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MC33364D1R2 bảng dữ liệu(PDF) 11 Page - ON Semiconductor

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The MOC8102 has a typical current transfer ratio (CTR)
of 100% with 25% tolerance. When the TL431 is full--on,
5 mA will be drawn from the transistor within the
MOC8102. The transistor should be in saturated state at that
time, so its collector resistor must be
Rcollector =
Vref − Vsat
ILED
=
5.0 V − 0.3 V
5.0 mA
= 940 Ω
Since a resistor of 5.0 k is internally connected from the
reference voltage to the feedback pin of the MC33364, the
external resistor can have a higher value
Rext = R3 =
(Rint)(Rcollector)
(Rint) − (Rcollector)
=
(5.0 k)(940)
5.0 k − 940
= 1157 Ω ≈ 1200 Ω
This completes the design of the voltage feedback circuit.
In no load condition there is only a current flowing
through the optoisolator diode and the voltage sense divider
on the secondary side.
The load at that condition is given by:
Rnoload =
Vout
(ILED + Idiv)
=
6.0 V
(5.0 mA + 0.25 mA) =
1143 Ω
The output filter pole at no load is:
fph =
1
(2π Rnoload Cout )
=
1
(2π)(1143)(300 mF) =
0.46 Hz
In heavy load condition the ILED and Idiv is negligible. The
heavy load resistance is given by:
Rheavy =
Vout
Iout
=
6.0 V
2.0 A =
3.0 Ω
The output filter pole at heavy load of this output is
fph =
1
(2π RheavyCout)
=
1
(2π)(3)(300 mF) =
177 Hz
The gain exhibited by the open loop power supply at the
high input voltage will be:
A =
V
in max − Vout
2
Ns
(V
in max)(Verror)(Np)
=
382 V − 6.0 V
2
(7)
(382 V)(1.2 V)(139)
= 15.53 = 23.82 dB
The
maximum
recommended
bandwidth
is
approximately:
fc =
fs min
5
=
70 kHz
5
= 14 kHz
The gain needed by the error amplifier to achieve this
bandwidth is calculated at the rated load because that yields
the bandwidth condition, which is:
Gc = 20 log
fc
fph
−A=20log14kHz
177
−23.82dB
= 14.14 dB
The gain in absolute terms is:
Ac = 10(Gc∕20) = 10(14.14∕20) = 5.1
Now the compensation circuit elements can be calculated.
The output resistance of the voltage sense divider is given by
the parallel combination of resistors in the divider:
Rin = Rupper || Rlower = 10 k || 14 k = 5833 Ω
R9 = (Ac) (Rin) = 29.75 k ≈ 30 k
C8 =
1
2π (Ac)(Rin)(fc)
= 382 pF ≈ 390 pF
The compensation zero must be placed at or below the
light load filter pole:
C7 =
1
2π (R9) (fpn)
= 11.63 mF ≈ 10 mF


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