Specifications
| Attribute | Value |
| Package / Case | Tube |
| Part Status | Active |
| Output Type | Transistor Driver |
| Function | Step-Up, Step-Up/Step-Down |
| Output Configuration | Positive, Isolation Capable |
| Topology | Boost, Flyback |
| Number of Outputs | 1 |
| Output Phases | 1 |
| Voltage - Supply (Vcc/Vdd) | 10V ~ 30V |
| Frequency - Switching | Up to 500kHz |
| Duty Cycle(Max) | 96% |
| Synchronous Rectifier | No |
| Clock Sync | No |
| Control Features | Frequency Control |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Mounting Type | Through Hole |
Overview
Description
The UC3842BNG is a high-performance, fixed-frequency current-mode Pulse Width Modulation (PWM) controller designed for offline and DC-to-DC converter applications. It is part of the UC3842 series, known for offering precise control and efficiency in power supply designs. The device operates at a fixed frequency and features a fast current-sense comparator, high-gain amplifier, and an undervoltage lockout (UVLO) with hysteresis to ensure reliable start-up and operation.
Key features of the UC3842BNG include low start-up current, high-speed oscillator, and built-in protections like overcurrent limiting and thermal shutdown. These features make it ideal for applications requiring a compact, robust, and efficient power management solution, such as in switch-mode power supplies (SMPS), isolated flyback converters, and other power regulation circuits. The device is available in various package options, allowing flexibility in different circuit designs. Its performance and reliability make the UC3842BNG a popular choice for engineers working on power electronics projects.
Key features of the UC3842BNG include low start-up current, high-speed oscillator, and built-in protections like overcurrent limiting and thermal shutdown. These features make it ideal for applications requiring a compact, robust, and efficient power management solution, such as in switch-mode power supplies (SMPS), isolated flyback converters, and other power regulation circuits. The device is available in various package options, allowing flexibility in different circuit designs. Its performance and reliability make the UC3842BNG a popular choice for engineers working on power electronics projects.
Equivalent
The UC3842BNG is a current-mode PWM controller commonly used in power supply designs. Equivalent products include:
1. UC3842AN
2. LM3842N
3. KA3842
4. MC3842
5. TME3842
These alternatives are offered by various manufacturers and provide similar functionality, generally varying slightly in specifications such as temperature range or packaging. Always check the datasheet to ensure compatibility with your specific application.
1. UC3842AN
2. LM3842N
3. KA3842
4. MC3842
5. TME3842
These alternatives are offered by various manufacturers and provide similar functionality, generally varying slightly in specifications such as temperature range or packaging. Always check the datasheet to ensure compatibility with your specific application.
Features
The UC3842BNG is a high-performance current mode PWM controller designed for off-line and DC-to-DC converter applications. Key features include:
1. Current Mode Control: Provides superior performance and simpler loop compensation.
2. High Performance: Offers a maximum duty cycle of 100% with a wide oscillation frequency range.
3. Low Startup Current: Minimizes power consumption during startup.
4. Undervoltage Lockout (UVLO): Ensures the device operates at the correct input voltage levels.
5. Error Amplifier with Low Output Resistance: Enhances stability and response time.
6. Soft Start Capability: Allows for a smooth startup process.
7. High-Current Totem Pole Output: Provides fast switching speeds, suitable for driving power MOSFETs.
8. Built-In Slope Compensation: Prevents subharmonic oscillations in duty cycles greater than 50%.
9. Adjustable Oscillator: Allows frequency customization based on application needs.
These features make the UC3842BNG suitable for a variety of power conversion applications, offering efficiency, reliability, and flexibility.
1. Current Mode Control: Provides superior performance and simpler loop compensation.
2. High Performance: Offers a maximum duty cycle of 100% with a wide oscillation frequency range.
3. Low Startup Current: Minimizes power consumption during startup.
4. Undervoltage Lockout (UVLO): Ensures the device operates at the correct input voltage levels.
5. Error Amplifier with Low Output Resistance: Enhances stability and response time.
6. Soft Start Capability: Allows for a smooth startup process.
7. High-Current Totem Pole Output: Provides fast switching speeds, suitable for driving power MOSFETs.
8. Built-In Slope Compensation: Prevents subharmonic oscillations in duty cycles greater than 50%.
9. Adjustable Oscillator: Allows frequency customization based on application needs.
These features make the UC3842BNG suitable for a variety of power conversion applications, offering efficiency, reliability, and flexibility.
Pinout
The UC3842BNG is a current-mode PWM (Pulse Width Modulation) controller typically used for off-line and DC-to-DC converter applications. It comes in an 8-pin package with the following pinout and functions:
1. Compensation (COMP): This pin is connected to the output of the error amplifier and provides feedback to control the duty cycle of the PWM.
2. Voltage Feedback (VFB): This pin receives the feedback voltage from the output to regulate the output voltage level.
3. Current Sense (CS): This pin is used to sense the current through the power switch. It provides input to the current limit comparator.
4. RT/CT (Timing Resistor/Capacitor): Determines the oscillator frequency by connecting a resistor and capacitor to this pin.
5. Ground (GND): Common ground reference for the device.
6. Output (OUT): This pin is the output driver, used to drive the gate of the power MOSFET or transistor.
7. VCC (Voltage Supply): Supplies power to the controller.
8. VREF (Voltage Reference): Provides a stable reference voltage for internal operations and can be used externally.
These pins collectively facilitate the controller's function in regulating power supply outputs efficiently.
1. Compensation (COMP): This pin is connected to the output of the error amplifier and provides feedback to control the duty cycle of the PWM.
2. Voltage Feedback (VFB): This pin receives the feedback voltage from the output to regulate the output voltage level.
3. Current Sense (CS): This pin is used to sense the current through the power switch. It provides input to the current limit comparator.
4. RT/CT (Timing Resistor/Capacitor): Determines the oscillator frequency by connecting a resistor and capacitor to this pin.
5. Ground (GND): Common ground reference for the device.
6. Output (OUT): This pin is the output driver, used to drive the gate of the power MOSFET or transistor.
7. VCC (Voltage Supply): Supplies power to the controller.
8. VREF (Voltage Reference): Provides a stable reference voltage for internal operations and can be used externally.
These pins collectively facilitate the controller's function in regulating power supply outputs efficiently.
Manufacturer
The UC3842BNG is manufactured by ON Semiconductor, which is now known as onsemi. Onsemi is a leading global supplier of semiconductor-based solutions, focusing on energy-efficient electronics. The company produces a wide range of products, including power management components, sensors, and connectivity solutions, catering to various industries such as automotive, industrial, cloud power, and the Internet of Things (IoT). Onsemi is known for its commitment to sustainability and innovation, aiming to provide technology that enables a smarter, safer, and more sustainable future.
Application
The UC3842BNG is a current-mode PWM controller commonly used in various power supply applications. Its primary application areas include:
1. Switch Mode Power Supplies (SMPS): It's used to regulate voltage in AC-DC and DC-DC converters.
2. Battery Chargers: Helps manage charging cycles efficiently.
3. LED Drivers: Supports stable current supply in LED lighting.
4. Telecommunications: Ensures stable power in telecom equipment.
5. Consumer Electronics: Powers devices like televisions, monitors, and audio systems.
6. Industrial Controls: Used in motor drives and control systems for precise power management.
Its high-performance features make it suitable for applications requiring reliability and efficiency.
1. Switch Mode Power Supplies (SMPS): It's used to regulate voltage in AC-DC and DC-DC converters.
2. Battery Chargers: Helps manage charging cycles efficiently.
3. LED Drivers: Supports stable current supply in LED lighting.
4. Telecommunications: Ensures stable power in telecom equipment.
5. Consumer Electronics: Powers devices like televisions, monitors, and audio systems.
6. Industrial Controls: Used in motor drives and control systems for precise power management.
Its high-performance features make it suitable for applications requiring reliability and efficiency.
Package
The UC3842BNG is a high-performance current-mode PWM controller typically packaged in an 8-pin dual in-line package (DIP-8) or surface-mount package such as SOIC-8.
