9. REFERENCE: EXTERNAL CONNECTION EXAMPLES
S1F76540M0C Series Technical Manual
EPSON
27
(Rev.1.1)
Power-off method
Set the POFF1X pin to level LOW (VI); all circuits will be turned off.
Output voltage
When loading a diode 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 connection example shown in Figure 9.9, one diode is used; therefore, be sure to drop the
voltage by VF as shown in Figure 9.10. The boosting output voltage is indicated in the following expression.
When increasing
|
VO’
|
, use a diode with the lower VF value.
|
VO’
|
= 5×
|
VI
|
-VF
････････
Expression (9.2)
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 a diode.
In the example shown in Figure 9.9, “80mA
÷
5 = 16mA” 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 9.9, VI must satisfy input voltage conditions (see Table 7.1) at quintuple
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.
