ISL78843ASRH

Radiation Hardened, High Performance Industry Standard Single-Ended Current Mode PWM Controller

Product Status: Mass Production

OVERVIEW

The ISL78843ASRH is a high performance, radiation hardened drop-in replacement for the popular 28C4x and 18C4x PWM controllers suitable for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Fast signal propagation and output switching characteristics make these ideal products for existing and new designs. Features include up to 13.2V operation, low operating current, 90µA typical start-up current, adjustable operating frequency to 1MHz and high peak current drive capability with 50ns rise and fall times.

KEY FEATURES

  • Electrically screened to DLA SMD #5962-07249
  • QML qualified per MIL-PRF-38535 requirements
  • 1A MOSFET gate driver
  • 90µA typical start-up current, 125µA maximum
  • 35ns propagation delay current sense to output
  • Fast transient response with peak current-mode control
  • 9V to 13.2V operation
  • Adjustable switching frequency to 1MHz
  • 50ns rise and fall times with 1nF output load
  • Trimmed timing capacitor discharge current for accurate dead time/maximum duty cycle control
  • 1.5MHz bandwidth error amplifier
  • Tight tolerance voltage reference over line, load, and temperature
  • ±3% current limit threshold
  • Pb-free available (RoHS compliant)
  • Radiation acceptance testing - ISL7884xASRH
    • HDR (50-300rad(Si)/s): 100krad(Si)
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    APPLICATIONS

  • Current mode switching power supplies
  • Isolated buck and flyback regulators
  • Boost regulators
  • Direction and speed control in motors
  • Control of high current FET drivers

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL78843ASRH
Basic Information
Production Status
Mass Production
Class
V, Q, /PROTO
DLA SMD
5962-07249
High Dose Rate (HDR) krad (Si)
100
SEL (MeV/mg/cm2)
43
SMD URL
Qualification Level
QML Class Q (military), QML Class V (space)
Temperature Range
-55 to +125

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