NCP1027: High Voltage Switching Regulator for Offline SMPS
The NCP1027 offers a new solution targeting output power levels from a few watts up to 15W in a universal mains flyback application. Our proprietary high-voltage technology lets us include a power MOSFET together with a startup current source, all directly connected to the bulk capacitor. To prevent lethal runaway in low input voltage conditions, an adjustable brown-out circuitry blocks the activity until sufficient input level is reached.Current-mode operation together with an adjustable ramp compensation offers superior performance in universal mains applications.Protection wise, a timer detects an overload or a short-circuit and stops all operations, ensuring a safe auto-recovery, low duty cycle burst operation. An integrated, auto-recovery, Overvoltage Protection permanently monitors the VCC level and temporarily shuts down the driving pulses in case of an unexpected feedback loop runaway.Finally, a great RDS(on) figure makes the circuit an excellent choice for standby/auxiliary offline power supplies or applications requiring higher output power levels.
Features- Built-in 700 V MOSFET with Typical RDS(on) of 5.8 , Tj = 25C
- Current-Mode Fixed Frequency Operation: 65 & 100 kHz
- Fixed Peak Current of 800 mA
- Proprietary Skip-Cycle Operation at Low Peak Currents
- Internal Current Source for Clean and Lossless Startup Sequence
- Auto-Recovery Output Short Circuit Protection with Timer-Based Detection
- Auto-Recovery Overvoltage Protection with Auxiliary Winding Operation
- Programmable Brown-Out Input for Low Input Voltage Detection
- Input to Permanently Latchoff the Part
- Internal Frequency Jittering for Improved EMI Signature
- No-Load Input Standby Power of 85 mW @ 265 Vac
- 500 mW Loaded, Input Power of 715 mW @ 230 Vac
- Programmable Over Power Protection
|
Applications- Medium Power AC-DC Adapters for Chargers
- Auxiliary power supply
- Medium Power AC-DC power supply for CE apparatus
| End Products- Mpeg3 players
- Flat Tvs: LCD and Plasma
- Deskop PC, Server
- DVD, Set Top Box
|
Design & Development Tools (2)
Data Sheets (1)
Package Drawings (1)
Application Notes (9)
Evaluation Board Documents (9)
Simulation Models (2)
Evaluation/Development Tool Information
| Product | Status | Compliance | Short Description |
|---|
| NCP1027ATXGEVB | Active | Pb-free | 10 W Standby ATX Evaluation Board |
| NCP1910GEVB | Active | | PFC and LLC controller for ATX, Flat TV Power Conversion |
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| NCP1027P065G | Active | Pb-free
Halide free | PDIP-7 | 626A-01 | NA | Tube | 50 | $0.45 |
| NCP1027P100G | Active | Pb-free
Halide free | PDIP-7 | 626A-01 | NA | Tube | 50 | $0.45 |
Specifications
| Product | Control Mode | fsw Typ (kHz) | fJitter Typ (%) | Stand-by Mode | RDS(ON) Typ (Ω) | V(BR)DSS Max (V) | IPeak (mA) | HV Start-up Min (V) | DSS (mA) | UVLO | Short Circuit Protection | Over Power Compensation | Brown-out | Latch |
|---|
| NCP1027P065G | Current Mode | 65 | Yes | Yes | 5.6 | 700 | 800 | Yes | N/A | Yes | Yes | Yes | Yes | Yes |
| NCP1027P100G | Current Mode | 100 | Yes | Yes | 5.6 | 700 | 800 | Yes | N/A | Yes | Yes | Yes | Yes | Yes |
