P ulsed loads Part 3 Presented by Sanjay Pithadia SEM Industrial Systems Medical Sector Challenge to Solve Scaling Voltage and Current using standard voltage regulators and MOSFETs 2 Voltage Scaling to support Higher Input Voltage ID: 724373
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Slide1
Designing High-Voltage, Programmable Power Supply for driving High-current Pulsed loadsPart - 3
Presented by: Sanjay Pithadia
SEM – Industrial Systems, Medical SectorSlide2
Challenge to SolveScaling Voltage and Current using standard voltage regulators and MOSFETs
2Slide3
Voltage Scaling – to support Higher Input Voltage
The regulator’s operating input voltage range decides VIN and VG values
Truly scalable
Can be increased by adding more BJTs
VIN = Input Voltage
VG = Virtual Ground Voltage
To Input of Voltage Regulator
3Slide4
High Output Current Regulators
Linear and Switching Voltage Regulator
Fundamental (App Note)
http://
www.ti.com/lit/an/snva558/snva558.pdf
Limited by Die size, package and thermal transfer
4Slide5
High-Current Low-Noise Parallel LDO Reference
Design
http://
www.ti.com/tool/TIDA-01232
Safe Operating Curve
Size and Cost
Current Scaling – Parallel Regulators
5Slide6
Current Scaling – Paralleling MOSFETs (Positive Regulator)
Current Sensing
Low-impedance MOSFET Driver
6
Slide7
Current Sensing
Low-impedance MOSFET Driver
Current Scaling – Paralleling MOSFETs (Negative Regulator)
7
Slide8
Ballast Resistors – to take care of V
GS
effects
All drains are connected together
All sources are connected together
MOSFET V
GS
Drop across 0.47
Ω
Total V
GS
required to turn-on MOSFET
8
V
GS
= 3V
V
GS
= 4VSlide9
Selecting MOSFET for Scaling Current
CSD19533KCS
9Slide10
TIDA-01371 is available on TI.com10
Visit
www.ti.com/tool/TIDA-01371
to find design resources (Gerbers, Schematics and more).Slide11
TI Information – Selective Disclosure