AN4339 datasheet(9/27 Pages) STMICROELECTRONICS

部件名	AN4339

功能描述	BLDC motor based ceiling fan solution proposal

PDF	27 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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9 / 27 page

DocID025039 Rev 1

9/27

AN4339

Description

1.3.4

Calculations

Min. AC input, Vacmin = 90 VAC

Max. AC input, Vacmax = 265 VAC

Output DC voltage, VOUT = 24 VDC

Load current, IOUT = 1 A

Overall efficiency,



= 0.87

Output voltage 2fL ripple = 2 Vpk-pk

Reflected voltage, VOR = 170 V

Minimum switching frequency, fswmin = 40 KHz

Min. DC voltage:

Equation 1

Vpkmin =

2.Vacmin - Vdson

Vpkmin = 123 V (taking Vdson = 4 V)

Max. DC voltage:

Equation 2

Vpkmax =

2.Vacmax - Vdson

Vpkmax = 370 V

Input power:

Equation 3

PIN = POUT/ 

PIN = 27.6 W

Peak to reflected voltage:

Equation 4

Kv = Vpkmin/VR

Kv = 0.723

Flyback characteristic functions are:

Equation 5

F1(Kv) = 0.42

Equation 6

F2(Kv) = 0.315

F1 Kv



0.637 4.6 10

–



1 0.729 Kv



------------------------------------------------------------

F2 Kv



0.5 1.4 10

–



1 0.815 Kv



------------------------------------------------------

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