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LT6700HVHS6-3-TRMPBF Datasheet(PDF) 14 Page - Linear Technology |
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LT6700HVHS6-3-TRMPBF Datasheet(HTML) 14 Page - Linear Technology |
14 / 20 page ![]() LT6700/LT6700HV 6700123fg applicaTions inForMaTion The LT6700-1/LT6700-2/LT6700-3/LT6700HV-1/ LT6700HV-2/LT6700HV-3 devices are a family of dual micropower comparators with a built-in 400mV refer- ence. Features include wide supply voltage range (1.4V to 18V), Over-The-Top input and output range, 2% accurate rising input threshold voltage and 6.5mV typical built-in hysteresis. The comparator’s open-collector outputs can sink up to 40mA typical. Internal Reference Each of the comparator sections has one input available externally, with the three versions of the part differing by the polarity of those available inputs (i.e., inverting or noninverting). The other comparator inputs are connected internallytothe400mVreference.Therisinginputthreshold voltage of the comparators is designed to be equal to that of the reference (i.e., ≈400mV). The reference voltage is established with respect to the device GND connection. Hysteresis Each comparator has built-in 6.5mV (typical) hysteresis to simplify designs, ensure stable operation in the presence of noise at the inputs, and to reject supply rail noise that might be induced by state change load transients. The hysteresis is designed such that the falling input threshold voltage is nominally 393.5mV. External positive feedback circuitry can be employed with noninverting comparator inputs to increase effective hysteresis if desired, but such circuitry will provide an apparent effect on both the rising and falling input thresholds (the actual internal thresholds remain unaffected). Comparator Inputs A comparator input can swing from ground to 18V (36V for LT6700HV), regardless of the supply voltage used. The typical input current for inputs well above threshold (i.e., >800mV)isafewpAleakingintoaninput.Withdecreasing input voltage, a small bias current begins to be drawn out of the input, reaching a few nA when at ground potential. The input may be forced 100mV below ground without causing an improper output, though some additional bias current will begin to flow from the parasitic ESD input pro- tection diode. Inputs driven further negative than 100mV below ground will not cause comparator malfunction or damage (provided the current is limited to 10mA), but the accuracy of the reference cannot be guaranteed, in which case the output state of the alternate comparator may be affected. Comparator Outputs The comparator outputs are open collector and capable of sinking 40mA typical. Load currents are directed out the GND pin of the part. The output off-state voltage may range between –0.3V and 18V (36V for LT6700HV) with respect to ground, regardless of the supply voltage used. When the output high state bias voltage is above 18V, a 100k minimum pull-up resistor is required and total load capacitor must be less than 100nF. If the output high state is above 18V, caution must be taken to prevent a short from the output directly to the bias voltage, even if the outputisintheoffstate.Aswithanyopen-collectordevice, the outputs may be tied together to implement wire-AND logic functions. Power Supplies Thecomparatorfamilycorecircuitryoperatesfromasingle 1.4V to 18V supply. A minimum 0.1µF bypass capacitor is required between the VS pin and GND. When an output load is connected to the supply rail near the part and the output is sinking more than 5mA, a 1µF bypass capaci- tor is recommended. The voltage reference built into the LT6700 can be susceptible to high noise on the supply line, particularly noise that is less than 50kHz and larger than 20mVP-P. In order to reduce the probability of a false comparator output in the presence of high supply noise, an RC filter should be used to reduce the noise. This filter can be created simply by adding a series R between the systemsupplyandtheLT6700VSpin,usingthedecoupling capacitortocreatealowpassresponse.Itisrecommended that the filter have a time constant: tRC > VN/100 Where VN is the peak-peak supply noise in millivolts and tRC is milliseconds. This filter will also increase the start-up time of the LT6700 by reducing the rate at which the supply can change. When |
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