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參數資料
| 型號： | TPS65251RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, VQFN-40 |
| 文件頁數： | 10/31頁 |
| 文件大小： | 1827K |
| 代理商： | TPS65251RHAT |
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I
LIM
=
180
-
R
LIM
+ 1.3
I
LIM
=
150
-
R
LIM
+ 1.12
SLVSAA4B – JUNE 2010 – REVISED JANUARY 2011
www.ti.com
Current Limit Protection
The TPS65251 current limit trip is set by the following formulae:
(4)
Figure 24. Buck 1
(5)
Figure 25. Buck 2 and 3
All converters operate in hiccup mode: Once an over-current lasting more than 10 ms is sensed in any of the
converters, all the converters will shut down for 10 ms and then the start-up sequencing will be tried again. If the
overload has been removed, the converter will ramp up and operate normally. If this is not the case the converter
will see another over-current event and shuts-down again repeating the cycle (hiccup) until the failure is cleared.
If an overload condition lasts for less than 10 ms, only the relevant converter affected will go into and out of
under-voltage and no global hiccup mode will occur. The converter will be protected by the cycle-by-cycle current
limit during that time.
Overvoltage Transient Protection
The device incorporates an overvoltage transient protection (OVP) circuit to minimize voltage overshoot. The
OVP feature minimizes the output overshoot by implementing a circuit to compare the FB pin voltage to OVP
threshold which is 109% of the internal voltage reference. If the FB pin voltage is greater than the OVP threshold,
the high side MOSFET is disabled preventing current from flowing to the output and minimizing output overshoot.
When the FB voltage drops below the lower OVP threshold which is 107%, the high side MOSFET is allowed to
turn on the next clock cycle.
18
Copyright 2010–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS65251
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| TPS65252EVM | 功能描述:電源管理IC開發工具 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 |
| TPS65253RHDR | 功能描述:PMIC 解決方案 4.5V-16Vin/2 Buck Converters RoHS:否 制造商:Texas Instruments 安裝風格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
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