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参数资料
| 型号： | TPS40061PWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSOOP-16 |
| 文件页数： | 7/33页 |
| 文件大小： | 750K |
| 代理商： | TPS40061PWPG4 |
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A
MOD +
V
IN
V
S
or
A
MOD(db) + 20
log
V
IN
V
S
(19)
D +
V
O
V
IN
+
V
C
V
S
or
V
O
V
C
+
V
IN
V
S
(20)
Calculate the Poles and Zeros
f
LC +
1
2p
L
C
O
(Hz)
(21)
f
Z +
1
2p
ESR
C
O
(Hz)
(22)
R
BIAS +
0.7
R1
V
OUT * 0.7
W
(23)
f
C +
f
SW
4
(Hertz)
(24)
SLUS543E – DECEMBER 2002 – REVISED JUNE 2006
APPLICATION INFORMATION (continued)
Duty dycle, D, varies from 0 to 1 as the control voltage, VC, varies from the minimum ramp voltage to the
maximum ramp voltage, VS. Also, for a synchronous buck converter, D = VO / VIN. To get the control voltage to
output voltage modulator gain in terms of the input voltage and ramp voltage,
For a buck converter using voltage mode control there is a double pole due to the output L-CO. The double pole
is located at the frequency calculated in Equation 21.
There is also a zero created by the output capacitance, CO, and its associated ESR. The ESR zero is located at
the frequency calculated in Equation 22.
Calculate the value of RBIASto set the output voltage, VOUT.
The maximum crossover frequency (0 dB loop gain) is calculated in Equation 24.
Typically, fC is selected to be close to the midpoint between the L-CO double pole and the ESR zero. At this
frequency, the control to output gain has a –2 slope (-40 dB/decade), while the Type III topology has a +1 slope
(20 dB/decade), resulting in an overall closed loop –1 slope (–20 dB/decade). Figure 9 shows the modulator
gain, L-C filter, output capacitor ESR zero, and the resulting response to be compensated.
A Type III topology, shown in Figure 10, has two zero-pole pairs in addition to a pole at the origin. The gain and
phase boost of a Type III topology is shown in Figure 11. The two zeros are used to compensate the L-CO
double pole and provide phase boost. The double pole is used to compensate for the ESR zero and provide
controlled gain roll-off. In many cases the second pole can be eliminated and the amplifier's gain roll-off used to
roll-off the overall gain at higher frequencies.
15
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