参数资料
型号: ADP1873ARMZ-0.6-R7
厂商: Analog Devices Inc
文件页数: 20/40页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 10-MSOP
标准包装: 1
PWM 型: 电流模式
输出数: 1
频率 - 最大: 600kHz
占空比: 65%
电源电压: 2.75 V ~ 20 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 标准包装
产品目录页面: 792 (CN2011-ZH PDF)
其它名称: ADP1873ARMZ-0.6-R7DKR
ADP1872/ADP1873
Table 6. Valley Current Limit Program 1
Valley Current Level
Data Sheet
The valley current limit is programmed as outlined in Table 6
and Figure 70. The inductor chosen must be rated to handle the
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
peak current, which is equal to the valley current from Table 6
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
49A
MAXIMUM DC LOAD
CURRENT
? I = 45% 32.25A
5
5.5
10
15
31.0
23.3
15.5
23.4
21.25
11.7
7.75
11.7
10.6
5.83
3.87
INDUCTOR
CURRENT
? I = 33%
OF 30A
35A
30A
39.5A
OF 32.25A
? I = 65%
OF 37A
37A
COMP
OUTPUT
18
26.0
13.0
6.5
3.25
2.4V
1
Refer to Figure 70 for more information and a graphical representation.
VALLEY CURRENT LIMIT
THRESHOLD (SET FOR 25A)
39
37
35
33
31
29
27
25
RES = 47k ?
A CS = 3V/V
COMP
OUTPUT
SWING
23
21
19
17
15
13
11
9
7
RES = 100k ?
A CS = 24V/V
RES = NO RES
A CS = 12V/V
RES = 22k ?
A CS = 6V/V
0A 1V
Figure 71. Valley Current-Limit Threshold in Relation to Inductor Ripple Current
HICCUP MODE DURING SHORT CIRCUIT
A current-limit violation occurs when the current across the
source and drain of the lower side MOSFET exceeds the current-
5
3
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
limit setpoint. When 32 current-limit violations are detected,
the controller enters idle mode and turns off the MOSFETs for
R ON (m ? )
Figure 70. Valley Current-Limit Value vs. R ON of the Lower Side MOSFET
for Each Programming Resistor (RES)
6 ms, allowing the converter to cool down. Then, the controller
re-establishes soft start and begins to cause the output to ramp
up again (see Figure 72). While the output ramps up, COMP is
monitored to determine if the violation is still present. If it is still
present, the idle event occurs again, followed by the full-chip
power-down sequence. This cycle continues until the violation
no longer exists. If the violation disappears, the converter is
allowed to switch normally, maintaining regulation.
REPEATED CURRENT LIMIT
VIOLATION DETECTED
HS
CLIM
A PREDETERMINED NUMBER SOFT START IS
OF PULSES IS COUNTED TO REINITIALIZED TO
ALLOW THE CONVERTER MONITOR IF THE
TO COOL DOWN VIOLATION
STILL EXISTS
ZERO
CURRENT
Figure 72. Idle Mode Entry Sequence Due to Current-Limit Violations
Rev. B | Page 20 of 40
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