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LM293ADR bảng dữ liệu(PDF) 9 Page - Texas Instruments

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80- A
µ
Current Regulator
80 µA
60 µA
10 µA
VCC
10 µA
OUT
GND
IN+
IN−
Epi-FET
Diodes
Resistors
Transistors
COMPONENT COUNT
1
2
2
30
LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V
www.ti.com
SLCS005Y – OCTOBER 1979 – REVISED JUNE 2015
7 Detailed Description
7.1 Overview
The LM2903 is a dual comparator with the ability to operate up to 36 V on the supply pin. This standard device
has proven ubiquity and versatility across a wide range of applications. This is due to very wide supply voltages
range (2 V to 36 V), low Iq and fast response of the devices.
The open-drain output allows the user to configure the output's logic low voltage (VOL) and can be used to enable
the comparator to be used in AND functionality.
7.2 Functional Block Diagram
Figure 6. Schematic (Each Comparator)
7.3 Feature Description
LM2903 consists of a PNP darlington pair input, allowing the device to operate with very high gain and fast
response with minimal input bias current. The input Darlington pair creates a limit on the input common mode
voltage capability, allowing LM2903 to accurately function from ground to VCC–1.5V differential input. This is
enables much head room for modern day supplies of 3.3 V and 5 V.
The output consists of an open drain NPN (pull-down or low side) transistor. The output NPN will sink current
when the positive input voltage is higher than the negative input voltage and the offset voltage. The VOL is
resistive and will scale with the output current. See Figure 3 for VOL values with respect to the output current.
7.4 Device Functional Modes
7.4.1 Voltage Comparison
The LM2903 operates solely as a voltage comparator, comparing the differential voltage between the positive
and negative pins and outputting a logic low or high impedance (logic high with pullup) based on the input
differential polarity.
Copyright © 1979–2015, Texas Instruments Incorporated
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Product Folder Links: LM193 LM293 LM293A LM393 LM393A LM2903 LM2903V


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