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參數資料
| 型號： | TPS40009DGQRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3.05 X 4.98 MM, GREEN, PLASTIC, MSOP-10 |
| 文件頁數： | 26/28頁 |
| 文件大?。?/td> | 677K |
| 代理商： | TPS40009DGQRG4 |
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TPS40007
TPS40009
SLUS589B NOVEMBER 2003 REVISED FEBRUARY 2005
7
www.ti.com
APPLICATION INFORMATION
ERROR AMPLIFIER
The error amplifier has a bandwidth of greater than 5 MHz, with open loop gain of at least 55 dB. The COMP
output voltage is clamped to a level above the oscillator ramp in order to improve large-scale transient response.
OSCILLATOR
The oscillator uses an internal resistor and capacitor to set the oscillation frequency. The ramp waveform is a
sawtooth at the PWM frequency with a peak voltage of 1.25 V, and a valley of 0.31 V. The PWM duty cycle is
limited to a maximum of 94%, allowing the bootstrap capacitor to charge during every cycle.
BOOTSTRAP/CHARGE PUMP
There is an internal switch between VDD and BOOT. This switch charges the external bootstrap capacitor for
the floating supply. If the resistance of this switch is too high for the application, an external schottky diode
between VDD and BOOT can be used. The peak voltage on the bootstrap capacitor is approximately equal to
VDD.
DRIVER
The HDRV and LDRV MOSFET drivers are capable of driving gate-to-source voltages up to 5.5 V. At VIN, = 5 V
and using appropriate MOSFETs, a 20-A converter can be achieved. The LDRV driver switches between VDD
and ground, while the HDRV driver is referenced to SW and switches between BOOT and SW.
SYNCHRONOUS RECTIFICATION AND PREDICTIVE DELAY
In a normal buck converter, when the main switch turns off, current is flowing to the load in the inductor. This
current cannot be stopped immediately without using infinite voltage. In order to provide a path for current to
flow and maintain voltage levels at a safe level, a rectifier or catch device is used. This device can be either a
conventional diode, or it can be a controlled active device if a control signal is available to drive it. The TPS4000x
provides a signal to drive an N-channel MOSFET as a rectifier. This control signal is carefully coordinated with
the drive signal for the main switch so that there is minimum delay from the time that the rectifier MOSFET turns
off and the main switch turns on, and minimum delay from when the main switch turns off and the rectifier
MOSFET turns on. This scheme, Predictive Gate Drive
t delay, uses information from the current switching
cycle to adjust the delays that are to be used in the next cycle. Figure 2 shows the switch-node voltage waveform
for a synchronously rectified buck converter. Illustrated are the relative effects of a fixed-delay drive scheme
(constant, pre-set delays for the turn-off to turn-on intervals), an adaptive delay drive scheme (variable delays
based upon voltages sensed on the current switching cycle) and the predictive delay drive scheme.
Note that the longer the time spent in diode conduction during the rectifier conduction period, the lower the
efficiency. Also, not described in Figure 2 is the fact that the predictive delay circuit can prevent the body diode
from becoming forward biased at all. This results in a significant power savings when the main MOSFET turns
on, and minimizes reverse recovery loss in the body diode of the rectifier MOSFET.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS40009EVM-001 | 功能描述:電源管理IC開發工具 TPS40009-001 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS40020 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED LOW INPUT VOLTAGE MODE SYNCHRONOUS BUCK CONTROLLER |
| TPS40020PWP | 功能描述:DC/DC 開關控制器 Enhanced Low Input 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 |
| TPS40020PWPG4 | 功能描述:DC/DC 開關控制器 Enh Lo Input Freq Sync. Buck 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 |
| TPS40020PWPR | 功能描述:DC/DC 開關控制器 Enh Lo Input Freq Sync. Buck 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 |
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