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參數(shù)資料
| 型號： | EL5825IRZ-T7 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | 8-Channel TFT-LCD Reference Voltage Generator |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | ROHS COMPLIANT, MO-153, TSSOP-24 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 638K |
| 代理商： | EL5825IRZ-T7 |
9
FN7005.4
June 24, 2005
Channel Outputs
Each of the channel outputs has a rail-to-rail buffer. This
enables all channels to have the capability to drive to within
100mV of the power rails, (see Electrical Characteristics for
details).
When driving large capacitive loads, a series resistor should
be placed in series with the output. (Usually between 5
and
50
).
Each of the channels is updated on a continuous cycle, the
time for the new data to appear at a specific output will
depend on the exact timing relationship of the incoming data
to this cycle.
The best-case scenario is when the data has just been
captured and then passed on to the output stage
immediately; this can be as short as 40μs. In the worst-case
scenario this will be 320μs, when the data has just missed
the cycle.
When a large change in output voltage is required, the
change will occur in 2 volt steps, thus the requisite number of
timing cycles will be added to the overall update time. This
means that a large change of 16 volts can take between 2.56
milliseconds and 3 milliseconds depending on the absolute
timing relative to the update cycle.
Power Dissipation
With the 30mA maximum continues output drive capability
for each channel, it is possible to exceed the 125°C absolute
maximum junction temperature. Therefore, it is important to
calculate the maximum junction temperature for the
application to determine if load conditions need to be
modified for the part to remain in the safe operation.
The maximum power dissipation allowed in a package is
determined according to:
where:
T
JMAX
= Maximum junction temperature
T
AMAX
= Maximum ambient temperature
θ
JA
= Thermal resistance of the package
P
DMAX
= Maximum power dissipation in the package
The maximum power dissipation actually produced by the IC
is the total quiescent supply current times the total power
supply voltage and plus the power in the IC due to the loads.
when sourcing, and:
when sinking.
Where:
i = 1 to total 8
V
S
= Supply voltage
I
S
= Quiescent current
V
OUT
i = Output voltage of the i channel
I
LOAD
i = Load current of the i channel
By setting the two P
DMAX
equations equal to each other, We
can solve for the R
LOAD
's to avoid the device overheat. The
package power dissipation curves provide a convenient way
to see if the device will overheat.
Power Supply Bypassing and Printed Circuit
Board Layout
Good printed circuit board layout is necessary for optimum
performance. A low impedance and clean analog ground
plane should be used for the EL5825. The traces from the
two ground pins to the ground plane must be very short. The
thermal pad of the EL5825 should be connected to the
analog ground plane. Lead length should be as short as
possible and all power supply pins must be well bypassed. A
0.1μF ceramic capacitor must be place very close to the V
S
,
V
REFH
, V
REFL
, and CAP pins. A 4.7μF local bypass
tantalum capacitor should be placed to the V
S
, V
REFH
, and
V
REFL
pins.
Application Using the EL5825
In the application drawing, the schematic shows the
interconnect of a pair of EL5825 chips connected to give 8
gamma corrected voltages above the V
COM
voltage, and 8
gamma corrected voltages below the V
COM
voltage.
By using the serial data out pin, it is possible to daisy chain
(cascade) the two chips. In this mode the micro-controller
will send a 32-bit word that will update both the upper and
lower references voltages in one operation. See Application
Drawing 1 for details.
P
DMAX
T
- T
JA
--------------------------------------------
=
P
DMAX
V
S
I
S
Σ
V
S
(
- V
OUT
i
)
I
LOAD
i
×
[
]
+
×
=
P
DMAX
V
S
I
S
Σ
V
OUT
i
I
LOAD
i
×
(
)
+
×
=
EL5825
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| E-L5950 | 功能描述:線性穩(wěn)壓器 - 標準 5-Out 10/8.5/5/5/8V RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| E-L5970D | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.2 to 35V Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| E-L5970D13TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 POWER SUPPLY RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| E-L5971 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1.26 to 20V Step-Dwn RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| E-L5972D | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.235 to 35V Step-Dn RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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