STR-S5707 ANDSTR-S5708OFF-LINE SWITCHING REGULATORS– WITH BIPOLAR SWITCHING TRANSISTORThe STR-S5707 and STR-S5708 are specifically designed to meetthe requirement for increased integration and reliability in off-line quasiresonantflyback converters with indirect feedback. Each deviceincorporates the primary control and proportional drive circuit with athird-generation high-voltage bipolar switching transistor.Crucial system parameters such as maximum ON time and OFFtime are fixed

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