SRK1000BTR

SRK1000BTR is an adaptive synchronous rectification controller for flyback converter suitable for operation in QR and mixed CCM/DCM fixed frequency circuits. It provides a high-current gate-drive output, capable of driving N-channel Power MOSFETs. The control scheme of this IC is such that the SR MOSFET is switched on as soon as current starts flowing through its body diode and it is then switched off as current approaches zero. The fast turn-on, with minimum delay, and the innovative adaptive turn-off logic allow maximizing the conduction time of the SR MOSFET and eliminating the effect of parasitic inductance in the circuit. The device enters low consumption mode when it detects primary controller burstmode operation, or when the SR MOSFET conduction becomes lower than the programmed minimum TON. Applications includes battery chargers / quick chargers, adapters and USB power delivery (profile 3).

• Wide Vcc operating voltage range from 3.75 to 32V
• CC regulation operation down to 2V output supported
• Very low quiescent current in low consumption mode (160μA)
• High-voltage sensing input for SR MOSFET drain-source voltage (100V AMR)
• Operating frequency up to 300KHz
• High-current gate-drive output for N-MOSFET
• Fast turn-on with minimum delay time and adaptive turn-off logic
• Programmable minimum ON and fixed minimum TOFF