Overview
The NCP1566MNTXG is a highly integrated dual-mode active clamp PWM controller developed by onsemi. This controller is designed for next-generation high-density, high-performance, and small to medium power level isolated DC-DC converters, particularly in telecom and datacom applications. It operates up to 1 MHz and can be configured in either voltage mode control with input voltage feedforward or peak current mode control. The NCP1566MNTXG integrates all necessary control and protection functions to implement isolated active-clamp forward or asymmetric half-bridge converters with synchronous rectification. It also features a high-voltage startup bias regulator capable of handling up to 120 V DC input.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 6.5 | - | 20 | V |
| Main Driver Maximum Voltage (VOUTM) | -0.3 | - | VCC | V |
| Main Driver Maximum Current (IOUTM) | - | - | 2 A (Source), 3 A (Sink) | A |
| Active Clamp Driver Maximum Voltage (VOUTA) | -0.3 | - | VCC | V |
| Active Clamp Driver Maximum Current (IOUTA) | - | - | 2 A (Source), 1 A (Sink) | A |
| Oscillator Frequency Range | 100 kHz | - | 1 MHz | kHz |
| Maximum Operating Junction Temperature (TJ) | -40 | - | 150 | °C |
| Storage Temperature Range (TSTG) | -60 | - | 150 | °C |
Key Features
- Support for voltage mode control and peak current mode control with input voltage feedforward.
- Adjustable adaptive overlap time for improved efficiency.
- Integrated 120-V high-voltage startup circuit with self-supply operation.
- Line undervoltage lockout (UVLO) with adjustable hysteresis.
- Cycle-by-cycle peak current limiting and adjustable over-power protection.
- Overcurrent protection based on average current and short circuit protection.
- Programmable maximum duty ratio clamp and programmable soft-start.
- External over-temperature protection using a thermistor.
- Over-voltage protection through a dedicated pin.
- Dual-function FLT/SD pin for fault reporting and shutdown.
- Programmable oscillator with synchronization capability.
- 5 V / 2% voltage reference.
Applications
- High-efficiency isolated DC-DC converters.
- Server power supplies.
- 24 V and 48 V telecom systems.
- 42 V automotive applications.
Q & A
- What are the primary modes of operation for the NCP1566MNTXG?
The NCP1566MNTXG can operate in either voltage mode control with input voltage feedforward or peak current mode control.
- What is the maximum operating frequency of the NCP1566MNTXG?
The maximum operating frequency is up to 1 MHz.
- What is the purpose of the high-voltage startup bias regulator?
The high-voltage startup bias regulator is capable of handling up to 120 V DC input and provides self-supply operation.
- What protection features are integrated into the NCP1566MNTXG?
The controller includes line undervoltage lockout, cycle-by-cycle peak current limiting, overcurrent protection, short circuit protection, over-voltage protection, and external over-temperature protection.
- How does the adaptive overlap time feature improve system efficiency?
The adjustable adaptive overlap time optimizes system efficiency based on input voltage and load conditions.
- What is the function of the FLT/SD pin?
The FLT/SD pin is a dual-function pin used for communicating the presence of a fault and for shutting down the controller.
- What is the maximum duty ratio limit for the NCP1566MNTXG?
The maximum duty ratio can be programmed using an external resistor connected to the DLMT pin.
- How does the synchronization pin function?
The synchronization pin eases operations when associating bricks together and allows for synchronization of multiple controllers.
- What is the thermal shutdown temperature for the NCP1566MNTXG?
The thermal shutdown temperature is 150°C with a hysteresis of 20°C.
- Is the NCP1566MNTXG Pb and Halogen free?
Yes, the NCP1566MNTXG is a Pb and Halogen free device.
