Overview
The NCP1027P065G, produced by ON Semiconductor, is a high-voltage switcher designed for medium power offline Switch-Mode Power Supplies (SMPS). This component targets output power levels from a few watts up to 15 W in universal mains flyback applications. It integrates a power MOSFET, a startup current source, and various protection mechanisms, making it an efficient and reliable choice for power supply designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Power Switch Circuit On-State Resistance (RDS(on)) at TJ = 25°C | 5.8 | Ω |
| Drain Voltage (BVdss) | 700 | V |
| Drain Current Peak During Transformer Saturation (IDS(pk)) | 1.8 | A |
| Oscillation Frequency (65 kHz Version) at TJ = 25°C | 58.5 - 71.5 | kHz |
| Oscillation Frequency (100 kHz Version) at TJ = 25°C | 90 - 110 | kHz |
| Maximum Duty Cycle | 74 - 87 | % |
| Internal Pullup Resistor (Rupp) | 16 | kΩ |
| Brown-Out Level (VBO) | 510 - 620 | mV |
| Over Power Protection Pin Voltage (IOPPtripV) | 1.5 | V |
Key Features
- Current-Mode Operation: The controller uses a current-mode control architecture with adjustable ramp compensation, ensuring efficient and stable continuous or discontinuous conduction designs.
- High-Voltage Power Switch Circuit: Features a 700 V MOSFET with a typical RDS(on) of 5.8 Ω at TJ = 25°C.
- Startup Current Source: Derives current directly from the bulk line to charge the VCC capacitor, ensuring efficient startup.
- Protection Mechanisms: Includes adjustable brown-out circuitry, overvoltage protection (OVP), over power protection (OPP), and a timer for overload or short-circuit detection with auto-recovery.
- Low Standby Power: Reduces power waste during light load conditions through skip-cycle operation, achieving low standby power consumption.
- Soft-Start and Skip-Cycle Operation: Enhances efficiency and reduces power waste during light load conditions.
Applications
The NCP1027P065G is suitable for various applications requiring medium power offline SMPS, including:
- Universal mains flyback power supplies.
- Standby and auxiliary offline power supplies.
- Applications requiring higher output power levels up to 15 W.
- Low-cost and rugged SMPS designs.
Q & A
- What is the typical RDS(on) of the NCP1027P065G MOSFET at TJ = 25°C?
The typical RDS(on) is 5.8 Ω at TJ = 25°C.
- What are the oscillation frequencies available for the NCP1027P065G?
The oscillation frequencies are 65 kHz and 100 kHz.
- What is the maximum duty cycle of the NCP1027P065G?
The maximum duty cycle is 74% to 87%.
- How does the NCP1027P065G handle low input voltage conditions?
The component includes an adjustable brown-out circuitry that blocks activity until a sufficient input level is reached.
- What protection mechanisms are integrated into the NCP1027P065G?
The component includes overvoltage protection (OVP), over power protection (OPP), and a timer for overload or short-circuit detection with auto-recovery.
- How does the NCP1027P065G reduce power waste during light load conditions?
The component uses skip-cycle operation to reduce power waste during light load conditions.
- What is the purpose of the startup current source in the NCP1027P065G?
The startup current source derives current directly from the bulk line to charge the VCC capacitor, ensuring efficient startup.
- What is the typical startup time for the NCP1027P065G?
The typical startup time is approximately 105 ms.
- How does the NCP1027P065G handle fault conditions such as output short-circuits?
The component includes a timer that detects overload or short-circuit and stops all operations, ensuring safe auto-recovery.
- What is the significance of the internal active Zener diode in the NCP1027P065G?
The internal active Zener diode protects the switcher against lethal VCC runaways by triggering the overvoltage protection (OVP) circuit.
