可调式精密并联稳压器 ADJUSTABLE PRECISION SHUNT REGULATORS
Description
The TL431 and TL432 devices are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and military temperature ranges. The output voltage can be set to any value between Vref approximately 2.5 V and 36 V, with two external resistors. These devices have a typical output impedance of 0.2 Ω.
Active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The TL432 device has exactly the same functionality and electrical specifications as the TL431 device, but has different pinouts for the DBV, DBZ, and PK packages.
Features
• Reference Voltage Tolerance at 25°C
– 0.5% B Grade
– 1% A Grade
– 2% Standard Grade
• Adjustable Output Voltage: Vref to 36 V
• Operation From −40°C to 125°C
• Typical Temperature Drift TL431B
– 6 mV C Temp
– 14 mV I Temp, Q Temp
• Low Output Noise
• 0.2-Ω Typical Output Impedance
• Sink-Current Capability: 1 mA to 100 mA
Applications
• Adjustable Voltage and Current Referencing
• Secondary Side Regulation in Flyback SMPSs
• Zener Replacement
• Voltage Monitoring
• Comparator with Integrated Reference