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HV7801 Datasheet(PDF) 3 Page - Supertex, Inc |
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HV7801 Datasheet(HTML) 3 Page - Supertex, Inc |
3 / 5 page 3 HV7801 ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com Block Diagram Application Information General The HV7801 high side current monitor IC features accurate current sensing, small size, low component count, low power consumption, exceptional input voltage range, ease of use and low cost. Typical use is measurement of line or load current for purpose of overcurrent protection, metering and current regulation. High side current sensing, as opposed to ground referenced or low side current sensing, is desirable or required when: The current to be measured does not flow in a circuit associated with ground. The measurement at ground level can lead to ambiguity due to changes in the grounding arrangement during field use. Introduction of a sense resistor in the system ground is undesirable due to issues with safety, EMI, or signal degradation due to common impedance coupling. Principle of Operation The operational amplifier and MOSFET forces the voltage across R A to track VSENSE within the limit of the offset voltage of the opamp, i.e. V RA = VSENSE. The current through R A returns to ground through RB. R A and RB are integrated, exhibiting tight matching and excellent tracking. By design, R B is five times larger than RA. Consequently, V RB is five times larger than VRA, thus resulting in a voltage gain of 5. OUT Pin Loading Effects Note that the OUT pin has an typical output resistance of 16.5kΩ. Loading the output causes the voltage gain to drop and rise/fall times to increase. For example, assuming output resistance is 16.5kΩ, the load resistance should exceed 16.5MΩ in order to limit the drop in gain to 1 part in 1000. Again assuming output resistance is 16.5kΩ, capacitive loading of 6pF results in a response pole with a time constant of 100ns, not high enough to materially affect the output rise and fall times (about 700ns). ► ► ► ISENSE VSENSE RSENSE Bias Circuits HV7801 IN LOAD GND OUT VOUT RA RB RP (Optional, see text) |
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