Overview
The NCP1216AD65R2G, produced by onsemi, is an enhanced version of the NCP1200-based PWM current-mode controllers. It is designed for high-power universal off-line supplies and is housed in either an SOIC-8 or PDIP-7 package. This controller is notable for its high drive capability, allowing it to drive large gate-charge MOSFETs, which is crucial for modern AC/DC adapters. The NCP1216AD65R2G features internal ramp compensation and built-in frequency jittering, which improve the design and efficiency of AC/DC converters. It also operates without the need for an auxiliary winding, 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 |
| Internal IC Consumption (No Output Load, FSW = 65 kHz) | 990 | 1110 | 1245 | μA |
| Internal IC Consumption (No Output Load, FSW = 100 kHz) | 1025 | 1180 | 1285 | μA |
| High-Voltage Current Source | 8.0 | 9.0 | - | mA |
| Output Voltage Rise-time @ CL = 1.0 nF | 60 | - | - | ns |
| Output Voltage Fall-time @ CL = 1.0 nF | 20 | - | - | ns |
| Maximum Junction Temperature | - | - | 150 | °C |
| Temperature Shutdown | - | - | 155 | °C |
Key Features
- No Auxiliary Winding Operation: The controller supplies itself 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 by skipping switching cycles when the output power demand is low.
- Internal Ramp Compensation: Prevents sub-harmonic oscillations in continuous conduction mode designs by injecting ramp compensation via a single resistor.
- Built-In Frequency Jittering: Improves the EMI signature by modulating the internal switching frequency.
- Auto-Recovery Internal Output Short-Circuit Protection: The device enters a safe burst mode during overcurrent conditions and auto-recovers once the fault is cleared.
- Extremely Low No-Load Standby Power: Enhances efficiency at light loads.
- 500 mA Peak Current Capability: Supports high-power applications.
- Internal Temperature Shutdown: Protects the device from overheating.
- Direct Optocoupler Connection: Simplifies feedback loop design).
Applications
- High Power AC/DC Converters for TVs, Set-Top Boxes, etc..
- Offline Adapters for Notebooks.
- Telecom DC/DC Converters).
- All Power Supplies: Especially those requiring high efficiency and low part count).
Q & A
- What is the NCP1216AD65R2G used for?
The NCP1216AD65R2G is a PWM current-mode controller used in high-power universal off-line supplies, such as AC/DC adapters, TV power supplies, and telecom DC/DC converters.
- What package types are available for the NCP1216AD65R2G?
The NCP1216AD65R2G is available in SOIC-8 and PDIP-7 packages.
- What is the significance of the Dynamic Self-Supply (DSS) feature?
The DSS feature allows the controller to supply itself 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 controller to skip switching cycles when the output power demand is low, reducing standby power and preventing acoustic noise.
- What is the purpose of internal ramp compensation?
Internal ramp compensation prevents sub-harmonic oscillations in continuous conduction mode designs by injecting a controlled amount of ramp compensation via a single resistor.
- How does the built-in frequency jittering improve the EMI signature?
The built-in frequency jittering modulates the internal switching frequency, spreading the energy and softening the controller’s EMI signature.
- What is the maximum junction temperature for the NCP1216AD65R2G?
The maximum junction temperature for the NCP1216AD65R2G is 150°C.
- How does the auto-recovery internal output short-circuit protection work?
The device enters a safe burst mode during overcurrent conditions and auto-recovers once the fault is cleared.
- What is the peak current capability of the NCP1216AD65R2G?
The NCP1216AD65R2G has a peak current capability of 500 mA.
- What are some typical applications for the NCP1216AD65R2G?
Typical applications include high power AC/DC converters for TVs and set-top boxes, offline adapters for notebooks, and telecom DC/DC converters).
