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LP8866S-Q1 Datasheet(PDF) 35 Page - Texas Instruments |
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LP8866S-Q1 Datasheet(HTML) 35 Page - Texas Instruments |
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35 / 82 page  No actions Open LED fault when VBOOST = MAX Short LED fault ( at least one output should be between LOW_COMP and MID COMP) Open LED Fault Short LED Fault Normal Conditions Fault Conditions OUT1~6 PIN VOLTAGE VLEDSHORT VHEADROOM+VHEADROOM_HYS VHEADROOM VSHORTGND LED Short to GND Fault Figure 7-18. LED Open and Short Detection Logic 7.3.9.3.2 Short LED Faults (SHORT_LED) Short LED fault is detected if one or more LED outputs are above the VLEDSHORT typical 5.4 V and at least one LED output is inside the normal operation window (see Figure 7-18). Shorted string is disconnected from the boost adaptive control loop and the LED PWM output is disabled. LED_STATUS status bit is set and an interrupt generated similarly as in open LED case. Detailed shorted LED fault can be read from bits SHORT_LED and LEDx_FAULT (x = 1...6), indicating the faulty LED) in LED_FAULT_STATUS register. In HUD application, when output channels are connected as groups and only one or two groups are active, one more special condition will trigger the short LED fault. This is when boost adaptive voltage comes to minimum and one of the LED channels voltage is still higher than VHEADROOM + VHEADROOM_HYS. 7.3.9.3.3 LED Short to GND Faults (GND_LED) During boost soft start and normal boost operation, if LED output is lower than VSHORTGND for 20 ms, device turns off the corresponding LED output channel and output a typical 6-mA current for 300-µs period again. After this operation, if output voltage is still lower than VHEADROOM, LED short to GND fault will be reported. If LED short to GND is reported, boost, LED outputs and power-line FET is turned off, the device will enter Fault Recovery mode. LED_STATUS bit is set and an interrupt generated similarly as in open LED case. LED short to GND fault reason can be read from bits LED_GND and LEDx_FAULT (x = 1...6) in LED_FAULT_STATUS register. These bits maintain their value until device powers are down while the LED_STATUS bit is cleared by the interrupt clearing procedure. 7.3.9.3.4 Invalid LED String Faults (INVSTRING) During device initialization, any of un-used LED outputs pins are checked whether connected to GND or not. If they are not connected to GND as expected, the LP8866S-Q1 reports invalid string fault and tries to function normally if possible. The INVSTRING_STATUS fault bit is set in the LED_FAULT_STATUS register, and the INT pin is triggered. The LEDSET resistor missing or invalid fault is not detected after initialization, so that the LP8866S-Q1 operates in the configuration determined during initialization even though the LEDSET resistor is missing or invalid after initialization. www.ti.com LP8866S-Q1 SNVSBD1A – AUGUST 2020 – REVISED FEBRUARY 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 35 Product Folder Links: LP8866S-Q1 |
Similar Part No. - LP8866S-Q1_V01 |
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Similar Description - LP8866S-Q1_V01 |
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