C2173

C2173 Datasheet Primary Side Sensing SMPS Controller KEY FEATURES AND ADVANTAGES Advanced primary sensing control circuitry achieves accurate voltage and current (CV and CC) regulation Bipolar junction transistor (BJT) primary switch enables ultra low BOM cost design solutions Fast start-up performance without additional active components for low BOM cost Adaptive base and emitter switching extends RBSOA Less than 30 mW no-load power with less than one second turn-on delay and class leading load-transient performance Output transient detection (TD) function for very low no-load power applications Optimised PWM/PFM with quasi resonant switching enables efficiency standards compliance with margin Frequency dithering algorithm allows EMI compliance with margin Enables fully compliant solutions for “MoU” universal USB chargers o o Optimised control of the primary switch drive for low EMI and compliance to EN 301 489-34 Inherently low ripple and low EMI enable compliance with the interoperability standard, IEC 62684 C2173 SOT23-6 Full featured protection includes o Single fault o Output over-voltage and short-circuit o Input under-voltage Convenient SOT23-6 surface mount package for small size and low cost manufacture APPLICATIONS Universal input mobile phones chargers typically to 8 W, including “universal” USB and all major OEM specifications. Universal input adapters and standby/auxiliary power supplies typically to 8 W. + + + C2173 Q1 BD CS ED Output ...