The TPS92315 flyback power supply controller provides isolated output current regulation
without the use of an optical coupler. The devices process operating information from the primary
power switch and an auxiliary flyback winding to provide precise output current control. Low
start-up current, dynamically controlled operating states and a tailored modulation profile support
very low stand-by power without sacrificing start-up time or output transient response.
Control algorithms in the TPS92315 allow operating efficiencies to meet or exceed
applicable standards. The drive output interfaces to a FET power switch. Discontinuous Conduction
Mode (DCM) with valley switching is used to reduce switching losses. A combination of switching
frequency and peak primary current amplitude modulation is used to keep conversion efficiency high
across the full load and input voltage range.
The controller has a maximum switching frequency of 130 kHz and always maintains control
of the peak primary current in the transformer. Protection features help keep secondary and primary
component stress levels in check across the operation range.
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