仕様
| 属性 | 値 |
| Package / Case | Tube |
| Part Status | Active |
| Output Type | Transistor Driver |
| Function | Step-Up, Step-Down, Step-Up/Step-Down |
| Output Configuration | Positive, Isolation Capable |
| Topology | Boost, Buck, Buck-Boost, Flyback, Forward |
| Number of Outputs | 1 |
| Output Phases | 1 |
| Voltage - Supply (Vcc/Vdd) | 12V ~ 28V |
| Frequency - Switching | Up to 500kHz |
| Duty Cycle(Max) | 97% |
| Synchronous Rectifier | No |
| Clock Sync | No |
| Control Features | Frequency Control |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole |
概要
Description
The UC2843N is a high-performance, fixed frequency, current-mode PWM (Pulse Width Modulation) controller commonly used in DC-DC converters and switch-mode power supplies. It provides effective load regulation and offers features such as a precision reference, an undervoltage lockout, a high-current totem pole output, and a short-circuit protection. With an operating frequency up to 500 kHz, the UC2843N facilitates efficient power conversion in various electronic applications.
Key features include a start-up current of less than 1 mA, a low total standby current, and a high-speed oscillator. It supports a wide range of input voltages, making it suitable for both commercial and industrial applications. The device is designed to operate over a temperature range from -40°C to +85°C, ensuring reliability in harsh environments.
The UC2843N is commonly used in power supply designs for its ability to control power delivery efficiently, and its compact size makes it ideal for space-constrained applications. Overall, the UC2843N is valued for its robustness and versatility in power management.
Key features include a start-up current of less than 1 mA, a low total standby current, and a high-speed oscillator. It supports a wide range of input voltages, making it suitable for both commercial and industrial applications. The device is designed to operate over a temperature range from -40°C to +85°C, ensuring reliability in harsh environments.
The UC2843N is commonly used in power supply designs for its ability to control power delivery efficiently, and its compact size makes it ideal for space-constrained applications. Overall, the UC2843N is valued for its robustness and versatility in power management.
Equivalent
The UC2843N is a PWM controller commonly used in switch-mode power supplies. Equivalent products include:
1. TL2843
2. UC3843
3. LM2843
4. NCP3843
5. KA3843
6. FAN3843
These alternatives generally offer similar functionality and can often be used interchangeably, but always check the datasheet to confirm compatibility with your specific application requirements.
1. TL2843
2. UC3843
3. LM2843
4. NCP3843
5. KA3843
6. FAN3843
These alternatives generally offer similar functionality and can often be used interchangeably, but always check the datasheet to confirm compatibility with your specific application requirements.
Features
The UC2843N is a high-performance current mode PWM controller designed for DC-DC converters, offering precise control for power supply designs. Key features include:
1. Current Mode Control: Provides improved transient response and cycle-by-cycle current limiting.
2. Wide Supply Voltage Range: Operates from a wide input voltage range, typically 7V to 30V.
3. Oscillator Frequency: Allows for adjustable frequency operation, typically up to 500kHz.
4. High Gain Error Amplifier: Ensures accurate voltage regulation.
5. Undervoltage Lockout (UVLO): Includes threshold protection to ensure safe start-up conditions.
6. Duty Cycle Range: Offers a maximum duty cycle of less than 100% to prevent transformer saturation.
7. Low Startup and Operating Current: Ensures efficiency and low power consumption.
8. Output Drive: Capable of driving power MOSFETs directly.
These features make the UC2843N suitable for a variety of power management applications, including power supplies, battery chargers, and DC-DC converters, where efficient and reliable performance is essential.
1. Current Mode Control: Provides improved transient response and cycle-by-cycle current limiting.
2. Wide Supply Voltage Range: Operates from a wide input voltage range, typically 7V to 30V.
3. Oscillator Frequency: Allows for adjustable frequency operation, typically up to 500kHz.
4. High Gain Error Amplifier: Ensures accurate voltage regulation.
5. Undervoltage Lockout (UVLO): Includes threshold protection to ensure safe start-up conditions.
6. Duty Cycle Range: Offers a maximum duty cycle of less than 100% to prevent transformer saturation.
7. Low Startup and Operating Current: Ensures efficiency and low power consumption.
8. Output Drive: Capable of driving power MOSFETs directly.
These features make the UC2843N suitable for a variety of power management applications, including power supplies, battery chargers, and DC-DC converters, where efficient and reliable performance is essential.
Pinout
The UC2843N is a high-performance current-mode PWM controller used primarily in power supply applications. It typically comes in an 8-pin DIP package. Here is a brief overview of the pin functions:
1. Pin 1 (COMP): Compensation. This pin is used for error amplifier compensation.
2. Pin 2 (VFB): Voltage Feedback. It serves as the inverting input to the error amplifier.
3. Pin 3 (ISENSE): Current Sense. Used for current limiting by monitoring current through a resistor.
4. Pin 4 (RT/CT): Oscillator Timing. Sets the oscillator frequency with an external resistor and capacitor.
5. Pin 5 (GND): Ground. Common ground reference for the device.
6. Pin 6 (OUTPUT): Output. Drives the gate of a power MOSFET.
7. Pin 7 (VCC): Supply Voltage. Powers the IC.
8. Pin 8 (VREF): Reference Voltage. Provides a stable 5V reference output.
This chip is widely used in switch-mode power supplies due to its efficient performance in regulating output voltage and current.
1. Pin 1 (COMP): Compensation. This pin is used for error amplifier compensation.
2. Pin 2 (VFB): Voltage Feedback. It serves as the inverting input to the error amplifier.
3. Pin 3 (ISENSE): Current Sense. Used for current limiting by monitoring current through a resistor.
4. Pin 4 (RT/CT): Oscillator Timing. Sets the oscillator frequency with an external resistor and capacitor.
5. Pin 5 (GND): Ground. Common ground reference for the device.
6. Pin 6 (OUTPUT): Output. Drives the gate of a power MOSFET.
7. Pin 7 (VCC): Supply Voltage. Powers the IC.
8. Pin 8 (VREF): Reference Voltage. Provides a stable 5V reference output.
This chip is widely used in switch-mode power supplies due to its efficient performance in regulating output voltage and current.
Manufacturer
The UC2843N is manufactured by Texas Instruments. Texas Instruments is a global semiconductor company that designs and manufactures a range of electronic products, including analog and embedded processing chips. The company is well-known for producing integrated circuits and other semiconductor devices that are used in various applications across industries such as consumer electronics, automotive, industrial, and communications equipment.
Application
The UC2843N is a fixed-frequency current-mode PWM controller commonly used in switch-mode power supplies (SMPS) and DC-DC converters. Its applications include power supply units for computers, battery chargers, industrial power supplies, and consumer electronics. It is also used in motor control systems, telecommunications equipment, and LED drivers. The device’s features, such as low start-up current, high-speed operation, and stability over a wide range of input voltages, make it suitable for efficient and reliable power management in various electronic devices and systems.
Package
The UC2843N is typically available in an 8-pin Dual In-line Package (DIP-8). This type of package is commonly used for integrated circuits and is designed for through-hole mounting on printed circuit boards.
