RT6208

Copyright © 2015 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS6208-00

May

2015

4

is equal to half of the peak current. The hysteresis

nature of this control architecture results in a switching

frequency that is a function of the input voltage, output

voltage and inductor value. This behavior provides

inherent short‑circuit protection. If the output is shorted

to ground, the inductor current will decay very slowly

during a single switching cycle. Since the high-side

switch turns on only when the inductor current is near

zero, the RT6208 inherently switches at a lower

frequency during short-circuit condition.

Boundary Conduction

Mode

Sleep

Mode

Sleep

Mode

Switch between High-Side PC and

Low-Side ZC

Stop Switch

High-Side Peak Current (PC)

Low-Side Zero Current (ZC)

Inductor Current

Figure 1. Hysteresis Mode