Overview
The NCP1251ASN65T1G is a current mode PWM (Pulse Width Modulation) controller designed by ON Semiconductor. It is specifically tailored for high-efficiency DC-DC converters in applications such as offline adapters, AC-DC converters, and 45W adapters. This device is known for its low EMI emissions, internal thermal shutdown protection, and comprehensive safety features. The NCP1251ASN65T1G operates with a wide input voltage range, adjustable output voltage, programmable frequency, and high temperature operation up to 150°C, making it suitable for high-density designs and ruggedized power modules in automotive and industrial applications.
Key Specifications
| Attribute | Value |
|---|---|
| Status | Active |
| Case Outline | 318G-02 |
| MSL Type | 1 |
| Topology | Flyback |
| Control Mode | Current Mode |
| Maximum Switching Frequency | 71 kHz |
| Output Voltage | 28.3 V |
| Output Current | 300 mA / 500 mA |
| Number of Outputs | 1 |
| Mounting Type | Surface Mount |
| Fall Time | 30 ns |
| Rise Time | 40 ns |
| Package Type | TSOP-6 |
| Pin Count | 6 |
| Maximum Duty Cycle | 84% |
| Dimensions | 3.1 x 1.7 x 1 mm |
| Maximum Operating Temperature | +150 °C |
| Maximum Operating Supply Voltage | 28 V |
| UVLO (V) | 8.8 V |
| Short Circuit Protection | Yes |
| Latch | Yes |
| Soft Start | Yes |
Key Features
- Low EMI emissions for sensitive applications
- Internal thermal shutdown protection
- High efficiency DC-DC converters
- Surge protection for DC-DC converters
- Integrated overcurrent and short-circuit protection
- Comprehensive safety features including overvoltage protection and thermal shutdown
- Programmable frequency for flexible design options
- High temperature operation up to 150°C
- Wide operating temperature range -40°C to 125°C
- Compact package size for high-density designs
- Over Power Protection (OPP) via two external resistors
- Latched Over Voltage Protection (OVP)
Applications
- Offline Adapters
- AC-DC converters
- 45W Adapters
The NCP1251ASN65T1G is particularly suited for these applications due to its low EMI emissions and comprehensive safety features, making it ideal for automotive and industrial environments where reliability and safety are critical.
Q & A
- What is the NCP1251ASN65T1G used for?
The NCP1251ASN65T1G is a current mode PWM controller used for high-efficiency DC-DC converters in offline adapters, AC-DC converters, and 45W adapters.
- Who is the manufacturer of the NCP1251ASN65T1G?
The manufacturer of the NCP1251ASN65T1G is ON Semiconductor.
- What is the maximum switching frequency of the NCP1251ASN65T1G?
The maximum switching frequency of the NCP1251ASN65T1G is 71 kHz.
- What is the package type of the NCP1251ASN65T1G?
The package type of the NCP1251ASN65T1G is TSOP-6.
- What are the key safety features of the NCP1251ASN65T1G?
The key safety features include internal thermal shutdown protection, overvoltage protection, short-circuit protection, and overcurrent protection.
- What is the maximum operating temperature of the NCP1251ASN65T1G?
The maximum operating temperature of the NCP1251ASN65T1G is +150 °C.
- Does the NCP1251ASN65T1G support programmable frequency?
Yes, the NCP1251ASN65T1G supports programmable frequency for flexible design options.
- What is the purpose of the Over Power Protection (OPP) in the NCP1251ASN65T1G?
The Over Power Protection (OPP) allows for maximum delivered power without affecting standby performance, adjustable via two external resistors.
- Is the NCP1251ASN65T1G RoHS compliant?
Yes, the NCP1251ASN65T1G is RoHS compliant.
- What are some equivalent products to the NCP1251ASN65T1G?
Some equivalent products include Texas Instruments TPS62175, STMicroelectronics LTM1232, and Analog Devices ADP1984 and ADP1992.
- What is the typical application of the NCP1251ASN65T1G in terms of power supply?
The NCP1251ASN65T1G is typically used in offline power supplies, where it delivers rugged and high-performance capabilities in a compact TSOP-6 package.
