Overview
The NCP1246BLD065R2G is a fixed-frequency current-mode controller designed for flyback converters, manufactured by ON Semiconductor. This device is part of the NCP1246 series and is specifically configured for a 65 kHz switching frequency. It features advanced functionalities such as dynamic self-supply, high-voltage current source, and brown-out detection, making it an excellent choice for robust power supply designs. The controller includes various protection mechanisms, including timer-based overload protection, adjustable overpower protection, and internal thermal shutdown, ensuring reliable and efficient operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Switching Frequency | 65 kHz | |
| VCC Power Supply Voltage | -0.3 to 28 V (continuous), ±30 V (peak) | V |
| Maximum Voltage on HV Pin | -0.3 to 500 V (DC), ±20 V (peak) | V |
| Maximum Voltage on DRV Pin | -0.3 to 20 V (DC), ±1000 mA (peak) | V |
| Source/Sink Drive Peak Current Capability | 500/800 mA | mA |
| Soft-Start Time | 10 ms (AL/BL Versions: 4 ms) | ms |
| No-Load Standby Power | < 30 mW | mW |
| Internal Thermal Shutdown | Yes | |
| X2 Capacitor Discharging Feature | Yes | |
| RoHS Compliance | Pb-Free, Halogen Free/BFR Free |
Key Features
- Fixed-frequency current-mode operation (65 kHz and 100 kHz options)
- Frequency foldback and skip mode for maximized performance in light load and standby conditions
- Timer-based overload protection with latched (Option A) or auto-recovery (Option B) 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 the overpower protection sensing input
- VCC operation up to 28 V with overvoltage detection
- Internal thermal shutdown
- X2 capacitor in EMI filter discharging feature
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 switching frequency of the NCP1246BLD065R2G?
The switching frequency of the NCP1246BLD065R2G is 65 kHz.
- What is the maximum voltage on the VCC pin?
The maximum voltage on the VCC pin is 28 V (continuous) with ±30 V (peak).
- Does the NCP1246BLD065R2G have internal thermal shutdown?
Yes, the NCP1246BLD065R2G includes internal thermal shutdown protection.
- What is the no-load standby power consumption of the NCP1246BLD065R2G?
The no-load standby power consumption is less than 30 mW.
- Is the NCP1246BLD065R2G RoHS compliant?
Yes, the NCP1246BLD065R2G is Pb-Free, Halogen Free/BFR Free and RoHS compliant.
- What are the typical applications of the NCP1246BLD065R2G?
Typical applications include AC-DC adapters, offline battery chargers, consumer electronic power supplies, auxiliary/housekeeping power supplies, and offline adapters for notebooks.
- Does the NCP1246BLD065R2G support frequency foldback and skip mode?
Yes, it supports frequency foldback and skip mode for maximized performance in light load and standby conditions.
- How does the NCP1246BLD065R2G handle overload protection?
The NCP1246BLD065R2G features timer-based overload protection with either latched (Option A) or auto-recovery (Option B) operation.
- What is the purpose of the dynamic self-supply feature in the NCP1246BLD065R2G?
The dynamic self-supply feature simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during start-up, transients, latch, and stand-by.
- Does the NCP1246BLD065R2G have a built-in X2 capacitor discharging feature?
Yes, it includes an X2 capacitor discharging feature in the EMI filter.
