ZHCSBB4B July 2013 – June 2017 TPS61197
PRODUCTION DATA.
The TPS61197 monitors the inductor current through the voltage across a sense resistor (R5 in Figure 18) in order to provide current-limit protection. During the switch FET on period, when the voltage at the ISNS pin rises above the overcurrent protection threshold (VPWM_OCP or VPFM_OCP in Electrical Characteristics), the device turns off the FET immediately and does not turn it back on until the next switching cycle. The switch current limit is equal to VPWM_OCP / R5 (or VPFM_OCP / R5). The current limit is different for PWM mode and PFM mode. In the PWM mode, the current limit threshold voltage is 400 mV typically. In the PFM mode, it is 180 mV typically.