STR-A6100 データシートの表示（PDF） - Sanken Electric co.,ltd.
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STR-A6100 Datasheet PDF : 26 Pages
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STR-A6100 Series
Phase Compensation
A typical phase compensation circuit with a
secondary shunt regulator (U51) is shown in Figure
10-3.
C52 and R53 are for phase compensation. The value
of C52 and R53 are recommended to be around 0.047
μF to 0.47 μF and 4.7 kΩ to 470 kΩ, respectively.
They should be selected based on actual operation in
the application.
L51
T1 D51
C51
S
R54
PC1 R51
R55
R52
C52 R53
U51
R56
VOUT
(+)
C53
(-)
Figure 10-3 Peripheral circuit around secondary shunt
regulator (U51)
Transformer
Apply proper design margin to core temperature rise
by core loss and copper loss.
Because the switching currents contain high
frequency currents, the skin effect may become a
consideration.
Choose a suitable wire gauge in consideration of the
RMS current and a current density of 4 to 6 A/mm2.
If measures to further reduce temperature are still
necessary, the following should be considered to
increase the total surface area of the wiring:
▫ Increase the number of wires in parallel.
▫ Use litz wires.
▫ Thicken the wire gauge.
In the following cases, the surge of VCC pin
voltage becomes high.
▫ The surge voltage of primary main winding, P, is
high (low output voltage and high output current
power supply designs)
▫ The winding structure of auxiliary winding, D, is
susceptible to the noise of winding P.
When the surge voltage of winding D is high, the
VCC pin voltage increases and the Overvoltage
Protection function (OVP) may be activated. In
transformer design, the following should be
considered;
▫ The coupling of the winding P and the secondary
output winding S should be maximized to reduce the
leakage inductance.
▫ The coupling of the winding D and the winding S
should be maximized.
▫ The coupling of the winding D and the winding P
should be minimized.
In the case of multi-output power supply, the
coupling of the secondary-side stabilized output
winding, S1, and the others (S2, S3…) should be
maximized to improve the line-regulation of those
outputs.
Figure 10-4 shows the winding structural examples
of two outputs.
Winding structural example (a):
S1 is sandwiched between P1 and P2 to
maximize the coupling of them for surge
reduction of P1 and P2.
D is placed far from P1 and P2 to minimize the
coupling to the primary for the surge reduction of
D.
Winding structural example (b)
P1 and P2 are placed close to S1 to maximize the
coupling of S1 for surge reduction of P1 and P2.
D and S2 are sandwiched by S1 to maximize the
coupling of D and S1, and that of S1 and S2.
This structure reduces the surge of D, and
improves the line-regulation of outputs.
Margin tape
P1 S1 P2 S2 D
Margin tape
Winding structural example (a)
Margin tape
P1 S1 D S2 S1 P2
Margin tape
Winding structural example (b)
Figure 10-4 Winding structural examples
STR-A6100 - DS Rev.2.1
SANKEN ELECTRIC CO.,LTD.
19
Jun. 05, 2014
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