MP6215 –CURRENT-LIMITED POWER DISTRIBUTION SWITCH
FUNCTION BLOCK DIAGRAM
UVLO
+
Vref
OUT
IN
Current
Sense
--
--
-- -- --
Charge
Pump
--
AMP
Logic
+
-- FLAG
EN
Deglich
Thermat
Sense
--
GND
Figure2—Functional Block Diagram
DETAILED DESCRIPTION
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 MP6215 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.
Over Current
When the load exceeds trip current (minimum
threshold current triggering constant-current
mode) or a short is present, MP6215 switches
into to a constant-current mode (current limit
value). MP6215 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.
MP6215 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.
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.
MP6215 Rev. 0.9
3/23/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
7
MPS [ MONOLITHIC POWER SYSTEMS ]
