ST1843 Datasheet, PDF (1/25 Pages) STMicroelectronics – Rad-tolerant current mode PWM controller

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
September 2011
Doc ID 019049 Rev 1
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