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參數(shù)資料
| 型號： | MAX5984AETI+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CTRLR PD IEEE W/MOSFT 28TQFN |
| 標準包裝： | 2,500 |
| 系列： | * |
______________________________________________________________________________________ 19
MAX5984
Single-Port, 40W, IEEE 802.3af/802.3at PSE
Controller with Integrated MOSFET
The MAX5984 also contains an internal square wave,
PWM signal generator. The PWM runs at a typical fre-
quency of 25kHz with an approximate typical duty cycle
of 6.25%. PWMEN is used to enable or disable the PWM.
PWMEN is internally pulled up to the digital supply, and
can be left unconnected to enable the internal PWM.
When enabled, the LED pulses are driven by the PWM
to reduce the power dissipation and increase the system
efficiency. Force PWMEN low to disable the internal
PWM; the LED is then driven directly.
Thermal Shutdown
If the MAX5984 die temperature reaches +150NC, an
overtemperature fault is generated and the device shuts
down. The die temperature must cool down below 130NC
to remove the overtemperature fault condition. After a
thermal shutdown condition clears, the device is reset.
Applications Information
Layout Procedure
Careful PCB layout is critical to achieve high efficiency
and low EMI. Follow these layout guidelines for optimal
performance.
1) Place the input bypass capacitance and the output
bypass capacitor (0.1F ceramic capacitor from
AGND to OUTP) as close as possible to the MAX5984.
2) Use large SMT component pads for power dissipat-
ing devices such as the MAX5984 and the external
diodes in the high-power path.
3) Use short, wide traces whenever possible for high-
power paths.
4) Use the MAX5971 Evaluation Kit as a design and
layout reference.
5) The exposed pad (EP) must be soldered evenly to the
PCB ground plane for proper operation and power
dissipation. Use multiple vias beneath the exposed
pad for maximum heat dissipation. A 1.0mm to
1.2mm pitch is the recommended spacing for these
vias and they should be plated (1oz copper) with a
small barrel diameter (0.30mm to 0.33mm).
Figure 6. Typical Operating Circuit 1 (DC Load Removal Detection, Internal PWM Enabled for LED Indication, and Class 5
Detection Enabled)
1N4448
1kI
1nF
-54V
5.1kI
LED
10mH
1N4448
0.1F
100V
47F
100V
-54V
LED
AGND
EN
VEE
VEE_DIG
LEGACY
MIDSPAN
OSC
OUT
OUTP
DET
ILIM1
ILIM2
PWMEN
MAX5984C
0.1F
100V
SMJ58A
2.2MI
PSE OUTPUT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5984BETI+ | 制造商:Maxim Integrated Products 功能描述:SINGLE-PORT 40W IEEE 802.3AF/AT PSE CONTROLLER WITH INTEGRAT - Rail/Tube |
| MAX5984CETI+ | 制造商:Maxim Integrated Products 功能描述:SINGLE-PORT 40W IEEE 802.3AF/AT PSE CONTROLLER WITH INTEGRAT - Rail/Tube |
| MAX5984DETI+ | 功能描述:其他電源管理 1-Port 40W IEEE 802.3af/at PSE Ctlr RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| MAX5984DETI+T | 功能描述:其他電源管理 1-Port 40W IEEE 802.3af/at PSE Ctlr RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| MAX5986AETE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 IEEE802.3 af PD w/ DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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