The TPS92200 device uses peak-current-mode control and full internal compensation to provide high transient response performance over a wide range of operating conditions. The switching frequency is internally set to 1 MHz when the minimum off time t_{MIN_OFF} is not triggered, thus minimizing the external inductor and capacitor size.

During each switching cycle, when the high-side power switch is turned on, the load current is sensed through the external sense resistor, R_SENSE. The sensed voltage on the FB pin is compared with the internal voltage reference, V_REF, through the error amplifier. The output of the error amplifier, V_COMP, is compared with the real-time current, I_{HS_SENSE}, going through the high-side power switch. Slope compensation circuitry is implemented in the device to prevent sub-harmonic oscillations as the duty cycle increases in peak-current-control mode. When the peak value of V_{HS_SENSE} reaches V_COMP in the PWM comparator, the high-side power switch is turned off and the low-side NMOS is turned on at the same time. The low-side power switch stays turned on until the end of the PWM cycle. Thus, by regulating the real-time peak current in each switching cycle, the device controls the load current at the target value.

Figure 7-1 Error Amplifier and PWM Comparator