Specifications
| Attribute | Value |
| Package | Tube,Tube |
| ProductStatus | Obsolete |
| OutputType | Transistor Driver |
| Function | Step-Up, Step-Up/Step-Down |
| OutputConfiguration | Positive, Isolation Capable |
| Topology | Boost, Flyback |
| NumberofOutputs | 1 |
| OutputPhases | 1 |
| Voltage-Supply(Vcc/Vdd) | 10V ~ 30V |
| Frequency-Switching | Up to 500kHz |
| DutyCycle(Max) | 96% |
| SynchronousRectifier | No |
| ClockSync | No |
| ControlFeatures | Frequency Control |
| OperatingTemperature | 0°C ~ 70°C (TA) |
| MountingType | Through Hole |
| Package/Case | 8-DIP (0.300, 7.62mm) |
Overview
Description
The UC3842BN is a popular integrated circuit designed for use in switch-mode power supplies and converters. It is part of the UC384x family, which is known for its high-performance, low-cost, and efficient operation. The UC3842BN specifically functions as a current-mode PWM (Pulse Width Modulation) controller, which helps regulate the output voltage and improve the overall efficiency of power supply designs.
Key features of the UC3842BN include:
1. Current-Mode Control: Provides superior load and line regulation.
2. High Performance: Offers fast response times and high-speed operation.
3. Low Start-Up Current: Reduces power consumption during startup.
4. Wide Operating Range: Operates over a wide voltage range, which allows versatility in different applications.
5. Undervoltage Lockout: Ensures the IC operates only when the supply voltage is sufficient.
6. Internal Oscillator: Provides a stable frequency for PWM operations.
7. Output Drive Capability: Suitable for driving power MOSFETs or IGBTs directly.
The UC3842BN is commonly used in applications like AC/DC converters, battery chargers, and other power management systems.
Key features of the UC3842BN include:
1. Current-Mode Control: Provides superior load and line regulation.
2. High Performance: Offers fast response times and high-speed operation.
3. Low Start-Up Current: Reduces power consumption during startup.
4. Wide Operating Range: Operates over a wide voltage range, which allows versatility in different applications.
5. Undervoltage Lockout: Ensures the IC operates only when the supply voltage is sufficient.
6. Internal Oscillator: Provides a stable frequency for PWM operations.
7. Output Drive Capability: Suitable for driving power MOSFETs or IGBTs directly.
The UC3842BN is commonly used in applications like AC/DC converters, battery chargers, and other power management systems.
Equivalent
The UC3842BN is a current-mode PWM controller often used in switch-mode power supplies. Equivalent products include the TL3842, LM3842, NCP3842, KA3842, and SG3842. These alternatives generally offer similar functionality and are pin-compatible, making them suitable substitutes in most applications. Always check the datasheets for any variations in electrical characteristics or performance.
Features
The UC3842BN is a current-mode PWM (Pulse Width Modulation) controller designed for off-line and DC-to-DC converter applications. Key features include:
1. Current Mode Operation: Provides improved performance for power supply design, ensuring stability and fast response.
2. High-Speed Oscillator: Capable of operation up to 500 kHz, allowing for flexibility in frequency selection and design.
3. Precision Reference: Includes a precise 5V reference for stable output regulation.
4. Error Amplifier: Features a high-performance error amplifier with low input offset voltage, enhancing accuracy.
5. Undervoltage Lockout (UVLO): Ensures safe startup and shutdown by preventing operation below specific voltage levels.
6. Output Transistor: The totem-pole output stage can source or sink up to 1A, suitable for driving power MOSFETs.
7. Low Startup Current: Minimizes power consumption during startup, enhancing efficiency.
8. Protection Features: Includes current limiting and thermal shutdown to protect against overload and overheating conditions.
These features make the UC3842BN suitable for various power supply applications, providing reliability and efficiency.
1. Current Mode Operation: Provides improved performance for power supply design, ensuring stability and fast response.
2. High-Speed Oscillator: Capable of operation up to 500 kHz, allowing for flexibility in frequency selection and design.
3. Precision Reference: Includes a precise 5V reference for stable output regulation.
4. Error Amplifier: Features a high-performance error amplifier with low input offset voltage, enhancing accuracy.
5. Undervoltage Lockout (UVLO): Ensures safe startup and shutdown by preventing operation below specific voltage levels.
6. Output Transistor: The totem-pole output stage can source or sink up to 1A, suitable for driving power MOSFETs.
7. Low Startup Current: Minimizes power consumption during startup, enhancing efficiency.
8. Protection Features: Includes current limiting and thermal shutdown to protect against overload and overheating conditions.
These features make the UC3842BN suitable for various power supply applications, providing reliability and efficiency.
Pinout
The UC3842BN is a high-performance fixed-frequency current-mode PWM controller. It is commonly used in power supply and power conversion applications. The UC3842BN is an 8-pin device, and the function of each pin is as follows:
1. Compensation (COMP): This pin is used for frequency compensation. It is connected to the output of the error amplifier and is typically used to stabilize the control loop.
2. Voltage Feedback (VFB): This pin receives the feedback voltage from the output to regulate the power supply's output voltage.
3. Current Sense (ISEN): This pin is used for current sensing. It monitors the current flowing through the power switch and provides cycle-by-cycle current limiting.
4. RT/CT: This pin sets the oscillator frequency using an external resistor and capacitor.
5. Ground (GND): This pin is connected to the ground reference of the IC.
6. Output (OUT): This is the output pin that drives the gate of an external power MOSFET or transistor.
7. VCC: This pin supplies power to the IC. The typical operating voltage is between 12V and 25V.
8. VREF: This pin provides a 5V reference voltage output, used for precise voltage regulation and other internal operations.
These pins work together to provide efficient control over power switching devices.
1. Compensation (COMP): This pin is used for frequency compensation. It is connected to the output of the error amplifier and is typically used to stabilize the control loop.
2. Voltage Feedback (VFB): This pin receives the feedback voltage from the output to regulate the power supply's output voltage.
3. Current Sense (ISEN): This pin is used for current sensing. It monitors the current flowing through the power switch and provides cycle-by-cycle current limiting.
4. RT/CT: This pin sets the oscillator frequency using an external resistor and capacitor.
5. Ground (GND): This pin is connected to the ground reference of the IC.
6. Output (OUT): This is the output pin that drives the gate of an external power MOSFET or transistor.
7. VCC: This pin supplies power to the IC. The typical operating voltage is between 12V and 25V.
8. VREF: This pin provides a 5V reference voltage output, used for precise voltage regulation and other internal operations.
These pins work together to provide efficient control over power switching devices.
Manufacturer
The UC3842BN is manufactured by Texas Instruments, a leading global semiconductor company. Texas Instruments designs and produces a wide range of semiconductor products, including integrated circuits and microcontrollers, used in various applications across different industries such as consumer electronics, automotive, industrial equipment, and telecommunications. Known for its innovation and reliability, Texas Instruments focuses on developing analog and embedded processing technologies to enable efficient digital signal processing and power management solutions. The company emphasizes sustainability and is committed to advancing technology that helps improve energy efficiency and performance in electronic devices.
Application
The UC3842BN is a versatile current mode PWM controller used primarily in power electronics. Key application areas include:
1. Switched-Mode Power Supplies (SMPS): Utilized in designing efficient power supplies for electronic devices.
2. DC-DC Converters: Enables step-up or step-down voltage conversion with high efficiency.
3. Battery Chargers: Ensures effective and safe charging cycles for various battery types.
4. Motor Control: Provides precise control in variable speed motor applications.
5. Lighting Ballasts: Used in controlling the power supply to lighting systems.
6. Telecommunications Equipment: For power regulation and management.
These applications benefit from UC3842BN's high performance, stability, and efficiency in managing power conversion tasks.
1. Switched-Mode Power Supplies (SMPS): Utilized in designing efficient power supplies for electronic devices.
2. DC-DC Converters: Enables step-up or step-down voltage conversion with high efficiency.
3. Battery Chargers: Ensures effective and safe charging cycles for various battery types.
4. Motor Control: Provides precise control in variable speed motor applications.
5. Lighting Ballasts: Used in controlling the power supply to lighting systems.
6. Telecommunications Equipment: For power regulation and management.
These applications benefit from UC3842BN's high performance, stability, and efficiency in managing power conversion tasks.
Package
The UC3842BN is a high-performance current-mode PWM controller commonly used in power supply applications. It comes in an 8-pin Dual In-line Package (DIP), which is suitable for through-hole mounting.
