LX1563IDM datasheet(21/25 Pages) MICROSEMI

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SECOND-GENERATION POWER FACTOR C ONTROLLER

LX1562/1563

PRODUCT DA T ABOOK 1996/1997

Rev. 1.3

12/96

P RODUCTION

D ATA

S HEET

APPLICATION INFORMA TION

POWER MOSFET SELECTION

The voltage rating of MOSFET and rectifier must be higher than

the maximum value of the output voltage.

DS ≥ 1.2 VO MAX

DS ≥ 282V

The RMS current can be approximated by multiplying the RMS

current at the peak of the line by 0.7.

RMS = 0.7 ILP √D/3

≡ On-time duty cycle

D = 0.39 at V

AC = 100V

LP = 2.4A

RMS = (0.7)(2.4)( √.39/3) = 0.61A

DS ≤

DC ≡ allowable power

RMS/triangle = ILP √D/3

dissipation.

DS ≤

= 1.6

Ω

IRF730 with R

DS = 1Ω

Ω

Ω and V

DS = 400V meets the above

requirements.

RMS

0.61

INPUT RECTIFIER AND CAPACITOR SELECTION

The current through each diode is a half-wave rectified sine wave.

The maximum current happens at minimum line with a peak

value of 1.2A.

AVE =

= 0.38A

choose 1N4004 with 1A rating.

DISS = (IAVE) (VF) = 0.38 x 0.9 = 0.344W

J = TA + PD x θJA

assuming

JA = 65°C/W for 1/8"

lead length.

J = 80 + (.344)(65) = 102°C

PEAK

1.2

Assuming

ϕ is the percentage of allowable input current ripple,

C1 can be calculated using the following equations:

EFF =

≥

≡ Switching frequency

of inductor current

at peak input voltage.

ϕ = 3%

EFF =

= 117

Ω

≥

= 0.9µF

choose 1µF, 250V capacitor.

2 P

η I

ϕ 2π R

EFF fSW

2 x 80

(.95)(1.2)2

(.03)(2

π)(117)(50000)

OUTPUT CAPACITOR SELECTION

There are mainly two criteria for selecting the output capacitor:

A large enough capacitance to maintain a low ripple voltage, and

a low ESR value in order to prevent high power dissipation due

to RMS currents.

The output capacitance can be approximated from the following

equation:

≥

where: I

≡ DC output current

≡ Output ripple

DC =

= 0.348A

assuming 5% peak to peak ripple,

≥

= 81µF

choose C6 = 100µF.

π f

LINE ∆V

230

0.348

π (60) (11.5)

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