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參數(shù)資料
| 型號： | TPS40304ADRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 508K |
| 代理商： | TPS40304ADRCT |
0
0.4
0.7 V
0.8
1.3 V
1.2
1.6
2.0
V
EN/SS
t – Time – ms
Calibration
Time
1.9 ms
V
IN
–
In
p
u
t
V
o
lt
a
g
e
–
V
SS_INT
UDG-09159
SLUSA30 – FEBRUARY 2010
www.ti.com
APPLICATION INFORMATION
Introduction
The TPS40304A is a cost-optimized synchronous buck controller providing high-end features to construct
high-performance DC/DC converters. Pre-bias capability eliminates concerns about damaging sensitive loads
during startup. Programmable overcurrent protection levels and hiccup overcurrent fault recovery maximize
design flexibility and minimize power dissipation in the event of a prolonged output short. Frequency Spread
Spectrum (FSS) feature reduces peak EMI noise by spreading the initial energy of each harmonic along a
frequency band, thus giving a wider spectrum with lower amplitudes.
Voltage Reference
The 591-mV band gap cell is internally connected to the non-inverting input of the error amplifier. The reference
voltage is trimmed with the error amplifier in a unity gain configuration to remove amplifier offset from the final
regulation voltage. The 1% tolerance on the reference voltage allows the user to design a very accurate power
supply.
Enable Functionality, Startup Sequence and Timing
After input power is applied, an internal current source of 40 A starts to charge up the soft-start capacitor
connected from EN/SS to GND. When the voltage across that capacitor increases to 0.7 V, it enables the internal
BP regulator followed by a calibration. The total calibration time is about 1.9 ms. See Figure 11. During the
calibration, the device performs in the following way. It disables the LDRV drive and injects an internal 10 A
current source to the resistor connected from LDRV to GND. The voltage developed across that resistor is then
sampled and latched internally as the OCP trip level until one cycles the input or toggles the EN/SS.
Figure 11. Startup Sequence and Timing
The voltage at EN/SS is internally clamped to 1.3 V before and/or during calibration to minimize the discharging
time once calibration is complete. The discharging current is from an internal current source of 140 A and it
pulls the voltage down to 0.4 V. It then initiates the soft-start by charging up the capacitor using an internal
current source of 10 A. The resulting voltage ramp on this pin is used as a second non-inverting input to the
error amplifier after an 800 mV (typical) downward level-shift; therefore, actual soft-start will not take place until
the voltage at this pin reaches 800 mV.
If EN/SS is left floating, the controller starts automatically. EN/SS must be pulled down to less than 270 mV to
guarantee that the chip is in shutdown mode.
10
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS40304A
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| TPS40304DRCR | 功能描述:DC/DC 開關(guān)控制器 3-20V Wide Input Synch Buck 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 安裝風格: 封裝 / 箱體:CPAK |
| TPS40304DRCT | 功能描述:DC/DC 開關(guān)控制器 3-20V Wide Input Synch Buck 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 安裝風格: 封裝 / 箱體:CPAK |
| TPS40304DRCT | 制造商:Texas Instruments 功能描述:Synchronous Buck Controller IC 制造商:Texas Instruments 功能描述:IC, SYNC BUCK CONTROLLER, SON-10 |
| TPS40304EVM-353 | 功能描述:電源管理IC開發(fā)工具 Eval with NexFET Pwr MOSFETs RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS40305 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-V TO 20-V INPUT SYNCHRONOUS BUCK CONTROLLER |
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