KA7905A
Negative voltage linear regulators for power management applications
Manufacturer： ['fairchild', 'rochester', 'onsemi', 'freescale']
series introduction
# Introduction to the KA7905A Product Series
## 1. Overview
The KA7905A product series belongs to the category of negative voltage regulators. These regulators play a crucial role in electronic circuits by providing a stable and regulated negative output voltage. In many electronic systems, there is a need for both positive and negative power supplies to drive different components such as operational amplifiers, analog - to - digital converters, and other integrated circuits. The KA7905A series is designed to meet this demand by offering a reliable and efficient solution for generating a - 5V output voltage.
## 2. Key Features
### 2.1 Output Voltage Regulation
The primary function of the KA7905A is to provide a precisely regulated - 5V output voltage. It can maintain this voltage within a tight tolerance even when the input voltage and load current vary. This is essential for the proper operation of sensitive electronic components that require a stable power supply. For example, in a data acquisition system, a stable - 5V supply is necessary for accurate analog - to - digital conversion.
### 2.2 Low Dropout Voltage
The KA7905A has a relatively low dropout voltage. Dropout voltage is the minimum difference between the input voltage and the output voltage required for the regulator to maintain regulation. A low dropout voltage means that the regulator can operate with a smaller input - output voltage differential, which is beneficial in battery - powered applications or systems where power efficiency is a concern. For instance, in a portable device running on a battery, a low dropout voltage allows the regulator to continue providing a stable - 5V output as the battery voltage gradually decreases.
### 2.3 Thermal Protection
To prevent damage due to overheating, the KA7905A is equipped with thermal protection circuitry. When the temperature of the regulator exceeds a certain threshold, the thermal protection mechanism kicks in and reduces the output current or shuts down the regulator temporarily. This feature ensures the long - term reliability of the device and protects it from thermal stress, which can lead to premature failure.
### 2.4 Short - Circuit Protection
The series also offers short - circuit protection. In the event of a short - circuit at the output, the regulator limits the output current to a safe level, preventing excessive current flow that could damage the regulator and other components in the circuit. This protection feature enhances the overall safety and robustness of the electronic system.
## 3. Technical Specifications
### 3.1 Input Voltage Range
The KA7905A typically has an input voltage range that allows it to operate with a variety of power sources. The input voltage should be higher (in magnitude) than the output voltage by at least the dropout voltage. For example, the input voltage might range from - 7V to - 25V, which provides flexibility in different power supply configurations.
### 3.2 Output Current Capability
The regulator can supply a certain amount of output current to drive the connected load. The KA7905A can typically handle output currents up to a few hundred milliamperes, depending on the specific model and operating conditions. This current - handling capacity makes it suitable for a wide range of applications, from small - scale hobby projects to more complex industrial control systems.
### 3.3 Line and Load Regulation
Line regulation refers to the ability of the regulator to maintain a constant output voltage when the input voltage changes. The KA7905A has excellent line regulation characteristics, ensuring that the - 5V output remains stable even when the input voltage fluctuates. Load regulation, on the other hand, measures the change in output voltage as the load current varies. The series also offers good load regulation, providing a consistent output voltage under different load conditions.
## 4. Applications
### 4.
Images for reference
TO-220-3, TO-220AB
Image Preview