Total dose and heavy ions evaluation of UC1806 pulse width modulator from Unitrode

Abstract

idth Modulator. in B CMOS technology, was evaluated for both total dose and heavy ions effects. The heavy ions testing was performed in both static and dynamic modes. A high switch off DC/DC converter sensitivity was observed, unpredictable under static test only.

An SET-Free, All-Digital Controlled Point-of-Load Regulator for Next-Generation Power Systems: ADC-POL

“…Laser energy did not affect the transient amplitude and duration; only a minimum energy was needed to create a transient. These results are interesting since they differ from a typical behavior observed in linear regulators where the transient characteristics are a strong function of ion energy [1]- [10]. The SET sensitive area is quite small as well.…”

“…Ion strikes in the sensitive portion of a typical analog dc-dc converter (i.e., ramp generator or comparator) causes missing pulses within the PWM duty cycle signal [1]- [10], resulting in long transient pulses at the converter output. A similar problem exists for linear regulators, laser pulse strikes causing settling errors at the error amplifier's high output impedance.…”

“…A similar problem exists for linear regulators, laser pulse strikes causing settling errors at the error amplifier's high output impedance. These long pulses are application-dependent and vary with input bias and load conditions [1]- [10]. It has been shown as well that SETs in linear regulators are really dependent on the equivalent series resistance (ESR) values of their output capacitor and characterizing a part with the same capacitor with different values of ESR can introduces some instability in the transient response.…”

“…SET represents a major threat for power systems. Converter transient responses are dependent on load conditions as well as temperature [1]- [10]. Ion strikes on a sensitive area of a conventional pulse-width modulated switching converter or a linear regulator can result in an unacceptably large transient pulse of several volts of amplitude and several hundreds of at their output [1]- [10].…”

Total-dose and single-event effects in DC/DC converter control circuitry

“…The different event types observed at the output of the SG1525 are shown, and the type of circuitry associated with each type of event is discussed. In addition to power converters, SEE in pulse width modulators (PWMs) is a significant issue in many other applications [6], [7], so understanding the SEE response of the PWM devices considered here is important.…”