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| 型号： | TPS23757PWR |
| 厂商： | Texas Instruments |
| 文件页数： | 30/39页 |
| 文件大小： | 0K |
| 描述： | IC POE INTERFACE SWITCH 20TSSOP |
| 标准包装： | 2,000 |
| 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： | 带卷 (TR) |
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TPS23757
SLVS948D – JULY 2009 – REVISED NOVEMBER 2013
www.ti.com
Option 1 ORing of a low voltage adapter (e.g., 24 V) is possible by connecting a resistor divider to PPD as in
Figure 30 . When 1.55 V ≤ V PPD ≤ 8.3 V, the hotswap MOSFET is enabled, APb is activated, and the class
feature is disabled. The hotswap current limit is unaffected, limiting the available power. For example, the
maximum input power from a 24 V adapter would be 9.3 W [(24 V – 0.6 V) × 0.4 A].
DEN
PPD
CLS
V SS
D A
APD
R PPD1
Adapter
Figure 30. Low-Voltage Option 1 ORing
Softstart
Converters require a softstart on the voltage error amplifier to prevent output overshoot on startup. Figure 31
shows a common implementation of a secondary-side softstart that works with the typical TLV431 error amplifier.
The softstart components consist of D SS , R SS , and C SS . They serve to control the output rate-of-rise by pulling
V CTL down as C SS charges through R OB , the optocoupler, and D SS . This has the added advantage that the
TLV431 output and C IZ are preset to the proper value as the output voltage reaches the regulated value,
preventing voltage overshoot due to the error amplifier recovery. The secondary-side error amplifier will not
become active until there is sufficient voltage on the secondary. The TPS23757 provides a primary-side softstart
which persists long enough (~4 ms) for secondary side voltage-loop softstart to take over. The primary-side
current-loop softstart controls the switching MOSFET peak current by applying a slowly rising ramp voltage to a
second PWM control input. The PWM is controlled by the lower of the softstart ramp or the CTL-derived current
demand. The actual output voltage rise time is usually much shorter than the internal softstart period. Initially the
internal softstart ramp limits the maximum current demand as a function of time. Either the current limit,
secondary-side softstart, or output regulation assume control of the PWM before the internal softstart period is
over. Figure 21 shows a smooth handoff between the primary and secondary-side softstart with minimal output
voltage overshoot.
From Regulated
Output Voltage
R SS
D SS
C SS
R OB
C IZ
R FBU
R FBL
TLV431
Figure 31. Error Amplifier Soft Start
30
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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 |
|---|---|
| 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 |
| TPS2375DRG4 | 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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