Overview
The NCP1217D65R2G is an AC to DC switching converter off-line switcher produced by onsemi. This component is part of the NCP1217 series, which represents an enhanced version of the NCP1203-based controllers. It is housed in an 8-pin SOIC N package and is designed to drive large gate-charge MOSFETs, making it suitable for modern AC/DC adapters and other power supply applications. The NCP1217D65R2G was introduced on August 11, 2003, and is manufactured in the Philippines. It complies with EU RoHS regulations (2011/65/EU, 2015/863).
Key Specifications
| Parameter | Value | 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 (NCP1217) | 69 - 74 - 80 | % |
| Maximum Duty-Cycle (NCP1217A) | 42 - 46.5 - 50 | % |
| Maximum Junction Temperature | 150 | °C |
| Storage Temperature Range | -60 to +150 | °C |
| ESD Capability (HBM Model) | 2.0 kV | |
| ESD Capability (Machine Model) | 200 V | |
| Package Type | 8-Pin SOIC N |
Key Features
- Current-Mode Control Topology: Provides excellent input audio-susceptibility and inherent pulse-by-pulse control.
- Internal Ramp Compensation: Prevents subharmonic oscillations in continuous conduction mode designs.
- Auto-Recovery Internal Output Short-Circuit Protection: Disables output pulses and enters a safe burst mode during overcurrent conditions, auto-recovering once the fault is cleared.
- Internal 1.0 ms Soft-Start (NCP1217A Only): Ensures a smooth startup sequence.
- High-Voltage Startup FET: Ensures a clean and lossless startup sequence by injecting a constant current into the VCC capacitor during startup.
- Adjustable Skip-Cycle Capability: Automatically skips switching cycles when the output power demand drops below a given level, enhancing efficiency at light loads.
- Externally Triggerable Latchoff: Allows for external control to shut off the device if necessary).
Applications
The NCP1217D65R2G is particularly suited for low-cost AC/DC adapters, TV power supplies, and other applications where low part-count is a key parameter. It is also used in VCRs and other devices requiring low no-load standby power. The component's high-performance high-voltage technology makes it an ideal alternative to UC384X-based designs).
Q & A
- What is the primary function of the NCP1217D65R2G?
The NCP1217D65R2G is an AC to DC switching converter off-line switcher, designed to control and manage power conversion in various applications.
- In what package type is the NCP1217D65R2G available?
The NCP1217D65R2G is housed in an 8-pin SOIC N package.
- What are the oscillation frequencies available for the NCP1217D65R2G?
The oscillation frequencies available are 65 kHz, 100 kHz, and 133 kHz.
- What is the maximum junction temperature for the NCP1217D65R2G?
The maximum junction temperature is 150°C.
- Does the NCP1217D65R2G have built-in overvoltage protection?
Yes, the NCP1217D65R2G features built-in overvoltage protection and internal output short-circuit protection.
- How does the skip cycle mode work in the NCP1217D65R2G?
The skip cycle mode is activated when the output power demand drops below a certain level, and it skips switching cycles to enhance efficiency at light loads.
- What is the purpose of the high-voltage startup FET in the NCP1217D65R2G?
The high-voltage startup FET ensures a clean and lossless startup sequence by injecting a constant current into the VCC capacitor during startup.
- Is the NCP1217D65R2G compliant with EU RoHS regulations?
Yes, the NCP1217D65R2G is compliant with EU RoHS regulations (2011/65/EU, 2015/863).
- What are some typical applications of the NCP1217D65R2G?
Typical applications include low-cost AC/DC adapters, TV power supplies, and VCRs.
- How does the NCP1217D65R2G handle short-circuit conditions?
In the event of a short circuit, the NCP1217D65R2G disables output pulses and enters a safe burst mode, auto-recovering once the fault condition is cleared.
