LMC6772AIMMX_NOPB Datasheet, PDF (13/25 Pages) Texas Instruments – Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output

LMC6772
www.ti.com
SNOS749F – SEPTEMBER 1995 – REVISED MARCH 2013
OUTPUT SHORT CIRCUIT CURRENT
The LMC6772 has short circuit protection of 40 mA. However, it is not designed to withstand continuous short
circuits, transient voltage or current spikes, or shorts to any voltage beyond the supplies. A resistor is series with
the output should reduce the effect of shorts. For outputs which send signals off PC boards additional protection
devices, such as diodes to the supply rails, and varistors may be used.
HYSTERESIS
If the input signal is very noisy, the comparator output might trip several times as the input signal repeatedly
passes through the threshold. This problem can be addressed by making use of hysteresis as shown below.
Figure 31. Canceling the Effect of Input Capacitance
The capacitor added across the feedback resistor increases the switching speed and provides more short term
hysteresis. This can result in greater noise immunity for the circuit.
SPICE MACROMODEL
A Spice Macromodel is available for the LMC6772. The model includes a simulation of:
• Input common-mode voltage range
• Quiescent and dynamic supply current
• Input overdrive characteristics
and many more characteristics as listed on the macromodel disk.
A SPICE macromodel of this and many other op amps is available at no charge from the WEBENCH Design
Center Team at www.ti.com
Copyright © 1995–2013, Texas Instruments Incorporated
Product Folder Links: LMC6772
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