NCP1288: Controller, Fixed Frequency, Current Mode, for Flyback Converters
The NCP1288 is a new generation of the NCP12xx fixed-frequency current-mode controllers featuring a high-voltage start-up current source, pin to pin compatible with the previous generation. Due to its proprietary Soft-Skip™ mode combined with frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. This Soft-Skip feature also dramatically reduces the risk of acoustic noise, which enables the use of inexpensive transformers and capacitors in the clamping network. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where ruggedness and components cost are the key constraints. In addition, the controller includes a new high voltage circuitry that combines a startup current source and a brown-out / line OVP detector able to sense the input voltage either from the rectified ac line or the dc filtered bulk voltage. Finally, due to a careful design, the precision of critical parameters is well controlled over the entire temperature range (-40°C to +125°C), enabling easier design and increased safety (e.g. ±5% for the peak current limit, ±7% for the oscillator).
Features- Timer-Based Overload Protection with AutoRecovery (Option B) or Latched (Option A) Operation
- Frequency Jittering
- Frequency Foldback transitioning into Soft-Skip
- High-Voltage Current Source with Built-in Brown-out and Line Overvoltage Protections
- Fixed-Frequency Current-Mode Operation with Built-in Ramp Compensation
- Adjustable Overpower Compensation
- Latch-off Input for Severe Fault Conditions, with Direct Connection of an NTC for Overtemperature Protection (OTP)
- Protection Against Winding Short-Circuit
- 65 kHz Oscillator (100 kHz and 133 kHz Versions Available Upon Request)
- VCC Operation up to 28 V
- Increased Precision on Critical Parameters
- ±1.0 A Peak Current Drive Capability
- 4.0 ms Soft-Start
- Internal Thermal Shutdown with Hysteresis
- These Devices are Pb-Free, Halogen Free/BFR free and are ROHS compliant
| Benefits- Overload protection independent of the auxiliary voltage
- Reduced EMI Signature
- Improved Performance in Standby
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Applications- Ac-dc Adapters for Notebooks, LCD, and Printers
- Offline Battery Chargers
- Consumer Electronic Power Supplies
- Auxiliary/Housekeeping Power Supplies
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Design & Development Tools (1)
Data Sheets (1)
Application Notes (2)
Package Drawings (1)
Order Information
| Product | Status | Compliance | Package | MSL* | Container | Budgetary Price/Unit |
|---|
| NCP1288BD65R2G | Active | Pb-free
Halide free | SOIC-7 | 751U | 1 | Tape and Reel | 2500 | $0.6667 |
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) |
|---|
| NCP1288BD65R2G | Flyback | Current Mode | 65 | Yes | 10 | Yes | Yes | Yes | 28 | 1000 / 1000 |
