Overview
The NCP12700BDNR2G is a fixed frequency, peak current mode PWM (Pulse Width Modulation) controller produced by onsemi. This device is designed to implement single-ended power converter topologies, including CCM (Continuous Conduction Mode) and DCM (Discontinuous Conduction Mode) flyback and forward converters. It features a high voltage startup regulator, a programmable oscillator, and a suite of protection features, making it suitable for a wide range of applications such as telecommunications, industrial power converter modules, and more.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| High Voltage Startup Voltage | 120 | V |
| High Voltage Startup Current | 50 | mA |
| Supply Voltage | -0.3 to 30 | V |
| Supply Current | 50 | mA |
| DRV Voltage | -0.3 to VDRV(high) | V |
| DRV Current (Peak) | 3.25 | A |
| FLT Voltage | VCC + 1.25 | V |
| FLT Current | 10 | mA |
| Max Voltage on Signal Pins | -0.3 to 5.5 | V |
| Max Current on Signal Pins | 10 | mA |
| Operating Temperature Range | -40 to 125 | °C |
| Oscillator Frequency Range | 100 kHz to 1 MHz | |
| DRV Rise Time | 6 to 15 | ns |
| DRV Fall Time | 2.5 to 10 | ns |
| DRV Source Current | 1.0 | A |
| DRV Sink Current | 2.8 | A |
Key Features
- Ultra-Wide Input Range: The device operates over an input voltage range of 9 – 120 V (xDNR2G) or 9 – 200 V (xMTTXG).
- High Voltage Startup Regulator: Capable of supplying at least 15 mA to provide temporary bias to VCC during system startup.
- Programmable Oscillator: Operates from 100 kHz to 1 MHz.
- Integrated Slope Compensation: Prevents subharmonic oscillations.
- Adjustable Soft-Start: User-adjustable soft-start ramp.
- Input Voltage UVLO Protection: With hysteresis and shutdown threshold for external disable.
- Protection Features: Includes cycle-by-cycle peak current limiting, timer-based overload protection, NTC-compatible fault interface for thermal protection, and output over-voltage protection.
- Gate Driver: 1 A / 2.8 A source / sink gate driver.
- Low Quiescent State: Skip cycle mode for low standby power and fault auto-recovery mode).
Applications
- Single-Ended Power Converters: Including CCM/DCM flyback and forward converters).
- Telecommunications Power Converters: Suitable for telecom applications).
- Industrial Power Converter Modules: With isolation, used in various industrial applications).
- Medical and Transportation Applications: Due to its wide input voltage range and robust protection features).
Q & A
- What is the input voltage range of the NCP12700BDNR2G?
The input voltage range is 9 – 120 V for the xDNR2G package and 9 – 200 V for the xMTTXG package).
- What is the maximum supply voltage for the NCP12700BDNR2G?
The maximum supply voltage is 30 V).
- What is the oscillator frequency range of the NCP12700BDNR2G?
The oscillator frequency range is from 100 kHz to 1 MHz).
- Does the NCP12700BDNR2G have built-in slope compensation?
Yes, it integrates slope compensation to prevent subharmonic oscillations).
- What are the key protection features of the NCP12700BDNR2G?
The device includes cycle-by-cycle peak current limiting, timer-based overload protection, NTC-compatible fault interface for thermal protection, and output over-voltage protection).
- How does the soft-start feature work on the NCP12700BDNR2G?
The soft-start feature is user-adjustable, allowing for a controlled ramp-up of the output voltage during startup).
- What is the purpose of the FLT pin on the NCP12700BDNR2G?
The FLT pin can be interfaced with an NTC and an auxiliary winding to provide system thermal protection and output over-voltage protection).
- Can the NCP12700BDNR2G be disabled externally?
Yes, the UVLO pin features a shutdown comparator that allows for an external signal to disable switching and bring the controller into a low quiescent state).
- What is the maximum DRV current of the NCP12700BDNR2G?
The maximum DRV current is 3.25 A (peak)).
- Does the NCP12700BDNR2G support auto-recovery from fault mode?
Yes, the device has a fault auto-recovery mode with a 1-second auto-recovery period).
