S1F76540MOC Epson Electronics America, Inc., S1F76540MOC Datasheet - Page 34

• Manufacturer Part Number: S1F76540MOC
• Description: Charge Pump Type Dc/dc Converter
• Manufacturer: Epson Electronics America, Inc.

S1F76540M0C Series Technical Manual (Rev.1.0)
(positive pole) side to V
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 Fig.9.11, three diodes are used; therefore, be
sure to drop the voltage by 3 × VF as shown in Fig.9.12. The boosting power voltage is indicated in the
following expression.
Power-off method
For double boosting:
Output voltage
Precautions
Other setting conditions
Set the POFF2X pin to level LOW (VI); all circuits will be turned off.
When performing double boosting, delete C2 and D1 shown in Fig.9.13, and connect the D2 anode
In the positive voltage conversion, the diode characteristics directly affect the boosting
| VO’ | When increasing | VO’ | , use a diode with the lower VF value.
rating.
(See Table 7.1.)
Input and output current conditions
To keep the input and output current ratings, take care so that the input current does not exceed the
Input voltage conditions
For positive voltage conversion, the input voltage rating is equal to for the negative double-boosting.
When using the high output mode
Connect the FC pin to VI.
| VO’ | = 3× | VI | -3×VF ････････ Expression (9.4)
DD
.
9. REFERENCE: EXTERNAL CONNECTION EXAMPLES
EPSON
31