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參數資料
| 型號： | TPS40101RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | PLASTIC, QFN-24 |
| 文件頁數： | 16/37頁 |
| 文件大?。?/td> | 774K |
| 代理商： | TPS40101RGET |
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RLOAD
RCESR
COUT
RLDC
RBIAS
R4
R5
R1
R3
C3
C1
C2
R2
VIN
UDG06060
VOUT
VX
+
L
X2
+
C4
Programming Soft-Start Time
C
SS + TSS
20 mA
V
FB
F
(28)
SLUS726 – SEPTEMBER 2006
APPLICATION INFORMATION (continued)
Figure 34. AC Behavioral Model for Tracking Control Loop
To use the model, the AC voltage source is swept over the frequency range of interest. The open loop ac
response is VX/VOUT.
The soft-start time of the TPS40101 is fully user programmable by selecting a single capacitor. The SS pin
sources 20
A to charge this capacitor. The actual output ramp-up time is the amount of time that it takes for the
20
A to charge the capacitor through a 690 mV range. There is some initial lag due to an offset from the actual
SS pin voltage to the voltage applied to the error amplifier. See Figure 36. The soft-start is done in a closed loop
fashion, meaning that the error amplifier controls the output voltage at all times during the soft start period and
the feedback loop is never open as occurs in duty cycle limit soft-start schemes. The error amplifier has two
non-inverting inputs, one connected to the 690 mV reference voltage, and one connected to the offset SS pin
voltage. The lower of these two voltages is what the error amplifier controls the FB pin to. As the voltage on the
SS pin ramps up past approximately 1.04 V (resulting in 690 mV at the error amplifier “+” input – See Figure 36),
the 690 mV reference voltage becomes the dominant input and the converter has reached its final regulation
voltage.
The capacitor required for a given soft-start ramp time for the output voltage is given by:
where
T
SS is the desired soft-start ramp time (s)
C
SS is the required capacitance on the SS pin (F)
V
FB is the reference voltage feedback loop (690 mV)
23
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| TPS40101RGETG4 | 功能描述:DC/DC 開關控制器 Mid Range Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40-11 | 制造商:TOTAL-POWER 制造商全稱:TOTAL-POWER 功能描述:40 WATT OPEN - FRAME SWITCHING POWER SUPPLY |
| TPS40-12 | 制造商:TOTAL-POWER 制造商全稱:TOTAL-POWER 功能描述:40 WATT OPEN - FRAME SWITCHING POWER SUPPLY |
| TPS40120 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VRM10.0 COMPLIANT PROGRAMMABLE FEEDBACK DIVIDER |
| TPS40120PW | 功能描述:DC/DC 開關控制器 Programable Feedback Divider RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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