參數(shù)資料
型號(hào)： TPS40211DRCTG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO10
封裝： GREEN, PLASTIC, SON-10
文件頁(yè)數(shù)： 10/47頁(yè)
文件大?。?/td> 1375K
代理商： TPS40211DRCTG4
I
=
C(chg)
C
V
t
OUT
SS
t
>
SS
C
V
(I
I
)
OUT
OUT(oc)
EXT
-
SS(ofst)
DCHG
SS(dchg)
SS
SS(rst)
V
t
R
C
ln
V
÷
=
÷
è
(
)
(
)
BP
SS(rst)
CHG
SS(chg)
SS
BP
SS(ofst)
V
t
R
C
ln
V
-
÷
=
÷
-
è
(
)
CHG
DCHG
RSTRT min
t
=
+
SLUS772D – MARCH 2008 – REVISED APRIL 2010
www.ti.com
Also take note of VBP. Its value varies depending on input conditions. For example, a converter operating from a
slowly rising input initializes VBP at a fairly low value and increases during the entire startup sequence. If the
controller has a voltage above 8 V at the input and the DIS pin is used to stop and then restart the converter, VBP
is approximately 8 V for the entire startup sequence. The higher the voltage on BP, the shorter the startup time is
and conversely, the lower the voltage on BP, the longer the startup time is.
The soft-start time (tSS) must be chosen long enough so that the converter can start up without going into an
overcurrent state. Since the over current state is triggered by sensing the peak voltage on the ISNS pin, that
voltage must be kept below the overcurrent threshold voltage VISNS(oc). The voltage on the ISNS pin is a function
of the load current of the converter, the rate of rise of the output voltage and the output capacitance, and the
current sensing resistor. The total output current that must be supported by the converter is the sum of the
charging current required by the output capacitor and any external load that must be supplied during startup. This
current must be less than the IOUT(oc) value used in Equation 6 or Equation 7 (depending on the operating mode
of the converter) to determine the current sense resistor value. In these equations, the actual input voltage at the
time that the controller reaches the final output voltage is the important input voltage to use in the calculations. If
the input voltage is slowly rising and is at less than the nominal input voltage when the startup time ends, the
output current limit is less than IOUT(oc) at the nominal input voltage. The output capacitor charging current must
be reduced (decrease COUT or increase the tSS) or IOUT(oc) must be increased and a new value for RISNS
calculated.
(14)
(15)
Where:
IC(chg) is the output capacitor charging current in A
COUT is the total output capacitance in F
VOUT is the output voltage in V
tSS is the soft start time from Equation 13
IOUT(oc) is the desired over current trip point in A
IEXT is any external load current in A
The capacitor on the SS pin (CSS) also plays a role in overcurrent functionality. It is used as the timer between
restart attempts. The SS pin is connected to GND through a resistor, RSS(dchg), whenever the controller senses an
overcurrent condition. Switching stops and nothing else happens until the SS pin discharges to the soft-start
reset threshold, VSS(rst). At this point, the SS pin capacitor is allowed to charge again through the charging
resistor RSS(chg), and the controller restarts from that point. The shortest time between restart attempts occurs
when the SS pin discharges from VSS(ofst) (approximately 700 mV) to VSS(rst) (150 mV) and then back to VSS(ofst)
and switching resumes. In actuality, this is a conservative estimate since switching does not resume until the
VSSE ramp rises to a point where it is commanding more output voltage than exists at the output of the controller.
This occurs at some SS pin voltage greater than VSS(ofst) and depends on the voltage that remains on the output
overvoltage the converter while switching has been halted. The fastest restart time can be calculated by using
(16)
(17)
(18)
18
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40210 TPS40211
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