参数资料
型号: ADP1879-1.0-EVALZ
厂商: Analog Devices Inc
文件页数: 20/40页
文件大小: 0K
描述: BOARD EVAL FOR ADP1879-1.0
标准包装: 1
系列: *
ADP1878/ADP1879
When the desired valley current limit (I CLIM ) has been determined,
the current sense gain can be calculated as follows:
1.4  V
where:
R ON is the channel impedance of the low-side MOSFET.
A CS is the current sense gain multiplier (see Table 6 and Table 7).
Although the ADP1878 / ADP1879 have only four discrete current
sense gain settings for a given R ON variable, Table 7 and Figure 71
Data Sheet
The valley current limit is programmed as listed in Table 7 and
shown in Figure 71. The inductor that is 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).
49A
MAXIMUM DC LOAD
CURRENT
outline several available options for the valley current setpoint
based on various R ON values.
INDUCTOR
CURRENT
35A
39.5A
? I = 65%
OF 37A
37A
CURRENT
SENSE
AMPLIFIER
OUTPUT
Valley Current Level (A)
? I = 45% 32.25A
Table 7. Valley Current Limit Program (See Figure 71)
? I = 33%
OF 30A
30A
OF 32.25A
R ON
(mΩ)
1.5
2
2.5
3
3.5
4.5
47 kΩ,
A CS = 3 V/V
22 kΩ, Open,
A CS = 6 V/V A CS = 12 V/V
39.0
33.4
26.0
100 kΩ,
A CS = 24 V/V
38.9
29.2
23.3
19.5
16.7
13
VALLEY CURRENT-LIMIT
THRESHOLD (SET FOR 25A)
CS AMP
OUTPUT
SWING
2.4V
5
5.5
10
23.3
23.4
21.25
11.7
11.7
10.6
5.83
0A 1V
Figure 72. Valley Current-Limit Threshold in Relation to Inductor Ripple Current
15
18
31.0
26.0
15.5
13.0
7.75
6.5
3.87
3.25
1
Blank cells are not applicable.
39
37
35
33
31
29
27
25
23
21
RES = 47k ?
A CS = 3V/V
19
17
15
13
11
9
7
5
RES = 100k ?
A CS = 24V/V
RES = NO RES
A CS = 12V/V
RES = 22k ?
A CS = 6V/V
3
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
R ON (m ? )
Figure 71. Valley Current-Limit Value vs. R ON of the Low-Side MOSFET
for Each Programming Resistor (RES)
Rev. B | Page 20 of 40
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