TPS929160-Q1
ZHCSNG0 – APRIL 2023
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TPS929160-Q1 pulls the ERR pin down with constant current sink to report fault and set flag registers including
FLAG_OPENOUTXn, FLAG_OUT and FLAG_ERR to 1. In FAIL-SAFE state, the TPS929160-Q1 shuts down
the normal current regulation and PWM dutycycle for the error output, then the device sources a current I(RETRY)
to faulty output every t(SLS_Retry), 10 ms for retrying. I(RETRY) is programed by IRETRY register. The current
I(RETRY) can be calculated with the below equation. When the voltage difference V(SUPPLY) – V(OUTXn) of error
output rises above threshold V(OPEN_th_rising) with duration longer than t(BLANK) + t(OPEN_deg), or the supply voltage
V(SUPPLY) is above the threshold V(LOWSUPTH), the device automatically resumes the normal current and PWM
duty cycle setup and releases the ERR pin.
IRETRY ì 4 + 4
64
I(RETRY)
=
ìI(FULL _RANGE)
(8)
where
•
•
IRETRY is programmable from 0 to 15.
Use 方程式 1 to calculate I(FULL_RANGE)
.
The fault is latched in flag registers. When the open-circuit failure is removed, the master controller must write
1 to CLRFAULT to clear FLAG_OPENOUTXn, FLAG_OUT and FLAG_ERR. The CLRFAULT bit automatically
returns to 0.
7.3.8.9 LED Short-Circuit Diagnostics in FAIL-SAFE state
The TPS929160-Q1 has internal analog comparators to monitor all channel outputs with respect to a fixed
threshold for reporting OUTXn short to GND fault in FAIL-SAFE state.
The short-circuit detection is only effective during PWM-ON state with programmable minimal pulse width of
t(BLANK) + t(SHORT_deg). The t(BLANK) is programmable by register BLANK. If PWM on-time is less than t(BLANK)
t(SHORT_deg), the device cannot report any short-circuit fault.
+
When the voltage V(OUTXn) is below threshold V(SG_th_rising) with duration longer than deglitch timer length of
t(BLANK) + t(SHORT_deg), the device pulls ERR pin down with constant current sink to report fault and set flag
registers including FLAG_SHORTOUTXn, FLAG_OUT and FLAG_ERR. In FAIL-SAFE state, the TPS929160-
Q1 shuts down the normal current regulation and PWM duty cycle for the faulty output, then the device sources
a pulse current to faulty output every t(SLS_Retry), 10 ms for retrying. I(RETRY) is programed by IRETRY register.
Use 方程式 8 to calculate the current, I(RETRY). When the voltage V(OUTXn) of error output rises above threshold
V(SG_th_falling) with duration longer than t(BLANK) + t(SHORT_deg), the device automatically resumes the normal
current and PWM dutycycle setup and releases the ERR pin.
The fault is latched in flag registers. When the short-circuit failure is removed, the master controller must write
1 to CLRFAULT to clear FLAG_OPENOUTXn, FLAG_OUT and FLAG_ERR. The CLRFAULT bit automatically
returns to 0.
7.3.8.10 Single-LED Short-Circuit Detection in FAIL-SAFE state
The TPS929160-Q1 also integrates analog comparators to monitor all outputs with respect to two alternative
threshold for single-LED short-circuit diagnostic in FAIL-SAFE state. Setting the register SLSEN to 1 enables the
single-LED short-circuit detection.
The single-LED short-circuit detection is only effective during PWM-ON state with programmable minimal pulse
width of t(BLANK) + t(SLS_deg). The t(BLANK) is programmable by register BLANK. If PWM on-time is less than
t(BLANK) + t(SLS_deg), the device cannot report any single-LED short-circuit fault. When the device supply voltage
V(SUPPLY) is below the threshold V(LOWSUPTH) set by register LOWSUPTH, the single-LED short-circuit is not
detected nor reported.
When the voltage V(OUTXn) is below threshold V(SLSTHx) with duration longer than deglitch timer length of t(BLANK)
+ t(SLS_deg), and the device supply voltage V(SUPPLY) is above the threshold V(LOWSUPTH), the device pulls the
ERR pin down with constant current sink to report fault and set flag registers including FLAG_SLSOUTXn,
FLAG_OUT and FLAG_ERR. The TPS929160-Q1 provides two alternative threshold V(SLSTH0) and V(SLSTH1)
for single-LED short-circuit detection selected by SLSTHOUTXn independently for each current output. The
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Product Folder Links: TPS929160-Q1
English Data Sheet: SLVSG60
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