Voltage margin
Review the maximum drain-source voltage, including switching overshoot and input transients, against the VDS rating.
DC POWER CONVERSION
DC/DC conversion
Review switching devices, rectification and optional linear post-regulation against the input range, load and thermal requirements of a DC power design.
Explore component selectionFUNCTIONAL OVERVIEW
- 01followed by
DC input
Operating range & transients
- 02followed by
Switching stage
MOSFET, gate drive & topology
- 03
Regulated output
Load range & thermal evaluation
Functional overview of a converter. Inductors, capacitors, control and protection circuits are omitted.
APPLICATION OVERVIEW
Understand the circuit requirements.
DC/DC conversion adapts one DC voltage to another. The topology, input range, load current and control scheme determine how the switching devices are used.
A part number's voltage and current ratings are only the start. Gate drive, on-resistance conditions, switching characteristics and board-level thermal behavior all belong in the selection brief.
DESIGN CONSIDERATIONS
The details behind component selection.
Gate-drive conditions
Use RDS(on) values measured at a gate voltage relevant to the design. Gate threshold voltage describes the onset of conduction, not the fully enhanced on-state.
Conduction & switching
Consider conduction losses alongside gate charge and switching behavior. Compare values only with their measurement conditions in view.
Package & thermal path
Review pinout, footprint, mounting conditions and the available heat path. Datasheet current ratings do not automatically describe the current a finished PCB can sustain.
COMPONENT SELECTION
A starting point for your design.
Compare low- and medium-voltage MOSFETs against the actual switch voltage and gate drive. Schottky rectifiers may be relevant to an asynchronous stage; an LDO may be evaluated separately for a lower-noise auxiliary or post-regulated rail. These are different circuit functions, and the linked devices are starting points for datasheet review.
PDFN5*6
NTS036N03P530 V N-channel enhancement-mode trench MOSFET in a PDFN5*6 package, with a 112 A drain-current rating under the datasheet conditions. On-resistance values below retain their gate-drive and test-current conditions.
30 VView product
TO-220C
NTH084N06C60 V N-channel enhancement-mode trench MOSFET in a TO-220C package, with a 73 A drain-current rating under the datasheet conditions. On-resistance values below retain their gate-drive and test-current conditions.
60 VView product
TO-263
NTS096N08D80 V N-channel enhancement-mode trench MOSFET in a TO-263 package, with a 96 A drain-current rating under the datasheet conditions. On-resistance values below retain their gate-drive and test-current conditions.
80 VView product
CONTINUE EXPLORING
Related application topics.
FUNCTIONAL OVERVIEW
- 01followed by
AC input
- 02followed by
Input bridge
- 03
Converter & output
POWER CONVERSION
AC/DC power supplies
Start at the input bridge, then examine the rectification and switching requirements of the converter and its output stage.
Explore applicationFUNCTIONAL OVERVIEW
- 01followed by
AC input
- 02followed by
Bridge rectifier
- 03
Driver & LED load
DRIVER & POWER SUPPLY DESIGN
LED lighting
Explore input rectification and component requirements for LED driver power supplies, with attention to package size and operating temperature.
Explore application