Overview
The NCP1219BD65R2G is a PWM (Pulse Width Modulation) controller produced by onsemi, designed for AC-DC applications requiring low standby power. This device is part of the NCP1219 series, which offers pin-to-pin compatibility with the existing NCP12XX series. It features adjustable skip level, external latch input, and high voltage startup circuit, making it an excellent choice for converters where ruggedness and component cost are key constraints.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Oscillator Frequency | 65 kHz | |
| Maximum Duty Ratio | 75 - 85% | |
| Supply Voltage Startup Threshold | 11.2 - 12.7 V | V |
| Minimum Operating Voltage | 9.0 - 9.9 V | V |
| Undervoltage Lockout (UVLO) | 9.4 V | V |
| High Voltage (HV) Input Range | -0.3 to 500 V | V |
| Peak Source/Sink Current Drive Capability | 500 mA / 800 mA | A |
| Thermal Shutdown Temperature | 155°C | °C |
| Package Type | 7-SOIC |
Key Features
- Fixed-Frequency Current-Mode Operation with Ramp Compensation
- Dynamic Self Supply (DSS) eliminates the need for an auxiliary winding
- Timer-Based Fault Protection for improved overload detection
- Cycle Skip reduces input power in standby mode
- Latch and Auto-Recovery Overload Protection Options
- Internal High Voltage Startup Circuit
- Accurate Current Limit Detector (±5%)
- Adjustable Skip Level
- Latch Input for easy implementation of overvoltage and overtemperature protection
- Frequency Modulation for softened EMI signature
- Frequency Jittering
- Soft-Start Sequence
Applications
- AC-DC Adapters for Notebooks, LCD Monitors
- Offline Battery Chargers
- Consumer Electronic Appliances (STB, DVD, DVDR)
- Printer Adapters
Q & A
- What is the primary function of the NCP1219BD65R2G?
The NCP1219BD65R2G is a PWM controller designed for AC-DC applications, particularly for converters requiring low standby power.
- What are the oscillator frequency options for the NCP1219 series?
The NCP1219 series offers oscillator frequency options of 65 kHz and 100 kHz.
- What is the Dynamic Self Supply (DSS) feature?
The DSS feature eliminates the need for an auxiliary winding by using an internal high voltage startup circuit to supply the controller.
- How does the cycle skip mode work?
The cycle skip mode reduces input power in standby mode by entering skip or burst mode at light loads.
- What are the overload protection options available?
The device offers latch and auto-recovery overload protection options.
- 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 ramp compensation work?
Ramp compensation is used to cure subharmonic oscillations by injecting a current ramp synchronized with the clock into the CS pin.
- What is the thermal shutdown temperature for the NCP1219BD65R2G?
The thermal shutdown temperature is 155°C.
- What package type is the NCP1219BD65R2G available in?
The device is available in a 7-SOIC package.
- What are some typical applications for the NCP1219BD65R2G?
Typical applications include AC-DC adapters, offline battery chargers, and consumer electronic appliances.
