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参数资料
型号： ADP1874-0.6-EVALZ
厂商： Analog Devices Inc
文件页数： 21/44页
文件大小： 0K
描述： BOARD EVAL FOR ADP1874
标准包装： 1
系列： *
Data Sheet
ADP1874/ADP1875
= I LOAD × ? ? 1 ?
I CLIM
K I ?
?
2 ?
Because the ADP1874/ADP1875arebasedonvalleycurrent
control, the relationship between I CLIM and I LOAD is
?
39
37
35
33
31
29
27
RES = 47k?
A CS = 3V/V
where:
K I is the ratio between the inductor ripple current and the
desired average load current (see Figure 70).
I CLIM is the desired valley current limit.
I LOAD is the current load.
25
23
21
19
17
15
13
11
9
RES = 100k?
RES = NO RES
A CS = 12V/V
RES = 22k?
A CS = 6V/V
Establishing K I helps to determine the inductor value (see the
Inductor Selection section), but in most cases K I = 0.33.
7
5
3
1
A CS = 24V/V
2 3 4 5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
R ON (m?)
LOAD CURRENT
RIPPLE CURRENT =
I LOAD
3
Figure 71. Valley Current-Limit Value vs. R ON 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
VALLEY CURRENT LIMIT
Figure 70. Valley Current Limit to Average Current Relation
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
When the desired valley current limit (I CLIM ) has been determined,
the current-sense gain can be calculated as follows:
(see Figure 72).
49A
I CLIM =
ΔI = 45% 32.25A
1 . 4 V
A CS × R ON
where:
R ON is the channel impedance of the lower side MOSFET.
A CS is the current-sense gain multiplier (see Table 6 and Table 7).
INDUCTOR
CURRENT
ΔI = 33%
OF 30A
35A
30A
MAXIMUM DC LOAD
CURRENT
39.5A
OF 32.25A
ΔI = 65%
OF 37A
37A
CS
AMPLIFIER
OUTPUT
Although the ADP1874 / ADP1875 have only four discrete current-
sense gain settings for a given R ON variable, Table 7 and Figure 71
outline several available options for the valley current setpoint
based on various R ON values.
Table 7. Valley Current Limit Program (See Figure 71)
Valley Current Level
VALLEY CURRENT-LIMIT
THRESHOLD (SET FOR 25A)
CS
AMPLIFIER
OUTPUT
SWING
2.4V
R ON
(mΩ)
1.5
2
47 kΩ
A CS = 3 V/V
22 kΩ
A CS = 6 V/V
Open
A CS = 12 V/V
100 kΩ
A CS = 24 V/V
38.9
29.2
0A
1V
Figure 72. Valley Current-Limit Threshold in Relation to Inductor Ripple Current
2.5
23.3
3
3.5
4.5
5
5.5
39.0
33.4
26.0
23.4
21.25
19.5
16.7
13
11.7
10.6
10
23.3
11.7
5.83
15
18
31.0
26.0
15.5
13.0
7.75
6.5
3.87
3.25
Rev. A | Page 21 of 44
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