RT6208
this architecture, the maximum average output current
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.
V
REF
V
FB
V
REF
- V
Hys
High-Side Peak Current (PC)
Inductor Current
Low-Side Zero Current (ZC)
Sleep
Mode
Boundary Conduction
Mode
Sleep
Mode
Stop Switch
Switch between High-Side PC and
Low-Side ZC
Figure 1. Hysteresis Mode
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS6208-02
May 2016
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
