SSD1325 Solomon Systech, SSD1325 Datasheet - Page 18

• Manufacturer Part Number: SSD1325
• Description: OLED/PLED Driver
• Manufacturer: Solomon Systech

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DC-DC Voltage Converter
It is a switching voltage generator circuit, designed for handheld applications. In SSD1325, internal DC-
DC voltage converter accompanying with an external application circuit (shown in below figure) can
generate a high voltage supply V
OLED driver block. Below application circuit is an example for the input voltage of 3V VDD to generate
V
Remark:
Table 11 - Passive component selection:
Solomon Systech
CC
VDD
Components
L1
D1
Q1
R1, R2
R3
C1
C2
C3
C4
C5
C6
C7
1.
2.
3.
of 12V @20mA ~ 30mA application.
DGND
+
C1
L1, D1, Q1, C5 should be grouped closed together on PCB layout.
R1, R2, C1, C4 should be grouped closed together on PCB layout.
The VCC output voltage level can be adjusted by R1and R2, the reference formula is:
The value of (R1+R2) should be between 500k to 1M Ohm.
Typical Value
Inductor, 22µH
Schottky diode
MOSFET
Resistor
Resistor, 1.5
Capacitor, 1µF
Capacitor, 22µF
Capacitor, 1µF
Capacitor, 10nF
Capacitor, 1 ~ 10 µF
Capacitor, 0.1 ~ 1µF
Capacitor, 15nF
VCC = 1.2 x (R1+R2) / R2
AGND
+
+
C5
C6
AGND
VDDB
VBREF
VSSB
CC
from a low voltage supply input V
L1
RESE
GDR
FB
Remark
2A
2A, 25V e.g. 1N5822
N-FET with low R
e.g. MGSF1N02LT1 [ON SEMICONDUCTOR]
1%,1/10W
1%, 1/2W
16V
Low ESR, 25V
16V
16V
16V
16V
16V
Q1
Aug 2005
+
C4
DS
D1
(on) and low Vth voltage.
R3
R1
DD
P 18/53 Rev 1.2
. V
CC
R2
C7
+
is the voltage supply to the
+
C2
AGND
+
C3
VCC
SSD1325