Patent ID: 9277612
Filing Date: 2016-03-01
CPC Classification: G02F,H02M,H05B

Claim Text:
1. A control circuit of a flyback type switching converter including: a transformer having a primary coil and a secondary coil; a switching transistor connected to the primary coil; and a detection resistor arranged on a path of a current flowing through the switching transistor in an ON period of the switching transistor, the control circuit comprising: a current detection comparator configured to compare a detection voltage corresponding to a voltage drop of the detection resistor with a reference voltage and generate a peak current detection signal asserted when the detection voltage reaches the reference voltage; a driving logic unit configured to generate a pulse signal indicating a turn-on/off operation of the switching transistor and change the pulse signal to an OFF level indicating the turn-off operation of the switching transistor when the peak current detection signal is asserted; a driver configured to drive the switching transistor based on the pulse signal; and a reference voltage setting unit configured to measure time (T