Forward · when to use — Voltage Regulation

Forward · when to use

CCM sketch · shared engine · Analog Intuition chrome

VIN and VOUT are the job, including sign. Green in the table = that cell can convert it. This row is highlighted.

VIN V VOUT V

Isolation

Topology	Job	VIN port	VOUT port

CCM duty for this cell

→ —

\[ V_{\mathrm{out}} = V_{\mathrm{in}}(N_s/N_p)D \]

→ —

Duty is computed from VIN and |VOUT| for this topology even if the job does not fit — so you can see why the ratio cannot get you there.

Forward vs flyback · same VIN, VOUT, N

Enter any three of VIN, VOUT, N = N_p/N_s, D. Forward is a buck with a transformer: \(V_{\mathrm{out}}=V_{\mathrm{in}}(N_s/N_p)D\). Flyback uses \(D/(1-D)\).

VIN V VOUT V N = N_p/N_s D forward D flyback V_SW peak typ. 2 VIN

Forward: D = VOUT · N / VIN. Resonant reset (LT8310 Cres on the drain) can run D past 50 %.