MCP1602T Просмотр технического описания (PDF) - Microchip Technology
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MCP1602T Datasheet PDF : 26 Pages
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4.4 Soft Start
The output of the MCP1602 is controlled during start-
up. This control allows for a very minimal amount of
VOUT overshoot during start-up from VIN rising above
the UVLO voltage or SHDN being enabled.
4.5 Overtemperature Protection
Overtemperature protection circuitry is integrated in the
MCP1602. This circuitry monitors the device junction
temperature and shuts the device off if the junction tem-
perature exceeds the typical 150oC threshold. If this
threshold is exceeded, the device will automatically
restart once the junction temperature drops by
approximately 10oC. The soft start is reset during an
overtemperture condition.
4.6 Overcurrent Protection
Cycle-by-cycle current limiting is used to protect the
MCP1602 from being damaged when an external short
circuit is applied. The typical peak current limit is
700 mA. If the sensed current reaches the 700 mA
limit, the P-Channel MOSFET is turned off, even if the
output voltage is not in regulation. The device will
attempt to start a new switching cycle when the internal
oscillator sets the internal RS latch.
MCP1602
4.7 Enable/Disable Control
The SHDN pin is used to enable or disable the
MCP1602. When the SHDN pin is pulled low, the
device is disabled. When pulled high the device is
enabled and begins operation provided the input
voltage is not below the UVLO threshold or a fault
condition exists.
4.8 Undervoltage Lockout (UVLO)
The UVLO feature uses a comparator to sense the
input voltage (VIN) level. If the input voltage is lower
than the voltage necessary to properly operate the
MCP1602, the UVLO feature will hold the converter off.
When VIN rises above the necessary input voltage, the
UVLO is released and soft start begins. Hysteresis is
built into the UVLO circuit to compensate for input
impedance. For example, if there is any resistance
between the input voltage source and the device when
it is operating, there will be a voltage drop at the input
to the device equal to IIN x RIN. The typical hysteresis
is 200 mV.
© 2007 Microchip Technology Inc.
DS22061A-page 13
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