Specifications
| Attribute | Value |
| Package | 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 ~ 36V |
| Frequency-Switching | Up to 500kHz |
| DutyCycle(Max) | 48% |
| SynchronousRectifier | No |
| ClockSync | No |
| ControlFeatures | Frequency Control |
| OperatingTemperature | -25°C ~ 85°C (TA) |
| MountingType | Through Hole |
| Package/Case | 8-DIP (0.300, 7.62mm) |
Overview
Description
The UC2844BN is a monolithic integrated circuit that belongs to the UC284x series of current-mode PWM (Pulse Width Modulation) controllers. It is primarily used in switch-mode power supplies and DC-DC converters. The device is designed to offer high performance with fewer external components, thus simplifying the design process and reducing overall system costs.
Key features of the UC2844BN include a wide input voltage range, low start-up and operating currents, and a high-frequency oscillator with adjustable frequency. It also boasts built-in protection features such as under-voltage lockout, current limiting, and thermal shutdown to enhance reliability and safety.
The UC2844BN operates by comparing the input voltage to a reference signal, thereby regulating output voltage and current. Its robust performance makes it ideal for various applications, including power adapters, battery chargers, and industrial power supplies. The device is packaged in a standard 8-pin DIP (Dual Inline Package), making it compatible with a wide range of circuit boards.
Key features of the UC2844BN include a wide input voltage range, low start-up and operating currents, and a high-frequency oscillator with adjustable frequency. It also boasts built-in protection features such as under-voltage lockout, current limiting, and thermal shutdown to enhance reliability and safety.
The UC2844BN operates by comparing the input voltage to a reference signal, thereby regulating output voltage and current. Its robust performance makes it ideal for various applications, including power adapters, battery chargers, and industrial power supplies. The device is packaged in a standard 8-pin DIP (Dual Inline Package), making it compatible with a wide range of circuit boards.
Equivalent
The UC2844BN is a PWM controller commonly used in switching power supplies. Equivalent products include:
1. UC3842N/UC3843N/UC3844N/UC3845N by Texas Instruments
2. MC2842/MC2843/MC2844/MC2845 by ON Semiconductor
3. FAN7554 by Fairchild Semiconductor
4. NCP1200 Series by ON Semiconductor
These alternatives offer similar functionality and pin configurations, making them suitable replacements in many applications. Always verify the specific requirements of your circuit before substituting components.
1. UC3842N/UC3843N/UC3844N/UC3845N by Texas Instruments
2. MC2842/MC2843/MC2844/MC2845 by ON Semiconductor
3. FAN7554 by Fairchild Semiconductor
4. NCP1200 Series by ON Semiconductor
These alternatives offer similar functionality and pin configurations, making them suitable replacements in many applications. Always verify the specific requirements of your circuit before substituting components.
Features
The UC2844BN is a current-mode PWM (Pulse Width Modulation) controller primarily used in switch-mode power supplies and other power control applications. Here are its key features:
1. Current-Mode Control: Offers superior performance in regulation and transient response.
2. Oscillator: Programmable oscillator frequency up to 500 kHz, enabling flexibility in design.
3. Output: Totem-pole output stage ensures fast switching and can directly drive external power MOSFETs.
4. Undervoltage Lockout (UVLO): Ensures the device operates only within a safe voltage range, preventing erratic behavior.
5. Soft Start: Reduces inrush current during startup, enhancing reliability and longevity of components.
6. Low Standby Current: Designed for low power consumption, making it efficient in standby modes.
7. Overcurrent Protection: Protects the system by limiting current in overload conditions.
8. Error Amplifier: High-gain error amplifier for precise voltage regulation.
These features make the UC2844BN a versatile and reliable choice for designers working on efficient and robust power supply systems.
1. Current-Mode Control: Offers superior performance in regulation and transient response.
2. Oscillator: Programmable oscillator frequency up to 500 kHz, enabling flexibility in design.
3. Output: Totem-pole output stage ensures fast switching and can directly drive external power MOSFETs.
4. Undervoltage Lockout (UVLO): Ensures the device operates only within a safe voltage range, preventing erratic behavior.
5. Soft Start: Reduces inrush current during startup, enhancing reliability and longevity of components.
6. Low Standby Current: Designed for low power consumption, making it efficient in standby modes.
7. Overcurrent Protection: Protects the system by limiting current in overload conditions.
8. Error Amplifier: High-gain error amplifier for precise voltage regulation.
These features make the UC2844BN a versatile and reliable choice for designers working on efficient and robust power supply systems.
Pinout
The UC2844BN is a fixed-frequency current-mode PWM controller typically used in power supply applications. It comes in an 8-pin package, and its pin functions are as follows:
1. Compensation (COMP): Connects to the error amplifier output, used to stabilize the control loop.
2. Voltage Feedback (VFB): The inverting input of the error amplifier. It is typically connected to a voltage divider from the output.
3. Current Sense (CS): Monitors the current through the inductor and provides input for current limiting.
4. RT/CT: Sets the oscillator frequency with an external resistor and capacitor.
5. Ground (GND): The ground reference for the IC.
6. Output (OUT): Provides PWM output to drive the gate of an external MOSFET or other switching devices.
7. VCC: The supply voltage for the IC.
8. VREF: Provides a reference voltage output, typically used for internal and external circuits.
These pins work together to regulate the output voltage of a power supply by modulating the duty cycle of the PWM signal based on feedback and current sensing inputs.
1. Compensation (COMP): Connects to the error amplifier output, used to stabilize the control loop.
2. Voltage Feedback (VFB): The inverting input of the error amplifier. It is typically connected to a voltage divider from the output.
3. Current Sense (CS): Monitors the current through the inductor and provides input for current limiting.
4. RT/CT: Sets the oscillator frequency with an external resistor and capacitor.
5. Ground (GND): The ground reference for the IC.
6. Output (OUT): Provides PWM output to drive the gate of an external MOSFET or other switching devices.
7. VCC: The supply voltage for the IC.
8. VREF: Provides a reference voltage output, typically used for internal and external circuits.
These pins work together to regulate the output voltage of a power supply by modulating the duty cycle of the PWM signal based on feedback and current sensing inputs.
Manufacturer
The UC2844BN is manufactured by Texas Instruments (TI). Texas Instruments is a global company known for designing and manufacturing semiconductors and various integrated circuits. It serves a wide range of sectors, including automotive, industrial, personal electronics, communications equipment, and enterprise systems.
TI is a key player in the electronics industry, focusing on innovation in analog and embedded processing technologies. Their products are used in a variety of applications, from consumer devices to industrial automation and control systems. TI is recognized for its role in advancing the electronics industry through continuous research and development, leading to improved performance and efficiency in electronic components.
TI is a key player in the electronics industry, focusing on innovation in analog and embedded processing technologies. Their products are used in a variety of applications, from consumer devices to industrial automation and control systems. TI is recognized for its role in advancing the electronics industry through continuous research and development, leading to improved performance and efficiency in electronic components.
Application
The UC2844BN is a current-mode PWM controller commonly used in various power supply applications. It is suitable for designing off-line and DC-DC converter circuits. Key application areas include:
1. Switching Power Supplies: Ideal for building efficient AC-DC and DC-DC converters.
2. Battery Chargers: Used in both industrial and consumer battery charging systems.
3. Motor Controllers: Employed in controlling and driving small motors.
4. LED Drivers: Suitable for use in LED lighting applications for power regulation.
5. Telecommunications: Applied in power supplies for telecom infrastructure.
6. Industrial Power Systems: Used for control and regulation in various industrial power systems.
These applications leverage the UC2844BN's efficiency and reliability in controlling power conversion.
1. Switching Power Supplies: Ideal for building efficient AC-DC and DC-DC converters.
2. Battery Chargers: Used in both industrial and consumer battery charging systems.
3. Motor Controllers: Employed in controlling and driving small motors.
4. LED Drivers: Suitable for use in LED lighting applications for power regulation.
5. Telecommunications: Applied in power supplies for telecom infrastructure.
6. Industrial Power Systems: Used for control and regulation in various industrial power systems.
These applications leverage the UC2844BN's efficiency and reliability in controlling power conversion.
Package
The UC2844BN is typically available in a standard 8-pin Dual In-line Package (DIP-8). This package type is commonly used for through-hole mounting on printed circuit boards.
