XCL208/XCL209
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
PFM
V
OUT
Duty
V
IN
(V)
<C-1>
1.00
1.20
1.50
1.80
2.50
2.80
2.85
3.00
3.30
2.0V
2.20
2.50
2.80
3.50
3.80
3.85
4.00
4.30
MIN.
<E-1>
0.980
1.176
1.470
1.764
2.450
2.744
2.793
2.940
3.234
V
OUT
(V)
TYP.
<E-2>
1.000
1.200
1.500
1.800
2.500
2.800
2.850
3.000
3.300
MAX.
<E-3>
1.020
1.224
1.530
1.836
2.550
2.856
2.907
3.060
3.366
MIN.
<E-4>
190
190
180
170
170
170
170
170
170
I
PFM
(mA)
TYP.
<E-5>
260
260
240
220
220
220
220
220
220
MAX.
<E-6>
350
350
300
270
270
270
270
270
270
EFFI (%)
TYP.
<E-7>
79
82
84
85
86
86
86
86
86
MIN.
<E-8>
0.375
0.450
0.563
0.675
0.938
1.050
1.069
1.125
1.238
V
SHORT
(ms)
TYP.
<E-9>
0.500
0.600
0.750
0.900
1.250
1.400
1.425
1.500
1.650
MAX.
<E-10>
0.625
0.750
0.938
1.125
1.563
1.750
1.781
1.875
2.063
tss (ms)
TYP.
<E-11>
0.25
0.25
0.25
0.32
0.32
0.32
0.32
0.32
0.32
MAX.
<E-12>
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
<XCL208/XCL209 F type output voltage setting>
The output voltage can be set by adding external dividing resistors. The output voltage is determined by R1 and R2 in the
equation below. The sum of R1 and R2 is normally kept 1MΩ or less. The output voltage range can be set from 0.9V to 6.0V
based on the 0.8V ±2.0% reference voltage source.
Note that when the input voltage (V
IN
) is less than or equal to the set output voltage, an output voltage (V
OUT
) higher than the
input voltage (V
IN
) cannot be output.
V
OUT
=0.8×(R1+R2)/R2
Adjust the value of the phase compensation speedup capacitor C
FB
so that fzfb=1/(2×π×C
FB
×R1) is 10kHz or less. It is
optimum to adjust to a value from 1kHz to 20kH based on the components used and the board layout.
[Calculation example]
When R1=470kΩ, R2=150kΩ, V
OUT
=0.8×(470k+150k)/150k=3.3V
e.g.
V
OUT
(V)
0.9
1.2
1.5
1.8
2.5
3.0
3.3
4.0
R1 (kΩ)
100
150
130
300
510
330
470
120
R2 (kΩ)
820
300
150
240
240
120
150
30
C
FB
(pF)
150
100
220
150
100
150
100
470
Circuit (XCL208F/XCL209F Type)
8/22
TOREX [ TOREX SEMICONDUCTOR ]
