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TLS850F0TAV33 Datasheet(PDF) 20 Page - Infineon Technologies AG |
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TLS850F0TAV33 Datasheet(HTML) 20 Page - Infineon Technologies AG |
20 / 36 page Data Sheet 20 Rev. 1.0, 2015-12-01 TLS850F0TAV33 Block Description and Electrical Characteristics Reset Reaction Time In case the output voltage of the regulator drops below the output undervoltage lower reset threshold V RT,low, the reset output “RO/WO” is set to low, after the delay of the internal reset reaction time t rr,int. The reset blanking time t rr,blank is part of the reset reaction time trr,int. Reset Output “RO/WO” The reset output “RO/WO” is an open collector output with an integrated pull-up resistor. In case a lower-ohmic “RO/WO” signal is desired, an external pull-up resistor can be connected to the output “Q”. Since the maximum “RO/WO” sink current is limited, the minimum value of the optional external resistor “ R RO/WO,ext” is given in Table “Reset Output / Watchdog Output RO/WO” on Page 22. Reset Output “RO/WO” Low for VQ ≥ 1V In case of an undervoltage reset condition reset output “RO/WO” is held “low” for V Q ≥ 1 V, even if the input voltage V I is 0 V. This is achieved by supplying the reset circuit from the output capacitor. Reset Adjust Function The undervoltage reset switching threshold can be adjusted according to the application’s needs by connecting an external voltage divider ( R ADJ1, RADJ2) at pin “RADJ”. For selecting the default threshold connect pin “RADJ” to GND. The reset adjustment range for the TLS850F0TAV33 is given in Reset Threshold Adjustment Range. When dimensioning the voltage divider, take into consideration that there will be an additional current constantly flowing through the resistors. With a voltage divider connected, the reset switching threshold V RT,new is calculated as follows (neglecting the Reset Adjust Pin Current I RADJ): V RT,lo,new = VRADJ,th ×(RADJ,1 + RADJ,2)/ RADJ,2 (1) with • V RT,lo,new: Desired undervoltage reset switching threshold. • R ADJ,1, RADJ,2: Resistors of the external voltage divider, see Figure 6. • V RADJ,th: Reset adjust switching threshold given in Reset Adjustment Switching Threshold. |
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