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參數資料
| 型號： | TPS51220ARTVR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 333 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, QFN-32 |
| 文件頁數： | 19/53頁 |
| 文件大小： | 1380K |
| 代理商： | TPS51220ARTVR |
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SLUS897D – DECEMBER 2008 – REVISED FEBRUARY 2010
www.ti.com
HIGH-SIDE DRIVER
The high-side driver is designed to drive high current, low RDS(on) N-channel MOSFET(s). The drive capability is
represented by its internal resistance, which is 1.7
for VBSTx to DRVHx, and 1 for DRVHx to SWx. When
configured as a floating driver, 5 V of bias voltage is delivered from VREG5 supply. The instantaneous drive
current is supplied by the flying capacitor between VBSTx and SWx pins. The average drive current is equal to
the gate charge at Vgs = 5V times switching frequency. This gate drive current as well as the low-side gate drive
current times 5 V makes the driving power which needs to be dissipated mainly from TPS51220A package. A
dead time to prevent shoot through is internally generated between high-side MOSFET off to low-side MOSFET
on, and low-side MOSFET off to high-side MOSFET on.
LOW-SIDE DRIVER
The low-side driver is designed to drive high-current low-RDS(on) N-channel MOSFET(s). The drive capability is
represented by its internal resistance, which are 1.3
for VREG5 to DRVLx and 0.7 for DRVLx to GND. The
5-V bias voltage is delivered from VREG5 supply. The instantaneous drive current is supplied by an input
capacitor connected between VREG5 and GND. The average drive current is also calculated by the gate charge
at Vgs = 5 V times switching frequency.
CURRENT SENSING SCHEME
In order to provide both good accuracy and cost effective solution, the TPS51220A supports external resistor
sensing and inductor DCR sensing. An RC network with high quality X5R or X7R ceramic capacitor should be
used to extract voltage drop across DCR. 0.1mF is a good value to start the design. CSPx and CSNx should be
connected to positive and negative terminal of the sensing device respectively. TPS51220A has an internal
current amplifier. The gain of the current amplifier, Gc, is selected by TRIP terminal. In any setting, the output
signal of the current amplifier becomes 100mV at the OCL setting point. This means that the current sensing
amplifier normalize the current information signal based on the OCL setting. Attaching a RC network
recommended even with a resistor sensing scheme to get an accurate current sensing; see the external parts
selection session for detailed configurations.
26
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS51220A
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS51220ARTVT | 功能描述:電流型 PWM 控制器 Fixed-Freq,Notebook Sys Pwr Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TPS51220ARTVT | 制造商:Texas Instruments 功能描述:Controller IC |
| TPS51220ATRTVRQ1 | 功能描述:電流型 PWM 控制器 Current-Mode NB Sys Pwr Controller RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| TPS51220EVM | 功能描述:電源管理IC開發工具 TPS51220EVM Hi Perf Synch Buck 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 |
| TPS51220RHBR | 功能描述:電流型 PWM 控制器 Fixed Freq 99% Duty Cycle Peak Current RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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