IP FORM (Y) SMALL-OUTLINE (D) SMALL-OUTLINE (D-8) PLASTIC DIP (P) 0C to 70C UC3842D UC3843D UC3844D UC3845D UC3842D-8 UC3843D-8 UC3844D-8 UC3845D-8 UC3842P UC3843P UC3844P UC3845P UC3842Y UC3843Y UC3844Y UC3845Y -40C to 85C UC2842D UC2843D UC2844D UC2845D UC2842D-8 UC2843D-8 UC2844D-8 UC2845D-8 UC2842P UC2843P UC2844P UC2845P - - - - The D and D-8 packages are available taped and reeled. Add the suffix R to the device type (i.e., UC3842DR or UC3842DR-8). Chip forms are tested at 25C. functional block diagram VCC 12 34 V NOM GND UVLO 9 - 5-V REF EN + 14 REF Internal Bias Vref Good Logic RT/CT 7 11 10 OSC VC OUTPUT T Error Amplifier VFB COMP ISENSE 3 1 + - S 2R R R 1V 5 CurrentSense Comparator The toggle flip-flop is present only in UC2844, UC2845, UC3844, and UC3845. Pin numbers shown are for the D Package. 2 8 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 PWM Latch POWER GROUND UC284x, UC384x CURRENT-MODE PWM CONTROLLERS SLVS038D - JANUARY 1989 - REVISED JULY 1999 absolute maximum ratings over ope