SLVSDZ5A February 2018 – January 2020 TPS2HB50-Q1
PRODUCTION DATA.
When the device receives a rising edge on the ENx pulse the output will turn on as shown in . After the turn-on delay time, the device VOUT goes to the VBB supply and begins outputting the steady state resistive current.
When the device turns off on a falling edge of ENx, the channel IOUT will go to zero and the VOUT will drop to zero as well as shown in Figure 48.
While enabled, it is important to measure the output current through both channels. Figure 49 shows this behavior when toggling the SELx pins. The image shows that when SEL2 toggles high to low, the SNS pin toggles between representing IOUT1 and IOUT2. When SEL2 is low SNS represents IOUT1 and when SEL2 is high SNS represents IOUT2. This image shows that channel 2 is currently outputting twice the output current as channel 1.
If the output of the TPS2HB50-Q1 is short-circuited, the device will protect the system from failure. shows the device turning off the output at a set current limit when the output is short circuited. (Note: Figure 51shows a case with a higher RILIM than calculated in this example, so the current limit is higher than 18 A).