AN892 Datasheet, PDF (6/16 Pages) Silicon Laboratories – DESIGN GUIDE FOR ISOLATED DC/DC USING THE

AN892
2.6. Diode and Output Capacitor
Current flows through D1 only during the (1–D)T_SW portion of the steady state cycle. During the DT_SW portion of
the cycle, l_LOAD is sourced solely by the output capacitor C10. Output voltage ripple on C10 can be calculated by
V_{OUT RIPPLE} = ^I--^L---^O----^A--_C--^D---₁-^D--₀--^T----^S----^W--
Equation 21.
Applying the charge balance of C10,
–I_LOADDT_SW + 1 – DT_SW= 0
Equation 22.
I_{D1  AVE1 – D} = I_LOAD---₁-----–¹----_D-----_
Equation 23.
When D1 is reversed biased, it must withstand
V_{D1 REVD} = V_IN1 – DN + V_OUT
Equation 24.
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