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Epson Research and Development Page 9
Vancouver Design Center
Connecting to the Sharp HR-TFT Panels S1D13708
Issue Date: 01/11/25 X39A-G-011-01
2.1.2 Digital/Analog Power Supplies
The digital power supply (VSHD) must be connected to a 3.3V supply. The analog power
supply (VSHA) must be connected to a 5.0V supply.
2.1.3 DC Gate Driver Power Supplies
The gate driver high level power supply (V
DD
) and the gate driver logic low power supply
(V
SS
) have typical values of +15V and -15V respectively. These power supplies can be
provided by a Linear Technology high efficiency switching regulator (LT1172). The two
power supplies can be adjusted through their allowable ranges using the potentiometer
VR1.
The gate driver logic high power supply (V
CC
) is defined as V
SS
+ VSHD. The typical V
CC
voltage of -11.7V can be supplied from V
SS
using a 3.3V zener diode which provides the
necessary voltage change.
Figure 2-2: “Panel Gate Driver DC Power Supplies” shows the schematic for V
SS
, V
DD
and
V
CC
.
Figure 2-2: Panel Gate Driver DC Power Supplies
VSS
VSS
VSS
VCC
VDD
+5V
+
C1
10uF 25V
+
C3
22uF 16V
D2
SCHOTTKY
21
L1
100uH 300mA
D3
SCHOTTKY
21
R2
1K 5%
VR1
20K
1 3
2
R1
1K 5%
D4
3.3V Zener
2 1
R3
22K 5%
+
C4
10uF 16V
D1
SCHOTTKY 1A Vf=0.5V
2 1
C2
1uF
U1
LT1172
6
8
1
7
3
4
5
2
E1
E2
Gnd
Vswitch
Vfb
N/C
Vin
Vcomp