仕様
| 属性 | 値 |
| Package | Tape & Reel (TR),Cut Tape (CT) |
| 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) | 10V ~ 36V |
| 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 | 14-SOIC (0.154, 3.90mm Width) |
概要
Description
The UC3844BDR2G is a high-performance, fixed-frequency, current-mode PWM (pulse width modulation) controller designed primarily for off-line and DC-to-DC converter applications. It is part of the UC384x family, known for its ability to improve performance and efficiency in power supply designs.
Key features of the UC3844BDR2G include a trimmed oscillator for precise frequency control, typically running at 500 kHz, and a current-mode operation that offers superior load regulation, line regulation, and simplified loop compensation. It also incorporates a low start-up current, ensuring efficient startup performance, and a high output drive capable of driving power MOSFETs directly.
The device includes built-in protection features like under-voltage lockout (UVLO) to protect against low supply voltages, and short-circuit protection, enhancing system reliability. The UC3844BDR2G is housed in a standard SOIC-8 package and operates over a wide temperature range, making it suitable for various industrial and consumer applications. It is widely used in power supplies for computers, telecommunications, and industrial equipment.
Key features of the UC3844BDR2G include a trimmed oscillator for precise frequency control, typically running at 500 kHz, and a current-mode operation that offers superior load regulation, line regulation, and simplified loop compensation. It also incorporates a low start-up current, ensuring efficient startup performance, and a high output drive capable of driving power MOSFETs directly.
The device includes built-in protection features like under-voltage lockout (UVLO) to protect against low supply voltages, and short-circuit protection, enhancing system reliability. The UC3844BDR2G is housed in a standard SOIC-8 package and operates over a wide temperature range, making it suitable for various industrial and consumer applications. It is widely used in power supplies for computers, telecommunications, and industrial equipment.
Equivalent
The UC3844BDR2G is a current-mode PWM controller. Equivalent or similar products include:
1. TI UC3844
2. ON Semiconductor NCP3843
3. Fairchild KA3844
4. STMicroelectronics UC3845
5. Microchip MIC38C44
These chips share functionality and applications but may vary in specifications like package type or temperature range, so always verify compatibility with your specific requirements.
1. TI UC3844
2. ON Semiconductor NCP3843
3. Fairchild KA3844
4. STMicroelectronics UC3845
5. Microchip MIC38C44
These chips share functionality and applications but may vary in specifications like package type or temperature range, so always verify compatibility with your specific requirements.
Features
The UC3844BDR2G is a high-performance, fixed-frequency current-mode PWM controller designed for offline and DC-to-DC converter applications. Key features include:
1. Current Mode Control: Allows for simple output regulation and improved transient response.
2. Fixed Operating Frequency: Typically 52 kHz, providing predictable performance.
3. Low Start-up and Operating Current: Reduces standby power consumption.
4. Undervoltage Lockout (UVLO): Ensures the device operates only when the input voltage is above a certain threshold, improving reliability.
5. Leading-Edge Blanking: Reduces noise sensitivity and avoids premature triggering.
6. High-Current Totem Pole Output: Drives large power MOSFETs directly.
7. Built-in Soft Start: Limits inrush current during startup.
8. Adjustable Dead Time Control: Offers optimization for various external components and applications.
9. Wide Operating Temperature Range: Typically -40°C to +105°C, suitable for industrial environments.
These features make the UC3844BDR2G an excellent choice for efficient and reliable power supply designs.
1. Current Mode Control: Allows for simple output regulation and improved transient response.
2. Fixed Operating Frequency: Typically 52 kHz, providing predictable performance.
3. Low Start-up and Operating Current: Reduces standby power consumption.
4. Undervoltage Lockout (UVLO): Ensures the device operates only when the input voltage is above a certain threshold, improving reliability.
5. Leading-Edge Blanking: Reduces noise sensitivity and avoids premature triggering.
6. High-Current Totem Pole Output: Drives large power MOSFETs directly.
7. Built-in Soft Start: Limits inrush current during startup.
8. Adjustable Dead Time Control: Offers optimization for various external components and applications.
9. Wide Operating Temperature Range: Typically -40°C to +105°C, suitable for industrial environments.
These features make the UC3844BDR2G an excellent choice for efficient and reliable power supply designs.
Pinout
The UC3844BDR2G is a high-performance current mode controller primarily used for off-line and DC-to-DC converter applications. It typically comes in an 8-pin package. Here’s a brief overview of its pin functions:
1. Pin 1 (COMP): Compensation - Used to compensate the control loop and stabilize the system.
2. Pin 2 (VFB): Voltage Feedback - Receives voltage feedback from the output to regulate output voltage.
3. Pin 3 (CS): Current Sense - Inputs current sense signal for current mode control and protection.
4. Pin 4 (RT/CT): Oscillator Timing Resistor/Capacitor - Sets the oscillator frequency.
5. Pin 5 (GND): Ground - Common ground reference for the IC.
6. Pin 6 (Output): Output - Drives the gate of an external power MOSFET or transistor.
7. Pin 7 (VCC): Supply Voltage - Powers the IC.
8. Pin 8 (VREF): Reference Voltage - Provides a stable 5V reference voltage for the IC and external circuitry.
The UC3844BDR2G is designed for high-speed switching power supplies with its robust performance and precise regulation capabilities.
1. Pin 1 (COMP): Compensation - Used to compensate the control loop and stabilize the system.
2. Pin 2 (VFB): Voltage Feedback - Receives voltage feedback from the output to regulate output voltage.
3. Pin 3 (CS): Current Sense - Inputs current sense signal for current mode control and protection.
4. Pin 4 (RT/CT): Oscillator Timing Resistor/Capacitor - Sets the oscillator frequency.
5. Pin 5 (GND): Ground - Common ground reference for the IC.
6. Pin 6 (Output): Output - Drives the gate of an external power MOSFET or transistor.
7. Pin 7 (VCC): Supply Voltage - Powers the IC.
8. Pin 8 (VREF): Reference Voltage - Provides a stable 5V reference voltage for the IC and external circuitry.
The UC3844BDR2G is designed for high-speed switching power supplies with its robust performance and precise regulation capabilities.
Manufacturer
The UC3844BDR2G is manufactured by ON Semiconductor. ON Semiconductor, now known as onsemi, is a semiconductor supplier company that designs and manufactures a wide range of semiconductor components. The company specializes in power and signal management, logic, discrete, and custom devices for various industries, including automotive, communications, computing, consumer electronics, industrial, medical, and aerospace. onsemi is known for providing products that help manage power efficiently and enhance energy savings, making them a key player in the development of smart technology solutions.
Application
The UC3844BDR2G is a high-performance fixed-frequency current-mode PWM controller commonly used in power supply applications. Key application areas include:
1. Switching Power Supplies: Used in SMPS for efficient power conversion.
2. DC-DC Converters: Suitable for stepping up or stepping down voltage levels.
3. Motor Control: Utilized in controlling small motors by managing power delivery.
4. Battery Chargers: Employed in charging systems to manage power flow efficiently.
5. Industrial Systems: Integrated into industrial control systems for reliable power management.
Its ability to provide precise control over power delivery makes it suitable for various consumer electronics and telecommunications applications.
1. Switching Power Supplies: Used in SMPS for efficient power conversion.
2. DC-DC Converters: Suitable for stepping up or stepping down voltage levels.
3. Motor Control: Utilized in controlling small motors by managing power delivery.
4. Battery Chargers: Employed in charging systems to manage power flow efficiently.
5. Industrial Systems: Integrated into industrial control systems for reliable power management.
Its ability to provide precise control over power delivery makes it suitable for various consumer electronics and telecommunications applications.
Package
The UC3844BDR2G is typically available in a SOIC-8 package. This is a surface-mount package type that features 8 pins and is commonly used for integrated circuits requiring compact and efficient layouts.
