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LED171596ARSLR Datasheet(PDF) 20 Page - Texas Instruments |
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LED171596ARSLR Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 153 page  Copyright © 2016, Texas Instruments Incorporated switching LED[24] short 0 1 2 3 0 LED[48] short 1 15 0 1 2 LED[00] short PWM cycle HS phase fault counter HS cycle (100us) 15 (fault sampled) (fault sampled) (fault sampled) 0 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 0 1 2 3 detection window (1.6ms) LED[00] short flag LED[24] short flag LED[48] short flag HS ghost sw[0] disabled switching HS ghost sw[1] disabled switching HS ghost sw[2] switching HS ghost sw[3] clear_led_short 1 0 1 2 1 2 3 16 1 2 3 16 1 2 switching switching Time durations for pwm_freq_sel = 1. When pwm_freq_sel = 0, all times are half as long. 20 LED171596A SNVSAY2 – OCTOBER 2017 www.ti.com Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Figure 16. Shorted LED detection timing with automatic ghost cancellation disable 7.3.4.2 Thermal Shutdown If the die temperature of the LED171596A device reaches the thermal shutdown threshold TTSD (150°C nominal), the LED outputs are forced into shutdown to protect the device from damage. TSD INT_STATUS bit is set. If the MASK_TSD bit is zero then the interrupt pin is also pulled low. The device restarts the LED outputs when temperature drops by TTSD_THR (20°C nominal). The LED171596A device must not be started up if the ambient temperature is > 130°C. If this condition occurs, the device trips a TSD fault immediately, and the EEPROM is not loaded to prevent data corruption. The INT pin still goes low to indicate a TSD fault but the I2C and SPI interfaces are not fully operational. Once the temperature drops below the TTSD trip level, the EEPROM is loaded and the device proceeds to STANDBY state and normal operation. |
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