MP5001 MPS, MP5001 Datasheet - Page 10

• Manufacturer Part Number: MP5001
• Description: 5v, 1a- 5a Programmable Current Limit Switch
• Manufacturer: MPS

The fault flag is a internal flip-flop that can be set
or reset under various conditions:
UNDER VOLTAGE LOCK OUT OPERATION
If the supply (input) is below the UVLO threshold,
the output is disabled, and the fault line is driven
low.
When the supply goes above the UVLO
threshold, the output is enabled and the fault line
is released. When the fault line is released it will
be pulled high by a 25uA current source. No
external pull up resistor is required. In addition,
the pull up voltage is limited to 5 volts.
MP5001 Rev.0.92
10/15/2009
Fault description
Thermal Shutdown
Short/over current
1.
2.
3.
4.
Under Voltage
Over Voltage
Thermal Shutdown: set fault flag
Under Voltage: reset fault flag
Low voltage on Enable/Fault pin: reset
fault flag
Mid voltage on Enable/Fault pin: no
effect
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Shutdown part. The
Limit output voltage
Output is turned off
externally driven to
part is latched off
Internal action
until a UVLO or
Limit current
Table 3—Fault Function Influence in Application
ground.
MP5001 – 5V, 1A- 5A PROGRAMMABLE CURRENT LIMIT SWITCH
© 2009 MPS. All Rights Reserved.
www.MonolithicPower.com
Enable/Fault pin to
Effect on Fault
Enable/Fault pin
Internally drives
Internally drives
to mid level
Logic low
None
none
Pin
Under a fault, the Enable/Fault pin is driven to
the mid level.
There are 4 types of faults, and each fault has a
direct and indirect effect on the Enable/Fault pin
and the internal fault flag. In a typical application
there are one or more chips in a system. The
Enable/Fault lines will typically be connected
together.
THERMAL PROTECTION
When thermal protection is triggered, the output
is disabled and the fault line is driven to the mid
level. The thermal fault condition is latched
(meaning the fault flag is set), and the part will
remain latched off until the fault (enable) line is
brought low. Cycling the power below the UVLO
threshold will also reset the fault flag.
Effect on
Flag is Set
Flag is
None
Flag
none
reset
disabled, and fault flag is
Secondary part output is
Secondary part output is
Effect on secondary
disabled.
reset.
None
Part
none
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