ST1845:Rad-tolerant current mode PWM controller

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.

Key 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
Product Specifications
DescriptionVersionSize
DS7312: Rad-tolerant current mode PWM controller1.1511 KB
Technical Notes & Articles
DescriptionVersionSize
TN1181: Engineering Model quality level1.1142 KB
Selection Guides
DescriptionVersionSize
Aerospace and Hi-rel - ESCC, JANS & QML products1.02 MB
Sample & Buy
Part NumberSMD PIN/Detailed SpecQuality LevelEPPLHi-Rel PackageLead FinishPacking TypePackage: Product MarkingECCN (EU)ECCN (US)Country of Origin
ST1845K1-Engineering Model-Flat-8GoldCarrier TapeST1843FK1NECEAR99FRANCE
ST1845RKG-According to ESCC-Flat-8GoldCarrier TapeST1845RKGNECEAR99FRANCE
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
ST1845K1FLAT8 lead 8mm EMIndustrialN/A
ST1845RKGFLAT8 lead 8mm FPIndustrialN/A
Rad-tolerant current mode PWM controller ST1845
Engineering Model quality level 1N5822U
Engineering Model quality level 1N5822U