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參數(shù)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(shù)： | 2/23頁 |
| 文件大?。?/td> | 309K |
| 代理商： | TPS40090QPWRQ1 |
V
ILIM + 2.7
I
PH(max)
R
CS
I
PH(max) + IOUT )
V
IN * VOUT
V
OUT
2
L
f
SW
V
IN
R
RT + KPH
39.2
103
f*1.041
PH
* 7
F
RPL + NPH
f
PH
SLUS845C
– JUNE 2008 – REVISED MAY 2011
Overvoltage Protection
If the voltage at the FB pin (VFB) exceeds VREF by more than 16%, the TPS40090 enters into an overvoltage
state. In this condition, the output signals from the controller to the external drivers is pulled low, causing the
drivers to force all of the upper MOSFETs to the OFF position and all the lower MOSFETs to the ON position. As
soon as VFB returns to regulation, the normal operating state resumes.
Overcurrent Protection
The overcurrent function monitors the voltage level separately on each current sense input and compares it to
the voltage on the ILIM pin set by a divider from the controller's reference. In case a threshold of V(ILIM)/2.7 is
exceeded the PWM cycle on the associated phase is terminated. The voltage level on the ILIM pin is determined
by the following expression:
(5)
where:
IPH(max) is a maximum value of the phase current allowed
RCS is a value of the current sense resistor used
(6)
If the overcurrent condition continues, each phase's PWM cycle is terminated by the overcurrent signals. This
puts a converter in a constant current mode with the output current programmed by the ILIM voltage. Eventually,
the supply and demand equilibrium on the converter output fails and the output voltage declines. When the
undervoltage threshold is reached, the converter enters a hiccup mode. The controller is stopped and the output
is not regulated any more, the soft-start pin function changes. It now serves as a timing capacitor for a fault
control circuit. The soft-start pin is periodically charged and discharged by the fault control circuit. After seven
hiccup cycles expire, the controller attempts to restore normal operation. If the overload condition is not cleared,
the controller stays in the hiccup mode indefinitely. In such conditions, the average current delivered to the load
is roughly 1/8 of the set overcurrent value.
Undervoltage Protection
If the FB pin voltage falls lower than the undervoltage protection threshold (84.5%), the controller enters the
hiccup mode as it is described in the Overcurrent Protection section.
Fault-Free Operation
If the SS pin voltage is prevented from rising above the 1-V threshold, the controller does not execute nor report
most faults and the PGOOD output remains low. Only the overcurrent function and current-sense fault remain
active. The overcurrent protection continues to terminate PWM cycle every time when the threshold is exceeded
but the hiccup mode is not entered.
Setting the Switching Frequency
The clock frequency is programmed by the value of the timing resistor connected from the RT pin to ground.
(7)
where:
KPH is a coefficient that depends on the number of active phases. For two-phase and three-phase
configurations, KPH= 1.333. For four-phase configurations, KPH= 1. fPH is a single phase frequency, kHz. The
RT resistor value is returned by the last expression in k
.
To calculate the output ripple frequency, use the following equation:
where:
NPH is a number of phases used in the converter.
(8)
10
Copyright
2008–2011, Texas Instruments Incorporated
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| TPS40090RHDR | 功能描述:DC/DC 開關(guān)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(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40090RHDRG4 | 功能描述:DC/DC 開關(guān)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(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40090RHDT | 功能描述:DC/DC 開關(guān)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(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40090RHDTG4 | 功能描述:DC/DC 開關(guān)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(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)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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