參數(shù)資料
型號： ADP1650ACPZ-R7
廠商： ANALOG DEVICES INC
元件分類： 顯示驅(qū)動器
英文描述： LED DISPLAY DRIVER, PDSO10
封裝： 3 X 3 MM, 0.75 MM WIDTH, ROHS COMPLIANT, LFCSP-10
文件頁數(shù)： 20/32頁
文件大?。?/td> 1423K
代理商： ADP1650ACPZ-R7
ADP1650
Rev. C | Page 27 of 32
The worst-case capacitance accounting for capacitor variation
over temperature, component tolerance, and voltage is calcu-
lated using the following equation:
CEFF = COUT × (1 TEMPCO) × (1 TOL)
where:
CEFF is the effective capacitance at the operating voltage.
TEMPCO is the worst-case capacitor temperature coefficient.
TOL is the worst-case component tolerance.
In this example, the 10 μF X5R capacitor has the following
characteristics:
TEMPCO from 40°C to +85°C is 15%.
TOL is 10%.
COUT at VOUT (MAX) = 5 V, is 3 μF, as shown in Figure 44.
08
83
7-
0
2
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
6.30
5.04
3.78
2.52
DC BIAS VOLTAGE (V)
C
A
P
ACI
TANC
E
CH
ANG
E
(
%
)
1.26
0
Figure 44. DC Bias Characteristic of a 3 × 6.3 V, 10 μF Ceramic Capacitor
Substituting these values in the equation yields
CEFF = 3 μF × (1 0.15) × (1 0.1) = 2.29 μF
The effective capacitance needed for stability, which includes
temperature and dc bias effects, is 3.0 μF.
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