Presentation	2002/2/14 Development of Bottom skip type quasi-resonant power ICs for SMPS Kengo KOIKE, Mitsuo UEKI, Nanjou AOIKE,
PDF Download Page	PDF download Page Link
Abstract(in Japanese)	(See Japanese page)
Abstract(in English)	SMPS with quasi-resonant switching mode has features of high power conversion efficiency and very low radio noise. Conversion efficiency of it's SMPS is reduced in proportion as to reducing of output power, because of increment of switching frequency. To improve conversion efficiency on light load, bottom skip quasi-resonant switching power IC is developed. This IC operates normal quasi-resonant switching mode on around of rated maximum output power. On light load less than about 60% of maximum rating, the IC automatically operates bottom skip quasi-resonance mode that means power MOSFET is just switched on at the only 2^ timing of the lowest voltage of V_DS after skipping over the 1^ switching on. To get stable switching mode transition between normal quasi-resonance and bottom skip quasi-resonance, this IC has hysteresis characteristics by changing reference time of switching off. Conversion efficiency of SMPS with the IC is improved by more than 3% compared with existing one on light load less than about 60% of maximum rating. The IC consists of power MOSFET chip and control IC chip. This IC has also pulse ratio switching mode and burst switching mode for obtaining very small standby electric power.
Keyword(in Japanese)	(See Japanese page)
Keyword(in English)	SMPS / Quasi-resonance / Bottom skip (Valley skip) / Multi chip power IC
Paper #	EE2001-46
Date of Issue

Conference Information
Committee	EE
Conference Date	2002/2/14(1days)
Place (in Japanese)	(See Japanese page)
Place (in English)
Topics (in Japanese)	(See Japanese page)
Topics (in English)
Chair
Vice Chair
Secretary
Assistant

Paper Information
Registration To	Energy Engineering in Electronics and Communications (EE)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Development of Bottom skip type quasi-resonant power ICs for SMPS
Sub Title (in English)
Keyword(1)	SMPS
Keyword(2)	Quasi-resonance
Keyword(3)	Bottom skip (Valley skip)
Keyword(4)	Multi chip power IC
1st Author's Name	Kengo KOIKE
1st Author's Affiliation	Sanken Electric Co.,Ltd.()
2nd Author's Name	Mitsuo UEKI
2nd Author's Affiliation	Sanken Electric Co.,Ltd.
3rd Author's Name	Nanjou AOIKE
3rd Author's Affiliation	Sanken Electric Co.,Ltd.
Date	2002/2/14
Paper #	EE2001-46
Volume (vol)	vol.101
Number (no)	650
Page	pp.pp.-
#Pages	7
Date of Issue