The Radiation Hardened HS-1825ARH Pulse Width Modulator is designed to be used in high frequency switched-mode power supplies and can be used in either current-mode or voltage-mode. It is well suited for singleended boost converter applications.

Device features include a precision voltage reference, low power start-up circuit, high frequency oscillator, wide-band error amplifier, and fast current-limit comparator. The use of proprietary process capabilities and unique design techniques results in fast propagation delay times and high output current over a wide range of output voltages. Constructed with the Intersil Rad Hard Silicon Gate (RSG) Dielectric Isolation BiCMOS process, the HS-1825ARH has been specifically designed to provide highly reliable performance when exposed to harsh radiation environments.

Specifications for Rad Hard QML devices are controlled by the Defense Supply Center in Columbus (DSCC). The SMD numbers listed below must be used when ordering.

Detailed Electrical Specifications for the HS-1825ARH are contained in SMD 5962-99558. That document may be easily downloaded from our website. www.intersil.com/

• Electrically Screened to DESC SMD # 5962-99558
• QML Qualified per MIL-PRF-38535 Requirements
• Radiation Environment
  • Maximum Total Dose 300 krad(SI)
  • Vertical Architecture Provides Low Dose Rate Immunity
  • DI RSG Process Provides Latch-Up Immunity
• Low Start-Up Current 100µA (Typ)
• Fast Propagation Delay 80ns (Typ)
• 12V to 30V Operation
• 1A (Peak) Dual Output Drive Capability
• 5.1V Reference
• Undervoltage Lockout
• Programmable Soft-Start
• Switching Frequencies to 500kHz
• Latched Overcurrent Comparator with Full Cycle Restart
• Programmable Leading Edge Blanking Circuit

• Current or Voltage Mode Switching Power Supplies
• Motor Speed and Direction Control