參數(shù)資料
型號(hào)： TPS40200MDREPG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝： GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù)： 7/43頁
文件大?。?/td> 1069K
代理商： TPS40200MDREPG4
www.ti.com
Programming the Soft-Start Time
Css
+
105 kW
2
+
3
4
V
SST
V
(offset)
SST
COMP
FB
SS
700 mV
+
Ideal
Diodes
700 mV
Error Amplifier
TPS40200
O
S
C
L
2
t
p
(5)
÷
è
-
=
4
.
1
V
ln
C
R
t
SST
SS
c
SS
(6)
SGLS371 – JANUARY 2007
GENERAL INFORMATION (continued)
An external capacitor, CSS, connected from the soft-start (SS) pin to ground controls the TPS40200 soft-start
interval. An internal charging resistor connected to VDD produces a rising reference voltage, which is connected
though a 700-mV offset to the reference input of the TPS40200 error amplifier. When the soft-start capacitor
voltage (VCSS) is below 150 mV, there is no switching activity. When VCSS rises above the 700-mV offset, the
error amplifier starts to follow VSST – 700 mV, and uses this rising voltage as a reference. When VCSS reaches
1.4 V, the internal reference takes over, and further increases have no effect. An advantage of initiating a slow
start in this fashion is that the controller cannot overshoot because its output follows a scaled version of the
controller's reference voltage. A conceptual drawing of the circuit that produces these results is shown in
Figure 29. A consequence of the 700-mV offset is that the controller does not start switching until the VCSS has
charged up to 700 mV. The output remains at 0 V during the resulting delay. When VCCS exceeds the 700-mV
offset, the TPS40200 output follows the soft-start time constant. Once above 1.4 V, the 700-mV internal
reference takes over, and normal operation begins.
Figure 29. Soft-Start Circuit
The slow-start time should be more (slower) than the time constant of the output LC filter. This time constraint
may be expressed as:
The calculation of the soft-start interval is simply the time it takes the RC network to exponentially charge from
0 V to 1.4 V. An internal 105-k
charging resistor is connected from the SS pin to V
SST. For applications where
the voltage is above 8 V, an internal regulator clamps the maximum charging voltage to 8 V.
The result of this is a formula for the start-up time, as given by:
Where:
tSS = Required soft-start time (in seconds)
CSS = Soft-start capacitor value (in F)
Rc = Internal soft-start charging resistor (105 k nominal)
VSST = Input voltage up to a maximum of 8 V
15
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