参数资料
| 型号： | EL5525IREZ-T13 |
| 厂商： | Intersil |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC VREF GEN 18CH TFTLCD 38HTSSOP |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 4.5 V ~ 16.5 V |
| 输出数： | 18 |
| 输出电压： | 0.5 V ~ 14.95 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-TFSOP （0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 38-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
EL5525
takes to update the output depends on the timing at the V IN
and the state of the switches. It can take 1 to 18 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.
Ch1 --- Output1
Ch3 --- Output2
Ch2 --- EXT_OSC
At the falling edge of the OSC, output 1 is being refreshed,
and one clock cycle later, output 2 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: Equation 2:
Θ JA
T JMAX - T AMAX
P DMAX = ---------------------------------------------
(EQ. 2)
FIGURE 8. TRANSIENT LOAD RESPONSE
Channel 3 --- sinking and sourcing 5mA current
Channel 2 --- EXT_OSC signal
Channel 1 --- V OUT
In Figure Table 8 on page 8, 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
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.
opened.
FIGURE 9. CHANNEL TO CHANNEL REFRESH
8
P DMAX = V S × I S + Σ [ ( V S - V OUT i ) × I LOAD i ]
when sourcing, and:
P DMAX = V S × I S + Σ ( V OUT i × I LOAD i )
when sinking.
Where:
? i = 18
? 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
(EQ. 3)
(EQ. 4)
FN7393.2
September 21, 2010
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相关代理商/技术参数 |
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| EL5525IREZ-T7 | 功能描述:LCD Gamma缓冲器 EL5525IREZ 18-CH TFT LCDFERENCE VAGE GEN RoHS:否 制造商:Maxim Integrated 输入补偿电压: 转换速度: 电源电压-最大:20 V 电源电压-最小:9 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-38 封装:Tube |
| EL552-6 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Logic IC |
| EL552-7 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Logic IC |
| EL552-8 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Logic IC |
| EL552-9 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Logic IC |
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