參數(shù)資料
型號： TPS40210DGQG4
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, MSOP-10
文件頁數(shù)： 9/47頁
文件大小： 1375K
代理商： TPS40210DGQG4
V
SSE(1)
V
SS
V
OUT
V
SSE
V
SS(ofst)
t
0
t
1
V
SS(ofst)+700 mV
V
IN - VD
t
2
t
3
2
5
4
SS
COMP
FB
TPS40210/11
R
SS(chg)
UDG-07121
+
R
SS(dchg)
700 mV REF
OC Fault
UVLO
DIS
Error Amplifier
(
)
SS
BP
SS(ofst)
SS
BP
SS(ofst)
FB
t
C
V
R
ln
V
=
-
÷
÷
-
+
è
www.ti.com
SLUS772D – MARCH 2008 – REVISED APRIL 2010
volts. It cannot do this due to the converter architecture. The output voltage starts from the input voltage less the
drop across the diode (VIN - VD) and rises from there. The point at which the output voltage starts to rise (t2) is
the point where the VSSE ramp passes the point where it is commanding more output voltage than (VIN - VD). This
voltage level is labeled VSSE(1). The time required for the output voltage to ramp from a theoretical zero to the
final regulated value (from t1 to t3) is determined by the time it takes for the capacitor connected to the SS pin
(CSS) to rise through a 700 mV range, beginning at VSS(ofst) above GND.
Figure 24. SS Pin Voltage and Output Voltage
Figure 25. SS Pin Functional Circuit
The required capacitance for a given soft start time t3 – t1 in Figure 24 is calculated in Equation 13.
(13)
Where:
tSS is the soft-start time, in seconds
RSS(chg) is the SS charging resistance in , typically 500 k
CSS is the value of the capacitor on the SS pin, in F
VBP is the value of the voltage on the BP pin, in V
VSS(ofst) is the approximate level shift from the SS pin to the error amplifier (~700 mV)
VFB is the error amplifier reference voltage, 700mV typical
Note that tSS is the time it takes for the output voltage to rise from 0 V to the final output voltage. Also note the
tolerance on RSS(chg) given in the electrical specifications table. This contributes to some variability in the output
voltage rise time and margin must be applied to account for it in design.
Copyright 2008–2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPS40210 TPS40211
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TPS40210DRCT 功能描述:電流型 PWM 控制器 Wide Inp Rng Crnt Mode Boost Cntrlr RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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