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PM8800ATR bảng dữ liệu(PDF) 23 Page - STMicroelectronics

tên linh kiện PM8800ATR
Giải thích chi tiết về linh kiện  Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source
PDF  35 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8800ATR bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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PM8800A
PWM section
23/35
6
PWM section
6.1
Error amplifier and loop compensation
The PM8800A addresses both isolated and non-isolated configuration by embedding a wide
band high gain error amplifier.
In non-isolated topology, the voltage to be regulated is connected to the FB pin - the
inverting input of the EA - through a resistor divider. The non inverting input of the EA is set
to a fixed reference value of 1.25 V. The output of the error amplifier is connected to the
COMP pin which is pulled up internally with a 2.5 k
Ω resistor to a fixed reference of 3.3 V;
loop compensation can be done connecting an appropriate compensation network between
the FB pin and the COMP pin
Figure 13.
Non-isolated feedback
In typical isolated topology, the error amplifier is located outside the IC and the feedback
signal is taken on the collector of an opto coupler. The internal error amplifier is to be
bypassed connecting the FB pin to AGND. In order to minimize external components count
the opto coupler is directly connected to the COMP pin using the internal pull-up resistor as
bias for the opto coupler.
Figure 14.
Isolated opto coupler feedback.
VFB
GND
COMP
Vout
-
+
1.25V
R1
R2
3.3V
2.5kOhm
E/A
AGND
ZCOMP
PM8800A
VFB
GND
COMP
Vout
CC
RZ
-
+
1.25V
R1
R2
3.3V
2.5k
E/A
AGND
PM8800A



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