HYSTERETIC CONTROL FOR TRANSFORMER BASED POWER CONVERTERS

摘要

In described examples, a converter arrangement (300) converts an input voltage (VTN) to an output voltage (VOUT). The arrangement (300) includes: a transformer (312); at least one primary side driver switch (Q1) coupled to supply current from an input voltage terminal (VIN+) to the primary side of the transformer (312); at least one inductor (L3) coupled between the secondary side of the transformer (312) and the output voltage terminal (VOUT); at least one secondary side switch (Q3) coupled between the inductor (L3) and a ground potential; and a hysteretic controller (316) coupled to supply a first on-time signal to the at least one primary side switch (Q1) and a second on-time signal to the at least one secondary side switch (Q3). The hysteretic controller is configured to sense the output voltage and has at least one current input coupled for sensing current flowing in the inductor (L3) and generating primary side driver switch on-time pulses to control the output voltage (VOUT).