Reverse voltage
Review the voltage across each rectifier under normal operation and expected transients. Apply design margin to the relevant datasheet limit.
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 component selectionFUNCTIONAL OVERVIEW
- 01followed by
AC input
Input range & transients
- 02followed by
Input bridge
Reverse voltage & surge current
- 03
Converter & output
Topology-specific device selection
Functional overview only. Input protection, filtering, PFC, isolation and control circuitry depend on the design.
APPLICATION OVERVIEW
Understand the circuit requirements.
An AC/DC supply contains several distinct selection problems. The input bridge rectifies the AC input; the converter and output stages have their own voltage, current, switching and thermal requirements.
Begin with the input range, output power and chosen topology. Bridge rectifier ratings and output rectifier characteristics should be evaluated in their respective circuit positions.
DESIGN CONSIDERATIONS
The details behind component selection.
Current & inrush
Distinguish average rectified current from non-repetitive surge current. Check the waveform and conditions used for the IF(AV) and IFSM ratings.
Losses & temperature
Evaluate forward voltage at the operating current and temperature. Review the mounting conditions behind the thermal and current ratings.
The correct circuit position
Output rectifiers and primary-side switches require separate evaluation. A low-voltage MOSFET or Schottky rectifier is not an AC mains primary-side substitute.
COMPONENT SELECTION
A starting point for your design.
Use the bridge category to investigate input rectification, high-voltage MOSFETs for switching-stage requirements, and the rectifier categories for the relevant converter or output position. SiC and silicon diodes have different characteristics. Evaluate voltage stress, recovery, drive conditions and thermal performance for the chosen topology; the linked parts are examples for comparison.
ABS
ABS101000 V, 1 A single-phase bridge rectifier in a ABS package. Review the electrical ratings and operating conditions below, with complete details in the datasheet.
1000 VView product
GBU
GBU35161600 V, 35 A single-phase bridge rectifier in a GBU package. Review the electrical ratings and operating conditions below, with complete details in the datasheet.
1600 VView product
TO-220AB
MBR10100CT100 V dual common-cathode Schottky rectifier in a TO-220AB package. Average forward current is 10 A for the total device and 5 A per diode, under the datasheet load and thermal conditions.
100 VView product
CONTINUE EXPLORING
Related application topics.
FUNCTIONAL OVERVIEW
- 01followed by
DC input
- 02followed by
Switching stage
- 03
Regulated output
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 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