AN3290 datasheet(29/34 Pages) STMICROELECTRONICS

Part #	AN3290

Description	Reference design for double output SMPS for power line

PDF	34 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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29 / 34 page

AN3290

Modifications for ultra wide-range operations

Doc ID 18038 Rev 1

29/34

Modifications for ultra wide-range operations

Although the board has been developed in wide-range up to 264 VAC, it can be easily

modified in order to sustain ultra wide-range operation, up to 440 VAC, with minimum parts

modification, thanks to the 900 V rated power section BVDss of the ALTAIR04-900.

In Figure 33 the modified schematic is shown; the modifications mainly involve the input

stage, which must be designed in order to meet the 440 VAC operations. Also the diodes D3,

D4, and D5 must be replaced in order to sustain the higher peak reverse voltage. No

modifications are needed for the transformer and the IC.

The modified components are listed in the bill of material in Table 4; for other parts not

specified in this table, the bill of material in Table 2 is still valid.

Figure 33.

Electrical schematic for 440 VAC input voltage option

AN3290 Datasheet(PDF) 29 Page - STMicroelectronics