Overview
The NCP1250BSN65T1G is a highly integrated PWM (Pulse Width Modulation) controller designed by ON Semiconductor for use in offline power supplies. This component is part of the NCP1250 series and is specifically configured for 65 kHz operation with auto-recovery short-circuit protection. It is housed in a TSOP-6 package, making it suitable for compact and efficient power supply designs. The NCP1250BSN65T1G offers advanced features such as fixed-frequency current-mode control, internal and adjustable over power protection, and frequency foldback down to 26 kHz in light load conditions, ensuring high performance and reliability in various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Power Supply Voltage | 28 | V |
| DRV Pin Voltage (Transient) | VCC + 0.3 | V |
| Maximum Voltage on Low Power Pins (CS, FB, OPP) | -0.3 to 10 | V |
| Maximum Junction Temperature | 150 | °C |
| Storage Temperature Range | -60 to +150 | °C |
| Oscillation Frequency (65 kHz version) | 61 to 71 | kHz |
| VCC Increasing Level for Driving Pulses | 16 to 20 | V |
| VCC Decreasing Level for Driving Pulses | 8.2 to 9.4 | V |
| Internal Soft-Start Duration | 4.0 ms | |
| Timer-Based Auto-Recovery Fault Timer Duration | 100 to 160 ms |
Key Features
- Fixed-Frequency 65 kHz Current-Mode Control Operation: Ensures stable and efficient switching.
- Internal and Adjustable Over Power Protection (OPP) Circuit: Allows for non-dissipative OPP through a simple external resistor configuration.
- Frequency Foldback Down to 26 kHz and Skip-Cycle in Light Load Conditions: Optimizes efficiency and reduces standby power.
- Internal Ramp Compensation: Eliminates sub-harmonic oscillations.
- Internal Fixed 4 ms Soft-Start: Reduces inrush current during startup.
- 100 ms Timer-Based Auto-Recovery Short-Circuit Protection: Provides robust protection against short circuits.
- Frequency Jittering in Normal and Frequency Foldback Modes: Improves EMI performance by spreading out conducted noise.
- OVP Input for Improved Robustness: Protects against overvoltage conditions.
- Low Startup Current and Standby Power: Less than 15 μA startup current and less than 100 mW standby power.
- EPS 2.0 Compliant and Pb-Free Device: Meets environmental and regulatory standards.
Applications
- AC-DC Converters for TVs, Set-top Boxes, and Printers
- Offline Adapters for Notebooks and Netbooks
Q & A
- What is the maximum VCC power supply voltage for the NCP1250BSN65T1G?
The maximum VCC power supply voltage is 28 V. - What are the typical applications of the NCP1250BSN65T1G?
Typical applications include AC-DC converters for TVs, set-top boxes, and printers, as well as offline adapters for notebooks and netbooks. - What is the oscillation frequency of the NCP1250BSN65T1G?
The oscillation frequency is 61 to 71 kHz. - How does the NCP1250BSN65T1G handle over power protection?
The NCP1250BSN65T1G features an internal and adjustable over power protection (OPP) circuit that can be configured using external resistors. - What is the purpose of frequency foldback in the NCP1250BSN65T1G?
Frequency foldback reduces the switching frequency down to 26 kHz in light load conditions to optimize efficiency and reduce standby power. - Does the NCP1250BSN65T1G have built-in short-circuit protection?
Yes, it has a 100 ms timer-based auto-recovery short-circuit protection. - How does the NCP1250BSN65T1G improve EMI performance?
The component uses frequency jittering in normal and frequency foldback modes to improve EMI performance by spreading out conducted noise. - What is the internal soft-start duration of the NCP1250BSN65T1G?
The internal soft-start duration is 4.0 ms. - Is the NCP1250BSN65T1G compliant with any specific standards?
Yes, it is EPS 2.0 compliant and is a Pb-free device. - What is the maximum junction temperature for the NCP1250BSN65T1G?
The maximum junction temperature is 150°C.
