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| 型号： | TPS40195RGYR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封装： | GREEN, PLASTIC, QFN-16 |
| 文件页数： | 20/43页 |
| 文件大小： | 1086K |
| 代理商： | TPS40195RGYR |
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IN
PW M
RAMP
V
K
V
@
(36)
(
)
( )
OUT
LC
2
OUT
1 s ESR C
K
L
1 s
s
L
C
R
+
=
+
+
÷
è
(37)
(
)
( )
OUT
IN
e
PWM
LC
2
RAMP
OUT
1 s ESR C
V
G (s)
K
V
L
1 s
s
L
C
R
+
=
=
+
+
÷
è
(38)
IN
RAMP
V
DC gain
20 LOG
20 LOG(12)
21.6 dB
V
=
=
=
÷
è
(39)
fLC_Pole
OUT
1
5.8k Hz
2
L
C
=
p
(40)
ESR_Zero
OUT
1
f
318 k Hz
2
ESR C
=
p
(41)
60
30
10
0
10
30
50
100
1 k
10 k
1 M
100 k
40
20
Double
Pole
LC Slope
40 dB/decade
f Frequency Hz
Gain
dB
www.ti.com ........................................................................................................................................ SLUS720D – FEBRUARY 2007 – REVISED NOVEMBER 2008
The gain of the output LC filter is given in Equation 37.
The equation for the PWM and LC gain is:
To plot this on a Bode plot the DC gain must be expressed in dB. The DC gain is equal to KPWM. To express this
in dB we take its LOG and multiple by 20. For this converter the DC gain is:
Also the pole and zero frequencies should be calculated. A double pole is associated with the LC and a zero is
associated with the ESR of the output capacitance. The frequency at where these occur can be calculated using
A Bode plot of the PWM and LC filter is shown in Figure 25.
Figure 25. PWM and L-C Filter Gain
Copyright 2007–2008, Texas Instruments Incorporated
27
Product Folder Link(s): TPS40195
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