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参数资料
| 型号： | SI3460-E02-GMR |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC POWER MANAGEMENT CTLR 11VQFN |
| 标准包装： | 500 |
| 应用： | 供电设备（PSE） |
| 电流 - 电源： | 500mA |
| 电源电压： | 2.7 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 供应商设备封装： | 11-QFN（3x3） |
| 包装： | 带卷 (TR) |
Si3460
4.3. Operating Mode Sequencing
4.3.1. Detection
After powerup and passing the UVLO threshold voltage of 10 V, the Si3460 enters into the detection state, with
FET M2 off and the dc-dc converter disabled so as to generate no output. Prior to turning on the PSE output FET
M2 and enabling the 250 kHz square wave for the dc-dc converter, a valid detection sequence must take place.
According to the IEEE specifications, the detection process consists of sensing a nominal 25 k ? signature
resistance in parallel with up to 0.15 μF of capacitance. To eliminate the possibility of false detection events, the
Si3460-EVB reference design performs a robust 3-point detection sequence by varying the voltage across the
sense bridge R1, R2, and R3. The fourth leg of the sense bridge is the load that connects to the drain of M2 and
returns to V EE via D8 and L1.
At the beginning of the detection sequence, V OUT is at zero output voltage for 250 ms. With a 10 k ? source
impedance, V OUT is then varied from 4.5 to 7.5 V and then back to 4.5 V for 20 ms at each level. If the PD's
signature resistance is in the RGOOD range of 19 to 26.5 k ? , the Si3460 proceeds to classification and powerup. If
the PD resistance is not in this range, the detection sequence repeats continuously.
Detection is sequenced approximately every 320 msec and repeats until RGOOD is sensed, indicating a valid PD
has been detected. The STATUS LED (D13) is flashed at the 320 ms rate in synchronization with the detection
process to indicate the PSE is searching for a valid PD.
4.3.2. Classification
After a valid PD is detected, the pass transistor, M2, and the PWM controller are turned on and programmed for an
output voltage of 18 V with a current limit of 75 mA. The current measured during the classification process
determines the class level of the PD. If the class level of the PD is not within the supported level as set by the initial
voltage on the Si3460's STATUS pin (refer to the Operating Mode Configuration section above), an error is
declared and the LED blinks rapidly. This is referred to as classification-based power denial. If the class level is in
the supported range, the Si3460 proceeds to powerup. This is referred to as classification-based power granting.
Table 9. Classification Levels
ISENSE Current
(Nominal)
< 6.5 mA
6.5mA to 14.5 mA
14.5 mA to 23 mA
> 23 mA
Classification
Level
Class 0
Class 1
Class 2
Class 3 or 4
Minimum Power
Level
15.4 W
4W
7W
15.4 W
Overload Current
Threshold I CUT (Max)
400 mA
98 mA
180 mA
400 mA
Overload Current
Limit I LIM (Max)
450 mA
450 mA
450 mA
450 mA
If the classification level is at a greater power than can be supported based on R28 and R30, an error condition is
reported by flashing the LED at a 10 Hz rate for two seconds before the state machine goes back to the detection
cycle.
4.3.3. Classification-Based Current Limiting
Current limits (I CUT )are set based on the classification voltage on the STATUS pin at powerup. Refer to Table 9 for
current limits.
12
Rev. 1.2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| Si3460-E03-GM | 功能描述:热插拔功率分布 Single-port PoE PSE I/F w/DC-DC ctrlr 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 |
| SI3460-E03-GMR | 功能描述:PMIC 解决方案 Single-port PoE PSE I-face DC-DC Ctrlr RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| Si3460-EVB | 功能描述:电源管理IC开发工具 Si3460 PSE Eval Brd and Ref Design Kit 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 |
| SI3460-XYY-GM | 制造商:SILABS 制造商全称:SILABS 功能描述:IEEE 802.3af PSE INTERFACE AND DC-DC CONTROLLER |
| SI3461 | 制造商:SILABS 制造商全称:SILABS 功能描述:SINGLE-PORT IEEE 802.3AT POE/POE+ PSE INTERFACE |
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