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参数资料
| 型号： | TPS2377DRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 22/24页 |
| 文件大小： | 579K |
| 代理商： | TPS2377DRG4 |
data sheet
www.ti.com............................................................................................................................................................ SLVS525B – APRIL 2004 – REVISED APRIL 2008
RTN: This pin provides the switched negative power rail used by the downstream circuits. The operational and
inrush current limit control current into the pin. The PG circuit monitors the RTN voltage and also uses it as the
return for the PG pin pulldown transistor. The internal MOSFET body diode clamps VSS to RTN when voltage is
present between VDD and RTN and the PoE input is not present.
PG: This pin goes to a high resistance state when the internal MOSFET that feeds the RTN pin is enabled, and
the device is not in inrush current limiting. In all other states except detection, the PG output is pulled to RTN by
the internal open-drain transistor. Performance is assured with at least 4 V between VDD and RTN.
PG is an open-drain output; therefore, it may require a pullup resistor or other interface.
UVLO: This pin is specific to the TPS2376; it is not internally connected on the TPS2375 and TPS2377. The
UVLO pin is used with an external resistor divider between VDD and VSS to set the upper and lower UVLO
thresholds. The hysteresis, as measured as a percentage of the upper UVLO, is the same as the TPS2375.
The TPS2376 enables the output when V(UVLO) exceeds the upper UVLO threshold. When current begins to flow,
VDD sags due to cable resistance and the dynamic resistance of the input diodes. The lower UVLO threshold
must be below the lowest voltage that the input reaches.
The TPS2376 implements adjustable UVLO thresholds, but is otherwise functionally equivalent to the TPS2375.
The TPS2375 offers fixed UVLO thresholds designed to maximize hysteresis while maintaining compatibility with
the IEEE 802.3af standard. The TPS2377 offers fixed UVLO thresholds optimized for use with legacy PoE
systems.
VDD: This is the positive input supply to the TPS2375, which is also common to downstream load circuits. This
pin provides operating power and allows the controller to monitor the line voltage to determine the mode of
operation.
Copyright 2004–2008, Texas Instruments Incorporated
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相关代理商/技术参数 |
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| TPS2377PW | 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 |
| TPS2377PWG4 | 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 |
| TPS2377PWR | 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 |
| TPS2377PWRG4 | 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 |
| TPS23785BPWP | 功能描述:热插拔功率分布 Hi-Pwr Hi-Eff PoE PD & DC-DC Cntlr 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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