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参数资料
| 型号： | TPS23756PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.1 A SWITCHING CONTROLLER, 278 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 25/41页 |
| 文件大小： | 1405K |
| 代理商： | TPS23756PWP |
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OUT
T2P-OUT
RT2P-OUT
T2P-OUT
V
(low)
5
0.4
I
=
= 0.46 m A
R
10000
-
RT2P
MIN
TEMP
100
I
= 0.5 mA
= 0.625 mA
100
CTR
100
20
@
- D
-
C
T2P
FLED
T2P
RT2P
V
12
1
1.1
R
=
= 15.48 k
I
0.625 mA
-
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C
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IN
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A
Adapter
R
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APD1
APD
1
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kW
2
4
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5
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2
4
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3
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P
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1
2
6
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2
3
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1
3
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For48V
Adapter
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TN
58V
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VDD
10nF
TPS23754
TPS23754-1
TPS23756
www.ti.com
SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009
(a)
3. The optocoupler CTR will be needed to determine RT2P. A device with a minimum CTR of 300% at 5 mA
LED bias current is selected. CTR will also vary with temperature and LED bias current. The strong variation
of CTR with diode current makes this a problem that requires some iteration using the CTR versus IDIODE
curve on the optocoupler data sheet.
(a) Using the (normalized) curves, a current of 0.4 mA to 0.5 mA is required to support the output current at
the minimum CTR at 25°C.
(a) Pick an IDIODE. For example one around the desired load current.
(b) Use the optocoupler datasheet curve to determine the effective CTR at this operating current. It is
usually necessary to apply the normalized curve value to the minimum specified CTR. It might be
necessary to ratio or offset the curve readings to obtain a value that is relative to the current that the
CTR is specified at.
(c) If IDIODE × CTRI_DIODE is substantially different from IRT2P_OUT, choose another IDIODE and repeat.
(b) This manufacturer’s curves also indicate a –20% variation of CTR with temperature. The approximate
forward voltage of the optocoupler diode is 1.1 V from the data sheet.
(c) VFLED
1.1 V
(d) Select a 15.4 k
resistor. Even though the minimum CTR and temperature variation were considered,
the designer might choose a smaller resistor for a little more margin.
Advanced ORing Techniques
See Advanced Adapter ORing Solutions using the TSP23753, TI document number SLVA306A for ORing
applications that also work with the TPS23754. The material in sections Adapter ORing and Protection, D1 are
important to consider as well. The following applications are unique to the TPS23754 with the introduction of
PPD.
Option 2 ORing with PoE acting as a hot backup is eased by connecting PPD to VDD per Figure 34. This PPD
connection enables the class regulator even when APD is high. The R-Zener network (1.8 k
– 24 V) is the
simplest circuit that will satisfy MPS requirements, keeping the PSE online. This network may be switched out
when the APD is not powered with an optocoupler. This works best with a 48-V adapter and the
APD-programmed threshold as high as possible. An example of an adapter priority application with smooth
switchover between a 48 V adapter and PoE is shown on the right side of Figure 34. DAPD is used to reduce the
effective APD hysteresis, allowing the PSE to power the load before VVDD1-VRTN falls too low and causes a
hotswap foldback.
Figure 34. Option 2 PoE Backup ORing
Copyright 2008–2009, Texas Instruments Incorporated
31
相关PDF资料 |
PDF描述 |
|---|---|
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| TPS2376PWR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS23756PWPR | 功能描述:热插拔功率分布 Hi Pwr Eff PoE Inter face & DC/DC Cntrlr RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS23757EVM | 功能描述:电源管理IC开发工具 TPS23757 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS23757PW | 功能描述:热插拔功率分布 Hi Eff PoE Inter & DC/DC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS23757PWR | 功能描述:热插拔功率分布 Hi Eff PoE Interface & DC/DC Controller RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2375D | 功能描述:热插拔功率分布 IEEE 802.3af PoE Pwr Device Cntrler RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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