BD8150KVT ROHM Co. Ltd., BD8150KVT Datasheet - Page 12

• Manufacturer Part Number: BD8150KVT
• Description: System Power Supplies Power Suuply Ic Series For Tft-lcd Panels
• Manufacturer: ROHM Co. Ltd.

3 Regulator Block Design
4 Gamma correction voltage block design
4-2 Back plate bias common voltage setting
3-1 Basic operation
3-2 V
4-1 Gamma correction voltage setting resistance value selection
This IC incorporates a 1channel operation Buffer in addition to the 10channel Buffer Amp. This Op Amp, along with
discrete Transistor, can be used to set the back plate bias common voltage.
The voltage at the very top of the gamma correction voltage range is set using an internal low-saturation regulator. The
output voltage VREG (pin 30) is set using the resistance division R9 and R10.
Note that a 0.5V potential difference is required between REGV
The reference voltage BG accuracy is ±1%.
A capacitor for preventing oscillation is required at the V
high breakdown voltage.
A 10channel Buffer Amp is incorporated. The input voltage set by resistance division allows output of a gamma
correction voltage with greater current capacity. The configuration in the figure below can output gamma correction
voltage with high accuracy.
REG
VREG = BG × (R9 + R10) / R10 [V]
output capacitance selection
V
REG
BG
V
REG
IN+
IN-
-
+
IN9
IN0
IN1
IC
+
-
IC
1
1
1
COM
REGV
VREG
INV5
CC
Vo1
R10
R9
OUT0
OUT1
OUT9
Source driver
Gamma correction
V
REG
voltage input
12/16
Fig. 32 Gamma Correction Voltage Regulator Circuit Diagram
VCOM
REG
Fig. 33 Gamma Correction Voltage Generation Block Circuit Diagram
(Pin 30) output. Select one 1µF or larger with a sufficiently
Fig. 34 Common Voltage Setting Circuit Diagram
CC
and V
REG
for the regulator power supply.