CM1713S
product description
CM171XS is a high-performance switching power supply chip used in primary-side sampling and control. Its built-in power MOSFET can be used in offline switching power supply products within 24W. CM171XS adopts PFM control method when working in constant current mode, and adopts PWM+PFM control method when working in constant voltage mode, so that high-precision constant voltage and constant current control effects can be obtained without any secondary sampling and control circuits. . At the same time, the chip has a bottom opening function, which better optimizes system efficiency and EMI. CM171XS also has built-in input line voltage compensation and output cable compensation, so that a better voltage and current adjustment rate can be obtained. CM171XS has a large number of built-in compensation and protection functions, which simplifies the peripheral circuit, facilitates PCB layout and EMI design, improves the reliability of the solution, and reduces the cost of the solution.
main feature
• Primary side control does not require optocoupler and secondary control circuit
• PWM+PFM multi-mode mixed control
• AC working voltage range 175~264V
• Built-in 650V power MOSFET
• ±3% constant voltage accuracy and high constant current accuracy
• No-load power consumption in typical applications <75mW @230V
• Built-in soft start circuit
• Built-in output line compensation
• Built-in frequency jitter
• Built-in inductance compensation
• Ultra-low startup power consumption (< 5uA)
• Built-in over-current protection, over-voltage protection, short-circuit protection, over-temperature protection and other protection functions
• Cycle-by-cycle current limit
• Dynamic gate drive
• Applicable power <24W
Scope of application
• Travel charger & adapter
• Flyback converter
Related documents
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