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參數(shù)資料
| 型號： | ADD8754ACPZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | LCD Panel Power, VCOM, and Gate Modulation |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, MO-220VGGD-2, LFCSP-24 |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 405K |
| 代理商： | ADD8754ACPZ-REEL7 |
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ADD8754
POWER DISSIPATION
The ADD8754’s maximum power dissipation depends on the
thermal resistance from the IC die to the ambient environment
and the ambient temperature. The thermal resistance depends
on the IC package, PC board copper area, other thermal mass,
and airflow. The ADD8754, with the exposed backside pad
soldered to a 2-layer PC board with nine 12 mil-diameter
thermal vias, can dissipate about 1.5 W into 65°C still air before
the die exceeds 125°C. More PC board copper, cooler ambient
air, and more airflow increase the dissipation capability, whereas
less copper or warmer air decreases the IC’s dissipation capability.
The major contributors to the power dissipation are the LDO
regulator and the V
COM
amplifier.
Step-Up Converter
The largest portions of power dissipation in the step-up
converter are the internal MOSFET, the inductor, and the output
diode. For a 90% efficiency step-up converter, about 3% to 5% of
the power is lost in the internal MOSFET, about 3% to 4% in the
inductor, and about 1% in the output diode. The rest of the 1%
to 3% is distributed among the input and output capacitors and
the PC board traces. For an input power of about 3 W, the
power lost in the internal MOSFET is about 90 mW to 150 mW.
LDO
The power dissipated in the LDO depends on the output
current, the output voltage, and the supply voltage:
Rev. 0 | Page 18 of 28
PD
LDO
= (VIN_1 LDO_OUT) × I
LDO_OUT
V
COM
Amplifier
The power dissipated in the V
COM
amplifier depends on the
output current, the output voltage, and the supply voltage:
PD
SOURCE
=
I
OUT
(
source
) × (V
DD_2
V
OUT
)
PD
SINK
=
I
OUT
(
sink
) ×
V
OUT
where:
I
OUT
(
source
) is the output current sourced by the V
COM
amplifier.
I
OUT
(
sink
) is the output current that the V
COM
amplifier sinks to
AGND.
In a typical case where the supply voltage is 12 V and the output
voltage is 6 V with an output source current of 20 mA, the
power dissipated is 120 mW.
Thermal Overload Protection
Thermal overload protection prevents excessive power dissipation
from overheating the ADD8754. When the junction temperature
exceeds T
J
= 145°C, a thermal sensor immediately activates the
fault protection, which shuts down the device, allowing the IC
to cool. The device self-starts once the die temperature falls
below T
J
= 105°C.
Thermal overload protection protects the controller in the event
of fault conditions. For continuous operation, do not exceed the
absolute maximum junction temperature rating of T
J
= 125°C.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADD8754BACPZ-REEL | 制造商:Analog Devices 功能描述: |
| ADD8754BACPZ-REEL7 | 制造商:Analog Devices 功能描述: |
| ADD8754DACPZ-REEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADD8754DACPZ-REEL7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADD8754-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Evaluation Kit for LCD Power, VCOM, and Gate Modulation |
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