S1F75510 Epson Electronics America, Inc., S1F75510 Datasheet - Page 8

• Manufacturer Part Number: S1F75510
• Description: Charge-pump Dc/dc Converter & Voltage Regulator
• Manufacturer: Epson Electronics America, Inc.

S1F75510
8
FUNCTIONAL DESCRIPTION
Operational description
The S1F75510 is a power supply IC for TFT-LCD panel modules. With this IC chip alone, 3 positive and 3
negative levels of output voltages required for driving the LCD can be generated simultaneously by a single
power input.
The voltage converter circuit for the S1F75510 does not require an external transistor or diode since it is
equipped with a charge pump type DC/DC converter configured with a built-in CMOS transistor, enabling low
power consumption of the LCD module.
Generating voltage levels are:
· Positive boosting supply voltage necessary for the voltage stabilizing circuit (V
· Positive stabilized supply voltage necessary for the source driver (V
· Positive and negative boosting supply voltages necessary for the gate driver (V
The V
the positive direction). It makes 2 boosting in the positive direction of the potential difference occurring be-
tween the V
The V
ring between the V
The V
the positive direction). It makes 3 boosting in the positive direction of the potential difference occurring be-
tween the V
The V
the negative direction). It makes 3 boosting in the negative direction of the potential difference occurring
between the V
Indicated below is the system configuration diagram for the power circuit.
OUT1
OUT2
OUT3
OUT4
supply voltage is being generated by the charge pump type DC/DC converter ( 2 boosting circuit in
supply voltages is being generated by the series regulator stabilizing the potential difference occur-
supply voltage is being generated by the charge pump type DC/DC converter ( 3 boosting circuit in
supply voltage is being generated by the charge pump type DC/DC converter ( 3 boosting circuit in
DD
OUT2
OUT2
– V
– V
V
V
SS
OUT1
DD
SS
– V
SS
using the V
SS
using the V
– V
using the V
SS
V
using the V
Gate driver
S1F75510
OUT3,
SS
SS
potential as the reference voltage.
V
OUT4
OUT2
Fig. 2 System configuration diagram
potential as the reference voltage.
SS
potential as the reference voltage.
potential as the reference voltage.
V
OUT2
Source driver
OUT2
LCD panel
)
OUT1
OUT3
)
and V
OUT4
)
Rev. 1.1