NL10276ac30_01a NEC, NL10276ac30_01a Datasheet - Page 6

• Manufacturer Part Number: NL10276ac30_01a
• Description: TFT COLOR LCD MODULE
• Manufacturer: NEC

POWER SUPPLY DESIGN
(1) Ripple voltage of the supply voltage
(2) Current wave in the luminance control mode
6
Please note that the ripple at the input connector of the module should be within the values shown in this table.
If the ripple would be beyond these values, the noise might appear on the screen.
Example of the power supply connection to minimize the ripple voltage
In the luminance control mode, the rush current below flows into the inverter of the module. The duty cycle
varies from 100% through 20% depending on the luminance control level. This might cause the noise on the
screen. Please evaluate the appropriate value of the capacitor in the filter to eliminate the noise.
Acceptable range
Note The acceptable range of ripple voltage includes spike noises.
a) Separate the power supply
Customer’s power
supply
GND
Power
Power
(12 V)
Rush
current
To V
DD
V
V
DD
DD
B
(for logic and LCD driver)
Filter
Duty
Data Sheet EN0417EJ1V0DS00
100 mVp-p
V
Frequency*
DD
b) Put the filter
Power
Inverter circuit of NL10276AC30-01A
Filter
Filter
*Frequency:
Vsync frequency
*Vsync
NL10276AC30-01A
(for backlight)
200 mVp-p
> 75 Hz: K = 3.6
V
75 Hz: K = 4.6
DD
V
V
B
DD
DD
B
K*