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| 型号： | HCMS-2919 |
| 元件分类： | 显示用LED |
| 英文描述： | 5X7 DOT MATRIX DISPLAY, BLUE, 3.71 mm |
| 文件页数： | 4/14页 |
| 文件大小： | 139K |
| 代理商： | HCMS-2919 |
12
Appendix A. Thermal Considerations
The display IC has a maximum junction temperature
of 150°C. The IC junction temperature can be calculated
with Equation 1 below.
A typical value for R
θJA is 100°C/W. This value is typical
for a display mounted in a socket and covered with a
plastic filter. The socket is soldered to a .062 in. thick
PCB with .020 inch wide, one ounce copper traces. PD
can be calculated as Equation 2 below.
Figure 7 shows how to derate the power of one IC
versus ambient temperature. Operation at high
ambient temperatures may require the power per IC
to be reduced. The power consumption can be reduced
by changing either the N, IPIXEL, Osc cyc or VLED.
Changing VLOGIC has very little impact on the power
consumption.
Figure 7. Maximum power dissipation per IC versus ambient
temperature.
Appendix B. Electrical Considerations
Current Calculations
The peak and average display current requirements
have a significant impact on power supply selection.
The maximum peak current is calculated with Equation
3 below.
The average current required by the display can be
calculated with Equation 4 below.
The power supply has to be able to supply IPEAK
transients and supply ILED (AVG) continuously. The
range on VLED allows noise on this supply without
significantly changing the display brightness.
P
MAX
MAXIMUM
POWER
DISSIPATION
PER
IC
-
W
D
0
25
TA - AMBIENT TEMPERATURE - C
0.7
0.6
0.5
0.4
0.3
0.2
0.1
60
55
50
45
40
35
30
0.8
0.9
1.0
1.1
1.2
85
80
75
70
65
90
1.3
R
Θ
= 100 C/W
J-A
Equation 1:
T JMAX = T A + P D * RθJA
Where:
T JMAX = maximum IC junction temperature
TA = ambient temperature surrounding the display
R
θ
JA = thermal resistance from the IC junction to ambient
PD = power dissipated by the IC
Equation 2:
PD = (N * I PIXEL * Duty Factor * V LED ) + ILOGIC * VLOGIC
Where:
PD = total power dissipation
N = number of pixels on (maximum 4 char * 5 * 7 = 140)
IPIXEL = peak pixel current.
Duty Factor = 1/8 * Osccyc/64
Osc cyc = number of ON oscillator cycles per row
ILOGIC = IC logic current
VLOGIC = logic supply voltage
Equation 3:
IPEAK = M * 20 * IPIXEL
Where:
IPEAK = maximum instantaneous peak current for the display
M = number of ICs in the system
20 = maximum number of LEDs on per IC
IPIXEL = peak current for one LED
Equation 4:
ILED (AVG) = N * I PIXEL* 1/8 * (oscillator cycles)/64
(see Variable Definitions above)
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