General Description
The LD7670J integrated a 650V power MOSFET and a current mode PWM controller in a DIP-8 package. It’s operating at fixed frequency of 65 kHz. It provides important functions required for low output power applications such as leading-edge blanking of the current sensing, internal slope compensation, and green-mode power-saving operation under light load or no load condition. This highly integrated device provides the users with a high efficiency, low external component counts, and low cost solution for low power adaptors or charger applications.
The special green-mode control is not only to achieve the low power consumption but also to offer a non-audible-noise operation when the LD7670J is operating under light load or no load condition.
Features
• Built-in 650V/2A Power MOSFET
• Secondary-side/Primary-side feedback control
• Switching Frequency at 65KHz
• Fixed Internal Frequency Trembling
• Built-in Load Regulation Compensation
• Built-in Slope Compensation with 75% max duty-cycle
• Low Startup Current (<20μA)
• Current Mode Control with Cycle-by-Cycle Current Limit
• Non-audible-noise Green Mode Control
• UVLO (Under Voltage Lockout)
• LEB (Leading-Edge Blanking) on CS Pin
• OVP (Over Voltage Protection) on Vcc
• OLP (Over Load Protection)
Applications
• Switching AC/DC Adaptor
• LCD TV or PC Standby Power
Typical Application
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