Overview
The NCP1294EDBR2G is a fixed frequency voltage mode PWM controller designed by onsemi. This device is optimized for high frequency primary side control operation and is suitable for flyback, boost, or forward converter topologies. It features a low startup current of less than 50 μA and includes various protection mechanisms such as overvoltage, undervoltage, and thermal shutdown. The controller is available in a 16-lead TSSOP surface mount package, making it compact and suitable for a wide range of power management applications.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Start Threshold | 4.4 | 4.6 | 4.7 | V |
| Stop Threshold | 3.2 | 3.8 | 4.1 | V |
| Reference Voltage | 3.2 | 3.3 | 3.4 | V |
| Oscillator Frequency | 260 | 273 | 320 | kHz |
| Gate Drive Current | 1.0 | - | 1.5 | A |
| Thermal Shutdown | 125 | - | 150 | °C |
| Supply Voltage (VCC) | 4.7 | - | 15 | V |
| Switching Frequency | - | 1000 | - | kHz |
Key Features
- 1.0 MHz frequency capability
- Fixed frequency voltage mode operation with feed forward
- Soft-Start with programmable duration
- Accurate programmable maximum duty cycle limit
- 1.0 A sink/source gate drive
- Programmable pulse-by-pulse overcurrent protection
- Leading edge current sense blanking
- Undervoltage and overvoltage protection with programmable hysteresis
- Bidirectional synchronization
- Thermal shutdown with hysteresis
- 3.3 V reference voltage output
- Pb-free, halogen-free/BFR-free, and RoHS compliant
Applications
- Flyback, boost, and forward converter topologies
- Solar power battery chargers
- Maximum Peak Power Tracking (MPPT) systems
- Offline power supplies
- High-frequency power management systems
Q & A
- What is the typical switching frequency of the NCP1294EDBR2G?
The typical switching frequency is 1 MHz (1000 kHz).
- What is the startup current of the NCP1294EDBR2G?
The startup current is less than 50 μA.
- What protection mechanisms are included in the NCP1294EDBR2G?
The device includes undervoltage protection, overvoltage protection, thermal shutdown, and programmable pulse-by-pulse overcurrent protection.
- What is the gate drive capability of the NCP1294EDBR2G?
The gate drive capability is 1.0 A sink/source.
- Can the NCP1294EDBR2G be synchronized with external signals?
- What is the reference voltage output of the NCP1294EDBR2G?
The reference voltage output is 3.3 V.
- What package types are available for the NCP1294EDBR2G?
The device is available in SOIC-16 and TSSOP-16 surface mount packages).
- Is the NCP1294EDBR2G RoHS compliant?
- How does the Soft-Start feature work in the NCP1294EDBR2G?
The Soft-Start feature gradually releases the clamp on the duty cycle during power-up to eliminate in-rush current, and its duration can be programmed through a capacitance connected to the SS pin).
- What is the thermal shutdown temperature of the NCP1294EDBR2G?
The thermal shutdown temperature is between 125°C and 150°C).
