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參數(shù)資料
| 型號： | ISL97650ARTZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | 4-Channel Integrated LCD Supply |
| 中文描述： | LIQUID CRYSTAL DISPLAY DRIVER, PQCC36 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, PLASTIC, MO-220WJJD-1, TMLFP-36 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 333K |
| 代理商： | ISL97650ARTZ-T |
13
FN9198.3
November 28, 2006
Cascaded MOSFET Application
An 20V N-channel MOSFET is integrated in the boost
regulator. For the applications where the output voltage is
greater than 20V, an external cascaded MOSFET is needed
as shown in Figure 15. The voltage rating of the external
MOSFET should be greater than A
VDD
.
Buck Converter
The buck converter is the step down converter, which
supplies the current to the logic circuit of the LCD system.
The ISL97650 integrates an 20V N-channel MOSFET to
save cost and reduce external component count. In the
continuous current mode, the relationship between input
voltage and output voltage is as following:
Where D is the duty cycle of the switching MOSFET.
Because D is always less than 1, the output voltage of buck
converter is lower than input voltage.
The peak current limit of buck converter is set to 2A, which
restricts the maximum output current (average) based on the
following equation:
Where
Δ
I
pp
is the ripple current in the buck inductor as the
following equation,
Where L is the buck inductor, f
s
is the switching frequency
(1.2MHz).
Feedback Resistors
The buck converter output voltage is determined by the
following equation:
Where R14 and R15 are the feedback resistors of buck
converter to set the output voltage Current drawn by the
resistor network should be limited to maintain the overall
converter efficiency. The maximum value of the resistor
network is limited by the feedback input bias current and the
potential for noise being coupled into the feedback pin. A
resistor network in the order of 1k
Ω
is recommended.
Buck Converter Input Capacitor
The capacitor should support the maximum AC RMS current
which happens when D = 0.5 and maximum output current.
Where I
o
is the output current of the buck converter. The
following table shows some recommendations for input
capacitor.
Buck Inductor
An 3.3μH-10μH inductor is the good choice for the buck
converter. Besides the inductance, the DC resistance and
the saturation current are also the factor needed to be
considered when choosing buck inductor. Low DC
resistance can help maintain high efficiency, and the
saturation current rating should be 2A. Here are some
FIGURE 15. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
INTERSIL
ISL97650
LX1, LX2
FBB
A
VDD
V
IN
V
IN
---------------------
D
=
(EQ. 10)
I
OMAX
2A
Δ
I
pp
–
=
(EQ. 11)
Δ
I
pp
V
L f
s
---------------------
1
D
–
(
)
=
(EQ. 12)
TABLE 6. INPUT CAPACITOR (BUCK) RECOMMENDATION
CAPACITOR
SIZE
VENDOR
PART NUMBER
10μF/16V
1206
TDK
C3216X7R1C106M
10μF/10V
0805
Murata
GRM21BR61A106K
22μF/16V
1210
Murata
C3225X7R1C226M
TABLE 7. BUCK INDUCTOR RECOMMENDATION
INDUCTOR
DIMENSIONS
(mm)
VENDOR
PART NUMBER
4.7μH/
2.7A
PEAK
5.7x5.0x4.7
Murata
LQH55DN4R7M01K
6.8μH/
3A
PEAK
7.3x6.8x3.2
TDK
RLF7030T-6R8M2R8
10μH/
2.4A
PEAK
12.95x9.4x3.0 Coilcraft
DO3308P-103
V
LOGIC
R
--------------------------
R
+
15
V
FBL
×
=
(EQ. 13)
I
acrms
C
IN
(
)
D
1
D
–
(
)
I
O
=
(EQ. 14)
ISL97650
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| ISL97650ARTZ-TK | 4-Channel Integrated LCD Supply |
| ISL97652 | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| ISL97652IRZ | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| ISL97652IRZ-T | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| ISL97652IRZ-TK | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL97650ARTZ-TK | 功能描述:顯示驅(qū)動(dòng)器和控制器 ISL97650ARTZ-TK 4-CH INTEGRTD LCD SUPY 1K RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| ISL97650BIRTZ-T | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| ISL97650BIRTZ-TK | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| ISL97651ARTZ | 制造商:Intersil Corporation 功能描述: |
| ISL97651ARTZ-T | 功能描述:顯示驅(qū)動(dòng)器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
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