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參數資料
| 型號： | TPS65251RHAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數： | 6/31頁 |
| 文件大小： | 1827K |
| 代理商： | TPS65251RHAR |
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R
k
f
OSC(
) = 174
W
-1.122
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
www.ti.com
DETAILED DESCRIPTION
Adjustable Switching Frequency
To select the internal switching frequency connect a resistor from ROSC to ground. Figure 21 shows the required
resistance for a given switching frequency.
Figure 21. ROSC vs Switching Frequency
(1)
For operation at 800 kHz a 230-k
resistor is required.
Synchronization
The status of the SYNC pin will be ignored during start-up and the TPS65251’s control will only synchronize to
an external signal after the PGOOD signal is asserted. The status of the SYNC pin will be ignored during start-up
and the TPS65251 will only synchronize to an external clock if the PGOOD signal is asserted. When
synchronization is applied, the PWM oscillator frequency must be lower than the sync pulse frequency to allow
the external signal trumping the oscillator pulse reliably. When synchronization is not applied, the SYNC pin
should be connected to ground.
Out-of-Phase Operation
Buck 1 has a low conduction resistance compared to Buck 2 and 3. Normally Buck 1 is used to drive higher
system loads. Buck 2 and 3 are used to drive some peripheral loads like I/O and line drivers . The combination of
Buck 2 and 3’s loads may be on par with Buck 1’s. In order to reduce input ripple current, Buck 2 operates in
phase with Buck 3; Buck 1 and Buck 2 operate 180 degrees out-of-phase. This enables the system, having less
input ripple, to lower component cost, save board space and reduce EMI.
Delayed Start-Up
If a delayed start-up is required on any of the buck converters fit a ceramic capacitor to the ENx pins. The delay
added is ~1.67 ms per nF connected to the pin. Note that the EN pins have a weak 1-M
pull-up to the 3V3 rail.
14
Copyright 2010–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS65251
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS65251RHAT | 功能描述:PMIC 解決方案 PMU with 3 DC/DC Converters RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65252EVM | 功能描述:電源管理IC開發(fā)工具 TPS65252 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 |
| TPS65252RHDR | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65252RHDT | 功能描述:PMIC 解決方案 4.5-16V Inp w/ 2 BUCK CONVERTER RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| TPS65253EVM | 功能描述:電源管理IC開發(fā)工具 TPS65253 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 |
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