Overview
The NCP1216AP65G, produced by ON Semiconductor, is a PWM Current-Mode Controller designed for high-power universal off-line supplies. This controller is an enhanced version of the NCP1200 series and is housed in either a SOIC-8 or PDIP-7 package. It features high drive capability, making it suitable for driving large gate-charge MOSFETs. The NCP1216AP65G incorporates internal ramp compensation, built-in frequency jittering, and a dynamic self-supply mechanism, eliminating the need for an auxiliary winding. This makes it ideal for applications such as AC-DC adapters, TV power supplies, and battery chargers.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Oscillation Frequency (65 kHz Version) | 58.5 | 65 | 71.5 | kHz |
| Oscillation Frequency (100 kHz Version) | 90 | 100 | 110 | kHz |
| Oscillation Frequency (133 kHz Version) | 120 | 133 | 146 | kHz |
| Maximum Duty Cycle (NCP1216A) | 46.5 | 50 | 53.5 | % |
| Internal Pullup Resistor (Rup) | 20 | kΩ | ||
| Peak Current Capability | 500 | mA | ||
| Operating Temperature Range | 0 | 150 | °C | |
| Package Type | SOIC-8, PDIP-7 |
Key Features
- No Auxiliary Winding Operation: The controller is self-supplied from the high-voltage rail, eliminating the need for an auxiliary winding.
- Current-Mode Control with Adjustable Skip-Cycle Capability: Allows for efficient operation at light loads and reduces standby power.
- Internal Ramp Compensation: Prevents sub-harmonic oscillations in continuous conduction mode designs.
- Built-In Frequency Jittering: Improves EMI signature by modulating the internal switching frequency.
- Auto-Recovery Internal Output Short-Circuit Protection: Ensures safe operation during overcurrent conditions.
- Extremely Low No-Load Standby Power: Optimized for energy efficiency.
- Internal Temperature Shutdown: Protects the device from overheating.
- Direct Optocoupler Connection: Simplifies feedback loop design.
- SPICE Models Available: For transient and AC analysis.
- Pin-to-Pin Compatible with NCP1200 Series: Easy migration from previous models.
Applications
- High Power AC-DC Converters for TVs, Set-Top Boxes, etc.
- Offline Adapters for Notebooks
- Telecom DC-DC Converters
- All Power Supplies
- Battery Chargers
Q & A
- What is the primary function of the NCP1216AP65G?
The NCP1216AP65G is a PWM Current-Mode Controller designed for high-power universal off-line supplies, particularly in applications such as AC-DC adapters and TV power supplies.
- What are the available switching frequencies for the NCP1216AP65G?
The controller is available in versions with fixed frequencies of 65 kHz, 100 kHz, and 133 kHz.
- Does the NCP1216AP65G require an auxiliary winding?
No, the NCP1216AP65G does not require an auxiliary winding as it uses a dynamic self-supply mechanism to generate its VCC from the high-voltage rail.
- How does the skip cycle mode work in the NCP1216AP65G?
The skip cycle mode is activated when the output power demand drops below a certain level, causing the controller to skip switching cycles and reduce standby power.
- What is the purpose of the internal ramp compensation in the NCP1216AP65G?
The internal ramp compensation prevents sub-harmonic oscillations in continuous conduction mode designs by injecting a controlled amount of ramp compensation via the Current Sense pin.
- How does the built-in frequency jittering improve the EMI signature?
The built-in frequency jittering modulates the internal switching frequency, which helps to spread the energy and soften the controller’s EMI signature.
- What is the maximum duty cycle for the NCP1216A version?
The maximum duty cycle for the NCP1216A version is 50%.
- What is the peak current capability of the NCP1216AP65G?
The peak current capability of the NCP1216AP65G is 500 mA.
- What are the typical applications for the NCP1216AP65G?
Typical applications include high power AC-DC converters, offline adapters for notebooks, telecom DC-DC converters, and all power supplies.
- Is the NCP1216AP65G compatible with previous models?
Yes, the NCP1216AP65G is pin-to-pin compatible with the NCP1200 series.
