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STMPS2141 Datasheet(PDF) 8 Page - STMicroelectronics |
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STMPS2141 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 30 page Functional description STMPS2141, STMPS2151, STMPS2161, STMPS2171 8/30 3 Functional description 3.1 Fault blanking The STMPS devices feature a 10 ms fault blanking. Fault blanking allows current-limit faults, including momentary short-circuit faults that occur when hot-swapping a capacitive load, and also ensures that no fault is issued during power-up. When a load transient causes the device to enter current limit, an internal counter starts. If the load fault persists beyond the 10 ms fault-blanking timeout, the FAULT output asserts “low”. Load-transient faults less than 10 ms (typ.) do not cause a FAULT output assertion. Only current-limit faults are blanked. Die over-temperature faults and input voltage drops below the UVLO threshold cause an immediate fault output. 3.2 Overcurrent/over-temperature protection In overcurrent or short-circuit condition, the switch limits the current at a value of about 120% of the rated current. If the temperature of the die goes above the limit value, the switch turns off. 3.3 FAULT conditions In applications of power switch, 3 types of FAULT conditions are common. These fault conditions and the response of STMPS21x1 power switches are described in the following table. Table 3. FAULT conditions Fault Condition STMPS21x1 action Short circuit Output shorted to GND via resistance path of < 1 Ω, causing a rapid current surge Turn off output until short is removed, assert FAULT pin Over-current Output connected to a load that sinks current above threshold Reduces output voltage to reduce the current. Assert FAULT pin after a blanking period Overheating Temperature of junction exceeds 135°C due to any reason Turn OFF output until temperature falls below 125°C. Asserts FAULT pin immediately |
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