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| 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： | 3/41页 |
| 文件大小： | 1405K |
| 代理商： | TPS23756PWP |
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TJ Junction Temperature °C
910
920
930
940
950
960
970
40
20
0
20
40
60
80
100
120
PoE
Current
Limit
mA
G002
Pulsed Current Measurement
(VVDD VVSS) PoE Voltage V
0
1
2
3
4
5
6
7
8
0
2
4
6
8
10
I V
D
Bias
Current
A
G001
40
°C
25
°C
125
°C
TPS23754
TPS23754-1
TPS23756
www.ti.com
SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009
A minimum 0.47
μF capacitor, located adjacent to the VC pin, should be connected from VC to COM to bypass
the gate driver. A larger total capacitance is required for startup to provide control power between the time the
converter starts switching and the availability of the converter auxiliary output voltage.
VDD
VDD is the positive input power rail that is derived from the PoE source (PSE). VDD should be bypassed to VSS
with a 0.1
μF capacitor as required by the IEEE standard. A transient suppressor diode (TVS), a special type of
Zener diode, such as SMAJ58A should be connected from VDD to VSS to protect against over-voltage transients.
VDD1
VDD1 is the dc/dc converter startup supply. Connect to VDD for many applications. VDD1 may be isolated by a
diode from VDD to support PoE priority operation.
VSS
VSS is the PoE input-power return side. It is the reference for the PoE interface circuits, and has a current-limited
hotswap switch that connects it to RTN. VSS is clamped to a diode drop above RTN by the hotswap switch.
A local VSS reference plane should be used to connect the input bypass capacitor, TVS, RCLS, and the
PowerPad. This plane becomes the main heatsink for the TPS23754.
VSS is internally connected to the PowerPAD.
PowerPAD
The Powerpad is internally connected to VSS. It should be tied to a large VSS copper area on the PCB to provide
a low resistance thermal path to the circuit board. It is recommended that a clearance of 0.025” be maintained
between VSS, RTN, and various control signals to high-voltage signals such as VDD and VDD1.
TYPICAL CHARACTERISTICS
DETECTION BIAS CURRENT
PoE CURRENT LIMIT
vs
VOLTAGE
TEMPERATURE
Figure 3.
Figure 4.
Copyright 2008–2009, Texas Instruments Incorporated
11
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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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