Overview
The NCP1380DDR2G is a high-performance quasi-resonant current-mode controller designed by onsemi. This device is specifically tailored for powering quasi-resonant converters, leveraging a proprietary valley lockout system. This system ensures stable operation by adjusting the switching frequency based on the power load, reducing it as the load becomes lighter. The controller operates down to the 4th valley and then switches to a variable frequency mode, enhancing standby power performance. It also includes Over Power Protection (OPP) and a fixed internal timer for fault detection, providing robust safety features.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCC Maximum Voltage | -0.3 to 28 | V |
| Maximum Current for VCC Pin | ±30 | mA |
| Maximum Driver Pin Voltage | -0.3 to 20 | V |
| Maximum Current for DRV Pin | ±1000 | mA |
| Maximum Voltage on Low Power Pins (except DRV and VCC) | -0.3 to 10 | V |
| Current Range for Low Power Pins (except ZCD, DRV, and VCC) | ±10 | mA |
| Maximum Current for ZCD Pin | +3 / -2 | mA |
| Thermal Resistance Junction-to-Air | 120 | °C/W |
| Maximum Junction Temperature | 150 | °C |
| Operating Temperature Range | -40 to +125 | °C |
| Storage Temperature Range | -60 to +150 | °C |
| ESD Capability, HBM Model | 4 kV | |
| Package Type | SOIC-8 | |
| Peak Current Source/Sink Capability | +500 mA / -800 mA |
Key Features
- Quasi-resonant peak current-mode control operation
- Valley switching operation with valley-lockout for noise-immune operation
- Frequency foldback at light load to improve light load efficiency
- Adjustable over power protection
- Auto-recovery or latched internal output short-circuit protection
- Fixed internal 80 ms timer for short-circuit protection
- Combined overvoltage and overtemperature protection (versions A and B)
- Combined overvoltage protection and brown-out (versions C and D)
- Internal temperature shutdown
- Direct optocoupler connection
- Extended VCC range operation up to 28 V
- Extremely low no-load standby power
- Pb-free and RoHS compliant
Applications
- AC-DC adapters for notebooks
- Offline battery chargers
- Auxiliary power supplies (flat TVs, appliances)
- Power AC-DC converters for adapters, TVs, and set-top boxes
- High power AC-DC converters for TVs, set-top boxes, etc.
Q & A
- What is the primary function of the NCP1380DDR2G?
The NCP1380DDR2G is a quasi-resonant current-mode controller designed to power quasi-resonant converters.
- How does the valley lockout system work?
The valley lockout system adjusts the switching frequency based on the power load, reducing it as the load becomes lighter and ensuring stable operation down to the 4th valley.
- What safety features does the NCP1380DDR2G include?
The controller includes Over Power Protection (OPP), a fixed internal timer for fault detection, combined overvoltage and overtemperature protection (versions A and B), and combined overvoltage protection and brown-out (versions C and D).
- What is the maximum voltage for the VCC pin?
The maximum voltage for the VCC pin is 28 V.
- What is the peak current source/sink capability of the NCP1380DDR2G?
The peak current source/sink capability is +500 mA / -800 mA.
- What is the operating temperature range for the NCP1380DDR2G?
The operating temperature range is -40°C to +125°C.
- Is the NCP1380DDR2G Pb-free and RoHS compliant?
- What types of applications is the NCP1380DDR2G suited for?
The controller is suited for AC-DC adapters, offline battery chargers, auxiliary power supplies, and high power AC-DC converters.
- How does the frequency foldback feature improve efficiency?
The frequency foldback feature reduces the switching frequency at light loads, improving light load efficiency.
- What is the purpose of the fixed internal 80 ms timer?
The fixed internal 80 ms timer is used for short-circuit protection.
