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ZL8101ALAF Datasheet(PDF) 14 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) 14 Page - Renesas Technology Corp

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ZL8101
FN7832 Rev 1.00
Page 14 of 36
July 13, 2012
3. Select the value of R1 from Table 3 using the Index1 rounded
value from Step 2.
4. Calculate Index0: Index0 = 100 x VOUT – (25 x Index1)
5. Select the value of R0 from Table 3 using the Index0 value
from Step 4.
Example from Figure 9: For VOUT = 1.33V,
Index1 = 4 x 1.33V = 5.32;
From Table 3, R1 = 16.2kΩ
Index0 = (100 x 1.33V) – (25 x 5) = 8;
From Table 3, R0 = 21.5kΩ
The output voltage can be determined from the R0 (Index0) and
R1 (Index1) values using Equation 1:
The output voltage may also be set to any value between 0.6V
and 3.6V using the I2C interface. See Application Note AN2033
for details.
Single Resistor Output Voltage Setting
Mode
Some applications desire the output voltage to be set using a
single resistor. This can be accomplished using a resistor on the
V1 pin while the V0 pin is tied to SGND. Table 4 lists the available
output voltage settings with a single resistor. See Application
Note AN2033 for more details.
TABLE 3. RESISTORS FOR SETTING OUTPUT VOLTAGE
INDEX
R0 OR R1
(kΩ)
010
111
2
12.1
3
13.3
4
14.7
516.2
617.8
7
19.6
821.5
9
23.7
10
26.1
11
28.7
12
31.6
13
34.8
14
38.3
15
42.2
16
46.4
17
51.1
18
56.2
19
61.9
20
68.1
21
75
22
82.5
23
90.9
24
100
100
)
1
Index
25
(
0
Index
OUT
V
(EQ. 1)
TABLE 4.
RV1(kΩ
RV0
VOUT
10
Low
0.60
11
Low
0.65
12.1
Low
0.70
13.3
Low
0.75
14.7
Low
0.80
16.2
Low
0.85
17.8
Low
0.90
19.6
Low
0.95
21.5
Low
1.00
23.7
Low
1.05
26.1
Low
1.10
28.7
Low
1.15
31.6
Low
1.20
34.8
Low
1.25
38.3
Low
1.30
42.2
Low
1.40
46.4
Low
1.50
51.1
Low
1.60
56.2
Low
1.70
61.9
Low
1.80
68.1
Low
1.90
75.0
Low
2.00
82.5
Low
2.10
90.9
Low
2.20
100
Low
2.30
FIGURE 9. OUTPUT VOLTAGE RESISTOR SETTING EXAMPLE
ZL8101
GH
GL
V0
V1
Vin
Vout
R0
21.5k
R1
16.2k



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