仕様
| 属性 | 値 |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Part Status | Active |
| Output Isolation | Isolated |
| Internal Switch(s) | No |
| Topology | Flyback |
| Voltage - Start Up | 18 V |
| Voltage - Supply (Vcc/Vdd) | 8.8V ~ 28V |
| Duty Cycle | 80% |
| Frequency - Switching | 65kHz |
| Fault Protection | Over Power, Over Voltage, Short Circuit |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Supplier Device Package | 6-TSOP |
概要
Description
The NCP1251BSN65T1G is a product from ON Semiconductor designed for use in compact, high-efficiency power supplies. It is a fixed-frequency, current-mode controller tailored for flyback topologies, often used in isolated power supplies. One of its key features is the ability to operate in a low standby power mode, which is critical for meeting energy efficiency standards in modern electronic devices.
This controller offers a variety of protective functions, such as overcurrent protection, overvoltage protection, and thermal shutdown, enhancing the reliability and safety of the power supply. It also includes internal frequency jittering, which helps reduce electromagnetic interference (EMI) levels.
The NCP1251BSN65T1G operates efficiently across a wide input voltage range, making it suitable for universal input applications. Its compact design allows it to be used in space-constrained environments, providing a balance of performance and efficiency. This makes it particularly useful in consumer electronics, adapters, and other applications where size and efficiency are priorities.
This controller offers a variety of protective functions, such as overcurrent protection, overvoltage protection, and thermal shutdown, enhancing the reliability and safety of the power supply. It also includes internal frequency jittering, which helps reduce electromagnetic interference (EMI) levels.
The NCP1251BSN65T1G operates efficiently across a wide input voltage range, making it suitable for universal input applications. Its compact design allows it to be used in space-constrained environments, providing a balance of performance and efficiency. This makes it particularly useful in consumer electronics, adapters, and other applications where size and efficiency are priorities.
Equivalent
The NCP1251BSN65T1G is a PWM controller commonly used in switch-mode power supplies. Equivalent products may include:
1. UC3842 series
2. MC34063 series
3. TL494
4. FAN6754
These parts offer similar functionalities and can be considered for use in similar applications, although specific features and performance may vary. Always check data sheets for compatibility.
1. UC3842 series
2. MC34063 series
3. TL494
4. FAN6754
These parts offer similar functionalities and can be considered for use in similar applications, although specific features and performance may vary. Always check data sheets for compatibility.
Features
The NCP1251BSN65T1G is a fixed-frequency current-mode controller optimized for flyback configurations, often used in switch-mode power supplies. Key features include:
1. Low Startup Current: This helps in reducing standby power consumption, enhancing efficiency in low-load conditions.
2. Adjustable Overpower Protection: Protects the system by limiting the power output during overload situations.
3. Short Circuit Protection: Provides safety by shutting down the system in the event of a short circuit.
4. Internal Leading-Edge Blanking: Minimizes the effect of noise by blanking the leading edge of the current sense signal.
5. Soft-Start Capability: Reduces stress on components during startup by gradually increasing the output power.
6. Dynamic Self-Supply (DSS): Eliminates the need for an auxiliary winding, simplifying the design and reducing cost.
7. Wide Operating Frequency Range: Supports a broad range of applications by allowing frequency adjustments.
8. Frequency Jittering: Enhances EMI performance by spreading the energy over a wider frequency band.
These features make the NCP1251BSN65T1G a versatile and efficient choice for power supply designs.
1. Low Startup Current: This helps in reducing standby power consumption, enhancing efficiency in low-load conditions.
2. Adjustable Overpower Protection: Protects the system by limiting the power output during overload situations.
3. Short Circuit Protection: Provides safety by shutting down the system in the event of a short circuit.
4. Internal Leading-Edge Blanking: Minimizes the effect of noise by blanking the leading edge of the current sense signal.
5. Soft-Start Capability: Reduces stress on components during startup by gradually increasing the output power.
6. Dynamic Self-Supply (DSS): Eliminates the need for an auxiliary winding, simplifying the design and reducing cost.
7. Wide Operating Frequency Range: Supports a broad range of applications by allowing frequency adjustments.
8. Frequency Jittering: Enhances EMI performance by spreading the energy over a wider frequency band.
These features make the NCP1251BSN65T1G a versatile and efficient choice for power supply designs.
Pinout
The NCP1251BSN65T1G is a switch-mode power supply controller from ON Semiconductor, designed for flyback converters. It is commonly used in applications such as adapters, chargers, and offline power supplies. This device is housed in an SOT-23-6 package, meaning it has 6 pins.
Here's a brief overview of its pin functions:
1. GND (Pin 1): Ground reference for the IC.
2. FB (Pin 2): Feedback input. It regulates the output voltage by monitoring this pin.
3. CS (Pin 3): Current sense input. It detects the current flowing through the circuit to provide overcurrent protection.
4. DRV (Pin 4): Drive output. Connects to the gate of an external MOSFET to control its switching.
5. VCC (Pin 5): Power supply input for the IC.
6. NC (Pin 6): No connection or a dummy pin for additional spacing in the package.
This controller is typically used for its low standby power and high efficiency in power conversion applications.
Here's a brief overview of its pin functions:
1. GND (Pin 1): Ground reference for the IC.
2. FB (Pin 2): Feedback input. It regulates the output voltage by monitoring this pin.
3. CS (Pin 3): Current sense input. It detects the current flowing through the circuit to provide overcurrent protection.
4. DRV (Pin 4): Drive output. Connects to the gate of an external MOSFET to control its switching.
5. VCC (Pin 5): Power supply input for the IC.
6. NC (Pin 6): No connection or a dummy pin for additional spacing in the package.
This controller is typically used for its low standby power and high efficiency in power conversion applications.
Manufacturer
The NCP1251BSN65T1G is manufactured by ON Semiconductor, which is now known as onsemi. onsemi is a leading semiconductor manufacturer that focuses on innovative solutions for a wide range of sectors, including automotive, industrial, cloud power, and IoT. The company specializes in power and signal management, logic, discrete, and custom devices, catering to the needs of various technology-driven applications.
Application
The NCP1251BSN65T1G is a PWM controller commonly used in power management applications. Key areas include:
1. AC-DC Power Supplies: Employed in various consumer electronics for efficient power conversion.
2. Battery Chargers: Used in both industrial and consumer battery charging systems.
3. LED Drivers: Provides power regulation in LED lighting systems.
4. Adapters and Offline Converters: Suitable for use in small form-factor adapters and converters with low power requirements.
5. Standby Power Supplies: Utilized in systems where low standby power consumption is critical.
These applications benefit from its high efficiency, low standby power consumption, and compact design.
1. AC-DC Power Supplies: Employed in various consumer electronics for efficient power conversion.
2. Battery Chargers: Used in both industrial and consumer battery charging systems.
3. LED Drivers: Provides power regulation in LED lighting systems.
4. Adapters and Offline Converters: Suitable for use in small form-factor adapters and converters with low power requirements.
5. Standby Power Supplies: Utilized in systems where low standby power consumption is critical.
These applications benefit from its high efficiency, low standby power consumption, and compact design.
Package
The NCP1251BSN65T1G is housed in an SOT-23-6 package, a small surface-mount package type commonly used for electronic components, featuring six leads.
