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器件3D模型￥ 7.192
LM5005MHX 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
DC/DC转换器
封装:
TSSOP-20
描述:
LM5005高电压2.5安培降压稳压器 LM5005 High Voltage 2.5 Amp Buck Regulator
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引脚图在P3P4Hot
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标记信息在P33
封装信息在P32P33P34P35P36
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LM5005MHX数据手册
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REF LEVEL
0.000 dB
0.0 deg
100 1k
START 50.000 Hz
10k
STOP 50 000.000 Hz
/DIV
10.000 dB
45.000 deg
0
GAIN
PHASE
REF LEVEL
0.000 dB
0.0 deg
100 1k
START 50.000 Hz
10k
STOP 50 000.000 Hz
/DIV
10.000 dB
45.000 deg
0
GAIN
PHASE
22
LM5005
SNVS397E –SEPTEMBER 2005–REVISED NOVEMBER 2016
www.ti.com
Product Folder Links: LM5005
Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated
Typical Application (continued)
The compensator's bode plot is shown by Figure 20. The overall loop is predicted as the sum (in dB) of the
modulator gain and the compensator gain as shown in Figure 21.
Figure 20. Compensator Gain and Phase Plot Figure 21. Overall Loop Gain and Phase Plot
If a network analyzer is available, measure the modulator gain and configure the compensator gain for the
desired loop transfer function. If a network analyzer is not available, design the error amplifier's compensation
components using the guidelines provided. Perform step-load transient tests to verify acceptable performance.
The step load goal is minimum overshoot with a damped response. Add a capacitor C
C2
to the compensation
network to decrease noise susceptibility of the error amplifier. The value of C
C2
must be sufficiently small,
because the addition of this capacitor adds a pole in the compensator transfer function. This pole must be well
beyond the loop crossover frequency. A good approximation of the location of the pole added by C
C2
is
Equation 19.
f
p2
= f
Z
× C
C1
/ C
C2
(19)
An alternative method to decrease the error amplifier noise susceptibility is to connect a capacitor from COMP to
AGND. When using this method, the capacitance of C
C2
must not exceed 100 pF.
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