Overview
The NCP1216D100R2G, produced by onsemi, is an enhanced PWM current-mode controller designed for high-power universal off-line supplies. This component is housed in a SOIC-8 package and represents an advanced version of the NCP1200-based controllers. It is particularly suited for applications requiring low part count, such as AC-DC adapters and TV power supplies. The NCP1216 features high drive capability, internal ramp compensation, and built-in frequency jittering, which simplify the design of modern power supplies and improve their efficiency and EMI signature.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Oscillation Frequency (100 kHz Version) | 90 | 100 | 110 | kHz |
| Maximum Duty Cycle (NCP1216) | 69 | - | 75 | % |
| Internal Pullup Resistor (FB Pin) | 20 | - | - | kΩ |
| Internal Ramp Level @ 25°C | 2.6 | 2.9 | 3.2 | V |
| Internal Ramp Resistance to CS Pin | 19 | - | - | kΩ |
| Peak Current Capability | - | - | 500 | mA |
| Temperature Shutdown | - | - | 155 | °C |
| Storage Temperature Range | -60 | - | 150 | °C |
| ESD Capability (HBM Model) | - | - | 2000 | V |
Key Features
- No Auxiliary Winding Operation: The NCP1216 operates using the Dynamic Self-Supply (DSS) 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 and reduce standby power.
- Internal Ramp Compensation: Prevents sub-harmonic oscillations in continuous conduction mode designs.
- Built-In Frequency Jittering: Improves the EMI signature by modulating the internal switching frequency.
- Auto-Recovery Internal Output Short-Circuit Protection: Protects against overcurrent conditions and automatically recovers once the fault is cleared.
- Extremely Low No-Load Standby Power: Enhances efficiency at light loads.
- High Drive Capability: Drives large gate-charge MOSFETs.
- Internal 1.0 ms Soft-Start (NCP1216A Only): Ensures smooth start-up operation.
Applications
The NCP1216D100R2G is ideal for various applications, including:
- AC-DC Adapters: Suitable for high-efficiency power supplies with minimal component count.
- TV Power Supplies: Enhances performance and efficiency in TV power supply designs.
- Battery Chargers: Benefits from the dynamic self-supply and adjustable skip cycle features.
- Other Off-Line Appliances: Applicable to a wide range of off-line power supplies requiring high performance and efficiency.
Q & A
- What is the primary function of the NCP1216D100R2G?
The NCP1216D100R2G is a PWM current-mode controller designed for high-power universal off-line supplies.
- 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 adjustable skip cycle feature work?
The adjustable skip cycle feature allows the designer to set the level at which the skip cycle takes place, ensuring noise-free operation and reducing standby power.
- What is the purpose of internal ramp compensation?
Internal ramp compensation prevents sub-harmonic oscillations in continuous conduction mode designs.
- How does the built-in frequency jittering improve the EMI signature?
The built-in frequency jittering modulates the internal switching frequency, which softens the controller’s EMI signature.
- What is the maximum peak current capability of the NCP1216D100R2G?
The maximum peak current capability is 500 mA.
- What is the temperature shutdown threshold for the NCP1216D100R2G?
The temperature shutdown threshold is 155°C.
- What is the storage temperature range for the NCP1216D100R2G?
The storage temperature range is from -60°C to 150°C.
- What are some common applications for the NCP1216D100R2G?
Common applications include AC-DC adapters, TV power supplies, battery chargers, and other off-line appliances.
- How does the NCP1216D100R2G protect against overcurrent conditions?
The NCP1216D100R2G enters a safe burst mode during overcurrent conditions and automatically recovers once the fault is cleared.
