zl2006 Intersil Corporation, zl2006 Datasheet - Page 26

• Manufacturer Part Number: zl2006
• Description: Adaptive Digital Dc-dc Controller With Drivers And Current Sharing
• Manufacturer: Intersil Corporation

Table 20. Resistor Configured Current Sensing
Method Selection
Notes:
1. The number of violations allowed prior to issuing a fault response
12.1 kΩ
13.3 kΩ
14.7 kΩ
16.2 kΩ
17.8 kΩ
19.6 kΩ
21.5 kΩ
23.7 kΩ
26.1 kΩ
28.7 kΩ
31.6 kΩ
34.8 kΩ
38.3 kΩ
42.2 kΩ
46.4 kΩ
51.1 kΩ
56.2 kΩ
61.9 kΩ
68.1 kΩ
82.5 kΩ
90.9 kΩ
10 kΩ
11 kΩ
75 kΩ
R
ILIMI1
Ground-referenced,
down-slope sensing
Output-referenced,
Output-referenced,
cycle and high f
Current Sensing
Best for high duty
cycle and low f
up-slope sensing
Best for low duty
Best for low duty
R
(Inductor DCR
(Inductor DCR
Blanking time:
Blanking time:
Blanking time:
DS(ON)
sensing)
sensing)
Method
672 ns
352 ns
352 ns
cycle
26
, sensing
SW
SW
Number of
Violations
Allowed
11
13
15
11
13
15
11
13
15
1
3
5
7
9
1
3
5
7
9
1
3
5
7
9
1
ZL2006
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 19 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 21. The ground-referenced sensing method is
being used in this mode.
Table 21. Current Limit Threshold Voltage Pin-strap
The threshold voltage can also be selected in 5 mV
increments by connecting a resistor, R
ILIM0 pin and ground according to Table 22. This
method is preferred if the user does not desire to use or
does not have access to the I
the desired threshold value is contained in Table 22.
The current limit threshold can also be set to a custom
value via the I
Application Note AN33 for further details.
ILIM1
Settings
OPEN
HIGH
LOW
2
C/SMBus interface. Please refer to
20 mV
50 mV
80 mV
LOW
2
C/SMBus interface and
ILIM0
December 15, 2010
30 mV
60 mV
90 mV
OPEN
LIM0
, between the
FN6850.1
100 mV
40 mV
70 mV
HIGH