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參數(shù)資料
| 型號： | LT1766HGN#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 228 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 2/28頁 |
| 文件大?。?/td> | 284K |
| 代理商： | LT1766HGN#TR |
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10
LT1766/LT1766-5
1766fb
should be used if resistors are increased beyond the
suggested values and short-circuit conditions occur with
high input voltage. High frequency pickup will increase
and the protection accorded by frequency and current
foldback will decrease.
CHOOSING THE INDUCTOR
For most applications, the output inductor will fall into the
range of 15
H to 100H. Lower values are chosen to
reduce physical size of the inductor. Higher values allow
more output current because they reduce peak current
seen by the LT1766 switch, which has a 1.5A limit. Higher
values also reduce output ripple voltage.
When choosing an inductor you will need to consider
output ripple voltage, maximum load current, peak induc-
tor current and fault current in the inductor. In addition,
other factors such as core and copper losses, allowable
component height, EMI, saturation and cost should also
be considered. The following procedure is suggested as a
way of handling these somewhat complicated and con-
flicting requirements.
Output Ripple Voltage
Figure 3 shows a typical output ripple voltage waveform
for the LT1766. Ripple voltage is determined by ripple
current (ILP-P) through the inductor and the high
frequency impedance of the output capacitor. The follow-
ing equations will help in choosing the required inductor
APPLICATIO S I FOR ATIO
WU
UU
value to achieve a desirable output ripple voltage level. If
output ripple voltage is of less importance, the subse-
quent suggestions in Peak Inductor and Fault Current
and EMI will additionally help in the selection of the
inductor value.
Peak-to-peak output ripple voltage is the sum of a triwave
(created by peak-to-peak ripple current (ILP-P) times ESR)
and a square wave (created by parasitic inductance (ESL)
and ripple current slew rate). Capacitive reactance is
assumed to be small compared to ESR or ESL.
V
I
ESR
ESL
dI
dt
RIPPLE
LP P
=
()( )+()
-
Figure 2. Frequency and Current Limit Foldback
–
+
1.2V
BUFFER
VSW
L1
VC
GND
TO SYNC CIRCUIT
1766 F02
TO FREQUENCY
SHIFTING
R3
1k
R4
2k
R1
C1
R2
5k
OUTPUT
5V
ERROR
AMPLIFIER
FB
1.4V
Q1
LT1766
Q2
+
Figure 3. LT1766 Ripple Voltage Waveform
2.5
s/DIV
40mV/DIV
VOUT AT IOUT = 1A
VOUT AT IOUT = 0.1A
INDUCTOR CURRENT
AT IOUT = 1A
INDUCTOR CURRENT
AT IOUT = 0.1A
0.5A/DIV
VIN = 40V
VOUT = 5V
L = 47
H
C = 100
F, 10V, 0.1
1766 F03
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