Circuit function A reference voltage generating circuit is fabricated using an ordinary Zener diode or a temperature-compensated Zener diode. Current consumption is up to 10MA. For battery-operated electronic instruments, if the current consumption is large and the power consumption of the power supply is too large, it is uneconomical, so a circuit with a small driving current and good stability is required. This circuit is a combination of a bandgap reference diode that operates at a small bias current and a low current OP amplifier, consuming only 30 UA. Circuit working principle The LM385-2.5 is a 20 UA reference voltage generator with a terminal voltage of 2.5V ± 3% and a temperature coefficient of 20 PPM / ° C. In this circuit, the OP amplifier is only used as a non-inverting amplifier. To make the output voltage +10V, the voltage amplification factor must be 4 times and R3=R2(A-1). The feedback resistor cannot consume power, so take a high resistance value, R3. = 1.5M, when R2 = 500K, the current consumption is 2UA. In the LM385, R1=500K, the current flowing through is 25UA, the OP amplifier uses the current limiting resistor R4 to reduce the current to several UA, and the entire circuit 4250 is VOO=±1.5V. The OP amplifier that can work is suitable for battery driving. Safety Light Curtain,Safety Curtain,Laser Safety Light Curtain,Safety Optic Light Curtain,Security Light Curtain,Press Brake Safety Light Curtains Jining KeLi Photoelectronic Industrial Co.,Ltd , https://www.sdkelien.com
Low-power reference voltage generation circuit with current consumption of only 30 UA - News - Global IC Trade Starts Here Free
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