Overview
The NCP1216AP100G, produced by ON Semiconductor, is an enhanced version of the NCP1200-based PWM current-mode controllers. It is designed to drive large gate-charge MOSFETs, making it ideal for modern AC/DC adapters and other high-power applications. The controller is available in SOIC-8 or PDIP-7 packages and features an internal structure that operates at different fixed frequencies, eliminating the need for an auxiliary winding. This Dynamic Self-Supply (DSS) technology allows the controller to be directly supplied from the high-voltage rail, simplifying the design process for applications such as battery chargers and TV power supplies.
Key Specifications
| Characteristic | 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 (NCP1216) | 69 | - | 75 | % |
| Maximum Duty Cycle (NCP1216A) | 42 | - | 50 | % |
| Internal Pullup Resistor (Rup) | - | 20 kΩ | - | kΩ |
| Internal Ramp Level @ 25°C (Vramp) | 2.6 | 2.9 | 3.2 | V |
| Internal Ramp Resistance to CS Pin (Rramp) | - | 19 kΩ | - | kΩ |
| Peak Current Capability | - | - | 500 mA | mA |
| Temperature Shutdown (TSD) | - | - | 155 °C | °C |
| Storage Temperature Range | -60 °C | - | 150 °C | °C |
Key Features
- No Auxiliary Winding Operation: The controller is supplied directly from the high-voltage rail, eliminating the need for an auxiliary winding.
- Current-Mode Control with Adjustable Skip-Cycle Capability: Allows for adjustable skip cycle levels to ensure noise-free operation at low peak currents.
- Internal Ramp Compensation: Prevents sub-harmonic oscillations in continuous conduction mode designs.
- Internal 1.0 ms Soft-Start (NCP1216A Only): Ensures a smooth startup process.
- Built-In Frequency Jittering for Better EMI Signature: Modulates the internal switching frequency to improve EMI performance.
- Auto-Recovery Internal Output Short-Circuit Protection: Enters a safe burst mode during overcurrent conditions and auto-recovers once the fault is cleared.
- Extremely Low No-Load Standby Power: Optimized for efficient operation at light loads.
- Direct Optocoupler Connection: Simplifies feedback loop design.
- SPICE Models Available for Transient and AC Analysis: Facilitates detailed simulation and analysis.
- Pin-to-Pin Compatible with NCP1200 Series: Easy migration from previous designs.
Applications
- High Power AC/DC Converters for TVs, Set-Top Boxes, etc.
- Offline Adapters for Notebooks
- Telecom DC/DC Converters
- All Power Supplies
Q & A
- What is the NCP1216AP100G used for?
The NCP1216AP100G is a PWM current-mode controller used in high-power AC/DC converters, offline adapters, and other power supply applications.
- What are the available package types for the NCP1216?
The NCP1216 is available in SOIC-8 and PDIP-7 packages.
- What is the Dynamic Self-Supply (DSS) feature?
The DSS feature allows the controller to be supplied directly from the high-voltage rail, eliminating the need for an auxiliary winding.
- How does the skip cycle mode work?
The skip cycle mode is activated when the output power demand drops below a certain level, causing the controller to skip switching cycles to maintain efficiency and reduce standby power.
- What is the purpose of internal ramp compensation?
Internal ramp compensation prevents sub-harmonic oscillations in continuous conduction mode designs.
- Does the NCP1216 have built-in overcurrent protection?
Yes, the NCP1216 enters a safe burst mode during overcurrent conditions and auto-recovers once the fault is cleared.
- What is the maximum duty cycle for the NCP1216 and NCP1216A?
The maximum duty cycle for the NCP1216 is 75%, and for the NCP1216A, it is limited to 50%.
- What is the peak current capability of the NCP1216?
The peak current capability of the NCP1216 is 500 mA.
- What is the temperature shutdown point for the NCP1216?
The temperature shutdown point for the NCP1216 is 155°C.
- Is the NCP1216 pin-to-pin compatible with other controllers?
Yes, the NCP1216 is pin-to-pin compatible with the NCP1200 series.
