Hangjing has launched a domestically produced high-voltage power operational amplifier.

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.

Hangjing has launched a domestically produced high-voltage power operational amplifier.

In recent years, driven by the growing demand for domestic production in the integrated circuit industry, Hangjing Company has been committed to achieving full domestic sourcing across the entire IC supply chain. Following extensive market research, feasibility studies, and experimental validation, as well as leveraging its own technological expertise and ongoing R&D efforts, the company has now launched a fully domestically produced high‑voltage power operational amplifier designed and manufactured by Hangjing Microelectronics. HJGPA61 A , can fully replace imported components in situ PA61 and OPA541。

I. Overview

HJGPA61 A It is a product that complies with GJB2438 The high-voltage power operational amplifier for thick-film hybrid integrated circuits, as required by the standard, employs BeO The substrate screen-printing thick-film integration process not only effectively reduces the device’s thermal resistance but also enhances its reliability. By incorporating laser trimming, the devices can achieve even lower offset parameters.

HJGPA61A The device features low input offset voltage, low input offset current, a wide supply voltage range, and output… High peak current, etc. Its key feature is that the device’s package has no electrical connections, allowing for easy attachment of a heat sink. This device can drive resistive, capacitive, or inductive loads and is widely used in applications such as motor torque drives, cable actuators, and gyroscopic coil torque‑generating systems.

Table 1 HJGPA61A 、PA61、OPA541 Comparison Table

By comparison, it can be seen that, HJGPA61 A With imported components PA61、OPA541 The package is consistent, the lead‑out terminal functions are identical, and the electrical parameters are essentially the same.

Among them, comparison reveals that although OPA541 It offers the advantage of extremely low input offset parameters, but its typical quiescent current is 20mA , far exceeding the other two devices. When OPA541 When the device operates under high supply‑voltage conditions, its monolithic integrated design results in poor thermal dissipation, and the device itself exhibits substantial thermal power consumption, leading to severe self‑heating. HJGPA61A By employing a thick-film integrated design process, the device’s thermal resistance is not only significantly reduced but its reliability is also enhanced. HJGPA61A Compared to OPA541 It features lower thermal power consumption and superior heat dissipation, outperforming… OPA541。

Overall comparison: domestic aerospace-grade components HJGPA61 A Capable of fully replacing imported components. PA61 and OPA541。

II. Electrical Principle Block Diagram

 

Figure 1 HJGPA61A Principle block diagram

III. Package Type and Lead Terminal Functions

1 . Package type

Adopt TO-3-L Encased in a fully sealed metal housing, with external dimensions as shown in the figure below. 2 , See the product photos in the figure. 3。

 

 

Figure 2: Dimensional drawing of the TO-3-L all-metal hermetic package Figure 3: Actual photograph of the HJGPA61A product

2 . Lead-out terminal function

Table 2   Package Pin Function Table

Pin	Symbol	Functionality	Pin	Symbol	Functionality
1	OUT	Output	8	CL-	Current-limiting resistor
2	CL+	Current-limiting resistor	7	NC	Empty foot
3	+VS	Positive power supply	6	-VS	Negative power supply
4	+IN	Non-inverting input	5	-IN	Inverting input

IV. Electrical Characteristics

Unless otherwise specified, V _CC  =  +45V ， V _EE  = -45V， T _A  =  +25℃ 。

Table 3 Electrical Characteristics Table

Parameter Name	Test conditions	Standard value			Unit
		Minimum value	Typical value	Maximum value
Input offset voltage			±1	± 6	mV
Input Offset Voltage Temperature Drift *	-55℃~+125℃		±10	±100	uV/°C
Input bias current			12	30	nA
Input bias current temperature drift *	-55℃~+125℃		±50	±500	pA/°C
Input Offset Current			±12	±30	nA
Input Offset Current Temperature Drift *	-55℃~+125℃		±100		pA/°C
Input resistance *			100		MΩ
Common-mode input voltage range *		±V S -10	±V S -5		V
Common-mode rejection ratio		64	80		dB
Open-loop gain		96	110		dB
Gain-bandwidth product			1		M Hertz
Power bandwidth	I O =2A ， V O =60V PP	5	15		kilohertz
Output voltage	I O =5A	±V S -10	±V S -5		V
	I O =2A	±V S -7	±V S -4
	I O =35 mA	±V S -6
Continuous output current		± 8			A
Quiescent current			5	12	mA

Note: With * The parameter is the design guarantee.

 

 

 

 

 

V. Typical Applications

 

 

  HJGPA61 Typical Application Diagram

    1.R4 and R5 It refers to the output sourcing current of an operational amplifier ( Source ) and injection current ( Sink ) current‑limiting protection resistor; when the output current exceeds the set threshold, the current‑limiting resistor activates the protection circuit to prevent output‑stage short circuits that could lead to device failure.

    2. When operating in high‑power output conditions, an appropriate heat sink must be added to prevent heat from accumulating and damaging the device.

VI. Relevant Products and Domestic Substitution Status

  

   Table 4   Product substitute

Serial number	Product Name	Imported model	Aviation crystal model	Alternative form
1	Power operational amplifier	LH0021	HJ0021	In-situ substitution
2	Power operational amplifier	LH0041	HJ0041	In-situ substitution
3	Buffer	LH0002	HJ0002	In-situ substitution
4	High-Voltage Power Operational Amplifier	PA83	HJPA83	In-situ substitution
5	High-Temperature, High-Current Operational Amplifier	OPA544	HJ544C	In-situ substitution
6	Dual-channel power amplifier	OPA2544	HJ2544C	Functional substitution