Overview
The NCP1219AD65R2G is a PWM (Pulse Width Modulation) controller produced by onsemi, designed for AC-DC power conversion applications. It is part of the NCP12XX series and offers several advanced features to enhance the performance and efficiency of power supplies. This controller is particularly suited for applications requiring low standby power consumption and high reliability.
The device features a fixed-frequency current-mode operation with options for 65 kHz and 100 kHz switching frequencies. It includes an internal high voltage startup circuit, dynamic self-supply (DSS), and adjustable skip mode, which significantly reduce the component count and simplify the transformer design. The NCP1219AD65R2G also incorporates various protection mechanisms, including timer-based fault detection, thermal shutdown, and latch input for overvoltage and overtemperature protection.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Oscillator Frequency (65 kHz Option) | fOSC | 55 | 65 | 71 | kHz |
| Oscillator Frequency (100 kHz Option) | fOSC | 85 | 100 | 105 | kHz |
| Maximum Duty Ratio | D | 75 | 80 | 85 | % |
| Supply Voltage Startup Threshold | VCC(on) | 11.2 | 12.7 | 13.8 | V |
| Minimum Operating Voltage | VCC(MIN) | 9.0 | 9.9 | 10.8 | V |
| Undervoltage Lockout Threshold | UVLO | 8.4 | 9.4 | 10.0 | V |
| High Voltage Input | VHV | -0.3 | - | 500 | V |
| Peak Source/Sink Current Drive Capability | - | - | 500/800 | mA | |
| Thermal Shutdown Temperature | TSHDN | - | 155 | - | °C |
Key Features
- Fixed-Frequency Current-Mode Operation: Available in 65 kHz and 100 kHz switching frequency options with ramp compensation to prevent subharmonic oscillations.
- Dynamic Self Supply (DSS): Eliminates the need for an auxiliary winding, simplifying transformer design and useful in applications with varying output voltage.
- Timer-Based Fault Protection: Enhances overload detection and includes double hiccup mode for reduced power dissipation during faults.
- Adjustable Skip Level: Reduces input power in standby mode.
- Latch Input: Allows for easy implementation of overvoltage and overtemperature protection.
- Internal High Voltage Startup Circuit: Eliminates the need for external startup components and provides faster startup times.
- Frequency Modulation: Softens the EMI signature.
- Thermal Shutdown and Overload Protection: Includes thermal shutdown and overload protection options (latch or auto-retry).
- Soft-Start Capability: Reduces inrush current during startup.
Applications
- AC-DC Adapters for Notebooks and LCD Monitors: Suitable for power supplies in portable electronics.
- Offline Battery Chargers: Ideal for battery charging applications requiring efficient power conversion.
- Consumer Electronic Appliances: Used in set-top boxes (STB), DVD, and DVDR players.
- Printer Adapters: Useful in applications where output voltage varies during operation.
Q & A
- What are the available switching frequencies for the NCP1219AD65R2G?
The NCP1219AD65R2G is available in 65 kHz and 100 kHz switching frequency options.
- What is the Dynamic Self Supply (DSS) feature?
The DSS feature eliminates the need for an auxiliary winding, simplifying transformer design and reducing component count.
- How does the adjustable skip level feature work?
The adjustable skip level reduces input power in standby mode by allowing the controller to skip or burst at light loads.
- What protection mechanisms are included in the NCP1219AD65R2G?
The device includes timer-based fault protection, thermal shutdown, and latch input for overvoltage and overtemperature protection.
- What is the purpose of the internal high voltage startup circuit?
The internal high voltage startup circuit eliminates the need for external startup components and provides faster startup times.
- How does the frequency modulation feature work?
The frequency modulation feature softens the EMI signature by introducing a small variation in the switching frequency.
- What are the typical applications for the NCP1219AD65R2G?
Typical applications include AC-DC adapters for notebooks and LCD monitors, offline battery chargers, consumer electronic appliances, and printer adapters.
- What is the maximum duty ratio of the NCP1219AD65R2G?
The maximum duty ratio is up to 85%.
- How does the soft-start capability work?
The soft-start capability reduces inrush current during startup by gradually increasing the output voltage.
- What is the thermal shutdown temperature of the NCP1219AD65R2G?
The thermal shutdown temperature is typically 155°C.
