ZHCSA47E July 2012 – January 2018 TPS23751 , TPS23752
PRODUCTION DATA.
The TPS23751 and TPS23752 DC-DC controller implements typical current-mode control as well as variable frequency operation for light load efficiency optimization as shown in the Functional Block Diagram. Features include programmable oscillator, over-current, PWM, VFO, and ZDC comparators, current-sense blanker, softstart, and gate driver. In addition, an internal slope-compensation ramp generator, thermal shutdown, and startup current source with control are provided.
The TPS23751 and TPS23752 are targeted at high efficiency, current mode, synchronous, flyback converters incorporating an external error amplifier. In PWM mode, the external error amplifier and optocoupler drives the CTL pin to demand current from the PWM. The internal current sense to control (CS to CTL pin) gain is 5 V/V. VFO mode can be enabled using a voltage divider on the SRT pin. The TPS23751 and TPS23752 enter VFO mode when VCTL falls below VSRT/2 + 1.75 V.