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參數(shù)資料
| 型號： | TPS40055QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 27/28頁 |
| 文件大?。?/td> | 571K |
| 代理商： | TPS40055QPWPRQ1 |
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APPLICATION INFORMATION
SETTING THE SWITCHING FREQUENCY (PROGRAMMING THE CLOCK OSCILLATOR)
R
T +
1
f
SW
17.82
10*6
* 17 kW
(1)
PROGRAMMING THE RAMP GENERATOR CIRCUIT
RAMP
COMP
SW
VIN
UDG02131
TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
The TPS40054/55/57 family of parts allows the user to optimize the PWM controller to the specific application.
The TPS40055 is the controller of choice for synchronous buck designs, which includes most applications. It has
two quadrant operations and will source or sink output current. This provides the best transient response.
The TPS40054 operates in one quadrant and sources output current only, allowing for paralleling of converters
and ensures that one converter does not sink current from another converter. This controller also emulates a
standard buck converter at light loads where the inductor current goes discontinuous. At continuous output
inductor currents, the controller operates as a synchronous buck converter to optimize efficiency.
The TPS40057 operates in one quadrant as a standard buck converter during start up. After the output has
reached the regulation point, the controller operates in two quadrant modes and is put in a synchronous buck
configuration. This is useful for applications that have the output voltage prebiased at some voltage before the
controller is enabled. When the TPS40057 controller is enabled it does not sink current during start up, which
would pull current from the prebiased voltage supply.
The TPS4005x has independent clock oscillator and ramp generator circuits. The clock oscillator serves as the
master clock to the ramp generator circuit. The switching frequency, fSW in kHz, of the clock oscillator is set by a
single resistor RT) to ground. The clock frequency is related to RT, in k by Equation 1 and the relationship is
charted in Figure 3.
The ramp generator circuit provides the actual ramp used by the PWM comparator. The ramp generator provides
voltage feed-forward control by varying the PWM ramp slope with line voltage, while maintaining a constant ramp
magnitude. Varying the PWM ramp directly with line voltage provides excellent response to line variations since
the PWM does not have to wait for loop delays before changing the duty cycle. (See Figure 2 ).
Figure 2. Voltage Feed-Forward Effect on PWM Duty Cycle
The PWM ramp must be faster than the master clock frequency or the PWM is prevented from starting. The
PWM ramp time is programmed via a single resistor RKFF) pulled up to VIN. RKFF is related to RT and the
minimum input voltage (VIN(min)) through the following:
8
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| TPS40056 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS, TRACKING BUCK CONTROLLER |
| TPS40056PWP | 功能描述:DC/DC 開關(guān)控制器 Wide Vin Synch 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 |
| TPS40056PWPG4 | 功能描述:DC/DC 開關(guān)控制器 Wide Vin Synch 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 |
| TPS40056PWPR | 功能描述:DC/DC 開關(guān)控制器 Wide Vin Synch Buck DC/DC Contr 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 |
| TPS40056PWPRG4 | 功能描述:DC/DC 開關(guān)控制器 Wide Vin Synch Buck DC/DC Contr 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 |
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