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參數資料
| 型號： | ADP3160 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 5-Bit Programmable 2-Phase Synchronous Buck Controller |
| 中文描述： | 5位可編程2相同步降壓控制器 |
| 文件頁數： | 12/16頁 |
| 文件大小： | 292K |
| 代理商： | ADP3160 |
REV. B
–12–
ADP3160/ADP3167
sensing when the current threshold has been reached and when
the high-side MOSFET actually turns off. These two factors are
combined with the inherent voltage at the output of g
m
amplifier
that commands a current sense threshold of 0 mV (V
GNL0
):
V
V
I
R
n
V
V
L
t
R
n
GNL
GNL
L RIPPLE
(
SENSE
I
IN
AVG
D
SENSE
I
=
+
￥
￥
-
-
￥
￥
￥
￥
(
)
0
2
2
)
V
V +
m
V –1 635
600
V
nH
ns
m
12. =1 201
V
GNL
=
￥
￥
￥
￥
￥
￥
1
12. A
4
12.
2
12
2
60
4
W
W
–
(23)
The output voltage at no load (V
ONL
) can be calculated by
starting with the VID setting, adding in the positive offset (V+),
subtracting half the ripple voltage, and then subtracting the
dominant error terms:
V
V
V
R I
V
k
k
V
V
ONL
VID
VID
VID
RT
WIN
VID
=
+
-
-
￥
+
￥
ê
ˉ
+
D
2
2
2
(24)
V
V
V
m
A
V
mV
V
V
ONL
=
+
-
W ￥
2
￥
+
￥
ê
ˉ
=
1 7
.
0
1 38
.
9 9
.
1 7
.
(0 007
0 02
.
94
1 7
1 681
.
2
2
–
)
.
With these two terms calculated, the divider resistors (R
A
for the upper and R
B
for the lower) can be calculated.
Assuming that the internal resistance of the g
m
amplifier
(R
OGM
) is 200 k
W
:
R
V
V
V
R
g
V
(
V
B
REF
REF
GNL
T
m
ONL
VID
=
-
￥
-
–
)
(25)
R
V
V
7 57
.
V
k
mmho
V
V
k
B
=
-
W
-
￥
=
W
3
3
1 2
.
2 2
.
(1 681
–1 7
10 73
.
)
Choosing the nearest 1% resistor value gives R
B
= 11.0 k
W
.
Finally, R
A
is calculated:
R
R
R
R
R
k
k
k
k
A
T
OGM
B
A
=
-
-
=
W-
W-
W
=
W
1
1
1
1
1
1
1
7 57
.
200
1
11 3
25 86
.
.
(26)
Again, choosing the nearest 1% resistor value gives R
A
= 26.1 k
W
.
The compensating capacitor can be calculated from the equation:
￥
-
p
C
C
R
R
f
R
OC
OUT
E MAX
(
T
OSC
T
=
￥
￥
)
2
(27)
C
mF
7 57
2
m
k
kHz
k
nF
OC
=
￥
W
W
-
￥
￥
W=
19 8
1 5
.
400
7 57
.
3 5
.
.
.
p
The closest standard value for C
OC
is 3.3 nF.
The resistance of the zero-setting resistor in series with the
compensating capacitor is:
R
C
f
R
nF
kHz
Z
OC
OSC
2
p
Z
=
￥
￥
=
￥
￥
=
W
2
p
3 3
.
400
482
(28)
The nearest standard 5% resistor value is 470
W
. Note that this
resistor is only required when C
OUT
approaches C
CRIT
(within
25% or less). In this example, C
OUT
> C
CRIT
, and R
Z
can there-
fore be omitted.
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|---|---|
| ADP3160JR | 制造商:Rochester Electronics LLC 功能描述:5BIT PRGRM'BLE 2PHASE SYNCRO BUCK CNTRLR - Bulk |
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