Power resistors minimise dissipation and noise for current sensing
Vishay has introduced the WSL and
WSR series current-sense resistors using
proprietary processing techniques to
achieve extremely low resistance values
down to 0.001Ω and low thermal EMF
of less than 3µV/°C.
These advantages help maximise energy
conversion efficiency, minimise power
consumption, and minimise sensing errors.
The resistors introduce very low inductance of
0.5nH to 5nH while delivering accurate
frequency response to 50MHz.
Both the WSL and WSR families feature
robust construction and have a Temperature
Coefficient of Resistance (TCR) below
200ppm/°C to minimise resistance changes
due to self-heating or fluctuations in ambient
temperature. Tolerances of ±0.5% and ±1%
are available to maximise current-sensing
performance.
The WSL series operates over the
temperature range -65°C to 170°C, while the
WSR series will operate from -65°C up to 275°C
to withstand high-temperature conditions with
minimal de-rating of rated power. Both families
are available in standard surface-mount
packages, delivering high power density for
circuit-board size reductions, leading to
reduced footprint, material costs and assembly
complexity.
FEATURES
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- All-welded construction
- ±0.5% and ±1% tolerances available
- Solid-metal resistive elements
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APPLICATIONS
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- Switched-mode and linear power supplies
- Motor controls
- Instruments
- Power amplifiers
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The WSL and WSR series perform accurate sensing with
minimal impact on surrounding circuitry.
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