XCL208/XCL209 Series
■ELECTRICAL CHARACTERISTICS (Continued)
PFM
VOUT (V)
IPFM (mA)
EFFI (%)
VSHORT (ms)
tss (ms)
TYP. MAX.
Duty
VOUT
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
TYP.
MIN.
TYP. MAX.
VIN (V)
<C-1> <E-1> <E-2> <E-3> <E-4> <E-5> <E-6>
<E-7>
79
<E-8> <E-9> <E-10> <E-11> <E-12>
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
0.980 1.000 1.020
1.176 1.200 1.224
1.470 1.500 1.530
1.764 1.800 1.836
2.450 2.500 2.550
2.744 2.800 2.856
2.793 2.850 2.907
2.940 3.000 3.060
3.234 3.300 3.366
190
190
180
170
170
170
170
170
170
260
260
240
220
220
220
220
220
220
350
350
300
270
270
270
270
270
270
0.375 0.500
0.450 0.600
0.563 0.750
0.675 0.900
0.938 1.250
1.050 1.400
1.069 1.425
1.125 1.500
1.238 1.650
0.625
0.750
0.938
1.125
1.563
1.750
1.781
1.875
2.063
0.25
0.25
0.25
0.32
0.32
0.32
0.32
0.32
0.32
0.40
0.40
0.40
0.50
0.50
0.50
0.50
0.50
0.50
82
84
85
86
86
86
86
86
<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 (VIN) is less than or equal to the set output voltage, an output voltage (VOUT) higher than the
input voltage (VIN) cannot be output.
VOUT=0.8×(R1+R2)/R2
Adjust the value of the phase compensation speedup capacitor CFB so that fzfb=1/(2×π×CFB×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, VOUT=0.8×(470k+150k)/150k=3.3V
e.g.
VOUT (V)
Circuit (XCL208F/XCL209F Type)
R1 (kΩ)
100
R2 (kΩ)
820
300
150
240
240
120
150
30
CFB (pF)
150
0.9
1.2
1.5
1.8
2.5
3.0
3.3
4.0
150
100
130
220
300
150
510
100
330
150
470
100
120
470
8/22
TOREX [ Torex Semiconductor ]
