The single event and total dose hardened IS-1825ASRH and ISL71823ASRH pulse width modulators are designed to be used in high frequency, switching power supplies in either voltage or current-mode configurations. Both designs include a precision voltage reference, a low power start-up circuit, a high frequency oscillator, a wide-band error amplifier and a fast current-limit comparator.

The IS-1825ASRH features dual, alternating outputs operating from zero to less than 50% duty-cycle, while the ISL71823ASRH features dual, in-phase outputs operating from zero to less than 100% duty cycle.

Constructed with the Intersil Rad-hard Silicon Gate (RSG) dielectrically isolated BiCMOS process, these devices are immune to single event latch-up and have been specifically designed to provide a high level of immunity to single event transients. All specified parameters are guaranteed and tested for 300krad(Si) total dose performance.

Detailed Electrical Specifications for these devices are contained in SMD 5962-02511. A "hot-link" is provided on our website for downloading the SMD.

• Electrically Screened to DSCC SMD # 5962-02511
• QML Qualified per MIL-PRF-38535 Requirements
• Radiation Environment
  • Total Dose 300krad(SI) (max)
  • Latch-up Immune Dielectrically Isolated
  • SEU immune LET = 35MeV/mg/cm²(max)
• Oscillator Frequency 1MHz(max)
• High Output Drive Current 1A peak(typ)
• Low Start-up Current 300μA(max)
• Undervoltage Lockout
  • Start Threshold 8.8V(max)
  • Stop Threshold 7.6V(min)
  • Hysteresis. 300mV(min)
• Improved Soft-Start Function Compared with Commercial 1825A/1823A Types
• Pulse-by-Pulse Current Limiting
• Latched Overcurrent Comparator with Full Cycle Restart
• Programmable Leading Edge Blanking

• Voltage or Current-Mode Switching Power Supplies
• Control of High Current MOSFET Drivers
• Motor Speed and Direction Control