VDDIO/EN

OUT# pin

Other LEDs

FAULT

t = 2...20 µs

OUTT# pin

Shorted LED

HIGH_COMP level

LOW_COMP level

MID_COMP level

VDDIO/EN

OUT# pin

Other LEDs

FAULT

t = 2...20 µs

OUT# pin

Open LED

LOW_COMP level

TPS61193

SNVSAF4 – OCTOBER 2015

www.ti.com

Figure 14. LED Open Fault

Figure 15. LED Short Fault

7.4 Device Functional Modes

7.4.1 Device States

powers up. After start LED outputs are sensed to detect grounded outputs. Grounded outputs are disabled and

excluded from the adaptive voltage control loop of the DC-DC.

If a fault condition is detected, device enters FAULT_RECOVERY state. Faults that cause the device to enter

FAULT_RECOVERY are listed in Table 3. When LED open or short is detected, faulty string is disabled but

device stays in ACTIVE mode.

18

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