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TPS658620ZQZT датащи(PDF) 61 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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производитель  TI [Texas Instruments]
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3.55.5 OUTPUT DISCHARGE SWITCHES
3.55.6 DYNAMIC VOLTAGE POSITIONING
TPS658620
Advanced Power Management Unit
www.ti.com
SLVS993 – OCTOBER 2009
Table 3-30. SM0,SM1, SM2 PWM/PFM Mode Selection
SMODE1 [Addr 0x47]
Default to 0
Bit Number
B7
B6
B5
B4
B3
B2
B1
B0
Bit Name
RSVD477
SM2_GPIO
SM1_GPIO
SM0_GPIO
RSVD473
SM2_PWM
SM1_PWM
SM0_PWM
Function
SPARE
SM2 AUTO
SM1 AUTO
SM0 AUTO
SPARE
SM2 PWM
SM1 PWM
SM0 PWM
PFM
PFM
PFM
MODE ON
MODE ON
MODE ON
CONTROL
CONTROL
CONTROL
SELECTION
SELECTION
SELECTION
Table 3-31 details how the GPIO control is implemented. Note that the GPIO1 polarity indicated in
Table 3-31 is controlled by bit GPIOINV, register 0x5E.
Table 3-31. GPIO1 PWM/PFM Mode Control
SMx_GPIO
SMx_PWM
GPIO1 POLARITY
GPIO1
CONVERTER MODE
0
0
x
x
Auto PWM/PFM
0
1
x
x
PWM Only
1
x
Inverted
0
PWM Only
1
x
Inverted
1
Auto PWM/PFM
1
x
Not Inverted
0
Auto PWM/PFM
1
x
Not Inverted
1
PWM Only
When the SM0, SM1 and SM2 converters are disabled, an integrated switch automatically discharges the
converter output capacitor.
The converter output discharge switches are always enabled when NORMAL state is set and during the
SUPPLYSEQ state.
This feature reduces the voltage under/overshoots at load steps from light to heavy load and vice versa. It
provides more headroom for both the voltage drop at a load step and the voltage increase at a load
throw-off. This improves load transient behavior.
At light loads, in which the converter operate in PFM Mode, the output voltage is regulated typically 1%
higher than the nominal value. In case of a load transient from light load to heavy load, the output voltage
will drop until it reaches the COMP LOW threshold set to 2% below the nominal value and enters PWM
mode. During a load throw off from heavy load to light load, the voltage overshoot is also minimized due to
active regulation turning on the low-side channel switch.
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DETAILED DESCRIPTION
61


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