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LV5026MC
Sense resistor is obtained as follows.
Rs =
VREF_IN
Ipk_p
=
VREF_IN × Lp
Vac × Ton_p
=
VREF_IN × Lp
Vac × Don_p × T
(16)
[Inductance Ls of secondary side]
Since output current Iout is the average value of current flows to transformer of secondary side
× 2=
Iout = Ipk_s ×
Ton_s
T
1
Ipk_s × Don_s
2
( Don_s =
Ton_s
T
= Ton_s × ? osc )
(17)
Ipk_s = Ls × Ton_s = Ls =
Vout         Vout
Don_s
? osc
(18)
Ls =
Vout × T × Don_s 2
2 × Iout
=
Vout × Don_s 2
2 × Iout × ? osc
=
Vout 2 × Don_s 2
2 × Pout × ? osc
(19)
Calculation of the ratio of transformer coil on primary side and secondary side
Since ratio and inductance of transformer coil is
Ns √ Ls
Np = √ Lp
(20)
substituted equations (15), (19) for (20)
∴ Ns = Vout × √ η × Don_s
Np  Vac      Don_p
(21)
Calculation of transformer coil on primary side and secondary side
N =
Vac × 10 8
2 × Δ B × Ae × ? osc
(22)
Δ B: variation range of core flux density [Gauss]
Ae: core section area [cm 2 ]
To use Al (L value at 100T),
√ Al × 10
N =
L 2
(23)
L: inductance [ μ H]
Al: L value at 100T [uH/N 2 ]
lg (Air gap) is obtained as follows:
lg =
μ r μ 0 N 2 A e 10 2
L
(24)
μ r: relative magnetic permeability, μ r = 1
μ 0: vacuum magnetic permeability μ 0 = 4 π *10 -7
N: turn count [T]
Ae: core section area [m 2 ]
L: inductance [H]
No.A2042-9/16
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