TS1910A Datasheet, PDF (5/8 Pages) Taiwan Semiconductor Company, Ltd – 680kHz/1.2MHz High Voltage Boost Converter

TS1910A
680kHz/1.2MHz High Voltage Boost Converter
Compensation Table
Frequency(Hz)
680K
(FREQ=Low)
1.2M
(FREQ=High)
L1 (H)
6.8u
4.7u
VIN (V)
2.5~4.4
2.5~5.5
2.5~5.5
2.5~5.5
2.5~5.5
2.5~5.5
2.5~5.5
2.5~5.5
2.5~4.0
2.5~5.5
2.5~5.5
2.5~5.5
2.5~5.5
2.5~5.5
2.5~5.5
2.5~5.5
VOUT (V)
5
7
9
12
15
18
21
24
5
7
9
12
15
18
21
24
R6 (Ω)
10K
15K
27K
56K
150K
110K
150K
100K
33K
39K
39K
100K
130K
150K
220K
390K
C7 (F)
1.2n
470p
270p
150p
120p
100p
82p
47p
1n
390p
220p
100p
68p
56p
47p
39p
Application Information
Setting the Output Voltage
Application circuit item shows the basic application circuit with TS1910A adjustable output version. The external
resistor sets the output voltage according to the following equation:
V_OUT=1.238V x (1+R2/R8)
For most applications, R8 is a suggested a value by 10~30KΩ. Place the resistor-divider as close to the IC as
possible to reduce the noise sensitivity.
Soft Start Capacitor
The soft-start function begins from SS pin Voltage=0V to V_CC with a 7uA (typ.) constant current charging to the soft-
start capacitor, so the capacitor should be large enough to let the output voltage reach regulation inside the soft-start
cycle. Typical value of soft-start capacitor range is from 4.7nF to 100nF. After the cycle finished, the load can start to
draw maximum current as required.
Frequency Select Pin (FREQ)
The frequency select pin FREQ allows to set the switching frequency of the device to 680 KHz (FREQ = low) or 1.2
MHz (FREQ = high). Higher switching frequency improves load transient response but reduces slightly the
efficiency. The other benefits of higher switching frequency are a lower output ripple voltage. Usually, it is
recommended to use 1.2 MHz switching frequency unless light load efficiency is a major concern.
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Version: A12