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參數(shù)資料
| 型號： | TPS54519RTER |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, WQFN-16 |
| 文件頁數(shù)： | 2/33頁 |
| 文件大?。?/td> | 1269K |
| 代理商： | TPS54519RTER |
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÷
-
è
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0.6 V
R2 = R1
V
0.6 V
SLVSAT3
– SEPTEMBER 2011
DETAILED DESCRIPTION
FIXED FREQUENCY PWM CONTROL
The TPS54519 uses an adjustable fixed frequency, peak current mode control. The output voltage is compared
through external resistors on the VSENSE pin to an internal voltage reference by an error amplifier which drives
the COMP pin. An internal oscillator initiates the turn on of the high side power switch. The error amplifier output
is compared to the high side power switch current. When the power switch current reaches the COMP voltage
level the high side power switch is turned off and the low side power switch is turned on. The COMP pin voltage
increases and decreases as the output current increases and decreases. The device implements a current limit
by clamping the COMP pin voltage to a maximum level and also implements a minimum clamp for improved
transient response performance.
SLOPE COMPENSATION AND OUTPUT CURRENT
The TPS54519 adds a compensating ramp to the switch current signal. This slope compensation prevents
sub-harmonic oscillations as duty cycle increases. The available peak inductor current remains constant over the
full duty cycle range.
BOOTSTRAP VOLTAGE (BOOT) AND LOW DROPOUT OPERATION
The TPS54519 has an integrated boot regulator and requires a small ceramic capacitor between the BOOT and
PH pin to provide the gate drive voltage for the high side MOSFET. The value of the ceramic capacitor should be
0.1
μF. A ceramic capacitor with an X7R or X5R grade dielectric with a voltage rating of 10 V or higher is
recommended because of the stable characteristics over temperature and voltage.
To improve drop out, the TPS54519 is designed to operate at 100% duty cycle as long as the BOOT to PH pin
voltage is greater than 2.1 V, typically. The high side MOSFET is turned off using an UVLO circuit, allowing for
the low side MOSFET to conduct when the voltage from BOOT to PH drops below 2.1 V. Since the supply
current sourced from the BOOT pin is very low, the high side MOSFET can remain on for more switching cycles
than are required to refresh the capacitor, thus the effective duty cycle of the switching regulator is very high.
ERROR AMPLIFIER
The TPS54519 has a transconductance amplifier. The error amplifier compares the VSENSE voltage to the lower
of the SS/TR pin voltage or the internal 0.6 V voltage reference. The transconductance of the error amplifier is
250
μA/V during normal operation. When the voltage of VSENSE pin is below 0.6 V and the device is regulating
using the SS/TR voltage, the gm is 85
μA/V. The frequency compensation components are placed between the
COMP pin and ground.
VOLTAGE REFERENCE
The voltage reference system produces a precise
±2% voltage reference over temperature by scaling the output
of a temperature stable bandgap circuit. The bandgap and scaling circuits produce 0.6 V at the non-inverting
input of the error amplifier.
ADJUSTING THE OUTPUT VOLTAGE
The output voltage is set with a resistor divider from the output node to the VSENSE pin. It is recommended to
use divider resistors with 1% tolerance or better. Start with a 100 k
for the R1 resistor and use the Equation 1
to calculate R2. To improve efficiency at very light loads consider using larger value resistors. If the values are
too high the regulator is more susceptible to noise and voltage errors from the VSENSE input current are
noticeable.
(1)
10
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS54519
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54519RTET | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.95-6VIN,5A SYNC STEP-DOWN CONVERTER RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS54521 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
| TPS54521EVM-607 | 功能描述:電源管理IC開發(fā)工具 TPS54521 Eval Mod 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 |
| TPS54521RHL | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 5A Synchronous Step Down SWIFT? Converter |
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