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LV5026MC
(for Isolation circuit)
Using the circuit diagram below, the wave form of the current that flows to Np and Ns is as follows.
Current waveform flows to primary side and secondary.
Vac
Ip
a blockdiagram in outline
LP
(Np)
Ls
(Ns)
(Primary side current)
Vac
REF_IN
Q
R1
Vzd
REF_IN
CS
+
-
-
CLK
RESET
OUT
VREF (0.605V)typ
Ip (primary side)
Ip slope is proportion to
VREF
Vac voltage (REF pin voltage)
R2
(0.605V typ)
Rcs
FET
T
ON
OFF
Is
(Secondary side current)
Is (Secondary side current)
T
Ipk_p
Primary
side
FET_ON
Ip = Vac/Lp × Ton_p
FET_OFF
Ipk_p = Vac/Lp × Ton_p
(Ton_p)
T(1cycle)
Ipk_s
Secondary
side
Is = Vf/Ls × Ton_s
Ipk_s = Vf/Ls × Ton_s
Iout
Pin = 2 × Lp × ( Ipk_p ) 2 × ? osc (11)
Ipk_p = Lp × Ton_p (12)
(Ton_s)
[Inductance Lp of primary side and sense resistor Rs]
If a peak current flow to transformer is represented as Ipk_p, the power (Pin) charged to the transformer on primary side
can be represented as:
1
Vac
Lp =
Vac 2 × Ton_p 2 × ? osc
2 × Pin
=
Vac 2 × Don_p 2
2 × Pin × ? osc
(13)
( Don_p =
Ton_p
T
= Ton_p × ? osc ),
To substitute the following to the formula below,
Pin
... η = Pout
(14)
∴ Lp =
Vac 2 × Ton_p 2 × ? osc × η
2 × Pout
=
Vac 2 × Don 2 × η
2 × Pout × ? osc
(15)
No.A2042-8/16
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