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ZL6100ALAF 数据表(PDF) 21 Page - Renesas Technology Corp

部件名 ZL6100ALAF
功能描述  Adaptive Digital DC/DC Controller with Drivers and Current Sharing
PDF  34 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

ZL6100ALAF 数据表(HTML) 21 Page - Renesas Technology Corp

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ZL6100
FN6876 Rev 3.00
Page 21 of 34
August 29, 2012
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 (VLIM), the desired current limit
threshold, and the resistance of the sensing element.
The current limit threshold can be selected by simply connecting
the ILIM0 and ILIM1 pins as shown in Table 17. The ground-
referenced sensing method is being used in this mode.
The threshold voltage can also be selected in 5mV increments
by connecting a resistor, RLIM0, 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
I2C/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 I2C/SMBus interface. Please refer to Application Note
AN2033 for further details.
TABLE 16. RESISTOR CONFIGURED CURRENT SENSING
METHOD SELECTION
RILIMI1
(k
)
CURRENT SENSING
METHOD
NUMBER OF
VIOLATIONS
ALLOWED
(Note 25)
10
Ground-referenced, rDS(ON), sensing
Best for low duty cycle and low fSW
Blanking time: 672ns
1
11
3
12.1
5
13.3
7
14.7
9
16.2
11
17.8
13
19.6
15
21.5
Output-referenced, down-slope
sensing (Inductor DCR sensing) Best
for low duty cycle and high fSW
Blanking time: 352ns
1
23.7
3
26.1
5
28.7
7
31.6
9
34.8
11
38.3
13
42.2
15
46.4
Output-referenced, up-slope sensing
(Inductor DCR sensing)
Best for high duty cycle Blanking
time: 352ns
1
51.1
3
56.2
5
61.9
7
68.1
9
75
11
82.5
13
90.9
15
NOTE:
25. The number of violations allowed prior to issuing a fault response
TABLE 17. CURRENT LIMIT THRESHOLD VOLTAGE PIN-STRAP
SETTINGS
ILIM0
LOW
(mV)
OPEN
(mV)
HIGH
(mV)
LOW
20
30
40
ILIM1
OPEN
50
60
70
HIGH
80
90
100
TABLE 18. CURRENT LIMIT THRESHOLD VOLTAGE RESISTOR
SETTINGS
RILIM0
(k
)
VLIM for RDS
(mV)
VLIM for DCR
(mV)
10
0
0
11
5
2.5
12.1
10
5
13.3
15
7.5
14.7
20
10
16.2
25
12.5
17.8
30
15
19.6
35
17.5
21.5
40
20
23.7
45
22.5
26.1
50
25
28.7
55
27.5
31.6
60
30
34.8
65
32.5
38.3
70
35
46.4
80
40
51.1
85
42.5
56.2
90
45
68.1
100
50
82.5
110
55
100
120
60



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