NCP1238 Description
NCP1238 Fixed Frequency Current Mode Controller for Flyback Converters The NCP1238 is a new generation of the NCP12xx fixed−frequency current−mode controllers featuring Dynamic Self−Supply (DSS), pin−to−pin patible with the previous generation. The DSS function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during...
NCP1238 Key Features
- Timer-Based Overload Protections with Auto
- Frequency Jittering for a Reduced EMI Signature
- Adjustable Overpower pensation
- Protection Against Winding Short-Circuit
- 65 kHz Oscillator (100 kHz and 133 kHz Versions
- VCC Operation up to 28 V
- Increased Precision on Critical Parameters
- ±1.0 A Peak Drive Capability
- 4.0 ms Soft-Start
- Internal Thermal Shutdown with Hysteresis
NCP1238 Applications
- ac−dc Adapters for Notebooks, LCD, and Printers