LD5556K1Quasi-Resonant PWM Controller of Flyback with Frequency Swapping and Integrated Protection
The LD5556K1 integrates a quasi-resonant PWM control function into a SOT-26 package. It takes less components counts or circuit space, especially ideal for those total solutions of low cost.
The implemented functions include low startup current, green-mode power-saving operation, leading-edge blanking of the current sensing and internal soft driving. It also features more protections like Over Power Protection (OPP), Over Current Protection (OCP), Over Voltage Protection (OVP), Output Short Circuit Protection (OSCP) and internal Over Temperature Protection (OTP). Furthermore, the programmable brown-in/out protection is built-in.
Furthermore, the QR jitter function could reduce the noise level and thus helps the power circuit designers to easily deal with the EMI filter by spending minimum amount of component cost and developing time.
Features
- Low Startup Current (<1mA)
- 0.42mA Ultra-low operating current at light load
- Green Mode Control
- VCC Ratting around 85V
- Smart stabilization system and high efficiency for USB-PD App
- VCC OVP (Over Voltage Protection)
- Adj. OVP (Over Voltage Protection) on FB pin.
- OPP (Over Power Protection)
- External OTP / FB OVP
- Internal OTP (Over Temperature Protection)
- SDSP (Secondary Diode Short Protection)
- Accurate LPS Protections ± 8%
Applications
- Switching AC/DC Adaptor
