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Switch driver_presentation (1)
This document summarizes the testing of three printed circuit boards (PCBs) for a switch driver at different temperatures. The switch driver switches between 100V and -7V/-15V voltages at a frequency of 2.5 kHz. Testing was done at room temperature (25°C) and elevated temperature (70°C). Current draw and rise/fall times were measured for the different voltage paths on each PCB. Minor variations were observed between temperatures but all measurements were within specifications. Notes are provided on the function of feedback circuits and proper connection of input signals.
Switch driver_presentation (1)
- 1. Switch driver Features &performance
- 2. The function ofswitch driver •Switching on/off between two diodes in RF block •Switching is made between 100V to -7V/-15V voltage value •Switching frequency is 2.5 kHz
- 3.
- 4. Checking of driver ThreePCB’s of driver were checked under temperature of the room (25`C) and also under temperature of 70`C
- 5. PCB#1(100V,-15V);T=25`C •Resistors used via100v path •R161,163=2.2kOhm •R5,R18=300Ohm •Resistors used via -15v path •R176,R178=1kOhm •R12,R85=0.8kOhm •I (via 100v path)=370mA •I (via -15v path)=220mA •T rise=19us •T fall=19us
- 6. PCB#1 (100v,-15v) T=70`C •I(via 100v path)=360mA •I (via -15v path)=220mA •T rise=18.4us •T down=21us
- 7. PCB#2(100v,-7v) T=25`C •Resistors andcapacitors via 100v path •R163,R161=8kOhm •R78,R75=1.2kOhm •C44,C34=4.7nF •C45,C35 replaced by R=100Ohm •Resistors and capacitors via -7v path •R175,R176=10Ohm •R12,R85=1kOhm •C37,C47=20pF •C36,C46 replaced by R=2kOhm •I (via 100v path)=200mA •I (via -7v path)=100mA •T rise=24us •T fall=24us
- 8. PCB#2 (100v,-7v) T=70`C •I(via 100v path)=200mA •I (via -7v path)=100mA •T rise=24.8us •T fall= 27.2us
- 9. PCB#3(100v,-7v) T=25`C •R163,R161=8kOhm •R78,R75=1.2kOhm •C44,C34=4.7nF •C45,C35 replacedby R=100Ohm •Resistors and capacitors via -7v path •R175,R176=10Ohm •R12,R85=1kOhm •C37,C47=20pF •C36,C46 replaced by R=2kOhm •I (via 100v path)=240mA •I (via -7v path)=110mA •T rise=20.8us •T fall=22.4us •Resistors and capacitors via 100v path
- 10. PCB#3 T=70`C •I (via100v path)=250mA •I (via -7v path)=110mA •T rise=12us •T fall=24us
- 13. Attentions and notes •Thetime delay is caused during of feedback circuit that prevents spikes of high current to appear witch provides to the driver much more stability and defense •The Switch signal input should be connected to the driver just after all other inputs are connected ;that because of feature of HV supply and circuit logic