ST1845

ST1843 ST1845 Rad-tolerant current mode PWM controller Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Oscillator frequency guaranteed at 250 kHz Trimmed oscillator for precise frequency control Current mode operation to 500 kHz automatic feed forward compensation Latching PWM for cycle-by-cycle current limiting Internally trimmed reference with undervoltage lockout High current totem pole output Undervoltage lockout with hysteresis Low start-up and operating current Hermetic package 50 and 100 krad (Si) SEL free @ 120 MeV/cm2/mg at 125°C www.DataSheet.net/ Flat-8 Description The ST1843HR and ST1845HR ICs are radtolerant current mode PWM controllers providing an industry standard solution for the implementation of provides the off-line or DC to DC fixed frequency current mode control schemes with a minimal external parts count. Its radiation hardness and hermetic packaging makes it an ideal choice for aerospace and other harsh environments. Table 1. Device summary Quality level Engineering Model EPPL Package Lead finish Mass (g) Flat-8 Flat-8 Flat-8 Flat-8 Gold Gold Gold Gold 0.45 0.45 0.45 0.45 Order codes Duty cycle max Radiation level ST1843K1 ST1843FKG ST1845K1 ST1845RKG 100% 100% 50% 50% 50 krad (Si) 50 krad (Si) 100 krad (Si) 100 krad (Si) According to ESCC Target Engineering Model - According to ESCC Target September 2011 Doc ID 019049 Rev 1 1/25 www.st.com 25 Datasheet pdf - http://www.DataSheet4U.co.kr/ Contents ST1843 - ST1845 Contents 1 2 3 4 5 6 Block diagram . . . . ...