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TPS5140PAGR датащи(PDF) 9 Page - Texas Instruments

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номер детали TPS5140PAGR
подробное описание детали  FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS5140PAGR датащи(HTML) 9 Page - Texas Instruments

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TPS5140
FOUR-CHANNEL DC/DC CONTROLLER FOR NOTEBOOK PC POWER
SLVS305A – DECEMBER 2000 – REVISED JANUARY 2001
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
3.3-V regulator
TPS5140 has a 3.3-V linear regulator. The output is made from the internal 5 V regulator or external 5 V from
REG5V_IN. The 3.3-V regulator has an output current limit. The maximum output current is 30 mA.
5-V switch
If the internal 5-V switch senses a 5-V input from the REG5V_IN terminal, the internal 5-V linear regulator will
be disconnected from the MOSFET drivers. The external 5 V will be used for both the low-side driver and the
high-side bootstrap, thus increasing the efficiency.
auto PWM/SKIP
The PWM_SEL terminal selects either the auto PWM/SKIP or fixed PWM mode. If this terminal is lower than
0.5 V, the outputs operate in the fixed PWM mode. If 2.5 V (minimum) is applied, the outputs operate in auto
PWM/SKIP mode. In the auto PWM/SKIP mode, the operation changes from the PWM mode to the SKIP mode
automatically under light load conditions. Avoid using a MOSFET with very low rDS(on) if the auto SKIP function
is implemented.
error amp
All three synchronous buck channels have their own error amplifier to regulate the output. The error amplifier
is used in the PWM mode for high output current conditions (> 0.2 A). Voltage mode control is implemented.
skip comparator
In skip mode, all three synchronous buck channels have their own hysteresis comparator to regulate the output
voltages. The hysteresis voltage is set internally and typically at 8.5 mV. The delay from the comparator input
to the driver output is typically 1.2
µs.
low-side driver
The low-side driver is designed to drive low-rDS(on) n-channel MOSFETs. The maximum drive voltage is 5 V from
VREF5. Ch1, 2, and 3 MOSFET driver capability is 1.5 A, source and sink.
high-side driver
The high-side driver is designed to drive low-rDS(on) n-channel MOSFETs. CH1 and CH2 MOSFET drivers have
1.2 A capability, source and sink. When configured as a floating driver, the bias voltage to the driver is developed
from VREF5, limiting the maximum drive voltage between OUT_u and LL to 5 V. The maximum voltage that can
be applied between LHx and OUTGND is 33 V.
dead time
Dead time prevents shoot-through current from flowing through the main power MOSFETs during switching
transitions by actively controlling the turnon time of the MOSFETs drivers.
current protection
Current protection is achieved by sensing the drain-to-source voltage drop of the low-side power MOSFET
during the low-side MOSFET’s on time at OUTGND and LL. An external resistor between VCC_ SENSE and
TRIP terminal in series with the internal current source adjusts the current limit. When the voltage drop during
the low-side MOSFET on-time is high enough, the current comparator triggers the current protection and the
MOSFET drivers are turned off. After a programmable time delay, the SCP circuit latches off all MOSFET
drivers. The internal current source tolerance is
±10%. CH2 monitors both high-side and low-side MOSFET
voltage drops.


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