MP6233 –CURRENT-LIMITED POWER DISTRIBUTION SWITCH
MP6233 Rev. 1.0 www.MonolithicPower.com 7
8/21/2014 MPS Proprietary Information. Patent Protected.
Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
FUNCTION BLOCK DIAGRAM
Figure1—Functional Block Diagram
DETAILED DESCRIPTION
Over Current
When the load exceeds trip current (minimum
threshold current triggering constant-current
mode) or a short is present, MP6233 switches
into to a constant-current mode (current limit
value). MP6233 will be shutdown only if the
overcurrent condition stays long enough to
trigger thermal protection.
Trigger overcurrent protection for different
overload conditions occurring in applications:
1) The output has been shorted or overloaded
before the device is enabled or input applied.
MP6233 detects the short or overload and
immediately switches into a constant-current
mode.
2) A short or an overload occurs after the device
is enabled. After the current-limit circuit has
been tripped (reached the trip current
threshold), the device switches into constant-
current mode.
However, high current may
flow for a short period of time before the
current-limit circuit can react.
3) Output current has been gradually increased
beyond the recommended operating current.
The load current rises until the trip current
threshold is reached or until the thermal limit
of the device is exceeded. The MP6233 is
capable of delivering current up to the trip
current threshold without damaging the
device. Once the trip threshold has been
reached, the device switches into its
constant-current mode.
Flag Response
The FLAG pin is an open drain configuration.
This FAULT will report a fail mode after an 8ms
deglitch timeout. This is used to ensure that no
false fault signals are reported. This internal
deglitch circuit eliminates the need for extend
components. The FLAG pin is not deglitched
during an over temp. or a voltage lockout.
