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參數(shù)資料
| 型號： | TPS54331DG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 684 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 25/27頁 |
| 文件大?。?/td> | 794K |
| 代理商： | TPS54331DG4 |
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www.ti.com
SLVS839C – JULY 2008 – REVISED MARCH 2010
TYPICAL CHARACTERISTICS (continued)
OVERVIEW
The TPS54331 is a 28-V, 3-A, step-down (buck) converter with an integrated high-side n-channel MOSFET. To
improve performance during line and load transients, the device implements a constant frequency, current mode
control which reduces output capacitance and simplifies external frequency compensation design. The
TPS54331 has a pre-set switching frequency of 570kHz.
The TPS54331 needs a minimum input voltage of 3.5V to operate normally. The EN pin has an internal pull-up
current source that can be used to adjust the input voltage under-voltage lockout (UVLO) with two external
resistors. In addition, the pull-up current provides a default condition when the EN pin is floating for the device to
operate. The operating current is 110 mA typically when not switching and under no load. When the device is
disabled, the supply current is 1mA typically.
The integrated 80 m
high-side MOSFET allows for high efficiency power supply designs with continuous output
currents up to 3A.
The TPS54331 reduces the external component count by integrating the boot recharge diode. The bias voltage
for the integrated high-side MOSFET is supplied by an external capacitor on the BOOT to PH pin. The boot
capacitor voltage is monitored by an UVLO circuit and will turn the high-side MOSFET off when the voltage falls
below a preset threshold of 2.1V typically. The output voltage can be stepped down to as low as the reference
voltage.
By adding an external capacitor, the slow start time of the TPS54331 can be adjustable which enables flexible
output filter selection.
To improve the efficiency at light load conditions, the TPS54331 enters a special pulse skipping Eco-modeTM
when the peak inductor current drops below 160mA typically.
The frequency foldback reduces the switching frequency during startup and over current conditions to help
control the inductor current. The thermal shut down gives the additional protection under fault conditions.
DETAILED DESCRIPTION
FIXED FREQUENCY PWM CONTROL
The TPS54331 uses a fixed frequency, peak current mode control. The internal switching frequency of the
TPS54331 is fixed at 570kHz.
ECO-MODE
TM
The TPS54331 is designed to operate in pulse skipping Eco-modeTM at light load currents to boost light load
efficiency. When the peak inductor current is lower than 160 mA typically, the COMP pin voltage falls to 0.5 V
typically and the device enters Eco-modeTM . When the device is in Eco-modeTM, the COMP pin voltage is
clamped at 0.5V internally which prevents the high side integrated MOSFET from switching. The peak inductor
current must rise above 160mA for the COMP pin voltage to rise above 0.5V and exit Eco-modeTM. Since the
integrated current comparator catches the peak inductor current only, the average load current entering
Eco-modeTM varies with the applications and external output filters.
VOLTAGE REFERENCE (Vref)
The voltage reference system produces a ±2% initial accuracy voltage reference (±3.5% over temperature) by
scaling the output of a temperature stable bandgap circuit. The typical voltage reference is designed at 0.8V.
BOOTSTRAP VOLTAGE (BOOT)
The TPS54331 has an integrated boot regulator and requires a 0.1 mF ceramic capacitor between the BOOT and
PH pin to provide the gate drive voltage for the high-side MOSFET. A ceramic capacitor with an X7R or X5R
grade dielectric is recommended because of the stable characteristics over temperature and voltage. To improve
drop out, the TPS54331 is designed to operate at 100% duty cycle as long as the BOOT to PH pin voltage is
greater than 2.1 V typically.
Copyright 2008–2010, Texas Instruments Incorporated
7
Product Folder Link(s): TPS54331
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS54331DR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 3A 28V In Step Down SWIFT DC/DC Cnvrtr RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54331DRG4 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 26V,3A DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| TPS54331DR-P | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| TPS54331EVM-232 | 功能描述:電源管理IC開發(fā)工具 SWIFT Cnvrtr 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 |
| TPS54331EVM-232 | 制造商:Texas Instruments 功能描述:DEVELOPMENT TOOL |
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