SBOS872A May 2018 – June 2018 OPA521
PRODUCTION DATA.
The IFLAG and TFLAG pins are active-high, open-drain outputs that indicate if the OPA521 is in current or thermal limit. Connect these pins to 3.3 V through pullup resistors (for example 10 kΩ).
The maximum output current from the power amplifier is programmed with the external ILIM resistor that is connected between ILIM (pin 12) and ground. IFLAG is set if the amplifier goes to a current limit state if a fault condition occurs. This causes the power amplifier to source or sink more current than the programmed limit value. IFLAG exhibits transient pulses under typical operation. An IFLAG true state for greater than 100 ms is a definite indication of a fault current condition.
The device contains internal thermal shutdown protection circuitry that automatically disables the output stage if the junction temperature exceeds 140°C. The device thermal shutdown protection circuitry lets the amplifier typical normal operation only when the junction temperature falls below 130°C. The TFLAG is active when the device is in thermal shut down mode.