Single Event and Total Dose Hardened, High-Speed Dual Output PWMs

The IS-1825ASRH, IS-1825BSRH, IS-1825BSEH, ISL71823ASRH, and ISL71823BSRH are single event and total dose hardened pulse width modulators designed to be used in high-frequency switching power supplies in either voltage or current-mode configurations. These devices 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.

FEATUREs
• Electrically screened to DLA SMD 5962-02511
• QML qualified per MIL-PRF-38535 requirements
• Oscillator frequency: 1MHz (max)
• High output drive current: 1A peak (typ)
• Low startup current: 300µA (max)
• Undervoltage Lockout
   • Start threshold: 8.8V (max)
   • Stop threshold: 7.6V (min)
   • Hysteresis: 300mV (min)
• Pulse-by-pulse current limiting
• Programmable leading edge blanking
• Radiation acceptance testing - IS-1825xSRH,
   ISL71823xSRH
   • High Dose Rate (HDR) (50-300rad(Si)/s):
      300krad(Si)
• Radiation acceptance testing - IS-1825BSEH
   • High Dose Rate (HDR) (50-300rad(Si)/s):
      300krad(Si)
   • Low Lose Rate (LDR) (0.01rad(Si)/s): 50krad(Si)
• Latch-up immune (dielectrically isolated)
• SEE hardness (see SEE report for details)
   • SEU immune: LET= 35MeV•cm2/mg

APPLICATIONs
• Voltage or current mode switching power supplies
• Control of high current MOSFET drivers
• Motor speed and direction control