JAJSGZ0A March 2019 – September 2019 LM76202-Q1
PRODUCTION DATA.
デバイスごとのパッケージ図は、PDF版データシートをご参照ください。
When the active current limiting mode is selected, during overload events, the device continuously regulates the load current to the overcurrent limit I(OL) programmed by the R(ILIM) resistor as shown in Equation 4.
where
During an overload condition, the internal current-limit amplifier regulates the output current to I(LIM). The FLT signal assert after a delay of tPGOODF. The output voltage droops during the current regulation, resulting in increased power dissipation in the device. If the device junction temperature reaches the thermal shutdown threshold (T(TSD)), the internal FET is turn off. The device configured in latch-off mode stays latched off until it is reset by either of the following conditions:
When the device is configured in auto-retry mode, it commences an auto-retry cycle tCBretry(dly) ms after TJ < [T(TSD) – 10°C]. The FLT signal remains asserted until the fault condition is removed and the device resumes normal operation. Figure 31 and Figure 32 illustrates the behavior of the system during current limiting with auto-retry functionality.
Load transition from 22 Ω to 12 Ω | MODE pin connected to RTN | |
RILIM = 8 kΩ |
RILIM = 5.36 kΩ | ||