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| 型号： | STLED316SMTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 显示控制器 |
| 英文描述： | 4 X 17 SEGMENTS SEGMENT LED DRVR AND DSPL CTLR, PDSO24 |
| 封装： | ROHS COMPLIANT, SOP-24 |
| 文件页数： | 7/33页 |
| 文件大小： | 438K |
| 代理商： | STLED316SMTR |
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STLED316S
Recommended operating conditions
15/33
5.2
Power consumption estimation
Each port of the STLED316S can sink a maximum current of 40 mA into an LED with a
4.4 V forward voltage drop when operated from a supply voltage of 5.0 V. The minimum
voltage drop across the internal LED drivers is thus 5.0 - 4.4 = 0.6 V. The STLED316S can
sink 8 x 40 = 320 mA when all outputs are operating as LED segment drivers at full current.
On a 5.0 V supply, a STLED316S dissipates (5.0 V - 4.4 V) x 320 mA = 192 mW when
driving 8 of these 4.4 V forward voltage drop LEDs at full current. If the application requires
high drive current, consider adding a series resistor to each LED to drop excessive drive
voltage off-chip.
If the forward voltage of the LED is lesser than 4.4 V (say 2.4 V), then the maximum power
dissipation of STLED316S when all segments are turned on will be ( 5 - 2.4) V x
320 mA = 832 mW. To lower the power dissipation, consider adding a small series resistor
in the supply. Another alternative is to increase the value of the RSET to lower the current of
the LEDs from 40 mA to say 30 or 20 mA.
The efficiency will be the power consumption in the LEDs divided by the input power
consumed.
Efficiency = Vdiode x Idiode / VCC x ICC
As an example, consider LED with forward voltage of VF = 2.4V, Ipeak = 40 mA,
VCC (max) = 5.5 V, N = number of segments = 8 (max), D = duty cycle = 15/16,
Power dissipation, PD (max) = 5 mA x 5.5 V + (5.5 - 2.4) V x (15/16) x 40 mA x 8 = 27.5 + 780
= 807.5 mW. To lower this value, add a series resistor with the supply.
5.3
Capacitance
5.4
Power supply characteristics
Table 7.
Capacitance (TA =25°C, f=1MHz)
Symbol
Parameter
Test conditions
Min
Typ
Max
Unit
CIN
Input capacitance
15
pF
Table 8.
Power supply characteristics (TA = -40 to +85 °C)
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
ISTBY
Quiescent power supply
current
VCC = 5.5 V,
All inputs = VCC or GND
50
1000
A
ICC
Operating power supply
current
(display ON)
All segments ON, all digits
scanned, intensity set to full,
internal oscillator, no display
load connected
10
15
mA
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