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L7980ATR bảng dữ liệu(PDF) 12 Page - STMicroelectronics

tên linh kiện L7980ATR
Giải thích chi tiết về linh kiện  2 A step-down switching regulator
PDF  44 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L7980ATR bảng dữ liệu(HTML) 12 Page - STMicroelectronics

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Functional description
L7980
12/44
Doc ID 15181 Rev 4
In continuos conduction mode (CCM), the transfer function of the power section has two
poles due to the LC filter and one zero due to the ESR of the output capacitor. Different
kinds of compensation networks can be used depending on the ESR value of the output
capacitor. In case the zero introduced by the output capacitor helps to compensate the
double pole of the LC filter a type II compensation network can be used. Otherwise, a type
III compensation network has to be used (see Chapter 6.4 for details about the
compensation network selection).
Anyway the methodology to compensate the loop is to introduce zeros to obtain a safe
phase margin.
Table 5.
Uncompensated error amplifier characteristics
Low frequency gain
100dB
GBWP
4.5MHz
Slew rate
7V/
μs
Output voltage swing
0 to 3.3V
Maximum source/sink current
17mA/25mA



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