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參數資料
| 型號： | TPS2492PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數： | 5/33頁 |
| 文件大小： | 1096K |
| 代理商： | TPS2492PW |
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www.ti.com
SLUSA65A – JULY 2010 – REVISED AUGUST 2010
APPLICATION INFORMATION
Basic Operation
The TPS2492/93 features include:
1. Adjustable under-voltage and over-voltage lockout;
2. Turn-on inrush limit;
3. High-side gate drive for an external N-channel FET;
4. FET protection (power limit and current limit);
5. Adjustable overload timeout;
6. Output current monitor;
7. Status output;
8. Charge-complete indicator for downstream converter sequencing; and
9. Optional automatic restart mode.
The TPS2492/93 features power-limiting FET protection that allows independent control of current limit (to set
maximum full-load current), power limit (to keep FET in its safe operating area), and overload time (to control
temperature rise). The power limiting feature controls the V and I across the FET to protect it, and does not
control load power. This protection is a specialized form of foldback output limiting. Given a constant power
dissipation, computation of peak junction temperature is straight forward. The TPS2393 provides a small
operating duty cycle into a short, reducing the average temperature rise of the FET to levels similar to normal
operation in many systems. This prevents overheating and failure with prolonged exposure to an output short.
The typical application circuit, and oscilloscope plots of Figure 13 and Figure 17 demonstrate many of the
functions described above.
Board Plug-In (Figure 13)
Only the bypass capacitor charge current and small bias currents are evident when a board is first plugged in as
seen in Figure 13. The TPS2492/93 is held inactive with GATE, PROG, and TIMER held low, and with PG and
FLT open drain, for less than 1 ms while internal voltages stabilize. Then GATE, PROG, TIMER, FLT and PG are
released and the part begins sourcing current to the GATE pin because UVEN is high and OV is low. The
external FET begins to turn on while the voltage across it, V(SENSE-OUT), and current through it,
V(VCC-SENSE)/RSENSE, are monitored. Current initially rises to the value which satisfies the power limit engine (PLIM/
VVCC) since the output capacitor was discharged. The shape of the input current waveform shows the operation
of the FET power limit. In this case, the 5-A current limit is never reached as the output reaches full charge. This
is likely due to the limited gate slew rate.
Copyright 2010, Texas Instruments Incorporated
13
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS2492PW | 制造商:Texas Instruments 功能描述:HOT SWAP CONTROLLER IC 80V TSSOP-14 |
| TPS2492PWR | 功能描述:熱插拔功率分布 Pos Hi-Vltg Pwr-Ltd Hotswap Controller RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2493EVM-002 | 功能描述:電源管理IC開發工具 TPS2493 Hot Swap ontroller 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 |
| TPS2493EVM-004 | 功能描述:電源管理IC開發工具 TPS2493 Hot Swap ontroller 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 |
| TPS2493PW | 功能描述:熱插拔功率分布 Pos Hi-Vltg Pwr-Ltd Hotswap Controller RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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