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ST1843 Datasheet(PDF) 1 Page - STMicroelectronics |
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ST1843 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 25 page  September 2011 Doc ID 019049 Rev 1 1/25 25 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 Description The ST1843HR and ST1845HR ICs are rad- tolerant 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. Flat-8 Table 1. Device summary Order codes Duty cycle max Radiation level Quality level EPPL Package Lead finish Mass (g) ST1843K1 100% 50 krad (Si) Engineering Model - Flat-8 Gold 0.45 ST1843FKG 100% 50 krad (Si) According to ESCC Target Flat-8 Gold 0.45 ST1845K1 50% 100 krad (Si) Engineering Model - Flat-8 Gold 0.45 ST1845RKG 50% 100 krad (Si) According to ESCC Target Flat-8 Gold 0.45 www.st.com |
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