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ADP1650ACBZ-R7 数据表(PDF) 27 Page - Analog Devices

部件名 ADP1650ACBZ-R7
功能描述  1.5 A LED Flash Driver with I2C-Compatible Interface
PDF  32 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP1650ACBZ-R7 数据表(HTML) 27 Page - Analog Devices

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ADP1650
Rev. 0 | 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 10μF X5R capacitor has the following:
TEMPCO from −40°C to +85°C is 15%.
TOL is 10%.
COUT at VOUT (MAX) = 5 V, is 7 μF, as shown inFigure 43.
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
6.30
5.04
3.78
2.52
DC BIAS VOLTAGE (V)
1.26
0
Figure 42. DC Bias Characteristic of a 3 × 6.3 V, 10 μF Ceramic Capacitor
Substituting these values in the equation yields
CEFF =7 μF × (1 − 0.15) × (1 − 0.1) = 5.35 μF
The effective capacitance needed for stability, which includes
temperature and dc bias effects, is 3.0 μF.



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