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| 型号： | TPS23757PW |
| 厂商： | Texas Instruments |
| 文件页数： | 10/39页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR POE PD IEEE 20TSSOP |
| 标准包装： | 70 |
| 类型： | 以太网供电开关（PoE） |
| 应用： | 远程外设（工业控制，相机，数据访问） |
| 内部开关： | 是 |
| 电流限制： | 465mA |
| 电源电压： | 0 V ~ 57 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1012 (CN2011-ZH PDF) |
| 其它名称： | 296-24949-5 |
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TPS23757
SLVS948D – JULY 2009 – REVISED NOVEMBER 2013
www.ti.com
The PPD pin has a 5 μ A internal pull-down current.
Locate the PPD pull-down resistor adjacent to the pin when used.
PPD may be tied to V SS or left open when not used.
RTN, ARTN, COM
RTN is internally connected to the drain of the PoE hotswap MOSFET, while ARTN is the quiet analog return for
the dc/dc controller. COM serves as the return path for the gate drivers and should be tied to ARTN on the circuit
board. The ARTN / COM / RTN net should be treated as a local reference plane (ground plane) for the dc/dc
control and converter primary. RTN and (ARTN/COM) may be separated by several volts for special applications.
APb
APb is an active low output that indicates [ (V APD > 1.5 V) OR (1.55 V ≤ V PPD ≤ 8.3 V) ]. APb is valid after both a
delay of t APb from the start of converter switching, and [V CTL ≤ (V B – 1 V)]. Once APb is valid, V CTL will not effect
it. APb will become invalid if the converter goes back into softstart, overtemperature, or is held off by the PD
during C IN recharge (inrush). APb is referenced to ARTN and is intended to drive the diode side of an
optocoupler. APb should be left open or tied to ARTN if not used.
V B
V B is an internal 5.1 V regulated dc/dc controller supply rail that is typically bypassed by a 0.1 μ F capacitor to
ARTN. V B should be used to bias the feedback optocoupler.
V C
V C is the bias supply for the dc/dc controller. The MOSFET gate drivers run directly from V C . V B is regulated
down from V C , and is the bias voltage for the rest of the converter control. A startup current source from V DD1 to
V C is controlled by a comparator with hysteresis to implement the converter bootstrap startup. V C must be
connected to a bias source, such as a converter auxiliary output, during normal operation.
A minimum 0.47 μ F capacitor, located adjacent to the V C pin, should be connected from V C 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.
V DD
V DD is the positive input power rail that is derived from the PoE source (PSE). V DD should be bypassed to V SS
with a 0.1 μ F capacitor as required by the IEEE standard. A transient suppressor diode (TVS), such as SMAJ58A
should be connected from V DD to V SS to protect against overvoltage transients.
V DD1
V DD1 is the dc/dc converter startup supply. Connect to V DD for many applications. V DD1 may be isolated by a
diode from V DD to support PoE priority operation.
V SS
V SS 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. V SS is clamped to a diode drop above RTN by the hotswap switch.
A local V SS reference plane should be used to connect the input bypass capacitor, TVS, and R CLS .
10
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Copyright ? 2009–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| TPS2375D | 制造商:Texas Instruments 功能描述:POWER OVER ETHERNET ((NW)) |
| TPS2375DG4 | 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 |
| TPS2375DR | 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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