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Off-Line Digital Green-Mode Quasi-Resonant PWM Controller
● Optimized for 5V2A AC/DC adapters/chargers with< 30mW no-load power consumption at 230VAC and
fast dynamic load response for both one-time and repetitive load transients
● Direct drive of low-cost BJT power switch
● Very tight constant voltage and constant current regulation over entire operating range
● PrimAccurateTM primary-side feedback eliminates opto-isolators and simplifies design
● EZ-EMI® design enhances manufacturability
● Intrinsically low common mode noise
● Optimized 72kHz maximum PWM switching frequency achieves best size and efficiency
● Adaptive multi-mode PWM/PFM control improves efficiency
● Quasi-resonant operation for highest overall efficiency
● Dynamic base current control
● No external loop compensation components required
● Complies with EPA 2.0/CoC Ver5/DoE energyefficiency
specifications with ample margin
● Built-in protections for output short-circuit, output low
impedance, and output overvoltage
● Built-in over-temperature protection (OTP)
● No audible noise over entire operating range
Applications:
● Compact AC/DC adapters/chargers for media tablets
and smart phones
● AC/DC adapters for consumer electronics
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