參數(shù)資料
型號(hào)： LT1307IS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Single Cell Micropower 600kHz PWM DC/DC Converters
中文描述： 1.25 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 11/20頁(yè)
文件大小： 377K
代理商： LT1307IS8
11
LT1307/LT1307B
APPLICATIO
S I
FOR
ATIO
U
W
U
U
51mA
1mA
I
L
5ms/DIV
1307 F11a
V
200mV/DIV
AC COUPLED
Figure 11a. V
C
Pin Left Unconnected. Output Ripple
Voltage is 300mV
P-P
Under Load
51mA
1mA
I
L
5ms/DIV
1307 F11b
Figure 11b. Inclusion of a 100k/22nF Series RC on V
C
Pin Results in Overdamped Stable Response
V
200mV/DIV
AC COUPLED
51mA
1mA
I
L
1ms/DIV
1307 F11a
V
200mV/DIV
AC COUPLED
Figure 11c. Reducing C to 2nF Speeds Up Response,
Although Still Overdamped
51mA
1mA
I
L
500
μ
s/DIV
1307 F11b
Figure 11d. A 100k/200pF Series RC Shows Some
Underdamping
V
200mV/DIV
AC COUPLED
51mA
1mA
I
L
1ms/DIV
1307 F11b
Figure 11e. A 100k/680pF RC Provides Optimum
Settling Time with No Ringing
V
200mV/DIV
AC COUPLED
pole, requiring added C at the V
C
pin network to prevent
loop oscillation.
Observant readers will notice R has been set to 100k for all
the photos in Figure 11. Usable R values can be found in
the 10k to 500k range, but after too many trips to the
resistor bins, 100k wins.
underdamping. Now settling time is about 300
μ
s. Increas-
ing C to 680pF results in the response shown in Figure 11e.
This response has minimum settling time with no over-
shoot or underdamping.
Converters using a 2-cell input need more capacitance at
the output. This added capacitance moves in the output
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參數(shù)描述
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