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參數(shù)資料
| 型號： | TPS23753PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.505 A SWITCHING CONTROLLER, 273 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | GREEN, PLASTIC, TSSOP-14 |
| 文件頁數(shù)： | 8/30頁 |
| 文件大?。?/td> | 823K |
| 代理商： | TPS23753PW |
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000.0E
+0
10.0E-3 20.0E-3 30.0E-3 40.0E-3 50.0E-3 60.0E-3 70.0E-3 80.0E-3 90.0E-3 100.0E-
3
t-Time10-ms/DIV
-0.7
-0.6
-0.5
IPI
VDD-RTN
VC-RTN
INRUSH
TurnON
VOUT
50V/DIV
2V/DIV
10V/DIV
100mA/Div
Exaggeratedprimary-
secondarysoftstarthandoff
SLVS853C – JUNE 2008 – REVISED JANUARY 2010
www.ti.com
Converter switching is allowed if the PD is not in inrush and the VC under-voltage lock out (UVLO) permits it.
Continuing the startup sequence shown in Figure 19, VVC rises as the startup current source charges CVC and
M1 switching is inhibited by the status of the VC UVLO. The VB regulator powers the internal converter circuits as
VVC rises. Startup current is turned off, converter switching is enabled, and a softstart cycle starts when VVC
exceeds UVLO1 (~9 V). VVC falls as it powers both the internal circuits and the switching MOSFET gate. If the
converter control-bias output rises to support VVC before it falls to UVLO1 – UVLO1H (~5.5 V), a successful
startup occurs. Figure 19 shows a small droop in VVC while the output voltage rises smoothly and a successful
startup occurs.
Figure 19. Power Up and Start
If VVDD-VSS drops below the lower PoE UVLO (UVLOR – UVLOH, ~30.5 V), the hotswap MOSFET is turned off,
but the converter will still run. The converter will stop if VVC falls below the converter UVLO (UVLO1 – UVLOH,
~5.5 V), the hotswap is in inrush current limit, or 0% duty cycle is demanded by VCTL (VCTL < VZDC, ~1.5 V), or
the converter is in thermal shutdown.
PD Interface Features
The PD section has the following functions, with the first four covered above.
Detection
Classification
VDD to VSS UVLO
Orderly sequencing of CIN charge and converter operation
Hotswap switch current limit
Hotswap switch foldback
Hotswap thermal protection
The internal hotswap MOSFET is protected against output faults with a current limit and deglitched foldback. The
PSE output cannot be relied on to protect the PD MOSFET against transient conditions, so the PD implements
its own protection. High stress conditions include converter output shorts, shorts from VDD to RTN, or transients
on the input line. An overload on the pass MOSFET engages the current limit, with VRTN-VSS rising as a result. If
VRTN rises above ~12 V for longer than ~400 μs, the current limit reverts to the inrush limit, and turns the
converter off. The 400
μs deglitch feature prevents momentary transients from causing a PD reset, provided that
recovery lies within the bounds of the hotswap and PSE protection. Figure 20 shows an example of recovery
from a 15 V PSE rising voltage step. The hotswap MOSFET goes into current limit, overshooting to a relatively
low current, recovers to 420 mA full current limit, and charges the input capacitor while the converter continues to
run. The MOSFET did not go into foldback because VRTN-VSS was below 12 V after the 400 μs deglitch.
16
Copyright 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS23753
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| TPS23753PW | 制造商:Texas Instruments 功能描述:Controller IC |
| TPS23753PWG4 | 功能描述:熱插拔功率分布 PoE Interface & Iso Cnvrtr & Cntrlr RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS23753PWR | 功能描述:熱插拔功率分布 Interface and Iso Cnvrtr and Cntrlr RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS23753PWRG4 | 功能描述:熱插拔功率分布 PoE Interface & Iso Cnvrtr & Cntrlr RoHS:否 制造商:Texas Instruments 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS23754EVM-383 | 功能描述:電源管理IC開發(fā)工具 TPS23754 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)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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