JAJSOU3A March 2024 – September 2024 TPS1213-Q1
PRODUCTION DATA
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The TPS12130-Q1 feature adjustable short circuit protection. The threshold and response time can be adjusted using RISCP resistor and CTMR capacitor respectively. The device senses the voltage across CS+ and CS– pins. These pins can be connected across the FET drain and source terminals for FET RDSON sensing or across an external current sense resistor (RSNS) as shown in Figure 7-7 and Figure 7-8 respectively.
Set the hard short-circuit detection threshold using an external RISCP resistor across ISCP/LWU and GND pins. Use Equation 8 to calculate the required RISCP value:
Where,
RSNS is the current sense resistor value or the FET RDSON value.
ISC is the desired short circuit current level.
The hard short circuit protection response is fastest < 10μs with no CTMR cap connected across TMR and GND pins.
With device powered ON and EN/UVLO, INP pulled high, during Q1 turn ON, first VGS of main FET is sensed by monitoring the voltage across G1PD to SRC. Once G1PD to SRC voltage raises above V(G1_GOOD) threshold which ensures that the external FET is enhanced, then the SCP comparator output is monitored. If the sensed voltage across CS+ and CS– exceeds the short-circuit set point (VSCP/LWU), G1PD pulls low to SRC and FLT asserts low within 10μs (with TMR pin open). Subsequent events can be set either to be auto-retry or latch off as described in following sections.