參數(shù)資料
型號： ADP1875ARQZ-0.3-R7
廠商： ANALOG DEVICES INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16
封裝： ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁數(shù)： 14/44頁
文件大小： 2475K
代理商： ADP1875ARQZ-0.3-R7
ADP1874/ADP1875
Rev. 0 | Page 21 of 44
12345 6789 10 11 12 13 14 15 16 17 18 19 20
V
AL
L
E
Y
CUR
RE
NT
L
IM
IT
(
A
)
RON (m)
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
RES = 47k
ACS = 3V/V
RES = 22k
ACS = 6V/V
RES = NO RES
ACS = 12V/V
RES = 100k
ACS = 24V/V
09
34
7-
06
9
Because the ADP1874/ADP1875 are based on valley current
control, the relationship between ICLIM and ILOAD is
×
=
2
1
I
LOAD
CLIM
K
I
where:
KI
is the ratio between the inductor ripple current and the
desired average load current (see Figure 70).
ICLIM
is the desired valley current limit.
ILOAD
is the current load.
Establishing KI helps to determine the inductor value (see the
Inductor Selection section), but in most cases KI = 0.33.
LOAD CURRENT
VALLEY CURRENT LIMIT
RIPPLE CURRENT =
ILOAD
3
09
34
7-
0
68
Figure 71. Valley Current-Limit Value vs. RON of the Lower-Side MOSFET
for Each Programming Resistor (RES)
The valley current limit is programmed as outlined in Table 7
and Figure 71. The inductor chosen must be rated to handle the
peak current, which is equal to the valley current from Table 7
plus the peak-to-peak inductor ripple current (see the Inductor
Selection section). In addition, the peak current value must be
used to compute the worst-case power dissipation in the MOSFETs
(see Figure 72).
Figure 70. Valley Current Limit to Average Current Relation
When the desired valley current limit (ICLIM) has been determined,
the current-sense gain can be calculated as follows:
INDUCTOR
CURRENT
VALLEY CURRENT-LIMIT
THRESHOLD (SET FOR 25A)
I = 33%
OF 30A
CS
AMPLIFIER
OUTPUT
SWING
CS
AMPLIFIER
OUTPUT
2.4V
1V
0A
35A
30A
32.25A
37A
49A
39.5A
I = 45%
OF 32.25A
I = 65%
OF 37A
MAXIMUM DC LOAD
CURRENT
09
34
7-
07
0
ON
CS
CLIM
R
A
I
×
=
V
4
.
1
where:
RON is the channel impedance of the lower-side MOSFET.
ACS is the current-sense gain multiplier (see Table 6 and Table 7).
Although the ADP1874/ADP1875 have only four discrete current-
sense gain settings for a given RON variable, Table 7 and Figure 71
outline several available options for the valley current setpoint
based on various RON values.
Table 7. Valley Current Limit Program (See Figure 71)
Valley Current Level
47 kΩ
22 kΩ
Open
100 kΩ
RON
(mΩ)
ACS = 3 V/V
ACS = 6 V/V
ACS = 12 V/V
ACS = 24 V/V
1.5
38.9
2
29.2
2.5
23.3
3
39.0
19.5
3.5
33.4
16.7
4.5
26.0
13
5
23.4
11.7
5.5
21.25
10.6
10
23.3
11.7
5.83
15
31.0
15.5
7.75
7.5
18
26.0
13.0
6.5
3.25
Figure 72. Valley Current-Limit Threshold in Relation to Inductor Ripple Current
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