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TPS40140 Datasheet(PDF) 31 Page - Texas Instruments

Part No. TPS40140
Description  Dual or 2-Phase, Stackable Controller
Download  68 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS40140 Datasheet(HTML) 31 Page - Texas Instruments

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SS
t
t1
t2
=
+
t2 +
C
SS
12 mA
0.7 V *
V
OUT
R
BIAS
R1 ) RBIAS
t1 +
C
SS
6 mA
V
OUT
R
BIAS
R1 ) RBIAS
3
SS
SS
t
C
58
10
=
´
´
TPS40140
www.ti.com
SLUS660I – SEPTEMBER 2005 – REVISED JANUARY 2015
9.1.6 Track (Soft-Start Without PreBiased Output)
A capacitor connected to the TRKx pins sets the power-up time. When UVLO_CEx is high and the internal
power-on reset (POR) is cleared, the calibrated current source, starts charging the external soft start capacitor
with 12-
μA. The PGOOD pin is held low during the start-up. The rising voltage across the capacitor serves as a
reference for the error amplifier, U10 and U14. When the soft start voltage reaches the level of the reference
voltage, VREF = 0.7 V, the converter’s output reaches the regulation point and further voltage rise of the soft-start
voltage has no effect on the output. When the soft start voltage reaches 1.4 V, the powergood (PGOOD) function
is cleared to be reported on the PGOOD pin. Normally the PGOOD pin goes high at this time. Equation 2 is used
to calculate the value of the soft-start capacitor. CSS is in Farads and tSS is given in seconds.
(2)
9.1.7 Soft-Start With PreBiased Outputs
For prebiased outputs the TPS40140 uses two levels of soft-start current that charge the soft-start capacitor
connected to the TRKx pin(s). PWM switching begins when the TRKx voltage rises to the voltage present on the
FBx pin. When the first PWM pulse occurs, the charging current is increased to 12
μA. Figure 30 shows the
typical waveforms present on the TRKx pin and the output voltage, VOUT when VOUT is prebiased. TRKx rises
due to the 6
μA current, until at 1 the voltage on TRKx equals the prebiased voltage on the FBx pin, at time t1. At
this time, the soft-start current is increased to 12
μA and TRKx rises with an increase in the slope. When TRKx
reaches 0.7 V, at time t2, the output should be in regulation. The voltage on the TRKx pin continues to rise.
When the TRKx voltage is 1.4 V, at time t3, the PGOODx signal is enabled. The TRKx voltage continues to rise
to 2.4 V where it is clamped internally. This approach provides for an accurate detection of the threshold where
FBx = TRKx. Figure 31 is a block diagram of the implementation. The calculation for the soft start time, due to
prebias, includes the time from t0 to t1, plus the time from t1 to t2, as shown in Equation 3 through Equation 5.
(3)
where
CSS is in Farads
tSS is in seconds
(4)
(5)
If there is no prebias (VOUT = 0 V), the equation reduces to case without prebias.
Copyright © 2005–2015, Texas Instruments Incorporated
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