NCP1271: PWM Controller, Soft-Skip™ Standby, with Adjustable Skip Level and External Latch
The NCP1271 represents a new, pin to pin compatible, generation of the successful 7 pin current mode NCP12XX product series. The controller allows for excellent stand by power consumption by use of its adjustable Soft Skip mode and integrated high voltage startup FET. This proprietary Soft Skip also dramatically reduces the risk of acoustic noise. This allows the use of inexpensive transformers and capacitors in the clamping network. Internal frequency jittering, ramp compensation, timer based fault detection and a latch input make this controller an excellent candidate for converters where ruggedness and component cost are the key constraints.
Features- Short Circuit Protection Independent of the Auxiliary Winding
- Adjustable Soft Skip Mode
- Internal High-Voltage Start-up
- 5% Current Limit Accuracy over the Full Temperature Range
- Internal Latch for Easy Implementation of Overvoltage and Overtemperature Protection
- Frequency Jittering for Softened EMI Signature
- +500 mA/800 mA Peak Current Drive Capability
| Benefits- Efficient protective circuitry
- Provides improved efficiency at light loads and reduces the acoustic noise
- Clean and loss less start-up sequence and reduces component count
|
Applications- ACDC Adapters
- Consumer Electronic Power Supplies
| End Products- Offline Battery Chargers
- STB, DVD, DVDR
- Notebooks
- LCD Monitors
- Printers
|
Design & Development Tools (2)
Package Drawings (2)
Application Notes (3)
Evaluation Board Documents (5)
Data Sheets (1)
Evaluation/Development Tool Information
| Product | Status | Compliance | Short Description |
|---|
| NCP1271ADAPGEVB | Active | Pb-free | 57 W Adapter Evaluation Board |
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| NCP1271D100R2G | Active | Pb-free
Halide free | SOIC-7 | 751U | 1 | Tape and Reel | 2500 | $0.25 |
| NCP1271D65R2G | Active | Pb-free
Halide free | SOIC-7 | 751U | 1 | Tape and Reel | 2500 | $0.25 |
| NCP1271P100G | Active | Pb-free
Halide free | PDIP-8 | 626B | NA | Tube | 50 | $0.46 |
| NCP1271P65G | Active | Pb-free
Halide free | PDIP-8 | 626B | NA | Tube | 50 | $0.6133 |
Specifications
| Product | Topology | Control Mode | fsw Typ (kHz) | Stand-by Mode | UVLO (V) | Short Circuit Protection | Latch | Soft Start | VCC Max (V) | Drive Cap. (mA) |
|---|
| NCP1271D100R2G | Flyback | Current Mode | 100 | Yes | Yes | Yes | Yes | Yes | 20 | 500 / 800 |
| NCP1271D65R2G | Flyback | Current Mode | 65 | Yes | Yes | Yes | Yes | Yes | 20 | 500 / 800 |
| NCP1271P100G | Flyback | Current Mode | 100 | Yes | Yes | Yes | Yes | Yes | 20 | 500 / 800 |
| NCP1271P65G | Flyback | Current Mode | 65 | Yes | Yes | Yes | Yes | Yes | 20 | 500 / 800 |
