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參數資料
型號: TPS40200MDREPG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩壓器
英文描述: SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝: GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數: 8/43頁
文件大小: 1069K
代理商: TPS40200MDREPG4
www.ti.com
Voltage Setting and Modulator Gain
÷
è
+
=
1
2
OUT
R
1
708
.
0
V
(7)
K
PWM
V
g
V
c
d
+
V
ref
C
out
L
R
load
V
OUT
R
2
R
1
SGLS371 – JANUARY 2007
GENERAL INFORMATION (continued)
Since the input current to the error amplifier is negligible, the feedback impedance can be selected over a wide
range. Knowing that the reference voltage is 708 mV, pick a convenient value for R1 and then calculate the
value of R2 from the following formula:
Figure 30. System Gain Elements
The error amplifier has a DC open-loop gain of at least 60 dB, with a minimum of a 1.5-MHz gain bandwidth
product, which gives the user flexibility with respect to the type of feedback compensation used for this particular
application. The gain selected by the user at the crossover frequency is set to provide an overall unity gain for
the system. The crossover frequency should be selected so that the error amplifier open-loop gain is high with
respect to the required closed-loop gain. This ensures that the amplifier response is determined by the passive
feedback elements.
16
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相關代理商/技術參數
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