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ZL8101ALAF Datasheet(PDF) 21 Page - Renesas Technology Corp

Part # ZL8101ALAF
Description  Adaptive Digital DC/DC PWM Controller with Auto Compensation
PDF  36 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ZL8101ALAF Datasheet(HTML) 21 Page - Renesas Technology Corp

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ZL8101
FN7832 Rev 1.00
Page 21 of 36
July 13, 2012
resistance (DCR) sensing; Figure 12 shows a simplified
schematic for DCR method. rDS(ON) method is not supported.
Advanced ILIM pinstrapping options are not available for the
ZL8101. However, all current limit and fault response options are
available when using I2C/SMBus interface and configuration file.
The blanking time represents the time when no current
measurement is taken. This is to avoid taking a reading just after
a coincident switching edge (less accurate due to potential
ringing). Blanking time is a configurable parameter.
ZL8101 provides an adjustable maximum full scale sensing
range. The available ranges are 25mV, 35mV and 50mV using
the I2C/SMBus interface or a configuration file. Table 11 lists the
factory default value for the current limit function.
The user must select the voltage threshold (VLIM), the desired
current limit threshold, and the resistance of the sensing
element.
The current limit threshold must be set to a custom value via the
I2C/SMBus interface. Please refer to Application Note AN2033
for further details.
Loop Compensation
The ZL8101 has an auto compensation feature that measures
the characteristics of the power train and calculates the proper
tap coefficients. Auto compensation is configured using the FC
pin as shown in Table 12.
TABLE 11. FACTORY DEFAULT ILIM CONFIGURATION
CURRENT LIMITING
CONFIGURATION
NUMBER OF
VIOLATIONS
ALLOWED
CURRENT LIMIT
THRESHOLD VLIM
(mV)
MAXIMUM
CURRENT
SENSING RANGE
(mV)
Output-referenced,
down-slope sensing
(Inductor DCR sensing)
Blanking time: 480ns
750
50
TABLE 12. PIN #9 (FC) AUTO COMPENSATION MODE
RFC
(kΩ)STORE VALUES
SINGLE/
REPEAT
PG
ASSERT
AUTO COMP
GAIN
LOW
Auto Comp Disabled
OPEN
Not Stored
Single
After Auto
Comp
100%
HIGH
Store in Flash
Single
After Auto
Comp
10
Not Stored
Single
After Auto
Comp
100%
11
Store in Flash
12.1
Not Stored
Repeat
1s
13.3
Store in Flash
14.7
Not Stored
Single
After PG
Delay
16.2
Store in Flash
17.8
Not Stored
Repeat
1s
19.6
Store in Flash
OPEN
Not Stored
Single
After Auto
Comp
HIGH/
21.5
Store in Flash
23.7
Not Stored
Repeat
1min
26.1
Store in Flash
28.7
Not Stored
Single
After PG
Delay
31.6
Store in Flash
34.8
Not Stored
Repeat
1min
38.3
Store in Flash
42.2
Not Stored
Single
After Auto
Comp
50%
46.4
Store in Flash
51.1
Not Stored
Repeat
1s
56.2
Store in Flash
61.9
Not Stored
Single
After PG
Delay
68.1
Store in Flash
75
Not Stored
Repeat
1s
82.5
Store in Flash
90.9
Not Stored
Single
After Auto
Comp
100
Store in Flash
110
Not Stored
Repeat
1min
121
Store in Flash
133
Not Stored
Single
After PG
Delay
147
Store in Flash
162
Not Stored
Repeat
1min
178
Store in Flash
TABLE 12. PIN #9 (FC) AUTO COMPENSATION MODE (Continued)
RFC
(kΩ)STORE VALUES
SINGLE/
REPEAT
PG
ASSERT
AUTO COMP
GAIN



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