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Article: Transistors tame perfidious leakage inductance.
- Article from:
- EDN
- Article date:
- September 27, 2001
- Author:
CopyrightCOPYRIGHT 2001 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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IN FLYBACK CONVERTERS that use primary regulation, the loose coupling between the power secondary and the primary auxiliary windings often results in poor cross-regulation. This situation arises mainly from the leakage inductance but also comes from the level of the primary clamp voltage. Figure 1 shows a typical application schematic using On Semiconductor's (www.onsemi.com) NCP1200 in an auxiliary-winding configuration. This IC uses a DSS (dynamic self-supply), but in some low-standby-power applications, it is desirable to permanent T disconnect this feature through an auxiliary level. The DSS simply acts as a standard start-up current source until the auxiliary level ...
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