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TPS65232A2DCAR Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS65232A2DCAR
Description  TRIPLE BUCK POWER MANAGEMENT IC
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS65232A2DCAR Datasheet(HTML) 11 Page - Texas Instruments

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I
=
LIM
R
I
TRIP
TRIP
·
10
· RDS(ON)
¾
TPS65232
www.ti.com
SLVSA42 – FEBRUARY 2010
OVER CURRENT PROTECTION
Over current protection (OCP) for BUCK1 is achieved by comparing the drain-to-source voltage of the low-side
MOSFET to a set-point voltage, which is defined by both the internal current source, ITRIP, and the external
resistor connected between the TRIP pin and ground. Over current threshold is calculated as follows:
(1)
ITRIP has a typical value of 10 mA at 25°C and a temperature coefficient of 3700 ppm/°C to compensate the
temperature dependency of the MOS RDS(ON). The TPS65232 supports cycle-by-cycle over current limiting
control which means that the controller compares the drain-to-source voltage of the low-side FET to the set-point
voltage once per switching cycle and blanks out the next switching cycle if an over-current condition is detected.
If in the following cycle over current condition is detected again, the controller blanks out 2, then 4, 8, and up to
16 cycles before turning on the high-side driver again. In an over current condition the current to the load
exceeds the current to the output capacitor thus the output voltage will drop, and eventually cross the under
voltage protection threshold and shut down the BUCK controller. Buck 2 and 3 show a similar mode of operation.
All converters operate in “hiccup mode”: Once an over-current is sensed, the controller shuts off the converter for
a given time and then tries to start again. If the overload has been removed, the converter will ramp up and
operate normally. If this is not the case, the converter will see another over-current event and shuts down again
repeating the cycle until the failure is cleared.
SOFT START
Soft start for all three BUCKs is controlled by a single capacitor connected to the SS pin and an internal current
source. When one of the BUCKs is enabled, the SS capacitor is pre-charged to the output voltage divided by the
feed-back ratio before the internal SS current source starts charging the external capacitor. The output voltage of
the BUCK ramps up as the SS pin voltage increased from its pre-charged value to 0.8 V. The soft start time is
calculated from the SS supply current (ISS) and the capacitor value and has a typical value of 0.4 ms/nF or
1.3 ms for a 3.3-nF capacitor connected to the SS pin. Before the next rail is enabled, the SS cap is discharged
and the SS cycle starts over again.
UNDER VOLTAGE LOCKOUT (UVLO)
TPS65232 monitors VIN and VINB pin voltages and will disable one or more power paths depending on the
current use condition:
If VIN drops below 4.7 V, BUCK1, 2, and 3 are disabled.
If VINB drops below 4.25 V and either BUCK2 or BUCK3 are enabled, all three output rails are disabled.
UVLO state is not latched and the system recovers as soon as the input voltage rises above its respective
threshold. All three BUCK_ENx pins are discharged and remain discharged during UVLO to ensure proper power
sequencing when the system recovers.
THERMAL SHUTDOWN (TSD)
TPS65232 monitors junction temperature and will disable the power path (BUCK1-3) if junction temperature rises
above the specified trip point. All three BUCK_ENx pins are discharged and remain discharged during TSD to
ensure proper power sequencing when the system recovers.
LOOP COMPENSATION
All three BUCKs are voltage mode converters designed to be stable with ceramic capacitors. Refer to
Component Selection Procedure section for calculating feedback components.
3.3-V REGULATOR
The TPS65232 has a built-in 3.3-V regulator for powering internal circuitry. The 3.3-V rail can also be used for
enabling the BUCK regulators and/or the USB switches, but is not intended for supplying any other external
circuitry.
Copyright © 2010, Texas Instruments Incorporated
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11
Product Folder Link(s): TPS65232
Not Recommended for New Designs


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