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SP5712F
It is a high-precision offline switching power supply circuit, applied to low-power AC/DC chargers and adapters.
- Product Description
-
- Commodity name: SP5712F
- 封装: SOP7
- 品牌: Wuxi Silicon Power Microelectronics
It is a high-precision offline switching power supply circuit, applied to low-power AC/DC chargers and adapters.
SP5712 is a high-precision offline switching power supply circuit used in low-power AC/DC chargers and adapters. SP5712 uses primary-side sensing for precise constant current and constant voltage control, eliminating the need for optocouplers and TL431 typically used in such applications.
In constant current mode, the output power is set by the sampling resistor Rs connected to the CS pin. In constant voltage mode, the chip's various operating modes ensure high overall conversion efficiency. Additionally, the chip incorporates line voltage drop compensation, resulting in good load regulation. SP5712 operates in PFM mode under constant current and PWM mode under constant voltage, reducing frequency at light loads.
SP5712 provides power-on soft-start and various self-recoverable protection functions, including cycle-by-cycle current limiting (OCP), VDD overvoltage protection (OVP), VDD overvoltage clamping, and undervoltage lockout (UVLO). The SP5712's spread-spectrum function provides better EMI performance.
Typical Application Diagram
Features
• Constant voltage accuracy of 5% and constant current accuracy of 5% across the full voltage range
• Uses primary-side feedback control, eliminating the need for optocouplers and TL431
• Externally adjustable constant current value and output power
• Built-in primary-side feedback constant current control
• Built-in adaptive peak current control
• Built-in primary inductance compensation
• Enhanced line voltage drop compensation function, externally adjustable
• Power-on soft start
• Built-in leading edge blanking (LEB) function
• Cycle-by-cycle current limiting protection (OCP)
• Undervoltage lockout (UVLO), overvoltage protection (OVP), VDD voltage clamping protection
Applications
• Mobile phone chargers
• PDA and digital camera chargers
• Auxiliary power supplies for televisions and personal computers
• Replacement for linear regulators and RCC power supplies
Product Message
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