NCP1251ASN65T1G

Overview

Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - High voltage startup - Current mode control - Frequency jittering for EMI reduction - Built-in protection features - Low standby power consumption

Package: SOT-23-6

Essence: The NCP1251ASN65T1G is a high-voltage switcher designed for power management applications. It offers efficient and reliable power conversion with various built-in protection features.

Packaging/Quantity: The NCP1251ASN65T1G is available in a SOT-23-6 package. It is typically sold in reels of 3000 units.

Specifications

• Input Voltage Range: 9V to 20V
• Output Voltage Range: 5V to 15V
• Maximum Output Current: 100mA
• Switching Frequency: 65kHz
• Standby Power Consumption: <50mW
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The NCP1251ASN65T1G has the following pin configuration:

```

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| | --| VCC GND |-- Pin 1: Ground (GND) --| FB CS |-- Pin 2: Current Sense (CS) --| COMP EN |-- Pin 3: Enable (EN) --| VDD HV |-- Pin 4: High Voltage (HV) --| VREF NC |-- Pin 5: Not Connected (NC) --| VCC |-- Pin 6: Supply Voltage (VCC) |___________| ```

Functional Features

1. High Voltage Startup: The NCP1251ASN65T1G can start up from a high input voltage, making it suitable for various power management applications.

2. Current Mode Control: It utilizes current mode control to regulate the output voltage and provide stable operation under different load conditions.

3. Frequency Jittering for EMI Reduction: The IC incorporates frequency jittering techniques to reduce electromagnetic interference (EMI) emissions, ensuring compliance with regulatory standards.

4. Built-in Protection Features: The NCP1251ASN65T1G includes protection features such as overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown, enhancing system reliability and safety.

5. Low Standby Power Consumption: In standby mode, the IC consumes minimal power (<50mW), contributing to energy efficiency and prolonging battery life in portable applications.

Advantages

• High voltage startup capability enables versatile application possibilities.
• Current mode control ensures stable performance across varying load conditions.
• Frequency jittering reduces EMI emissions, meeting regulatory requirements.
• Built-in protection features enhance system reliability and protect against faults.
• Low standby power consumption contributes to energy efficiency.

Disadvantages

• Limited maximum output current of 100mA may restrict usage in high-power applications.
• SOT-23-6 package may not be suitable for all PCB layouts or assembly processes.

Working Principles

The NCP1251ASN65T1G operates based on a current mode control scheme. It regulates the output voltage by adjusting the duty cycle of the internal power switch. The feedback voltage is compared with a reference voltage, and any deviation triggers the necessary adjustments to maintain the desired output voltage. The IC also incorporates frequency jittering techniques to minimize EMI emissions.

Application Field Plans

The NCP1251ASN65T1G finds applications in various power management scenarios, including but not limited to:

1. Battery-powered devices: Portable electronics, handheld instruments, and wireless communication devices can benefit from the IC's low standby power consumption and efficient power conversion.

2. Consumer electronics: The IC can be used in TVs, set-top boxes, audio systems, and other consumer electronic devices to provide reliable power management solutions.

3. Industrial equipment: Power supplies for industrial automation, control systems, and motor drives can utilize the NCP1251ASN65T1G for efficient power conversion and protection features.

4. LED lighting: The IC can be employed in LED drivers to regulate the voltage and current supplied to LEDs, ensuring optimal performance and longevity.

Alternative Models

1. NCP1250ASN50T1G: Similar to NCP1251ASN65T1G but operates at a lower switching frequency of 50kHz.
2. NCP1252ASN33T1G: Offers higher output current capability (up to 200mA) while maintaining similar characteristics to NCP1251ASN65T1G.
3. NCP1252ASN50T1G: Operates at a higher switching frequency of 50kHz, suitable for specific applications requiring faster response times.

These alternative models provide flexibility