規格
| 屬性 | 價值 |
| 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 | 0°C ~ 70°C (TA) |
| MountingType | Surface Mount |
| Package/Case | 8-SOIC (0.154, 3.90mm Width) |
概述
Description
The UC3845BD1R2G is a high-performance fixed-frequency current-mode PWM (Pulse Width Modulation) controller, commonly used in power electronics for DC-DC converters, off-line converters, and switch-mode power supplies. Manufactured by ON Semiconductor, this device is part of the UC384x series, known for its efficiency in regulating output voltage and managing power conversion.
Key features of the UC3845BD1R2G include:
- Current Mode Control: Provides superior line regulation and transient response.
- Fixed Operating Frequency: Typically around 100 kHz, with the capability of being adjusted via an external resistor or capacitor.
- Low Start-Up Current: Minimizes start-up circuitry power dissipation.
- High-Speed Performance: Fast 1.0 A peak current output for driving power MOSFETs or bipolar transistors.
- Undervoltage Lockout (UVLO): Ensures the device starts up correctly by preventing operation until the input voltage reaches a certain threshold.
These features make the UC3845BD1R2G suitable for applications requiring compact, efficient, and reliable power conversion solutions.
Key features of the UC3845BD1R2G include:
- Current Mode Control: Provides superior line regulation and transient response.
- Fixed Operating Frequency: Typically around 100 kHz, with the capability of being adjusted via an external resistor or capacitor.
- Low Start-Up Current: Minimizes start-up circuitry power dissipation.
- High-Speed Performance: Fast 1.0 A peak current output for driving power MOSFETs or bipolar transistors.
- Undervoltage Lockout (UVLO): Ensures the device starts up correctly by preventing operation until the input voltage reaches a certain threshold.
These features make the UC3845BD1R2G suitable for applications requiring compact, efficient, and reliable power conversion solutions.
Equivalent
The UC3845BD1R2G is a fixed-frequency PWM controller commonly used in DC-DC converters and switch-mode power supplies. Equivalent products include:
1. UC3845 from Texas Instruments
2. LM3845 from ON Semiconductor
3. MC34065 from ON Semiconductor
4. NCP3845 from ON Semiconductor
5. SG3845 from STMicroelectronics
These alternatives offer similar functionality with varying specifications, so checking datasheets for compatibility in your specific application is recommended.
1. UC3845 from Texas Instruments
2. LM3845 from ON Semiconductor
3. MC34065 from ON Semiconductor
4. NCP3845 from ON Semiconductor
5. SG3845 from STMicroelectronics
These alternatives offer similar functionality with varying specifications, so checking datasheets for compatibility in your specific application is recommended.
Features
The UC3845BD1R2G is a high-performance, fixed-frequency current mode PWM controller designed for power supply applications. It operates at a frequency of 500 kHz, making it suitable for high-density power supplies. Key features include:
1. Low Start-Up Current: It has a low start-up current, reducing power consumption during startup.
2. High Current Totem-Pole Output: Capable of driving MOSFETs or IGBTs directly, facilitating efficient switching.
3. Undervoltage Lockout (UVLO): Ensures that the device operates only under safe voltage conditions.
4. Optimized for Off-Line and DC-to-DC Converters: It’s ideal for use in off-line converters and DC-to-DC conversion applications.
5. Current Mode Operation: Provides inherent cycle-by-cycle current limiting, improving reliability and performance.
6. Trimmed Oscillator: Precise frequency control enhances stability.
7. PWM Latch for Single Pulse Per Period: Enhances output stability and control.
8. Adjustable Dead Time Control: Allows customization of the timing between switching actions to reduce power losses.
These features make the UC3845BD1R2G an efficient solution for various power supply designs.
1. Low Start-Up Current: It has a low start-up current, reducing power consumption during startup.
2. High Current Totem-Pole Output: Capable of driving MOSFETs or IGBTs directly, facilitating efficient switching.
3. Undervoltage Lockout (UVLO): Ensures that the device operates only under safe voltage conditions.
4. Optimized for Off-Line and DC-to-DC Converters: It’s ideal for use in off-line converters and DC-to-DC conversion applications.
5. Current Mode Operation: Provides inherent cycle-by-cycle current limiting, improving reliability and performance.
6. Trimmed Oscillator: Precise frequency control enhances stability.
7. PWM Latch for Single Pulse Per Period: Enhances output stability and control.
8. Adjustable Dead Time Control: Allows customization of the timing between switching actions to reduce power losses.
These features make the UC3845BD1R2G an efficient solution for various power supply designs.
Pinout
The UC3845BD1R2G is an integrated circuit commonly used as a high-performance, fixed-frequency current mode PWM controller for power supply applications. It typically comes in an 8-pin configuration. Here’s a brief overview of the pin functions:
1. Pin 1 (Compensation): This pin is used for frequency compensation.
2. Pin 2 (Voltage Feedback): This pin receives the voltage feedback from the output.
3. Pin 3 (Current Sense): It monitors the current via a resistor and is used for current limiting.
4. Pin 4 (RT/CT): This pin sets the oscillator frequency.
5. Pin 5 (Ground): Common ground for both the analog and power sections of the IC.
6. Pin 6 (Output): This pin drives the gate of an external switching transistor.
7. Pin 7 (VCC): Power supply voltage input for the IC.
8. Pin 8 (VREF): Provides a reference voltage output.
This IC is favored for its simplicity, reliability, and cost-effectiveness in applications like switch-mode power supplies, converters, and other power management applications.
1. Pin 1 (Compensation): This pin is used for frequency compensation.
2. Pin 2 (Voltage Feedback): This pin receives the voltage feedback from the output.
3. Pin 3 (Current Sense): It monitors the current via a resistor and is used for current limiting.
4. Pin 4 (RT/CT): This pin sets the oscillator frequency.
5. Pin 5 (Ground): Common ground for both the analog and power sections of the IC.
6. Pin 6 (Output): This pin drives the gate of an external switching transistor.
7. Pin 7 (VCC): Power supply voltage input for the IC.
8. Pin 8 (VREF): Provides a reference voltage output.
This IC is favored for its simplicity, reliability, and cost-effectiveness in applications like switch-mode power supplies, converters, and other power management applications.
Manufacturer
The UC3845BD1R2G is manufactured by ON Semiconductor, now known as onsemi. onsemi is a leading supplier of semiconductor-based solutions, offering a comprehensive portfolio of energy-efficient power and signal management, logic, standard, and custom devices. The company serves a variety of markets, including automotive, communications, computing, consumer electronics, industrial, medical, and military/aerospace. onsemi is known for its innovative approach to developing high-performance, energy-efficient products to meet the evolving needs of these industries, playing a crucial role in the advancement of smart technology and sustainable solutions.
Application
The UC3845BD1R2G is a high-performance current-mode PWM controller primarily used in various power supply applications. Its application areas include:
1. Switched-Mode Power Supplies (SMPS): Used for efficient power conversion in consumer electronics, computers, and communication devices.
2. DC-DC Converters: Suitable for step-up (boost), step-down (buck), and other converter types in automotive and industrial systems.
3. Battery Chargers: Provides control in battery management systems for efficient charging.
4. LED Drivers: Powers LED circuits in lighting applications.
5. Uninterruptible Power Supplies (UPS): Ensures power backup and management.
6. Power Management Systems: Used in renewable energy systems and smart grids for efficient power handling.
Its high-speed operation and current-mode control make it versatile for numerous applications requiring efficient power management.
1. Switched-Mode Power Supplies (SMPS): Used for efficient power conversion in consumer electronics, computers, and communication devices.
2. DC-DC Converters: Suitable for step-up (boost), step-down (buck), and other converter types in automotive and industrial systems.
3. Battery Chargers: Provides control in battery management systems for efficient charging.
4. LED Drivers: Powers LED circuits in lighting applications.
5. Uninterruptible Power Supplies (UPS): Ensures power backup and management.
6. Power Management Systems: Used in renewable energy systems and smart grids for efficient power handling.
Its high-speed operation and current-mode control make it versatile for numerous applications requiring efficient power management.
Package
The UC3845BD1R2G is typically available in a SOIC-8 package, which is a small outline integrated circuit with 8 pins. This package type is commonly used for surface-mount technology (SMT) applications.
