ELM604PA 1.4MHz, 800mA dual PWM step-down converter
3) Short circuit protection
ELM604PA has short circuit protection. When the output is shorted to ground, the oscillator frequency is re-
duced to prevent the inductor current from increasing beyond the P MOSFET current limit. The frequen-
cy will return to the normal values once the short circuit condition is removed and the feedback voltage reach-
es 0.6V.
4) Maximum load current
ELM604PA can operate down to 2.5V input voltage, however the maximum load current decreases at lower
input due to large IR drop on the main switch and synchronous rectifier. The slope compensation signal re-
duces the peak inductor current as a function of the duty cycle to prevent sub-harmonic oscillations at duty cy-
cles greater than 50%. Conversely the current limit increases as the duty cycle decreases.
Rev.1.2
7 - 5
ELM-TECH [ ELM Technology Corporation ]
