Спецификации
| Атрибут | Ценность |
| Package | Tape & Reel (TR),Cut Tape (CT),Bulk |
| 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 | Surface Mount |
| Package/Case | 8-SOIC (0.154, 3.90mm Width) |
Обзор
Description
The UC2845BD1R2G is a high-performance fixed-frequency current-mode PWM (Pulse Width Modulation) controller designed for power-supply applications. It is part of the UC2845B series, primarily used for efficient voltage regulation in switching power supplies. This integrated circuit (IC) is manufactured by ON Semiconductor and is known for its reliable performance in various power management applications.
Key features include a wide operating voltage range, low start-up current, and high-speed operation, which contribute to its efficiency in managing power conversion. The UC2845BD1R2G offers enhanced control with its built-in current limiting, under-voltage lockout, and short-circuit protection, making it suitable for robust and reliable power solutions. The device operates typically at a fixed frequency of 100 kHz, providing stable and consistent output.
Applications include AC/DC converters, DC/DC converters, and other switch-mode power supplies where precise control and efficiency are required. Its compact form factor and integrated functions help simplify design, reduce component count, and enhance overall system reliability.
Key features include a wide operating voltage range, low start-up current, and high-speed operation, which contribute to its efficiency in managing power conversion. The UC2845BD1R2G offers enhanced control with its built-in current limiting, under-voltage lockout, and short-circuit protection, making it suitable for robust and reliable power solutions. The device operates typically at a fixed frequency of 100 kHz, providing stable and consistent output.
Applications include AC/DC converters, DC/DC converters, and other switch-mode power supplies where precise control and efficiency are required. Its compact form factor and integrated functions help simplify design, reduce component count, and enhance overall system reliability.
Equivalent
The UC2845BD1R2G is a current-mode PWM controller. Equivalent products include the following:
1. UC2845 (TI)
2. UC3845 (On Semiconductor / TI)
3. MC2845 (Motorola)
4. NCP2845 (On Semiconductor)
5. KA3845 (Fairchild)
These components have similar functionalities and are used in power supply and regulation applications. Always check datasheets for specific compatibility.
1. UC2845 (TI)
2. UC3845 (On Semiconductor / TI)
3. MC2845 (Motorola)
4. NCP2845 (On Semiconductor)
5. KA3845 (Fairchild)
These components have similar functionalities and are used in power supply and regulation applications. Always check datasheets for specific compatibility.
Features
The UC2845BD1R2G is a fixed-frequency current-mode PWM controller IC designed for efficient power supply management. Key features include:
1. Current-Mode Control: Provides accurate output regulation and simplifies loop compensation.
2. Fixed-Frequency Operation: Ensures consistent performance, typically operating at a frequency set by external components.
3. Wide Input Voltage Range: Can accommodate various power supply configurations.
4. Undervoltage Lockout (UVLO): Prevents the IC from operating below a certain voltage threshold to ensure stability.
5. Low Start-Up Current: Minimizes power consumption during initialization.
6. High-Current Totem Pole Output: Capable of driving power MOSFETs efficiently.
7. Built-In Soft Start: Gradually increases the duty cycle to reduce current spikes and electromagnetic interference during power-up.
8. Error Amplifier: Provides precise control over output voltage.
9. Programmable Oscillator: Allows customization of operation frequency via external resistors and capacitors.
10. Protection Features: Includes overcurrent protection to safeguard against excessive loads or faults.
These features make the UC2845BD1R2G suitable for various switching power supply applications, including DC-DC converters and off-line power supplies.
1. Current-Mode Control: Provides accurate output regulation and simplifies loop compensation.
2. Fixed-Frequency Operation: Ensures consistent performance, typically operating at a frequency set by external components.
3. Wide Input Voltage Range: Can accommodate various power supply configurations.
4. Undervoltage Lockout (UVLO): Prevents the IC from operating below a certain voltage threshold to ensure stability.
5. Low Start-Up Current: Minimizes power consumption during initialization.
6. High-Current Totem Pole Output: Capable of driving power MOSFETs efficiently.
7. Built-In Soft Start: Gradually increases the duty cycle to reduce current spikes and electromagnetic interference during power-up.
8. Error Amplifier: Provides precise control over output voltage.
9. Programmable Oscillator: Allows customization of operation frequency via external resistors and capacitors.
10. Protection Features: Includes overcurrent protection to safeguard against excessive loads or faults.
These features make the UC2845BD1R2G suitable for various switching power supply applications, including DC-DC converters and off-line power supplies.
Pinout
The UC2845BD1R2G is an integrated circuit designed for use in switch-mode power supplies and other power control applications. It is a high-performance current-mode controller. This IC typically comes in an 8-pin package. Here is a brief overview of its pin functions:
1. Pin 1 (Compensation): This pin is used for compensation and stability of the control loop.
2. Pin 2 (Voltage Feedback): It receives the voltage feedback from the output for regulation.
3. Pin 3 (Current Sense): It monitors the current in the switch for current-mode control.
4. Pin 4 (RT/CT): Sets the oscillator frequency by connecting a timing resistor and capacitor.
5. Pin 5 (GND): Ground reference for the IC.
6. Pin 6 (Output): Drives the gate of an external MOSFET or transistor.
7. Pin 7 (VCC): The power supply pin for the IC.
8. Pin 8 (VREF): Provides a reference voltage for internal circuitry.
This pin configuration supports the IC’s functionality in controlling power supply outputs with high efficiency and precision.
1. Pin 1 (Compensation): This pin is used for compensation and stability of the control loop.
2. Pin 2 (Voltage Feedback): It receives the voltage feedback from the output for regulation.
3. Pin 3 (Current Sense): It monitors the current in the switch for current-mode control.
4. Pin 4 (RT/CT): Sets the oscillator frequency by connecting a timing resistor and capacitor.
5. Pin 5 (GND): Ground reference for the IC.
6. Pin 6 (Output): Drives the gate of an external MOSFET or transistor.
7. Pin 7 (VCC): The power supply pin for the IC.
8. Pin 8 (VREF): Provides a reference voltage for internal circuitry.
This pin configuration supports the IC’s functionality in controlling power supply outputs with high efficiency and precision.
Manufacturer
The UC2845BD1R2G is manufactured by ON Semiconductor, which is now known as onsemi. Onsemi is a semiconductor supplier company that focuses on intelligent technology solutions, including power management, analog, sensors, logic, timing, connectivity, discrete, SoC, and custom devices. The company is known for providing high-performance, energy-efficient silicon solutions for various sectors, including automotive, industrial, cloud power, and IoT, among others.
Application
The UC2845BD1R2G is a fixed-frequency PWM (Pulse Width Modulation) controller used primarily in power supply applications. It is commonly applied in DC-DC converters, off-line power supplies, and switching power supplies. This IC is suitable for applications requiring efficient power conversion, such as battery chargers, LED drivers, and industrial power management systems. Its features, including current mode control, adjustable frequency, and high-speed operation, make it ideal for applications needing precise power regulation and efficient energy usage in both commercial and consumer electronics.
Package
The UC2845BD1R2G is available in a SOIC-8 package type. This is an 8-pin surface-mounted package commonly used for integrated circuits, providing a compact and reliable form factor.
