OPA369 datasheet(11/19 Pages) TI

11 / 19 page

WINDOW COMPARATOR

V =

R + R

´ VS

(5)

V =

R + R

´ VS

(6)

(2)

10kW

5.1kW

2kW

(1)

(3)

1/2

OPA2369

1/2

OPA2369

OUT

NOTES: (1)R

protectsA1andA2frompossibleexcesscurrentflow.

(2)IN4446orequivalentdiodes.

(3)2N2222orequivalentNPNtransistor.

OPA369

OPA2369

www.ti.com ............................................................................................................................................ SBOS414B – AUGUST 2007 – REVISED DECEMBER 2008

If VIN falls below VL, the output of A2 is high, current

flows through D2, and VOUT is low. Likewise, if VIN

Figure 26 shows the OPA2369 used as a window

rises above VH, the output of A1 is high, current flows

comparator. The threshold limits are set by VH and

through D1, and VOUT is low. The window comparator

VL, with VH > VL. When VIN < VH, the output of A1 is

threshold voltages are set as follows:

low. When VIN > VL, the output of A2 is low.

Therefore, both op amp outputs are at 0V as long as

VIN is between VH and VL. This architecture results in

no current flowing through either diode, Q1 in cutoff,

with the base voltage at 0V, and VOUT forced high.

Figure 26. OPA2369 as a Window Comparator

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