MB3873

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27223-1E ASSP For Power Supply Applications Multi-Resonance AC/DC Converter IC MB3873 s DESCRIPTION The MB3873 is a pulse frequency modulation (PFM) type multi-resonance AC/DC converter IC providing soft switching functions in a more compact, higher-efficiency, low-noise package. Since this product allows reduced number of the components and reduced size of the transformer, it is also compatible with the miniaturization of AC adaptor. The product retains the multi-resonance for the non-load, over-load and load short-circuit over the wide range of input voltage, making it the appropriate IC for the small-sized AC adaptor. s FEATURES Operating power supply voltage : 10V to 28V Operating current : 2.5mA typ. Low standby current : 400µA typ. Control frequency range : 10kHz to 800kHz Operating temperature range : −30°C to +105°C Soft start circuit on-chip Overvoltage detection circuit on-chip (Continued) s PACKAGE 16-pin plastic SOP (FPT-16P-M06) MB3873 (Continued) Overload detection circuit on-chip Over temperature detection circuit on-chip Under voltage lockout protection circuit on-chip s PIN ASSIGNMENT (TOP VIEW) RT : 1 CT : 2 RD : 3 CD : 4 FB : 5 CS : 6 GND : 7 OUT : 8 16 : −IN 15 : +IN 14 : OVP 13 : OTP 12 : ENB 11 : VCC 10 : VREF 9 : VCC (O) (FPT-16P-M06) 2 MB3873 s PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol RT CT RD CD FB CS GND OUT VCC (O) VREF VCC ENB OTP OVP +IN –IN I/...