Specifications
| Attribute | Value |
| Package | Bulk,Tube |
| ProductStatus | Active |
| 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) | 7.6V ~ 30V |
| 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 UC2845BNG is a fixed-frequency, current-mode PWM (Pulse Width Modulation) controller designed for high-performance offline or DC-DC converter applications. It is part of the UC284x family of devices, which are well-known for their robust performance in power supply management. The UC2845BNG is ideal for applications requiring a reliable and efficient power control solution.
Key features of the UC2845BNG include precise oscillator frequency stability, high gain bandwidth error amplifier, current sense comparator, and a high current totem pole output for driving power MOSFETs. The device operates at a fixed frequency, significantly reducing design complexity and ensuring consistent performance.
The UC2845BNG also includes protection features such as undervoltage lockout (UVLO) to ensure the device operates only when the supply voltage is above a certain threshold, enhancing system reliability. Its low start-up and operating currents make it suitable for energy-efficient applications. Overall, the UC2845BNG is a versatile and reliable choice for various power supply designs.
Key features of the UC2845BNG include precise oscillator frequency stability, high gain bandwidth error amplifier, current sense comparator, and a high current totem pole output for driving power MOSFETs. The device operates at a fixed frequency, significantly reducing design complexity and ensuring consistent performance.
The UC2845BNG also includes protection features such as undervoltage lockout (UVLO) to ensure the device operates only when the supply voltage is above a certain threshold, enhancing system reliability. Its low start-up and operating currents make it suitable for energy-efficient applications. Overall, the UC2845BNG is a versatile and reliable choice for various power supply designs.
Equivalent
The UC2845BNG is a high-performance switch-mode power supply controller. Equivalent products include:
1. UC3845 - A similar PWM controller with minor variations in temperature range and other specs.
2. NCP2845 - An ON Semiconductor equivalent with similar functionality.
3. LM2845 - A Texas Instruments equivalent with comparable performance.
4. SG3845 - Another alternative with similar features.
Always verify specific parameters like temperature range and package type before substitution.
1. UC3845 - A similar PWM controller with minor variations in temperature range and other specs.
2. NCP2845 - An ON Semiconductor equivalent with similar functionality.
3. LM2845 - A Texas Instruments equivalent with comparable performance.
4. SG3845 - Another alternative with similar features.
Always verify specific parameters like temperature range and package type before substitution.
Features
The UC2845BNG is a high-performance current-mode PWM controller designed for power supply applications. Key features include:
1. High-Performance Current-Mode Controller: Provides precise output voltage regulation and fast transient response.
2. Operating Frequency: Capable of operating up to 500 kHz, which allows for smaller component sizes and improved transient response.
3. PWM Operation: Pulse Width Modulation (PWM) minimizes power loss and increases efficiency.
4. Undervoltage Lockout (UVLO): Ensures the device operates only when there is sufficient voltage, protecting it from low-voltage conditions.
5. Error Amplifier: High-gain error amplifier improves loop regulation.
6. Current Sense: Incorporates a current sense pin for cycle-by-cycle current limiting.
7. Soft Start Capability: Reduces stress on power components during startup.
8. Shutdown Feature: Lowers power consumption in standby mode.
9. Temperature Range: Typically operates within an extended temperature range for various environmental conditions.
These features make the UC2845BNG suitable for applications requiring high efficiency and reliable performance, such as in switch-mode power supplies and DC-DC converters.
1. High-Performance Current-Mode Controller: Provides precise output voltage regulation and fast transient response.
2. Operating Frequency: Capable of operating up to 500 kHz, which allows for smaller component sizes and improved transient response.
3. PWM Operation: Pulse Width Modulation (PWM) minimizes power loss and increases efficiency.
4. Undervoltage Lockout (UVLO): Ensures the device operates only when there is sufficient voltage, protecting it from low-voltage conditions.
5. Error Amplifier: High-gain error amplifier improves loop regulation.
6. Current Sense: Incorporates a current sense pin for cycle-by-cycle current limiting.
7. Soft Start Capability: Reduces stress on power components during startup.
8. Shutdown Feature: Lowers power consumption in standby mode.
9. Temperature Range: Typically operates within an extended temperature range for various environmental conditions.
These features make the UC2845BNG suitable for applications requiring high efficiency and reliable performance, such as in switch-mode power supplies and DC-DC converters.
Pinout
The UC2845BNG is a fixed-frequency, current-mode PWM (Pulse Width Modulation) controller typically used in switch-mode power supplies. It is an 8-pin integrated circuit. Here's a brief description of its pin functions:
1. Pin 1 (Compensation): This pin is used for compensating the feedback loop to stabilize the voltage regulation.
2. Pin 2 (Voltage Feedback): This pin receives the output voltage feedback signal for regulation.
3. Pin 3 (Current Sense): Used for sensing the current through the power switch, contributing to current-mode control.
4. Pin 4 (RT/CT): Connects to the timing resistor and capacitor that set the oscillator frequency.
5. Pin 5 (Ground): Ground reference for the IC.
6. Pin 6 (Output): The PWM output drive signal.
7. Pin 7 (VCC): The supply voltage input for the IC.
8. Pin 8 (VREF): Provides a stable 5V reference voltage for internal circuitry and can be used externally for system purposes.
This configuration allows the UC2845BNG to efficiently control the power supply output by adjusting the duty cycle of the PWM signal based on input feedback, current sensing, and an internal clock.
1. Pin 1 (Compensation): This pin is used for compensating the feedback loop to stabilize the voltage regulation.
2. Pin 2 (Voltage Feedback): This pin receives the output voltage feedback signal for regulation.
3. Pin 3 (Current Sense): Used for sensing the current through the power switch, contributing to current-mode control.
4. Pin 4 (RT/CT): Connects to the timing resistor and capacitor that set the oscillator frequency.
5. Pin 5 (Ground): Ground reference for the IC.
6. Pin 6 (Output): The PWM output drive signal.
7. Pin 7 (VCC): The supply voltage input for the IC.
8. Pin 8 (VREF): Provides a stable 5V reference voltage for internal circuitry and can be used externally for system purposes.
This configuration allows the UC2845BNG to efficiently control the power supply output by adjusting the duty cycle of the PWM signal based on input feedback, current sensing, and an internal clock.
Manufacturer
The UC2845BNG is manufactured by ON Semiconductor, a company that specializes in semiconductor manufacturing. ON Semiconductor, now known as onsemi, produces a wide range of semiconductor components used in various applications, including automotive, industrial, and consumer electronics. The company focuses on providing energy-efficient solutions and has a strong emphasis on power management, analog devices, sensors, and connectivity. As a major player in the semiconductor industry, onsemi is known for its innovation and extensive portfolio of products that support modern technology and energy-efficient solutions.
Application
The UC2845BNG is a versatile PWM (Pulse Width Modulation) controller primarily used in power supply management and regulation. Its key application areas include:
1. Switch-Mode Power Supplies (SMPS): Used in various electronics to improve efficiency.
2. DC-DC Converters: Converts DC voltage levels efficiently for different application requirements.
3. Battery Chargers: Manages charging cycles, enhancing battery life and performance.
4. Motor Control: Provides precise control over motor speeds in industrial and consumer applications.
5. LED Drivers: Used in driving LEDs with constant current for consistent brightness.
These applications leverage the UC2845BNG's capabilities in efficient power conversion and regulation.
1. Switch-Mode Power Supplies (SMPS): Used in various electronics to improve efficiency.
2. DC-DC Converters: Converts DC voltage levels efficiently for different application requirements.
3. Battery Chargers: Manages charging cycles, enhancing battery life and performance.
4. Motor Control: Provides precise control over motor speeds in industrial and consumer applications.
5. LED Drivers: Used in driving LEDs with constant current for consistent brightness.
These applications leverage the UC2845BNG's capabilities in efficient power conversion and regulation.
Package
The UC2845BNG is typically available in a DIP-8 (Dual In-line Package with 8 pins) package type. This package is suitable for through-hole mounting on printed circuit boards.
