LD7539RMulti-Mode PWM Controller of Flyback with Integrated BNI/BNO and Protection
The LD7539R is built-in with several functions, protection and EMI-improved solution in a tiny 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 slope compensation. It also features more protections like BNO (Brownout), OTP (Over Temperature Protection), OLP (Over Load Protection) and OVP (Over Voltage Protection) to prevent circuit from any damage under abnormal conditions.
Furthermore, the Frequency Swapping function is to reduce the noise level and thus helps the power circuit designers to easily deal with the EMI filter design by spending minimum amount of component cost and developing time.
Features
- High-Voltage CMOS Process with Excellent ESD protection
- Very Low Startup Current (<14mA)
- Green Mode Control
- UVLO (Under Voltage Lockout)
- LEB (Leading-Edge Blanking) on CS Pin
- Internal Frequency Swapping
- Internal Slope Compensation
- AC Input BNO (Brownout) Protection
- OVP (Over Voltage Protection) on Vcc Pin
- Adjustment OVP(Over Voltage Protection) on CS Pin
- Adjustment OCP(Over Current Protection) on CS Pin
- OTP (Over Temperature Protection) through a NTC
- OLP (Over Load Protection)
- 250/-500mA Driving Capability
Applications
- Switching AC/DC Adaptor and Battery Charger
- Open Frame Switching Power Supply
