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參數(shù)資料
| 型號： | EL5225IRZ-T13 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | 10-Channel TFT-LCD Reference Voltage Generator |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO24 |
| 封裝： | LEAD FREE, MO-153, TSSOP-24 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 859K |
| 代理商： | EL5225IRZ-T13 |
9
FN7356.0
March 11, 2004
will repeat every 10-clock cycles for each channel. The time
takes to update the output depends on the timing at the V
IN
and the state of the switches. It can take 1 to 10 clock cycles
to update each output.
For the sample and hold capacitor CH to maintain the
correct output voltage, the driving load shouldn’t be changed
at the rising edge of the OSC signal. Since at the rising edge
of the OSC clock, the refreshed switches are being opened,
if the load changes at that time, it will generate an error
output voltage. For a fixed load condition, the internal
oscillator can be used.
For the transient load condition, the external OSC mode
should be used to avoid the conflict between the rising edge
of the OSC signal and the changing load. So a timing delay
circuit will be needed to delay the OSC signal and avoid the
rising edge of the OSC signal and changing the load at the
same time.
FIGURE 12. TRANSIENT LOAD RESPONSE
Channel 3 - sinking and sourcing 5mA current
Channel 2 - EXT_OSC signal
Channel 1 - V
OUT
Here, the OSC signal is synchronized to the load signal. The
rising edge of the OSC signal is then delayed by some
amount of time and gives enough time for CH to be charged
to a new voltage before the switches are opened.
FIGURE 13. CHANNEL-TO-CHANNEL REFRESH
Ch1 - Output1
Ch3 - Output2
Ch2 - EXT_OSC
At the falling edge of the OSC, output 1 is refreshing and one
clock cycle later, output2 is being refreshed. The spike you
see here is the response of the output amplifier when the
refreshed switches are closed. When driving a big capacitor
load, there will be ringing at the spikes because the phase
margin of the amplifier is decreased.
The speed of the external OSC signal shouldn’t be greater
than 70kHz because for the worst condition, it will take at
least 4μs to charge the sample and hold Capacitor CH. The
pulse width has to be at least 4μs long. From our lab test, the
duty cycle of the OSC signal must be greater than 30%.
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
M=400μs/DIV
V
OUT
I
OUT
OSC
M=400μs/DIV
V
OUT2
V
OUT1
OSC
P
DMAX
T
- T
JA
--------------------------------------------
=
EL5225
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