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参数资料
| 型号： | ZL6100EVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 21/34页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD USB ZL6100 |
| 标准包装： | 1 |
| 系列： | * |
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ZL6100
TABLE 16. RESISTOR CONFIGURED CURRENT SENSING
METHOD SELECTION
NUMBER OF
VIOLATIONS
TABLE 17. CURRENT LIMIT THRESHOLD VOLTAGE
PIN-STRAP SETTINGS
ILIM0
R ILIMI1
(k Ω )
CURRENT SENSING
METHOD
ALLOWED
(Note 25)
LOW
(mV)
OPEN
(mV)
HIGH
(mV)
10
1
LOW
20
30
40
11
12.1
3
5
ILIM1
OPEN
HIGH
50
80
60
90
70
100
13.3
14.7
16.2
17.8
19.6
21.5
23.7
26.1
28.7
31.6
34.8
Ground-referenced, r DS(ON) , sensing
Best for low duty cycle and low f SW
Blanking time: 672ns
Output-referenced, down-slope
sensing (Inductor DCR sensing) Best
for low duty cycle and high f SW
Blanking time: 352ns
7
9
11
13
15
1
3
5
7
9
11
The threshold voltage can also be selected in 5mV
increments by connecting a resistor, R LIM0 , between the
ILIM0 pin and ground according to Table 18. This method is
preferred if the user does not desire to use or does not have
access to the I 2 C/SMBus interface and the desired threshold
value is contained in Table 18.
The current limit threshold can also be set to a custom value
via the I 2 C/SMBus interface. Please refer to Application Note
AN2033 for further details.
TABLE 18. CURRENT LIMIT THRESHOLD VOLTAGE
RESISTOR SETTINGS
R ILIM0 V LIM for RDS V LIM for DCR
(k Ω ) (mV) (mV)
38.3
42.2
46.4
51.1
56.2
13
15
1
3
5
10
11
12.1
13.3
14.7
0
5
10
15
20
0
2.5
5
7.5
10
61.9
68.1
75
82.5
90.9
Output-referenced, up-slope sensing
(Inductor DCR sensing)
Best for high duty cycle Blanking
time: 352ns
7
9
11
13
15
16.2
17.8
19.6
21.5
23.7
25
30
35
40
45
12.5
15
17.5
20
22.5
NOTE:
25. The number of violations allowed prior to issuing a fault response
The blanking time represents the time when no current
measurement is taken. This is to avoid taking a reading just
after a current load step (less accurate due to potential
ringing). It is a configurable parameter.
Table 15 includes default parameters for the number of
violations and the blanking time using pin-strap.
Once the sensing method has been selected, the user must
select the voltage threshold (V LIM ), the desired current limit
threshold, and the resistance of the sensing element.
The current limit threshold can be selected by simply
26.1
28.7
31.6
34.8
38.3
46.4
51.1
56.2
68.1
82.5
100
50
55
60
65
70
80
85
90
100
110
120
25
27.5
30
32.5
35
40
42.5
45
50
55
60
connecting the ILIM0 and ILIM1 pins as shown in Table 17. The
ground-referenced sensing method is being used in this mode.
21
FN6876.3
August 29, 2012
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