参数资料
型号: ZL2008ALAFT
厂商: Intersil
文件页数: 13/42页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 36-QFN
标准包装: 100
PWM 型: 电压模式
输出数: 1
频率 - 最大: 1.4MHz
占空比: 95%
电源电压: 3 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-VFQFN 裸露焊盘
包装: 带卷 (TR)
ZL2008
Output Voltage Selection
TABLE 3. Output Voltage Resistors Settings
STANDARD MODE
The output voltage may be set to any voltage between 0.6V and
5.0V provided that the input voltage is higher than the desired
output voltage by an amount sufficient to prevent the device
from exceeding its maximum duty cycle specification. Using the
pin-strap method, V OUT can be set to any of nine standard
voltages as shown in Table 2.
TABLE 2. Output Voltage Pin-strap Settings
V0
Index
0
1
2
3
4
5
R0 or R1
(k Ω )
10
11
12.1
13.3
14.7
16.2
LOW
(V)
OPEN
(V)
HIGH
(V)
6
7
17.8
19.6
LOW
0.6
0.8
1.0
8
21.5
V1
OPEN
HIGH
1.2
2.5
1.5
3.3
1.8
5.0
9
10
23.7
26.1
The resistor setting method can be used to set the output voltage
to levels not available in Table 2. Resistors R0 and R1 are
selected to produce a specific voltage between 0.6V and 5.0V in
10mV steps. Resistor R1 provides a coarse setting and resistor
R0 provides a fine adjustment, thus eliminating the additional
errors associated with using two 1% resistors (this typically adds
approx 1.4% error).
To set V OUT using resistors, follow the steps below to calculate an
index value and then use Table 3 to select the resistor that
corresponds to the calculated index value as follows:
1. Calculate Index1:
Index1 = 4 x V OUT (V OUT in 10mV steps)
2. Round the result down to the nearest whole number.
3. Select the value of R1 from Table 3 using the Index1 rounded
value from step 2.
4. Calculate Index0:
5. Index0 = 100 x V OUT – (25 x Index1)
6. Select the value of R0 from Table 3 using the Index0 value
from Step 4.
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Example from Figure 9: For V OUT = 1.33V,
28.7
31.6
34.8
38.3
42.2
46.4
51.1
56.2
61.9
68.1
75
82.5
90.9
100
Index1 = 4 x 1.33V = 5.32;
From Table 3, R1 = 16.2k Ω
Index0 = (100 x 1.33V) – (25 x 5) = 8;
From Table 3, R0 = 21.5k Ω
SMBUS MODE
The output voltage may be set to any value between 0.6V and
5.0V using a PMBus command over the I 2 C/SMBus interface.
See Application Note AN2033 for details.
13
FN6859.4
April 29, 2011
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