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參數資料
| 型號： | TPS40077PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數： | 8/43頁 |
| 文件大?。?/td> | 847K |
| 代理商： | TPS40077PWPRG4 |
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VDG03172
RAMP
COMP
SW
VIN
SW
COMP
RAMP
VPEAK
VVALLEY
T2
tON1 > tON2 and d1 > d2
tON2
tON1
d +
t
ON
T
T1
PROGRAMMING SOFT START
t
START w 2p
L
C
OUT
(5)
C
SS + tSS
I
SS
V
FB
(6)
SLUS714D – JANUARY 2007 – REVISED APRIL 2009 ..................................................................................................................................................... www.ti.com
Figure 23. Voltage Feed-Forward and PWM Duty Cycle Waveforms
TPS40077 uses a closed-loop approach to ensure a controlled ramp on the output during start-up. Soft start is
programmed by connecting an external capacitor (CSS) from the SS pin to GND. This capacitor is charged by a
fixed current, generating a ramp signal. The voltage on SS is level-shifted down approximately 1 V and fed into a
separate noninverting input to the error amplifier. The loop is closed on the lower of the level-shifted SS voltage
or the 700-mV internal reference voltage. Once the level-shifted SS voltage rises above the internal reference
voltage, output-voltage regulation is based on the internal reference. To ensure a controlled ramp-up of the
output voltage, the soft-start time should be greater than the L-COUT time constant or:
Note that there is a direct correlation between tSTART and the input current required during start-up. The lower
tSTART is, the higher the input current required during start-up, because the output capacitance must be charged
faster. For a desired soft-start time, the soft-start capacitance, CSS, can be found from:
16
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS40077
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| TPS40090PW | 功能描述:DC/DC 開關控制器 4 Ch Multiphase Buck DC/DC Controller 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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