參數(shù)資料
型號(hào)： TPS23753PW
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 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(yè)數(shù)： 13/30頁(yè)
文件大?。?/td> 823K
代理商： TPS23753PW
R
CS
GATE
CS
R
T
N
R
S
C
S
5/09/08
15000
(
)
(
)
FRS
SW
R
k
f
kHz
=
RTN
FRS
R
F
R
S
47pF
Synchronization
Pulse
4/30 /08
V
SYNC
T
SYNC
RTN
FRS
R
F
R
S
47pF
Synchronization
Pulse
4/3 0/08
V
SYNC
T
S YNC
1:1
1000pF
Example:
Pulse PA0184
SLVS853C – JUNE 2008 – REVISED JANUARY 2010
www.ti.com
Figure 22. Additional Slope Compensation
CS may be required if the presence of RS causes increased noise, due to adjacent signals like the gate drive, to
appear at the CS pin. The TPS23753 has an internal pull-down on CS ( ~500 ) while the MOSFET is OFF to
reduce cycle-to-cycle carry-over voltage on CS.
FRS and Synchronization
The FRS pin programs the (free-running) oscillator frequency, and may also be used to synchronize the
TPS23753 converter to a higher frequency. The internal oscillator sets the maximum duty cycle at 80% and
controls the current-compensation ramp circuit. RFRS should be selected per the following equation.
(7)
The TPS23753 may be synchronized to an external clock to eliminate beat frequencies from a sampled system,
or to place emission spectrum away from an RF input frequency. Synchronization may be accomplished by
applying a short pulse ( > 25 ns) of magnitude VSYNC to FRS as shown in Figure 23. RFRS should be chosen so
that the maximum free-running frequency is just below the desired synchronization frequency. The
synchronization pulse terminates the potential on-time period, and the off-time period doesn’t begin until the
pulse terminates. A short pulse is preferred to avoid reducing the potential on-time.
Figure 23 shows examples of non-isolated and transformer-coupled synchronization circuits The pulse at the
FRS pin should reach between 2.5 V and VB, with a minimum width of 22 ns (above 2.5 V) and rise/fall times
less than 10 ns. The FRS node should be protected from noise because it is high-impedance.
Figure 23. Synchronization
Adapter ORing
Many PoE-capable devices are designed to operate from either a wall adapter or PoE power. A local power
solution adds cost and complexity, but allows a product to be used if PoE is not available in a particular
installation. While most applications only require that the PD operate when both sources are present, the
TPS23753 supports forced operation from either of the power sources. Figure 24 illustrates three options for
20
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
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(kāi)發(fā)工具 TPS23754 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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