INTEGRATED POWER-SWITCH COMPARISON BRIEF
Yenra | Updated September 8, 2026
Article: https://yenra.com/power-switches/

PURPOSE
Compare integrated offline power switches under matching conditions with a
qualified supply designer. This is a document review, not an assembly or
energized-testing procedure. Offline circuits contain hazardous voltages.

REQUIRED SERVICE
Input range; output voltage/current/power; load profile:
Enclosure, ambient temperature and cooling:
Standby and loaded-efficiency requirements:
Isolation and applicable finished-product requirements:

DEVICE A / DEVICE B — repeat the same fields
Exact part/package and product status:
Datasheet revision/date and application guide:
Controller method and topology:
Power capability with input, enclosure and temperature footnotes:
Operating and absolute voltage limits; transient assumptions:
Current limit, tolerance and mode:
Thermal model and normal-operation margin:
Fault | trigger | delay | response | reset | external components:
Short circuit:
Overload:
Overtemperature:
Feedback loss/output overvoltage:

WHOLE-SUPPLY MEASUREMENTS
Input voltage, load, ambient and measurement method:
Input W; output W; efficiency = output/input x 100%:
Loss = input W - output W; includes all components in the boundary.
No-load input W and included auxiliary circuits:
Fictional check: 10 W output / 12 W input = 83.3%; loss = 2 W.
0.08 W standby for 20 h/day gives 0.584 kWh/year.
These invented figures describe no named device.

INTERPRETATION
Compare like operating states. A MOSFET blocking rating is distinct
from an AC input rating; standby watts are distinct from loaded efficiency.
Manufacturer power-table footnotes may distinguish enclosed continuous
operation from peak/open-frame service. Preserve those conditions.

DECISION
Comparable conditions satisfied:
Finished-supply thermal, insulation, EMC and fault tests still required:
Open issue | evidence needed | owner | due date:
Reviewer and conclusion:

REFERENCE CONTEXT
The linked article explains the comparisons and limits. Check exact project or equipment documents before using a specification.
TinySwitch-4 family datasheet, revision G, October 2020
https://www.power.com/sites/default/files/documents/tinyswitch-4_family_datasheet.pdf