Q0265R High-Voltage Switcher for Offline SMPS IC Used
Description The NCP1027 (marked Q0265R on the package) is a High-Voltage Switcher IC manufactured by onsemi, designed for medium-power offline switch-mode power supplies (SMPS) featuring low standby…
Description
Description
The NCP1027 (marked Q0265R on the package) is a High-Voltage Switcher IC manufactured by onsemi, designed for medium-power offline switch-mode power supplies (SMPS) featuring low standby power. It targets output power levels from a few watts up to 15W in universal mains flyback applications, making it a popular choice for compact AC-DC adapters and auxiliary/standby power supplies.
Using onsemi's proprietary high-voltage technology, the NCP1027 integrates a power MOSFET together with a startup current source, both directly connected to the bulk capacitor — significantly reducing external component count compared to discrete flyback controller designs. To prevent lethal runaway under low input voltage conditions, it includes adjustable brown-out circuitry that blocks operation until a sufficient input level is reached. Current-mode operation combined with adjustable ramp compensation delivers strong performance across universal mains voltage ranges.
For protection, an internal timer detects overload or short-circuit conditions and stops operation, ensuring safe auto-recovery via low duty-cycle burst mode. An integrated, auto-recovery Overvoltage Protection (OVP) continuously monitors the VCC level and temporarily shuts down driving pulses if the feedback loop runs away — giving the design robust self-protection against common failure modes.
Key Specifications
- Function: High-voltage switching regulator (integrated power MOSFET) for offline SMPS
- Manufacturer: onsemi
- Package Marking: Q0265R
- Package: DIP-7 (through-hole)
- Target Output Power: Up to 15W (universal mains flyback)
- VCC Operating Range: ~7.9V–8.9V
- Output Voltage (internal MOSFET rating): 700V
- Integrated startup current source
- Brown-out protection, over-power protection, auto-recovery OVP and short-circuit protection
Common Applications
- Universal mains offline flyback power supplies
- Auxiliary/standby power supplies (e.g., ATX and TV power supplies)
- Low-power AC-DC adapters
- General offline SMPS designs requiring low standby power consumption
Package Includes
- 1 x NCP1027 IC
