TPS2371
PoE (パワー オーバー イーサネット) PD (受電側) 向け、以前の規格である IEEE802.3af との互角性確保、電源インターフェイス スイッチ
TPS2371
- Integrated Power Interface Switch for IEEE 802.3af Powered Devices (PDs)
- Precision UVLO Thresholds
- 20-ms UVLO Off-Time Delay
- Provides PD Detection Signature
- Provides PD Classification Signature (Class 0-4)
- Programmable Inrush Current Limit
- Internal 0.3-
Low-Side FET
- Interfaces to DC/DC Soft-Start for DC/DC Enable
- Internal Thermal Protection – Disconnects PD Load
- 8-Pin SOIC, 8-Pin TSSOP Packages
- APPLICATIONS
- VoIP Phones
- Internet Appliances
- Wireless LAN Access Points
- Bluetooth™ Access Points
Bluetooth is a trademark of the Bluetooth SIG, Inc.
Acting as an interface between the Power Source
Equipment (PSE) and the Powered Device (PD),
the TPS2371 performs all detection, classification,
inrush current limiting, and switch FET
control that is necessary for compatibility with
Legacy/IEEE 802.3af Standard. The TPS2371
incorporates precision UVLO thresholds and
hysteresis as well as a UVLO off-time delay to
enable Legacy IEEE802.3af PoE compatibilty. An
internal 0.3- FET provides maximum power
delivery. As an additional feature, the TPS2371
interfaces with the enable/soft-start signal of a
dc-to-dc converter, eliminating the need to have
an accurate UVLO in the dc-to-dc converter.
At low input voltages (1.8 V to 10 V), the TPS2371
draws less than 12 µA, allowing accurate sensing
of the external 24.9-k discovery resistor. At input
voltages between 15 V and 20 V, an external
resistor sets the level of current to be drawn during
classification mode. TPS2371 is compatible with
current as well as voltage measurement schemes
for classification. Above 20-V input, the
classification current is shut off, reducing internal
power dissipation.
The TPS2371 drives an internal low-side FET for control of the return side of the power path. The internal FET is turned on when the input voltage reaches 36 V and above. When the input voltage decreases, the FET remains on until the input voltage drops to below 30 V.
During initial turn-on of the switch (inrush mode), an external resistor is used to program the inrush current, allowing a wide range of capacitor values to be used at the load. According to IEEE 802.3af specification, inrush current of 400 mA is allowed only for 50 ms, limiting the load capacitor to approximately 180 µF. A programmable inrush current limit removes this limitation, allowing a larger capacitor to be used with a lower inrush current limit.
技術資料
種類 | タイトル | 最新の英語版をダウンロード | 日付 | |||
---|---|---|---|---|---|---|
* | データシート | TPS2371 Legacy データシート (Rev. A) | 2003年 10月 17日 |
購入と品質
- RoHS
- REACH
- デバイスのマーキング
- リード端子の仕上げ / ボールの原材料
- MSL 定格 / ピーク リフロー
- MTBF/FIT 推定値
- 使用原材料
- 認定試験結果
- 継続的な信頼性モニタ試験結果
- ファブの拠点
- 組み立てを実施した拠点