MC34262DR2 datasheet(10/19 Pages) ONSEMI

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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

pfac 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 25)

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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nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
ON Semiconductor	MC34262DR2G	399Kb / 19P	Power Factor Controllers August, 2013 ??Rev. 14

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