TPS92633MPWPR datasheet(23/48 Pages) TI

23 / 48 page

7.3.9.8 Over-Temperature Protection

The TPS92633 device monitors device junction temperature. When the junction temperature reaches thermal

shutdown threshold T(TSD), the output shuts down. Once the junction temperature falls below T(TSD) – T(TSD_HYS),

the device recovers to normal operation. During over-temperature protection, the FAULT pin is pulled low.

7.3.10 FAULT Bus Output With One-Fails–All-Fail

During normal operation, The FAULT pin of TPS92633 is weakly pulled up by an internal pullup current source,

I(FAULT_pullup). If any fault scenario occurs, the FAULT pin is strongly pulled low by the internal pulldown current

sink, I(FAULT_pulldown) to report out the fault alarm.

Meanwhile, the TPS92633 also monitors the FAULT pin voltage internally. If the FAULT pin of the TPS92633 is

pulled low by external current sink below VIL(FAULT), the current output is turned off even though there is no fault

detected on owned outputs. The device does not resume to normal operation until the FAULT pin voltage rises

above VIH(FAULT).

Based on this feature, the TPS92633 device is able to construct a FAULT bus by tying FAULT pins from multiple

TPS92633 devices to achieve one-fails-all-fail function as Figure 7-12 showing. The lower side TPS92633 (B)

detects any kind of LED fault and pulls low the FAULT pin. The low voltage on FAULT pin is detected by upper

side TPS926133-Q1 (A) because the FAULT pins are connected of two devices. The upper side TPS92633 (A)

turns off all output current for each channel as a result. If the FAULT pins of each TPS92633 are all connected to

drive the base of an external PNP transistor as illustrated in Figure 7-13, the one-fails–all-fail function is disabled

and only the faulty channel is turned off.

VCC

Logic

FAULT

VCC

Logic

FAULT

20 kŸ

VSUPPLY

TPS92633

Figure 7-12. FAULT Bus for One-Fails-All-Fail

Application

VCC

Log ic

FAULT

VCC

Log ic

FAULT

VSUPP LY

TPS92 633

10 kŸ

20 kŸ

Figure 7-13. FAULT Bus for One-Fails-Others-On

Application

www.ti.com

TPS92633

SLVSFE8 – JUNE 2021

Submit Document Feedback

Product Folder Links: TPS92633

TPS92633MPWPR Datasheet(PDF) 23 Page - Texas Instruments

TPS92633MPWPR Datasheet(HTML) 23 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Datasheet Download

Link URL