Overview
The NCP1399AHDR2G is a high-performance current mode controller designed for half-bridge resonant converters, manufactured by onsemi. This controller is optimized for high-frequency operation, ranging from 20 kHz to 750 kHz, and features a robust set of protection mechanisms and control schemes to ensure efficient and reliable operation.
Key aspects of the NCP1399AHDR2G include its high-voltage startup current source, dynamic self-supply (DSS) operation, and advanced protection features such as over-current, over-voltage, and over-temperature protection. The controller also supports skip-mode and off-mode operations to enhance efficiency under light load conditions.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Operating Frequency | kHz | 20 | - | 750 |
| VCC Turn-on Threshold | V | 10 | 11.5 | 15.3 |
| VCC Minimum Operating Voltage | V | 9.0 | 9.5 | 10 |
| VCC Reset Threshold | V | 5.8 | 6.6 | 7.2 |
| Startup Current (I_START1) | mA | 0.2 | 0.5 | 0.8 |
| Startup Current (I_START2) | mA | 6 | 9 | 13 |
| Off-state Leakage Current (I_START_OFF) | mA | - | - | 10 |
| Output Voltage Rise Time (tr) | ns | 20 | - | 80 |
| Output Voltage Fall Time (tf) | ns | 20 | - | 80 |
Key Features
- High-Frequency Operation: Supports frequencies from 20 kHz to 750 kHz.
- Current Mode Control Scheme: Ensures best transient response performance and inherent cycle-by-cycle over-current protection.
- High-Voltage Startup Current Source: Enables fast startup time and extremely low standby power consumption.
- Dynamic Self-Supply (DSS) Operation: Maintains IC bias in off-mode or fault modes.
- Advanced Protection Features: Includes over-current, over-voltage, over-temperature, and secondary short circuit protection.
- Skip-Mode and Off-Mode Operations: Enhances efficiency under light load conditions.
- PFC Stage Operation Control: Allows disabling or enabling PFC stage operation based on application operating state.
- Automatic Dead-Time Adjustment: Ensures optimal switching performance.
- Quiet Skip Operation Mode: Minimizes transformer acoustic noise.
Applications
- Adapters and Offline Battery Chargers: Suitable for high-efficiency power conversion in charging applications.
- Flat Panel Display Power Converters: Ideal for powering display systems with high reliability and efficiency.
- Computing Power Supplies: Used in power supplies for computers and other computing devices.
- Industrial and Medical Power Sources: Reliable operation in industrial and medical equipment power supplies.
Q & A
- What is the operating frequency range of the NCP1399AHDR2G?
The NCP1399AHDR2G operates within a frequency range of 20 kHz to 750 kHz.
- What is the purpose of the high-voltage startup current source in the NCP1399AHDR2G?
The high-voltage startup current source enables fast startup time and extremely low standby power consumption.
- What protection features are included in the NCP1399AHDR2G?
The controller includes over-current, over-voltage, over-temperature, and secondary short circuit protection.
- How does the NCP1399AHDR2G manage light load conditions?
The controller supports skip-mode and off-mode operations to enhance efficiency under light load conditions.
- What is the role of the PFC MODE pin in the NCP1399AHDR2G?
The PFC MODE pin allows disabling or enabling PFC stage operation based on the application operating state.
- How does the NCP1399AHDR2G handle over-temperature conditions?
The controller features over-temperature protection to prevent IC damage and can enter latched or auto-recovery protection mode depending on the IC option.
- What is the significance of the dynamic self-supply (DSS) operation in the NCP1399AHDR2G?
The DSS operation maintains the IC bias in off-mode or fault modes, ensuring that the actual operation state is memorized.
- How does the NCP1399AHDR2G protect against secondary short circuits?
The controller implements a dedicated secondary side short circuit protection system that shuts down the controller quickly to limit stress on power stage components.
- What is the typical application of the NCP1399AHDR2G in computing power supplies?
The NCP1399AHDR2G is used in power supplies for computers and other computing devices to ensure high efficiency and reliability.
- How does the NCP1399AHDR2G ensure high noise immunity?
The controller uses digital processing with a minimum on-time resolution of 10 ns to ensure high noise immunity.
