CY3783B
product description
CY3783B is a high-performance switching power supply chip used in primary-side sampling and control. Its built-in power BJT can be used for offline switching power supply products within 12W. CY3783B adopts PFM control mode when working in constant current mode, and adopts PWM+PFM control mode 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, CY3783B also has built-in input line voltage compensation and output cable compensation, so that a better voltage and current adjustment rate can be obtained.
CY3783B 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
• Built-in 800V power BJT
• ±4% constant voltage accuracy and high constant current accuracy within the full voltage range
• No-load power consumption in typical applications <75mW @230V
• Built-in soft start circuit
• Built-in output line compensation
• Built-in frequency jitter
• 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 transistor base drive
• Applicable power 12W
• SOP7 package
Scope of application
• Mobile phone battery charger
• AC/DC power adapter and LED lighting
Related documents
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