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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： | 18/33頁 |
| 文件大小： | 1096K |
| 代理商： | TPS2492PW |
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SLUSA65A – JULY 2010 – REVISED AUGUST 2010
Additional Design Considerations
Calculation Tool SLVC033
The calculation tool for the TPS2490/91, SLVC033, may be used with the TPS2492/93. For accurate results, the
timer current constants need to be updated. This may be accomplished using the Excel Tools / Protection
command along with the password provided in the tool (spreadsheet).
Use of PG to Control Downstream Converters
Use the PG pin to control and sequence a downstream DC/DC converter. If this is not done a long time delay
may be needed to allow CO to fully charge before the converter starts. This practice will avoid having the
converter attempt to operate at a low input voltage, drawing large currents. This mode of converter operation has
the potential to form a stable operating point with the hotswap output I-V characteristic, preventing the system
from starting.
IMON Filtering
The internal monitoring circuits leave a small amount of residual noise at about 2.5 kHz on the IMON output.
While this does not contribute significant error at output voltages on the order of 1 V, better accuracy at low
outputs will benefit from an R-C filter. Figure 19 demonstrates this filtering with elements R6 and C2. An example
solution is a 1 k
Ω resistor and a 1.5 nF capacitor. A buffer (e.g. unity-gain opamp) may be required if the output
is used by a circuit that draws significant current.
Output Clamp Diode
Inductive loads or wiring inductance on the output may drive the OUT pin below GND when the circuit is
unplugged or during current limit. The OUT pin can be protected by D2 (see Figure 19) between the TPS2492/93
OUT to GND pins. The OUT pin can withstand a short transient to -1 V.
Input Clamp TVS
Energy stored in the inductance of input wiring has the capability to drive the input voltage up if the (load) current
is abruptly decreased. An example is a hard short on OUT rapidly raising the input current above the current limit
threshold, which is then abruptly driven to zero when the current limit gains control after several microseconds.
Combinations of input capacitance and transient voltage suppressor diodes (TVS - a type of Zener Diode) can
aid in controlling the voltage overshoot. This is demonstrated by D1 and C1 of Figure 19. While a small bypass
capacitor is recommended, the TVS is better able to control the voltage without the drawback of large input
capacitance.
Gate Clamp Diode
The TPS2492/93 has a relatively well-regulated gate voltage of 12 V to 16 V, even at low supply voltages. A
small clamp Zener from gate to source of M1, such as a BZX84C7V5, is recommended if VGS of M1 is rated
below this.
Input Bypass Capacitance
The input bypass capacitor, C1 per Figure 19 should be used to provide a low impedance local source of current
and control the supply dv/dt on the VCC pin.
Copyright 2010, Texas Instruments Incorporated
25
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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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