Epson S1F76540M0C Series Technical Manual page 32

Power-off method
Set the POFF1X pin to level LOW (VI); all circuits will be turned off.
Output voltage
When loading diodes for boosting, the diode characteristics directly affect the boosting characteristics.
Especially using the VF pin (forward voltage lowering) in a diode causes the boosting output voltage to be
reduced. In the example shown in Figure 9.11, two diodes are used; therefore, be sure to drop the voltage by
2 × VF as shown in Figure 9.12. The boosting power voltage is indicated in the following expression.
When increasing | VO' | , use a diode with the lower VF value.
| VO' | = 6× | VI | -2×VF ････････ Expression (9.3)
Precautions
(1) Input and output current conditions
To keep the input and output current ratings, multiply the entire boosting magnification by the output
load current value so that it does not exceed the input current rating when performing high-magnification
boosting using diodes.
In the example shown in Figure 9.11, "80mA ÷ 6 = 13.3mA" is used as the maximum load current.
(2) Input and output voltage conditions
To keep the input and output voltage ratings, be aware of the potential relation when performing
high-magnification boosting using a diode.
In the circuit shown in Figure 9.11, VI must satisfy input voltage conditions (see Table 7.1) at sextuple
boosting.
Other setting conditions
(1) When using the high output mode
Connect the FC pin to VI.
(2) When changing the temperature coefficient CT
Change the TC1 and TC2 pins as shown in Table 5.3.
S1F76540M0C Series Technical Manual
(Rev.1.1)
9. REFERENCE: EXTERNAL CONNECTION EXAMPLES
EPSON 29