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參數(shù)資料
| 型號： | LTC1735-1 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 23/32頁 |
| 文件大?。?/td> | 373K |
| 代理商： | LTC1735-1 |
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23
LTC1735
At full load current:
V
A
A
V A
/
V
V
ITH MAX
(
P P
2
)
0 084
.
.
=
+
1 77
+
=
15
5
0 3
At minimum load current:
V
A
A
V A
/
V
V
ITH MIN
(
P P
2
)
.
0 084
.
.
=
+
0 40
+
=
0 2
2
0 3
In this circuit, V
ITH
changes from 0.40V at light load to
1.77V at full load, a 1.37V change. Notice that
I
L
, the
peak-to-peak inductor current, changes from light load to
full load. Increasing the DC inductor current decreases the
permeability of the inductor core material, which de-
creases the inductance and increases
I
L
. The amount of
inductance change is a function of the inductor design.
To create the
±
30mV input offset, the gain of the error
amplifier must be limited. The desired gain is:
A
V
InputOffsetError
Connecting a resistor to the output of the transconductance
error amplifier will limit the voltage gain. The value of this
resistor is:
A
Error Amplifier g
m
V
V
V
ITH
=
=
=
1 37
2 0 03
( .
22 8
.
)
.
R
ms
k
ITH
V
=
=
=
22 8
1 3
.
17 54
.
.
To center the output voltage variation, V
ITH
must be
centered so that no I
TH
pin current flows when the output
voltage is nominal. V
ITH(NOM)
is the average voltage be-
tween V
ITH
at maximum output current and minimum
output current:
V
V
V
V
V
V
V
V
ITH NOM
(
ITH MAX
(
ITH MIN
(
ITH MIN
(
)
)
)
)
–
2
.
–0 40
2
.
.
=
+
=
+
=
1 77
0 40
1 085
APPLICATIU
W
U
U
The Thevenin equivalent of the gain limiting resistance
value of 17.54k is made up of a resistor R4 that sources
current into the I
TH
pin and resistor R1 that sinks current
to SGND.
To calculate the resistor values, first determine the ratio
between them:
k
V
V
V
V
1 085
V
V
INTVCC
ITH NOM
(
ITH NOM
(
=
=
=
–
.
–1 085
.
.
)
)
5 2
3 79
V
INTVCC
is equal to V
EXTVCC
or 5.2V if EXTV
CC
is not used.
Resistor R4 is:
R
k
R
k
ITH
4
1
(3 79 1 17 54
84 0
=
+
=
=
(
)
)
.
.
Resistor R1 is:
R
k
R
k
k
k
ITH
1
1
3 79
.
22 17
.
=
+
=
=
(
)
(3 79 1 17 54
)
.
Unfortunately, PCB noise can add to the voltage developed
across the sense resistor, R5, causing the I
TH
pin voltage
to be slightly higher than calculated for a given output
current. The amount of noise is proportional to the output
current level. This PCB noise does not present a serious
problem but it does change the effective value of R5 so the
calculated values of R1 and R4 may need to be adjusted to
achieve the required results. Since PCB noise is a function
of the layout, it will be the same on all boards with the same
layout.
Figures 9 and 10 show the transient response before and
after active voltage positioning is implemented. Notice
that active voltage positioning reduced the transient re-
sponse from almost 200mV
P-P
to a little over 100mV
P-P
.
Refer to Design Solutions 10 for more information about
active voltage positioning.
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| LTC1735CS | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
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