S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 204

• Manufacturer Part Number: S1F78100Y2A
• Description: High Precision Voltage Regulators
• Manufacturer: Epson Electronics America, Inc.

S1F75300 Series
FUNCTIONAL DESCRIPTIONS
Switching Regulator Portion
Operation of Basic Boosting Circuit
S1F75300 boosts using clock pulses generated in the PWM control circuit. Figure 3 shows the block diagram for
explaining the principle of operation of the boosting circuit. This circuit stores energy in the inductance L when the
switching transistor (Tr1) is on and can charge the capacitor C with the stored energy by passing it through the diode
D for output when the switching transistor is off.
L
D
V
C
O1
V
DD
V
SW
Tr1
PWM
V
DD
control circuit
R
OSC
V
/V
SS
SS2
Figure 3 Block Diagram of Boosting Circuit
EPSON
5–4
S1F70000 Series
Technical Manual