A New Breakthrough in Aviation‑Grade Operational Amplifiers: An Op‑Amp with Ultra‑High Supply Voltage and Ultra‑High Slew Rate Has Been Successfully Developed.

In modern electronic devices, operational amplifiers are an indispensable component. Particularly in the design of domestically produced op‑amp circuits, selecting appropriate components and optimizing the circuit architecture have become focal points for many engineers. Today, we will delve into the key principles and techniques of designing domestic op‑amp circuits, helping you elevate your circuit‑design expertise. 1. Understand the Basic Characteristics of Operational Amplifiers First and foremost, when designing a domestic op‑amp circuit, it is essential to grasp the amplifier’s fundamental characteristics. The core performance of an op‑amp hinges on parameters such as gain, input impedance, and output impedance. Gain determines the signal‑amplification capability; input impedance affects the source‑load interaction; and output impedance influences the signal‑transmission efficiency. Only by thoroughly understanding these basic traits can we proceed with more effective circuit design. 2. Choose the Right Domestic Operational Amplifier While the market offers a wide array of domestically manufactured op‑amps, not every model is suitable for your specific project. When making your selection, consider several critical factors: bandwidth, power consumption, operating temperature range, and cost. For instance, if your application involves high‑frequency signal processing, bandwidth becomes the primary consideration. Conversely, for projects with stringent low‑power requirements, prioritize low‑power consumption.

A New Breakthrough in Aviation‑Grade Operational Amplifiers: An Op‑Amp with Ultra‑High Supply Voltage and Ultra‑High Slew Rate Has Been Successfully Developed.

I. R&D Background

The operational amplifier is a core foundational component of analog circuits, often hailed as the “heart” of the analog world.   “ Heart ” and   “ Nerve endings ” , it plays a critical role in signal sensing, amplification, conversion, and driving. Without an operational amplifier, sensor signals would be difficult to detect, ADC High‑precision sampling is impossible, and the control loop is difficult to close. As the most widely used and heavily manufactured fundamental building block in analog integrated circuits, the performance of operational amplifiers directly determines the signal chain’s accuracy, speed, and stability.

Operational amplifiers come in a wide variety; based on manufacturing technology, they can be classified as bipolar-type, CMOS 、 BiCMOS ; In terms of performance, they encompass general‑purpose, precision, high‑speed, low‑power, low‑noise, and high‑voltage types. At present, domestically produced consumer‑grade low‑voltage, low‑power operational amplifiers have already… Basic Achieve All Domestic substitution is underway, but in high-end segments such as high supply voltage and high slew rate, the market has long been dominated by… MSK 、 APEX While international giants maintain a monopoly, this type of operational amplifier is widely used in motor drives and automotive applications. BMS In critical equipment sectors such as photovoltaic inverters and specialized power supplies, the need for independent and controllable capabilities is extremely urgent.

Shaanxi Hangjing Microelectronics Co., Ltd., which has specialized in high-voltage, high-temperature, and high-reliability analog chips for more than twenty years, has broken the monopoly. Core Strength. Since 2001 Since its establishment, Hangjing Microelectronics Focusing on analog circuit signal chains, the company has amassed extensive engineering expertise in areas such as radiation-hardened operational amplifiers and wide‑temperature‑range applications, and has successively developed HJPA83 (low-noise, high-voltage operational amplifier), HJGPA61 (high-voltage, high-power operational amplifier), HJGPA85 Including the high‑voltage, high‑speed operational amplifier and several other benchmark products, the company boasts industry‑leading technical capabilities, with certain performance metrics matching or even surpassing those of top international brands.

This time, Hangjing Microelectronics Breaking new ground once again, we have launched a fully domestically produced operational amplifier with ultra‑high voltage and ultra‑high slew rate. HJPA194， Its supply voltage is as high as ±350V , the slew rate is 1600 V/μs , can completely replace foreign products APEX Company PA194 This breakthrough provides a domestically developed, technology‑independent solution for high‑end applications such as piezoelectric ceramic actuators, semiconductor probe stations, electrostatic deflection systems, and high‑voltage nanosecond pulse sources, highlighting the strength of China’s analog chip industry in… “ No-man's land ” The hard power to break through and drive deep, sustained progress.

 

Table 1 PA194 and HJPA194 Electrical Parameter Comparison Table

Test ambient temperature T _A =25℃

As can be seen from the comparison of electrical parameters, HJPA194 With imports PA194 The key performance indicators exhibit high overall compatibility, with core parameters such as input offset voltage, continuous output current, and standby quiescent current being completely identical. Slight variations are observed in the gain–bandwidth product, slew rate, supply voltage, and operating‑mode quiescent current; under typical operating conditions and standard electrical‑parameter application scenarios, HJPA194 Can achieve the… PA194 In-situ compatible substitution.

 

II. Electrical Schematic Diagram

Figure 1  HJPA194 Electrical Principle Block Diagram

 

III. Package Type and Lead Terminal Functions

1. Package Type

Adopt a power housing SIP8 Package, physical dimensions And the actual product photos are as follows: 。

Figure 2  Power housing SIP8 Enclosure Dimension Diagram

 

 

2. Arrangement and Functions of Lead-Out Terminals

Figure 3 HJPA194 Pin Function Diagram

Table 1 Output Terminal Function Table

 

IV. Absolute Maximum Ratings

Power supply voltage -V _S ~+V _S                ±350V          Continuous output current 100mA

Differential input voltage                  ±20V Dissipated power 30W

Operating temperature range -55℃ ~ +125℃         Lead wire soldering temperature resistance ( 10s ) +300℃

Storage temperature range -65℃ ~ +150℃

 

V. Electrical Characteristics

Unless otherwise specified, ±V _S =±90V ， T _A =+25℃ 。

Note: With * The parameters are solely for design assurance.

 

VI. Typical Applications

 

Figure 4 HJPA194 Typical Application Diagram

 

The above figure shows an operational amplifier. HJPA194 The simplified circuit diagram constitutes a basic inverting amplifier configuration.

1. Overcurrent protection function

HJPA194 The device features an internally integrated overcurrent protection circuit, which can be easily implemented by connecting an external current-limiting resistor. R1 This allows you to configure the device’s peak output current capability; the specific calculation follows the relationship described in the formula below:

Among them, the resistor R1 The unit is Omega , electric current I _LIM The unit is A 。

2. Compensation Capacitor Adjustment

HJPA194 It is an ultra‑high‑voltage, high‑speed operational amplifier, featuring high gain, an exceptionally high slew rate, and wide bandwidth. To prevent signal distortion caused by self‑oscillation or external noise interference during operation, the device supports external compensation capacitance. C1 Compensate its frequency response to enhance signal quality and reduce the signal-to-noise ratio.

The selection of compensation capacitors must adhere to a key principle: the higher the gain setting, the smaller the capacitance value of the chosen capacitor should be. If the application demands higher gain and bandwidth, a compensation capacitor may be omitted altogether. Additionally, ensure that the capacitor’s maximum voltage rating exceeds the device’s maximum operating voltage to guarantee stable and reliable operation.

3 , Low-Power Mode Operating State

Compared with conventional high-voltage, high-bandwidth operational amplifiers, HJPA194 A selectable low-power operating mode has been added. In high-voltage applications, conventional high-voltage‑powered operational amplifiers experience increased self‑generated thermal power dissipation, necessitating well‑designed thermal management while potentially compromising device reliability and service life.

HJPA194 Can be achieved by applying Mode Connect the pin to the device’s negative power supply terminal to put the device into low-power mode. In this mode, the device’s bandwidth and slew rate are reduced compared to normal mode, but the quiescent current will decrease from that of normal mode… 25mA Drop to 5mA , the intrinsic thermal power consumption has been reduced to its original level 1/5 , effectively optimizing thermal management efficiency and enhancing the long-term operational reliability of the device.

4 , Input differential protection network

HJPA194 The input differential voltage range is ±20V To further enhance the device’s immunity to interference and prevent damage to the input port, an additional input differential protection network should be configured. It is recommended to refer to the typical application circuit diagram and connect two external diodes. D1、D2 To implement the protection function, a general-purpose diode can be selected. 1N4148。

5 , power supply filtering network

To prevent HJPA194 It generates parasitic oscillations and suppresses high-frequency noise introduced at the power supply terminals; therefore, bypass capacitors must be placed as close as possible to the device’s power pins, and high‑quality ceramic capacitors should be selected. It is recommended to use… 0.1 μF and 1μF Capacitors are connected in parallel as bypass capacitors to achieve noise suppression across the entire frequency range.

When the device operates in high‑current output mode, the bypass capacitor value should be increased to ensure that the power supply can deliver sufficient transient energy, thereby maintaining stable load drive and preventing performance anomalies caused by inadequate power delivery.

6、HJPA194 Precautions for Use

1 ) It is particularly important to note that, HJPA194 Typically used in ultra-high-voltage power supply environments, which are characterized by a variety of potential safety risks and electrical hazards. Therefore, users are strongly advised to prioritize, during equipment commissioning, the use of… ±50V Under the relatively safe power‑supply mode, all critical parameters are calibrated and optimized, performance characteristics are verified and fine‑tuned, and all types of faults are meticulously inspected and completely eliminated. Once the equipment has been thoroughly debugged under low‑voltage conditions and is operating stably and reliably, it will then be gradually transitioned to actual high‑voltage operating conditions for more rigorous testing and final system commissioning.

2 ) HJPA194 The device internally employs beryllium oxide ( BeO ) The substrate plays a critical role in reducing the device’s overall thermal resistance, thereby enhancing heat dissipation performance and thermal management efficiency. Special attention must be paid: if the substrate sustains mechanical impacts or external compressive forces during installation, transportation, or handling, it may not only lead to functional failure or degraded performance but also release fine beryllium oxide powder that can become airborne and enter the human body via the respiratory system, posing a potential health hazard. Therefore, throughout device application and operation, heightened vigilance is essential, and adequate protective measures must be implemented to ensure safe use.

3 ) HJPA194 The static operating current is relatively high, leading to significant heat accumulation and thermal effects during operation. The device’s core design aims to maximize the conduction of internally generated heat to a dedicated heat-sink block at the bottom of the device, thereby providing preliminary thermal management. Consequently, in practical applications, effective secondary cooling measures must be implemented on this basis; otherwise, the junction temperature inside the device ( Tj ) will rise and exceed the safe range.