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TDA9116 Datasheet(PDF) 37 Page - STMicroelectronics |
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TDA9116 Datasheet(HTML) 37 Page - STMicroelectronics |
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37 / 47 page  TDA9116 37/47 10.8 - MISCELLANEOUS 10.8.1 - Safety functions The safety functions comprise supply voltage monitoring with appropriate actions, soft start and soft stop features on H-drive and B-drive signals on HOut and BOut outputs and X-ray protection. For supply voltage supervision, refer to paragraph Power supply and voltage references on page 26 and Figure 1. A schematic diagram putting togeth- er all safety functions and composite PLL1 lock and V-blanking indication is in Figure 15. 10.8.2 - Soft start and soft stop functions For soft start and soft stop features for H-drive and B-drive signal, refer to paragraph Soft-start and soft-stop on H-drive on page 30 and sub chapter- DC/DC CONTROLLER SECTION on page 35, re- spectively. See also the Figure 10. Regardless why the H-drive or B-drive signal are switched on or off (I2C bus command, power up or down, X-ray protection), the signals always phase-in and phase-out in the way drawn in the figure, the first to phase-in and last to phase-out being the H-drive signal, which is to better protect the power stages at abrupt changes like switch-on and off. The tim- ing of phase-in and phase-out only depends on the capacitance connected to HPosF pin which is virtually unlimited for this function. Yet it has a dual function (see paragraph PLL1 on page 27), so a compromise thereof is to be found. 10.8.3 - X-ray protection The X-ray protection is activated if the voltage lev- el on XRay input exceeds VThrXRay threshold. As a consequence, the H-drive and B-drive signals on HOut and BOut outputs are inhibited (switched off) after a 2-horizontal deflection line delay provided to avoid erratic excessive X-ray condition detec- tion at short parasitic spikes. The XRayAlarm I2C bus flag is set to 1 to inform the MCU. This protection is latched; it may be reset either by VCC drop or by I 2C bus bit XRayReset (see chap- ter I2C BUS CONTROL REGISTER MAP on page 22). |
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