LM7341_15 datasheet(19/27 Pages) TI

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+VCC = +30V

12.1 k:

VOUT

VREF = +15V

20:

VIN

VOUT HIGH

VOUT LOW

VA2

+VCC

VA1

+VCC

14.975

VIN

30V

VOUT

15.025

VA2

VA1

+VCC = +30V

4.02 k:

1.21 M:

VOUT

VIN

LM7341

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SNOSAW9B – MAY 2008 – REVISED MARCH 2013

Figure 55. Inverting Comparator with Hysteresis

NON-INVERTING COMPARATOR WITH HYSTERESIS

A non-inverting comparator with hysteresis requires a two resistor network, and a voltage reference (VREF) at the

inverting input. When VIN is low, the output is also low. For the output to switch from low to high, VIN must rise up

to VIN1 where VIN1 is calculated by

VIN1 = R1*(VREF/R2) + VREF

(4)

When VIN is high, the output is also high, to make the comparator switch back to it's low state, VIN must equal

VREF before VA will again equal VREF . VIN can be calculated by

VIN2 = (VREF (R1+ R2) - VCCR1)/R2

(5)

The hysteresis of this circuit is the difference between VIN1 and VIN2.

Delta VIN = VCCR1/R2

(6)

For example to achieve 50 mV of hysteresis when VCC = 30V set R1 = 20Ω and R2 = 12.1 kΩ.

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