NCP1028: High Voltage Switching Regulator for Offline SMPS
The NCP1028 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.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- Skips cycles on low power demand
- Short circuit protection independent of the AUX winding
- Overpower protection
- Built-in 700 V MOSFET with Typical RDS(on) of 5.8 , Tj = 25C
- Fixed Peak Current of 800 mA
- Internal Current Source for Clean and Lossless Startup Sequence
- 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
- Medium Power AC-DC power supply for CE apparatus
| Benefits- Provides improved efficiency at light loads No acoustic noise
- Efficient protective circuitry Ease the design
- Effect of the input voltage variation on the max power delivered is compensated
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Applications- Medium Power AC-DC Adapters for Chargers
- Auxiliary power supply
| End Products- Desktop PC
- Flat TVs
- DVD, STB
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Design & Development Tools (2)
Data Sheets (1)
Package Drawings (1)
Application Notes (6)
Evaluation Board Documents (4)
Simulation Models (2)
Evaluation/Development Tool Information
| Product | Status | Compliance | Short Description |
|---|
| NCP1028LEDGEVB | Active | Pb-free | 720 mA 18 V LED Driver Evaluation Board |
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| NCP1028P065G | Active | Pb-free
Halide free | PDIP-7 | 626A-01 | NA | Tube | 50 | $0.48 |
| NCP1028P100G | Active | Pb-free
Halide free | PDIP-7 | 626A-01 | NA | Tube | 50 | $0.48 |
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 |
|---|
| NCP1028P065G | Current Mode | 65 | Yes | Yes | 5.6 | 700 | 800 | Yes | N/A | Yes | Yes | Yes | Yes | No |
| NCP1028P100G | Current Mode | 100 | Yes | Yes | 5.6 | 700 | 800 | Yes | N/A | Yes | Yes | Yes | Yes | No |
