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LP2901-Q1 Datasheet(PDF) 4 Page - Texas Instruments |
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LP2901-Q1 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 8 page ![]() www.ti.com APPLICATION INFORMATION IN + IN − OUT 30 k Ω + − VCC 1/4 LP2901 IN + IN − 100 k Ω 1/4 LP2901 1/4 SN54/74LS00 or 1/4 SN54/74ALS1000A VCC + − 12 3 OUT VCC VO Q2 Q1 Q3 I1 = 6 µA LP2901-Q1 LOW-POWER QUAD DIFFERENTIAL COMPARATOR SLCS148 – SEPTEMBER 2005 Figure 1 shows the basic configuration for using the LP2901 comparator. Figure 2 shows the diagram for using it as a CMOS driver. Figure 1. Basic Comparator Figure 2. CMOS Driver All pins of any unused comparators should be grounded. The bias network of the LP2901 establishes a drain current that is independent of the magnitude of the power-supply voltage over the range of 2 V to 30 V. It usually is necessary to use a bypass capacitor across the power-supply line. The differential input voltage may be larger than VCC without damaging the device. Protection should be provided to prevent the input voltages from going negative by more than –0.3 V. The output section has two distinct modes of operation, the Darlington mode and the ground-emitter mode. This unique drive circuit permits the device to sink 30 mA at VO = 2 V in the Darlington mode and 700 µA at VO = 0.4 V in the ground-emitter mode. Figure 3 is a simplified schematic diagram of the output section. The output section is configured in a Darlington connection (ignoring Q3). If the output voltage is held high enough (above 1 V), Q1 is not saturated and the output current is limited only by the product of the hFE of Q1, the hFE of Q2, and I1 and the 60-Ω saturation resistance of Q2. The devices are capable of driving LEDs, relays, etc. in this mode while maintaining an ultra-low power-supply current of 60 µA typical. Figure 3. Output-Section Schematic Diagram 4 |
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