LM393 low power dual voltage comparator parameters, pins, application details

Dual voltage comparator LM393 It consists of two independent 、 Accurate voltage comparator composition , The offset voltage shall not exceed 2.0mV, It can work under single power supply or dual power supply , And its current is not affected by the magnitude of the power supply voltage .LM393 The comparator has a unique performance , Even when working under a single power supply , Its input common mode voltage range can also reach zero level . Dual voltage comparator LM393 The chip uses SOP-8 Package form , It is mainly used in consumer and industrial electronic products . Customers often consult Dongwo Electronics LM393 This dual voltage comparator , Next , Dongwo electronics from LM393 characteristic 、 Pin 、 Parameters 、 Instructions and application details , I hope I can help you in confusion ！

LM393 Dual voltage comparator features

√ The working power supply voltage range is wide ： Single power supply : 2.0V~36V; Dual power supply : ±1.0V~±18V
√ Low power supply current : 0.8mA Independent of the supply voltage
√ Input bias current is low : 25nA
√ Input offset current is low : 5.0nA
√ The input offset voltage is low : 5.0mV
√ The range of input differential voltage is consistent with the range of power supply voltage
√ But with TTL、DTL、ECLMOS and CMOS compatible

LM393 Dual voltage comparator pin

LM393 The pin diagram of dual voltage comparator is as follows ：‘’

LM393 Parameters of dual voltage comparator

LM393 The parameters of dual voltage comparator are shown in the figure below ：

LM393 Instructions for dual voltage comparator

LM393 It's high gain 、 Broadband devices , Like most comparators , If there is parasitic capacitance from output to input, coupling will occur , It is easy to produce oscillation. This phenomenon only occurs when the comparator changes state , Gap of output voltage transition . Power supply plus bypass filtering can not solve this problem , standard PC The design of the board is helpful to reduce the parasitic capacitance coupling between input and output . Reduce the input resistance to less than 10KΩ The feedback signal will be reduced , And increase even a small amount of positive feedback ( Hysteresis 1.0~10mV) Can lead to fast conversion , It makes it impossible to produce oscillation caused by parasitic capacitance . Unless you take advantage of lag , Otherwise, insert it directly IC And adding resistance to the pin will cause the input - The switching period of the output is very short , If the input signal is a pulse waveform , And the rise and fall time is quite fast , Then the hysteresis will not need . All unused pins of the comparator must be grounded .

LM393 The bias network establishes its quiescent current and supply voltage range 20~30V irrelevant . Usually, the power supply does not need to add bypass capacitor , The differential input voltage can be greater than VCC Does not damage the device . The protection part must be able to prevent the input voltage from exceeding... To the negative terminal -0.3V.

LM393 The output part of the is an open collector , Emitter grounded NPN Output transistor , Multiple collector outputs can be used to provide or function . The output load resistance can be connected to any supply voltage within the allowable supply voltage range , Not subject to VCC Limit of terminal voltage value . This output can be used as a simple ground SPS Open the way ( When the load resistance is not used ), The trap current of the output part is driven by the possible drive and device B Limited by value . When the limit current is reached (16mA) when , The output transistor will exit and the output voltage will rise soon . The output saturation voltage is about... By the output transistor 60Ω Of γSAT Limit . When the load current is very small , Low offset voltage of output transistor ( about 1.0mV) Allow the output box to be at zero level .

LM393 Typical application of dual voltage comparator