Overview
The TL432BQDBZRQ1, produced by Texas Instruments, is a three-pin adjustable precision shunt regulator. This device is part of the TL43x-Q1 series, known for its thermal stability over a wide temperature range, making it suitable for various automotive and industrial applications. The TL432BQDBZRQ1 offers adjustable output voltages from approximately 2.5 V to 36 V using two external resistors, and it features a sharp turn-on characteristic, making it an excellent replacement for Zener diodes in many applications.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| VREF (Reference Voltage) | VKA = VREF, IKA = 10 mA | 2483 | 2495 | 2507 | mV |
| VI(DEV) (Deviation of Reference Voltage) | TA = –40°C to 125°C | 14 | - | 34 | mV |
| ΔVREF/ΔVKA (Ratio of Change in Reference Voltage to Cathode Voltage) | IKA = 10 mA, ΔVKA = 10 V – VREF | -1.4 | -2.7 | - | mV/V |
| IREF (Reference Current) | IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ | 2 | 4 | - | µA |
| II(DEV) (Deviation of Reference Current) | TA = –40°C to 125°C | 0.8 | - | 2.5 | µA |
| IMIN (Minimum Cathode Current for Regulation) | VKA = VREF | 0.4 | 1 | - | mA |
| IOFF (OFF-state Cathode Current) | VKA = 36 V, VREF = 0 | 0.1 | 1 | - | µA |
| |ZKA| (Dynamic Impedance) | IKA = 1 mA to 100 mA, VKA = VREF, f ≤1 kHz | 0.2 | 0.5 | - | Ω |
Key Features
- Adjustable Output Voltage: The output voltage can be set to any value from approximately 2.5 V to 36 V using two external resistors.
- Sharp Turn-On Characteristic: Makes it an excellent replacement for Zener diodes in many applications.
- Internal Reference and Amplifier: Contains an accurate voltage reference and op-amp, making it versatile for various applications.
- Low Dynamic Impedance: Typically 0.2 Ω, ensuring stable operation.
- High Gain in Open Loop Mode: Suitable for use as a comparator for undervoltage and overvoltage detection.
- No External Capacitor Required: Internally compensated to be stable without an output capacitor between the cathode and anode.
Applications
- Secondary Side Regulation in Flyback SMPSs: Used for regulating the output voltage in flyback switching mode power supplies.
- Zener Replacement: Replaces Zener diodes in applications requiring adjustable voltage regulation.
- Voltage Monitoring: Used in undervoltage and overvoltage detection circuits.
- Comparator with Integrated Reference: Utilized in comparator circuits due to its high gain and integrated reference.
- Adjustable Power Supplies: Employed in adjustable power supply designs for precise voltage regulation.
- Switching Power Supplies: Used in various switching power supply configurations for efficient voltage regulation.
Q & A
- What is the adjustable output voltage range of the TL432BQDBZRQ1?
The output voltage can be set to any value from approximately 2.5 V to 36 V using two external resistors.
- What is the typical dynamic impedance of the TL432BQDBZRQ1?
The typical dynamic impedance is 0.2 Ω.
- Can the TL432BQDBZRQ1 be used as a comparator?
Yes, it can be used as a comparator due to its high gain in open loop mode.
- Does the TL432BQDBZRQ1 require an external capacitor for stability?
No, it is internally compensated and does not require an external capacitor for stability.
- What is the minimum cathode current required for regulation?
The minimum cathode current required for regulation is 0.4 mA.
- What is the reference current (IREF) of the TL432BQDBZRQ1?
The reference current (IREF) is typically 4 µA.
- What are some common applications of the TL432BQDBZRQ1?
Common applications include secondary side regulation in flyback SMPSs, Zener replacement, voltage monitoring, and use in adjustable and switching power supplies.
- How does the TL432BQDBZRQ1 differ from the TL431BQDBZRQ1 in terms of pinout?
The TL432BQDBZRQ1 has a different pinout for the DBZ package compared to the TL431BQDBZRQ1.
- What is the operating temperature range of the TL432BQDBZRQ1?
The operating temperature range is from –40°C to 125°C.
- What is the maximum OFF-state cathode current of the TL432BQDBZRQ1?
The maximum OFF-state cathode current is 1 µA.
