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MP1497S Scheda tecnica(PDF) 10 Page - Monolithic Power Systems

Il numero della parte MP1497S
Spiegazioni elettronici  High-Efficiency, 3A, 16V, 500kHz Synchronous, Step-Down Converter
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Produttore elettronici  MPS [Monolithic Power Systems]
Homepage  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP1497S Scheda tecnica(HTML) 10 Page - Monolithic Power Systems

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MP1497S – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MP1497S Rev. 1.01
www.MonolithicPower.com
10
9/7/2015
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 MPS. All Rights Reserved.
limit threshold. Under-voltage protection (UVP)
triggers if the FB voltage drops below the
under-voltage (UV) threshold—typically 50%
below the reference. Once UVP triggers, the
MP1497S enters hiccup mode to periodically
restart the part. This protection mode is
especially useful when the output is dead-
shorted to ground. The average short-circuit
current falls to alleviate thermal issues and to
protect the regulator. The MP1497S exits
hiccup mode once the over-current condition is
removed.
Thermal Shutdown
Thermal shutdown prevents the chip from
operating at exceedingly high temperatures.
When the silicon die temperature exceeds
150°C, it shuts down the whole chip. When the
temperature drops below its lower threshold
(typically 130°C) the chip is enabled again.
Floating Driver and Bootstrap Charging
An external bootstrap capacitor powers the
floating power MOSFET driver. This floating
driver has its own UVLO protection with a rising
threshold of 2.2V and a hysteresis of 150mV.
The bootstrap capacitor voltage is regulated
internally by VIN through D1, M1, C4, L1 and C2
(Figure 3). If (VIN-VSW) exceed 5V, U1 will
regulate M1 to maintain a 5V BST voltage
across C4. A 10Ω resistor placed between SW
and BST cap is strongly recommended to
reduce SW spike voltage.
Figure 3: Internal Bootstrap Charging Circuit,
Startup and Shutdown
If both VIN and EN exceed their appropriate
thresholds, the chip starts. The reference block
starts first, generating stable reference voltage
and currents, and then the internal regulator is
enabled. The regulator provides stable supply
for the remaining circuitries.
Three events can shut down the chip: EN low,
VIN low, and thermal shutdown. For the
shutdown procedure, the signaling path is first
blocked to avoid any fault triggering. The
COMP voltage and the internal supply rail are
then pulled down. The floating driver is not
subject to this shutdown command.


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