參數(shù)資料
型號(hào)： LT1317IS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Micropower, 600kHz PWM DC/DC Converters
中文描述： 1.35 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 447K
代理商： LT1317IS8
10
LT1317/LT1317B
FREQUENCY COMPENSATION
The LT1317 has an external compensation pin (V
C
) which
allows the frequency response to be optimized for the
circuit configuration. In most cases, the values used in
Figure 1 will work. Some circuits may need additional
compensation and a simple trial and error method for
determining the necessary component values is given.
Figure 6 shows the test setup. A load step is applied and
the resulting output voltage waveform is observed. Fig-
ures 7 through 10 detail the response for various values of
R and C in the compensation network. The circuit of
Figure 7 starts with a large C and small R giving a highly
overdamped system. This system will always be stable but
the output voltage displays a long settling time of >5ms.
Figure 8’s circuit has reduced C giving a shorter settling
time but still overdamped. Figure 9 shows the results
when C is reduced to the point where the system becomes
underdamped. The output voltage responds quickly
(
≈
200
μ
s to 300
μ
s) but some ringing exists. Figure 10 has
APPLICATIO
S I
N
FOR
ATIO
U
W
U
optimum R and C values giving the best possible settling
time with adequate phase margin.
An additional 100pF capacitor (C
C2
) is connected to the V
C
pin and is necessary if the LT1317 is operated near current
limit. Also, C
C2
should be present when higher ESR output
capacitors are used.
Figure 6. Frequency Response Test Setup
V
IN
SW
FB
LT1317
10
μ
H
MBR0520L
SHDN
R
604k
50
V
OUT
3.3V
1M
15
2W
C
C
100pF
1317 F06
V
C
GND
V
IN
2V
47
μ
F
47
μ
F
+
+
1ms/DIV
1317 F09
I
LOAD
2mA TO
200mA
V
OUT
100mV/DIV
AC COUPLED
1ms/DIV
1317 F10
I
LOAD
2mA TO
200mA
V
OUT
100mV/DIV
AC COUPLED
5ms/DIV
1317 F07
I
LOAD
2mA TO
200mA
V
OUT
100mV/DIV
AC COUPLED
5ms/DIV
1317 F08
I
LOAD
2mA TO
200mA
V
OUT
100mV/DIV
AC COUPLED
Figure 8. Reducing C to 22nF
Speeds Up the Response. (R = 33k)
Figure 10. 3.3nF and 33k Gives the
Shortest Settling Time with No Ringing.
Figure 9. Using 680pF for C Results in an
Underdamped System with Ringing. (R = 33k)
Figure 7. With C = 56nF and R = 33k,
the System is Highly Overdamped.
相關(guān)PDF資料
PDF描述
LT1317BCMS8 Micropower, 600kHz PWM DC/DC Converters
LT1317 Micropower, 600kHz PWM DC/DC Converters
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LT1317BCS8 8-Bit Identity/Magnitude Comparators (P=Q) with Enable 20-SO 0 to 70
LT1317CMS8 8-Bit Identity/Magnitude Comparators (P=Q) with Enable 20-SO 0 to 70
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