Overview
The NCP1247DD065R2G, produced by onsemi, is a fixed-frequency current-mode controller designed for flyback converters. This device is part of the NCP1247 family and is specifically configured with a 65 kHz operating frequency and auto-recovery overload protection. It features advanced functionalities such as dynamic self-supply, frequency foldback, and skip mode for optimized performance in light load and standby conditions. The NCP1247DD065R2G is tailored for applications requiring high efficiency, low standby power consumption, and robust power supply designs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency | 65 kHz | |
| Overload Protection Fault Mode | Auto-recovery | |
| VHV Start Voltage | 111 V | V |
| VHV Stop Voltage | 103 V | V |
| VCC Power Supply Voltage | -0.3 to 28 V | V |
| DRV Pin Maximum Voltage | -0.3 to 20 V | V |
| Maximum Duty Cycle | 80% | % |
| Frequency Jittering Amplitude | ±4 to ±8% | % |
| No-Load Standby Power | < 30 mW | mW |
| Thermal Shutdown Temperature | 150°C | °C |
Key Features
- Fixed-frequency current-mode operation at 65 kHz.
- Frequency foldback and skip mode for maximized performance in light load and standby conditions.
- Timer-based overload protection with auto-recovery.
- High-voltage current source with brown-out detection and dynamic self-supply.
- Frequency modulation for softened EMI signature.
- Adjustable overpower protection dependent on the bulk voltage.
- Latch-off input combined with the overpower protection sensing input.
- VCC operation up to 28 V with overvoltage detection.
- 500/800 mA source/sink drive peak current capability.
- 10 ms soft-start.
- Internal thermal shutdown.
- No-load standby power < 30 mW.
- X2 capacitor in EMI filter discharging feature.
- Pb-free and halogen-free/BFR-free.
Applications
- AC-DC adapters for notebooks, LCD, and printers.
- Offline battery chargers.
- Consumer electronic power supplies.
- Auxiliary/housekeeping power supplies.
- Offline adapters for notebooks.
Q & A
- What is the operating frequency of the NCP1247DD065R2G? The operating frequency is 65 kHz.
- What type of overload protection does the NCP1247DD065R2G have? The NCP1247DD065R2G has auto-recovery overload protection.
- What is the maximum VCC power supply voltage for the NCP1247DD065R2G? The maximum VCC power supply voltage is 28 V.
- Does the NCP1247DD065R2G have thermal shutdown protection? Yes, it has internal thermal shutdown protection at 150°C.
- What is the no-load standby power consumption of the NCP1247DD065R2G? The no-load standby power consumption is less than 30 mW.
- Is the NCP1247DD065R2G Pb-free and halogen-free? Yes, it is Pb-free and halogen-free/BFR-free.
- What are the typical applications of the NCP1247DD065R2G? Typical applications include AC-DC adapters, offline battery chargers, consumer electronic power supplies, and auxiliary/housekeeping power supplies.
- How does the dynamic self-supply feature work in the NCP1247DD065R2G? The dynamic self-supply feature activates the internal startup current source to supply the controller during start-up, transients, latch, and standby, simplifying the design of the VCC circuitry.
- Does the NCP1247DD065R2G support frequency modulation for EMI reduction? Yes, it supports frequency modulation to soften the EMI signature.
- What is the purpose of the latch-off input in the NCP1247DD065R2G? The latch-off input allows the controller to be latched off, and it can be used with an NTC for over-temperature detection.
