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參數資料
| 型號： | TPS40090QPWRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | GREEN, PLASTIC, TSSOP-24 |
| 文件頁數： | 23/23頁 |
| 文件大小： | 309K |
| 代理商： | TPS40090QPWRQ1 |
1.0
0.7
EN
BP5
SS
VOUT
PGOOD
t -Time
t
SS +
0.7
C
SS
5
10*6
t
PG + 1.43
T
SS
V
OUT + 0.7 V
R1
R2 )
1
SLUS845C
– JUNE 2008 – REVISED MAY 2011
Figure 2. Power-Up Waveforms
When the BP5 pin voltage crosses its lower undervoltage threshold and the power-on reset function is cleared,
the calibrated current source starts charging the soft start capacitor. The PGOOD pin is held low during the start
up. The rising voltage across the capacitor serves as a reference for the error amplifier assuring start-up in a
closed loop manner. When the soft start pin voltage reaches the level of the reference voltage VREF = 0.7 V, the
converter's output reaches the regulation point and further rise of the soft start voltage has no effect on the
output.
(2)
When the soft-start voltage reaches level of 1 V, the power good (PGOOD) function is cleared and reported on
the PGOOD pin. Normally, the PGOOD pin goes high at this moment. The time from when SS begins to rise to
when PGOOD is reported is:
(3)
Output Voltage Programming
The converter output voltage is programmed by the R1/R2 divider from the output of the differential amplifier. The
center point of the divider is connected to the inverting output of the error amplifier (FB), as shown in Figure 5.
(4)
Current Sense Fault Protection
Multiphase controllers with forced current sharing are inherently sensitive to failure of a current sense
component. In the event of such failure, the whole load current can be steered with catastrophic consequences
into a single channel where the fault has happened. The dedicated circuit in the TPS40090 controller prevents it
from starting up if any current sense pin is open or shorted to ground. The current-sense fault detection circuit is
active only during device initialization, and it does not provide protection should a current-sense failure happen
during normal operation.
Copyright
2008–2011, Texas Instruments Incorporated
9
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS40090RHDR | 功能描述:DC/DC 開關控制器 4 Ch Multiph 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 |
| TPS40090RHDRG4 | 功能描述:DC/DC 開關控制器 4Ch Multiphase Buck DC/DC 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 |
| TPS40090RHDT | 功能描述:DC/DC 開關控制器 4Ch Multiphase Buck DC/DC 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 |
| TPS40090RHDTG4 | 功能描述:DC/DC 開關控制器 4Ch Multiphase Buck DC/DC 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 |
| TPS40091 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH FREQUENCY MULTIPHASE CONTROLLER |
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