Overview
The NCP1240AD100R2G is a fixed-frequency current-mode controller designed by onsemi, specifically tailored for flyback converters. This device integrates several advanced features to simplify the design of power supplies, ensuring high efficiency and robust performance. The NCP1240AD100R2G features a dynamic self-supply function, which simplifies the design of the auxiliary supply and VCC capacitor by activating an internal startup current source during startup, transients, and standby modes. It also includes a high-voltage detector for brown-out detection and X2 capacitor discharge, enhancing overall system reliability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Frequency | 100 kHz | - |
| Package Type | SOIC-7 | - |
| Maximum VCC Voltage | 28 V (continuous), 30 V (peak) | V |
| Maximum HV Pin Voltage | 500 V (continuous), 520 V (peak) | V |
| Drive Output Peak Current | 500/800 mA | mA |
| Soft-Start Time | 10 ms | ms |
| No-Load Standby Power | < 30 mW | mW |
| Overload Protection | Latched | - |
| Thermal Shutdown | Internal | - |
Key Features
- Fixed-frequency current-mode operation with options for 65 kHz and 100 kHz frequencies.
- Frequency foldback and skip mode for optimized performance in light load and standby conditions.
- Timer-based overload protection with latched or auto-recovery operation.
- 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 overpower protection sensing input.
- Internal thermal shutdown and soft-start capability.
- X2 capacitor discharge feature in EMI filter.
- Pb-free and halogen-free/BFR-free packaging.
Applications
- AC-DC adapters for notebooks, LCDs, and printers.
- Offline battery chargers.
- Consumer electronic power supplies.
- Auxiliary/housekeeping power supplies.
- Offline adapters for notebooks.
Q & A
- What is the primary function of the NCP1240AD100R2G?
The NCP1240AD100R2G is a fixed-frequency current-mode controller designed for flyback converters, ensuring efficient and robust power supply designs.
- What are the available operating frequencies for the NCP1240AD100R2G?
The device operates at either 65 kHz or 100 kHz frequencies.
- What is the maximum voltage rating for the VCC pin?
The maximum continuous voltage rating for the VCC pin is 28 V, with a peak voltage of 30 V.
- How does the device handle overload protection?
The device features timer-based overload protection, available in both latched and auto-recovery modes.
- What is the purpose of the dynamic self-supply function?
The dynamic self-supply function simplifies the design of the auxiliary supply and VCC capacitor by activating an internal startup current source during startup, transients, and standby modes.
- Does the NCP1240AD100R2G have thermal shutdown protection?
Yes, the device includes internal thermal shutdown protection.
- What is the no-load standby power consumption of the NCP1240AD100R2G?
The no-load standby power consumption is less than 30 mW.
- Can the NCP1240AD100R2G be used in consumer electronic power supplies?
Yes, it is suitable for consumer electronic power supplies among other applications.
- Is the NCP1240AD100R2G Pb-free and halogen-free/BFR-free?
Yes, the device is Pb-free and halogen-free/BFR-free.
- What is the purpose of the X2 capacitor discharge feature?
The X2 capacitor discharge feature is part of the EMI filter, ensuring proper discharge of the X2 capacitor.
