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參數(shù)資料
| 型號(hào)： | EL7900ILCZ-T7 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Ambient Light Photo Detect IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO5 |
| 封裝： | 2.10 X 2 MM, ROHS COMPLIANT, PLASTIC, ODFN-5 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 172K |
| 代理商： | EL7900ILCZ-T7 |
6
FN7377.8
September 18, 2009
brightness and 1.25V represents the maximum. The first
step would be to determine the ratio of R1 and R2:
Next, the value of R2 can be calculated based on the
maximum output current coming from the EL7900 under the
application's maximum light exposure. Suppose the current
has been determined to be about 125A. Thus, R2 can be
and
In Figure 11, user adjustable bias control has been added to
allow control over the minimum and maximum output
voltage. This allows the user to adjust the output brightness
to personal preference over a limit range via the 3V PWM
control.
Figure 12 shows how a fully manual override can be quickly
added by using the EN pin.
Short Circuit Current Limit
The EL7900 does not limit the output short circuit current. If
the output is directly shorted to the ground continuously, the
output current could easily increase for a strong input light
such that the device may be damaged. Maximum reliability is
maintained if the output continuous current never exceeds
6mA by adding a load resistor at the output. This limit is set
by the design of the internal metal interconnects.
Suggested PCB Footprint
Footprint pads should be a nominal 1-to-1 correspondence
with package pads. The large, exposed central die-mounting
paddle in the center of the package requires neither thermal
nor electrical connections to PCB, and such connections
should be avoided.
Power Supply Bypassing and Printed Circuit
Board Layout
The EL7900 is relatively insensitive to the printed circuit
board layout due to its low speed operation. Nevertheless,
good printed circuit board layout is necessary for optimum
performance. Ground plane construction is highly
recommended, lead length should be as short as possible
and the power supply pins must be well bypassed to reduce
the risk of oscillation. For normal single supply operation,
where the GND pin is connected to ground, a 0.1F ceramic
capacitor should be placed from VCC pin to GND pin. A
4.7F tantalum capacitor should then be connected in
parallel, placed close to the device.
R
1
R
2
3.0V
0.25V
----------------
1
–
×
11
R
2
×
==
(EQ. 4)
3V TO 5V
SUPPLY VOLTAGE
3V DC VOLTAGE
EL7900
OUT
EN
GND
VDO
TO INVERTER BRIGHTNESS
CONTROLLER
C1
R2
R1
FIGURE 10. AUTOMATIC DIMMING SOLUTION
10k
25F
110k
INPUT OR LED DRIVER
R
2
1.25V
125
μA
------------------
10k
Ω
==
(EQ. 5)
R
1
11
R
2
×
110k
Ω
==
(EQ. 6)
3V TO 5V
SUPPLY VOLTAGE
3V PWM CONTROL
EL7900
OUT
EN
GND
VDO
FIGURE 11. AUTOMATIC DIMMING SOLUTION WITH
ADJUSTABLE BIAS CONTROL
C1
R2
R1
10k
25F
110k
TO INVERTER BRIGHTNESS
CONTROLLER
INPUT OR LED DRIVER
3V TO 5V
SUPPLY VOLTAGE
3V PWM CONTROL
EL7900
OUT
EN
GND
VDO
FIGURE 12. AUTOMATIC DIMMING SOLUTION WITH
ADJUSTABLE BIAS CONTROL AND MANUAL
OVERRIDE
ENABLE/
CONTROL
DISABLE
C1
R2
R1
10k
25F
110k
TO INVERTER
CONTROLLER
BRIGHTNESS
LED DRIVER
INPUT OR
EL7900
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7900ILCZ-T7A | 功能描述:環(huán)境光傳感器 EL7900ILCZ AMBIENT LIGHT PHOTO DETECT RoHS:否 制造商:Vishay Semiconductors 工作電源電壓: 峰值波長(zhǎng):570 nm 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:T-1 封裝:Bulk |
| EL8-0085 | 制造商:TE CONNECTIVITY 功能描述: |
| EL802 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:VIDEO OUTPUT PENTODE |
| EL81 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:OUTPUT PENTODE |
| EL8100 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:200MHz Rail-to-Rail Amplifiers |
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