原裝TIUCC28950PWR UCC28950PWR UCC28950PWR over operating free-air temperature range (unless otherwise noted) (1)(2) MIN MAX UNIT Input supply voltage, VDD (3) –0.4 20 V OUTA, OUTB, OUTC, OUTD, OUTE, OUTF –0.4 VDD + 0.4 V Input voltage on DELAB, DELCD, DELEF, SS/EN, DCM, TMIN, RT, SYNC, RSUM, EA+, EA-, COMP, CS, ADEL, ADELEF –0.4 VREF + 0.4 V Output voltage on VREF –0.4 5.6 V Continuous total power dissipation See Dissipation Ratings Operating virtual junction temperature, TJ –40 +150 °C Operating ambient temperature, TA –40 +125 °C Lead temperature (soldering, 10 sec.) +300 °C Storage temperature, Tstg –65 +150 °C

UNDERVOLTAGE LOCKOUT (UVLO) UVLO_RTH Start threshold 6.75 7.3 7.9 V UVLO_FTH Minimum operating voltage after start 6.15 6.7 7.2 V UVLO_HYST Hysteresis 0.53 0.6 0.75 V SUPPLY CURRENTS IDD(off) Startup current VDD is 5.2 V 150 270 μA IDD Operating supply current 5 10 mA VREF OUTPUT VOLTAGE VREF VREF total output range 0 ≤ IR ≤ 20 mA; VDD = from 8 V to 17 V 4.925 5 5.075 V ISCC Short circuit current VREF = 0 V –53 –23 mA SWITCHING FREQUENCY (½ OF INTERNAL OSCILLATOR FREQUENCY FOSC) FSW(nom) Total range 92 100 108 kHz DMAX Maximum duty cycle 95% 97% SYNCHRONIZATION PHSYNC Total range RT = 59 kΩ between RT and GND; Input pulses 200 kHz, D = 0.5 at SYNC 85 90 95 °PH FSYNC Total range RT = 59 kΩ between RT and 5 V; –40 °C ≤ TJ ≤ +125°C 180 200 220 kHz TPW Pulse width 2.2 2.5 2.8 μs