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MC34262 数据表(PDF) 10 Page - ON Semiconductor

部件名 MC34262
功能描述  Power Factor Controllers
Download  19 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

MC34262 数据表(HTML) 10 Page - ON Semiconductor

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MC34262, MC33262
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10
Table 1. Design Equations
Notes
Calculation
Formula
Calculate the maximum required output power.
Required Converter Output Power
PO = VO IO
Calculated at the minimum required ac line voltage
for output regulation. Let the efficiency h = 0.92 for
low line operation.
Peak Inductor Current
IL(pk) =
22 PO
hVac(LL)
Let the switching cycle t = 40 ms for universal input
(85 to 265 Vac) operation and 20 ms for fixed input
(92 to 138 Vac, or 184 to 276 Vac) operation.
Inductance
LP =
t
2
2 VO PO
VO
− Vac(LL) h Vac(LL)2
In theory the on−time ton is constant. In practice ton
tends to increase at the ac line zero crossings due
to the charge on capacitor C5. Let Vac = Vac(LL) for initial
ton and toff calculations.
Switch On−Time
h Vac2
ton =
2 PO LP
The off−time toff is greatest at the peak of the ac line
voltage and approaches zero at the ac line zero
crossings. Theta (q) represents the angle of the ac
line voltage.
Switch Off−Time
VO
− 1
toff =
2 Vac ⎪Sin q⎜
ton
The minimum switching frequency occurs at the peak
of the ac line voltage. As the ac line voltage traverses
from peak to zero, toff approaches zero producing an
increase in switching frequency.
Switching Frequency
f =
ton + toff
1
Set the current sense threshold VCS to 1.0 V for
universal input (85 Vac to 265 Vac) operation and
to 0.5 V for fixed input (92 Vac to 138 Vac, or
184 Vac to 276 Vac) operation. Note that VCS must
be <1.4 V.
Peak Switch Current
R7 =
IL(pk)
VCS
Set the multiplier input voltage VM to 3.0 V at high
line. Empirically adjust VM for the lowest distortion
over the ac line voltage range while guaranteeing
startup at minimum line.
Multiplier Input Voltage
+ 1
Vac
VM =
R5
2
R3
The IIB R1 error term can be minimized with a divider
current in excess of 50 mA.
Converter Output Voltage
− IIB R2
VO = Vref
R2
+ 1
R1
The calculated peak−to−peak ripple must be less than
16% of the average dc output voltage to prevent false
tripping of the Overvoltage Comparator. Refer to the
Overvoltage Comparator text. ESR is the equivalent
series resistance of C3.
Converter Output
Peak to Peak
Ripple Voltage
2
2pfac C3
+ ESR2
DVO(pp) = IO
1
The bandwidth is typically set to 20 Hz. When operating
at high ac line, the value of C1 may need to be
increased. (See Figure 26)
Error Amplifier Bandwidth
BW =
gm
2 p C1
The following converter characteristics must be chosen:
VO − Desired output voltage
IO − Desired output current
DVO − Converter output peak−to−peak ripple voltage
Vac − AC RMS line voltage
Vac (LL) − AC RMS low line voltage


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