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LM36011YKBR Fiches technique(PDF) 11 Page - Texas Instruments |
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LM36011YKBR Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 26 page IVFM ENABLE LEVEL STROBE VIN PROFILE for Stop and Hold Mode O/P Current Profile in Stop and Hold Mode Dotted line shows O/P Current Profile with IVFM Disabled Set Target Flash Current IVFM-D SET RAMP FROM THE RAMP REGISTER USED 11 LM36011 www.ti.com SNVSAN5 – JULY 2017 Product Folder Links: LM36011 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 7.4 Device Functioning Modes 7.4.1 Start-Up (Enabling The Device) At turnon the LED current source steps through each FLASH or TORCH level until the target LED current is reached. This gives the device a controlled turnon and limits inrush current from the VIN supply. The target LED flash and the target LED torch currents are set by the LED Flash Brightness Register (0x03 bits [6:0]) and LED Torch Brightness Register (0x04 bits [6:0]) respectively. 7.4.2 Input Voltage Flash Monitor (IVFM) The LM36011 has the ability to adjust the flash current based upon the voltage level present at the IN pin utilizing the input voltage flash monitor (IVFM). The adjustable threshold IVFM-D ranges from 2.9 V to 3.6 V in 100-mV steps and is set by Configuration Register (0x02) bits [7:5]. Additionally, the IVFM-D threshold sets the input voltage boundary that forces the LM36011 to stop ramping the flash current during start-up. Figure 19. IVFM Mode 7.4.3 Fault/Protections Upon a fault condition, the LM36011 sets the appropriate flag(s) in the Flags Register (0x05) and switches into stand-by mode obtained by clearing the mode M1, M0 (bits [1:0]) of the Enable Register (0x01). The LM36011 remains in standby until an I2C read of the Flags Register. I2C read of the Flags Register clears the flags and the fault status can be re-checked. If the fault(s) is still present, the LM36011 re-sets the appropriate flag bits and enters stand-by again. 7.4.3.1 Input Voltage Flash Monitor (IVFM) When the input voltage crosses the IVFM-D value, programmed by Configuration Register (0x02) bits [7:5], the LM36011 sets the IVFM flag (bit [6]) of Flags Register (0x05). 7.4.3.2 LED Short Fault LM36011 enters stand-by mode from flash or torch mode and VLED Short Fault flag (bit [5]) of Flags Register (0x05) is set, if the LED output experiences a short condition. An LED short condition occurs if the voltage at the LED pin goes below 500 mV (typical). There is a deglitch time of 256 µs before the LED short flag is valid The LED short fault can be reset to 0 by removing power to the LM36011, or setting the software reset field (Register 0x06 bit [7]) to a 1, or by reading back the Flags Register. |
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