參數(shù)資料
型號(hào)： LTC1703
廠商： Linear Technology Corporation
元件分類(lèi)： 通用總線功能
英文描述： Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70
中文描述： 雙550kHz的同步二相開(kāi)關(guān)穩(wěn)壓控制器5位VID
文件頁(yè)數(shù)： 20/36頁(yè)
文件大?。?/td> 343K
代理商： LTC1703
20
LTC1703
from
C
IN
(time point A). 50% of the way through, TG2
turns on and the total current is 13A (time point B).
Shortly thereafter, TG1 turns off and the current drops to
10A (time point C). Finally, TG2 turns off and the current
spends a short time at 0 before TG1 turns on again (time
point D).
AVG
=
(
(
Now we can calculate the RMS current. Using the same
waveform we used to calculate the average DC current,
subtract the average current from each of the DC values.
Square each current term and multiply the squares by the
same period percentages we used to calculate the aver-
age DC current. Sum the results and take the square root.
The result is the approximate RMS current as seen by the
input capacitor with both sides of the LTC1703 at full load.
Actual RMS current will differ due to inductor ripple
I
A
A
A
A
A
)
+
(
0 16
)
+
)
+
(
)
=
3
0 5
13
0 16
10
0
0 18
5 18
.
current and resistive losses, but this approximate value is
adequate for input capacitor calculation purposes.
=
(
(
=
.
4 55
If the circuit is likely to spend time with one side operating
and the other side shut down, the RMS current will need
to be calculated for each possible case (side 1 on, side 2
off; side 1 off, side 2 on; both sides on). The capacitor
must be sized to withstand the largest RMS current of the
three—sometimes this occurs with one side shut down!
I
A
RMS
RMS
)
+
(
)
+
(
)
+
)
–2 18
0 5
.
0 16
.
0 16
–5 18
0 18
7 82
4 82
2
2
2
2
Side only
I
AVE
A
A
A
I
A
Side only
I
AVE
A
A
A
I
RMS
RMS
RMS
1
3
0 67
0
0 33
2 01
.
)
=
1
0 67
2
0 33
1 42
.
2
10
0 32
0
0 68
3 2
.
)
6 8
.
0 32
–3 2
0 68
1
1
2
2
2
2
2
2
:
–
:
=
(
=
(
)
+
(
)
+
(
)
=
=
(
=
(
=
4 66
)
+
(
)
=
)
+
(
4 55
.
.
A
A
RMS
RMS
>
C
onsider the case where both sides are operating at the
same load, with a 50% duty cycle at each side. The RMS
current with both sides running is near zero, while the
RMS current with one side active is 1/2 the total load
current of that side.
TIME
0
A
B
C
D
50%
16% 16% 18%
–5.2
A
0
–2.2
4.8
7.8
1703 SB2
Figure SB2. AC Current Calculation
In our hypothetical 1.6V, 10A example, we'd set the ripple
current to 40% of 10A or 4A, and the inductor value would
be:
(
(
)
L
t
V
I
s
3
V
A
H
with t
V
V
kHz
s
ON QB
OUT
RIPPLE
ON QB
(
=
)
=
μ
(
)(
)
=
μ
=
=
μ
)
.
.
.
.
5
/
.
1 2
1 6
0 64
1
1 6
550
1 2
The inductor must not saturate at the expected peak
current. In this case, if the current limit was set to 15A, the
inductor should be rated to withstand 15A + 1/2 I
RIPPLE
,
or 17A without saturating.
APPLICATIOU
W
U
U
相關(guān)PDF資料
PDF描述
LTC1703CG Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70
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LTC1705 Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
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LTC1703CG#TRPBF 功能描述:IC REG SW DUAL SYNC VID 28SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專(zhuān)用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
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