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PM8801 bảng dữ liệu(PDF) 24 Page - STMicroelectronics

tên linh kiện PM8801
Giải thích chi tiết về linh kiện  High-efficiency, IEEE 802.3at compliant, integrated PoE-PD interface and PWM controller
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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PM8801 bảng dữ liệu(HTML) 24 Page - STMicroelectronics

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PD interface
PM8801
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DocID018560 Rev 2
In case of thermal shutdown, MPS is released, making sure that current consumption is
below the threshold and allowing the PSE to detach the PD.
When the PM8801 is powered by an auxiliary source (see Section 6 ), the MPS current is
not activated.
Figure 10. Sleep mode with pulsed MPS current
Ch1: ENSL, Ch2: VSS-RTN. Ch3: Iinput, Ch4: 5Vout
4.7
LED driving
The PM8801 features a current-driven LED output. The LED is enabled when the ENDC pin
is driven high, or automatically enabled in sleep mode.
The LED driver sources a PWM current at 250 Hz frequency and 12 mA typical amplitude.
The LED brightness is adjustable connecting a resistor RDC at 1% accuracy between DIM
and VSS. The correspondence between duty-cycle and resistor values are shown in the
following Table 8.
Table 8. LED duty cycle selection
LED duty cycle D
RD [Ω]
0>1 M
15%
453 k
33%
243 k
47%
162 k
75%
110 k



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