Tl431 is a controllable precision voltage regulator. Its output voltage can be arbitrarily set to any value from Vref (2.5V) to 36V with two resistors. The device's typical dynamic impedance is 0.2Ω, which is used in many applications to replace Zener diodes, such as digital voltmeters, op amp circuits, adjustable voltage supplies, switching power supplies, and more.
Tl431 is produced by Texas Instruments, the so-called tl431 is a three-terminal adjustable shunt reference source with good thermal stability. Its output voltage can be arbitrarily set to any value digital voltmeter from Vref (2.5V) to 36V with two resistors, op amp circuit, adjustable voltage power supply, switching power supply and so on.
Tl431 package:
Tl431 is a shunt regulator integrated circuit. Because of its good performance and low price, it is widely used in various power circuits. The package form is the same as that of the plastic triode 9013, as shown in FIG. Similar products have the double in-line shape shown in Figure b.
Package form: TO - 92, SOT - 89, SOT - 23
Tl431 main parameters:Three-terminal adjustable shunt reference source
Programmable output voltage: 2.5V~36V
Voltage reference error: ±0.4%, typical value @25°C (tl431B)
Low dynamic output impedance: 0.22 Ω (typical)
Equivalent full range temperature coefficient: 50 ppm/°C (typical)
Temperature compensation operation full rated operating temperature range
The voltage regulation value is continuously adjustable from 2.5--36V.
Reference voltage original error +-1.0%,
Low dynamic output resistance,
Typical value is 0.22 ohms.
The output current is 1.0--100 mA.
Flat temperature characteristics over the full temperature range,
Typical value is 50ppm,
Low output voltage noise.
Package: TO-92, PDIP-8, Micro-8, SOIC-8, SOT-23
The maximum input voltage is 37V
Maximum operating current 150mA
Internal reference voltage is 2.5V
Output voltage range is 2.5~36V
With the advent of 5G era, people put forward higher requirements on all aspects of indoor coverage. Due to difficulties in deployment and limited capacity growth, the traditional Das solution is not suitable for the development trend of 5G. The 4G distributed pick-up station can support 5G NR through modification. Project implementation is relatively simple, can achieve 4 × 4. MIMO has excellent capacity and performance, suitable for a variety of scenarios of 5G indoor coverage. This paper studied the layout position of Pico RRU in distributed Pico base station construction scheme, and designed the Pico RRU automatic layout function based on genetic algorithm in the drawing, in order to improve the efficiency of indoor power distribution system design
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