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ADP1611ARMZ-R7 데이터시트(PDF) 13 Page - Analog Devices

부품명 ADP1611ARMZ-R7
상세설명  20 V,1.2 MHz Step-Up DC-to-DC Switching Converter
PDF  20 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
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ADP1611ARMZ-R7 데이터시트(HTML) 13 Page - Analog Devices

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ADP1611
Rev. 0 | Page 13 of 20
For low ESR output capacitance, such as with a ceramic capaci-
tor, C2 is optional. For optimal transient performance, the
RCOMP and CCOMP might need to be adjusted by observing the
load transient response of the ADP1611. For most applications,
the compensation resistor should be in the range of 30 kΩ to
400 kΩ, and the compensation capacitor should be in the range
of 100 pF to 1.2 nF. Table 7 shows external component values
for several applications.
REF
COMP
FB
C2
CC
RC
ERROR AMP
1
2
gm
Figure 26. Compensation Components
SOFT-START CAPACITOR
The voltage at SS ramps up slowly by charging the soft-start
capacitor (CSS) with an internal 3 µA current source. Table 8
lists the values for the soft-start period, based on maximum
output current and maximum switching frequency.
The soft-start capacitor limits the rate of voltage rise on the
COMP pin, which in turn limits the peak switch current at
startup. Table 8 shows a typical soft-start period, tSS, at
maximum output current, IOUT_MAX, for several conditions.
A 20 nF soft-start capacitor results in negligible input current
overshoot at startup, and so is suitable for most applications.
However, if an unusually large output capacitor is used, a longer
soft-start period is required to prevent input inrush current.
Conversely, if fast startup is a requirement, the soft-start
capacitor can be reduced or even removed, allowing the
ADP1611 to start quickly, but allowing greater peak switch
current (see Figure 24 and Figure 25).
Table 7. Recommended External Components for Popular Input/Output Voltage Conditions
VIN (V)
VOUT (V)
fSW (MHz)
L (µH)
COUT (µF)
CIN (µF)
R1 (kΩ)
R2 (kΩ)
RCOMP (kΩ)
CCOMP (pF)
IOUT_MAX (mA)
3.3
5
0.70
4.7
10
10
30.9
10
50
520
600
5
1.23
2.7
10
10
30.9
10
90.9
150
600
9
0.70
10
10
10
63.4
10
71.5
820
350
9
1.23
4.7
10
10
63.4
10
150
180
350
12
0.70
10
10
10
88.7
10
130
420
250
12
1.23
4.7
10
10
88.7
10
280
100
250
5
9
0.70
10
10
10
63.4
10
84.5
390
450
9
1.23
4.7
10
10
63.4
10
178
100
450
12
0.70
10
10
10
88.7
10
140
220
350
12
1.23
4.7
10
10
88.7
10
300
100
350
20
0.70
10
10
10
154
10
400
100
250
20
1.23
6.8
10
10
154
10
400
100
250
Table 8. Typical Soft Start Period
VIN (V)
VOUT (V)
COUT (µF)
CSS (nF)
tSS (ms)
VIN (V)
VOUT (V)
COUT (µF)
CSS (nF)
tSS (ms)
3.3
5
10
20
0.3
5
9
10
20
0.4
5
10
100
2
9
10
100
1.5
9
10
20
2.5
12
10
20
0.62
9
10
100
8.2
12
10
100
2
12
10
20
3.5
20
10
20
1.1
12
10
100
15
20
10
100
4.1



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