-boost) DC-DC converters for power electronics.

Enter Design Parameters

ZETA Converter Circuit

ZETA Converter Circuit

Input Voltage (V_in):

Output Voltage (V_out):

Output Power (P_out) [W]:

Switching Frequency (Hz):

Ripple (%):

Enter all parameters and click Calculate.

ZETA Converter Examples

Example 1: Step-Up Mode (Matches Reference/Excel)

Given: V_in=12V, V_out=24V, P_out=48W, Ripple=10%, f_sw=100kHz

Duty Cycle: D = 24/(12+24) = 0.667 or 66.7%
Output Current: I_out = 48/24 = 2.00A
Current Ripple (ΔI): 0.1 × 2 = 0.2A
Voltage Ripple (ΔV): 0.1 × 24 = 2.4V
Inductor (L1=L2): (12×0.667)/(0.2×100000) = 0.0004 H = 400 µH
Capacitor (C1=C2): 0.2/(4×100000×2.4) = 0.000208 µF = 208 nF
Load Resistor: 24/2 = 12 Ω

Example 2: Step-Down Mode

Given: V_in=24V, V_out=12V, P_out=60W, Ripple=15%, f_sw=75kHz

Duty Cycle: D = 12/(24+12) = 0.333 or 33.3%
Output Current: I_out = 60/12 = 5.00A
Current Ripple (ΔI): 0.15 × 5 = 0.75A
Voltage Ripple (ΔV): 0.15 × 12 = 1.8V
Inductor (L1=L2): (24×0.333)/(0.75×75000) = 0.000142 H = 142 µH
Capacitor (C1=C2): 0.75/(4×75000×1.8) = 0.001389 µF = 1.39 nF
Load Resistor: 12/5 = 2.4 Ω

Example 3: Moderate Step-Up

Given: V_in=20V, V_out=60V, P_out=72W, Ripple=10%, f_sw=50kHz

Duty Cycle: D = 60/(20+60) = 0.75 or 75%
Output Current: I_out = 72/60 = 1.20A
Current Ripple (ΔI): 0.1 × 1.2 = 0.12A
Voltage Ripple (ΔV): 0.1 × 60 = 6V
Inductor (L1=L2): (20×0.75)/(0.12×50000) = 0.0025 H = 2500 µH
Capacitor (C1=C2): 0.12/(4×50000×6) = 0.0001 µF = 100 nF
Load Resistor: 60/1.2 = 50 Ω