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參數(shù)資料
| 型號： | ISL97651 |
| 廠商： | Intersil Corporation |
| 英文描述： | 4-Channel Integrated LCD Supply |
| 中文描述： | 4通道集成LCD電源 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大小： | 307K |
| 代理商： | ISL97651 |
13
FN7493.2
March 15, 2007
Buck Converter
The buck converter is the step down converter, which
supplies the current to the logic circuit of the LCD system.
The ISL97651 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 shown in Equation 9:
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
Equation 10:
Where
Δ
I
PP
is the ripple current in the buck inductor as the
Equation 11:
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
Equation 12:
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. Table 6
shows some recommendations for input capacitor.
Buck Inductor
An inductor value in the range 3.3μH to 10μH is
recommended for the buck converter. Besides the
inductance, the DC resistance and the saturation current
should also be considered when choosing buck inductor.
Low DC resistance can help maintain high efficiency, and the
saturation current rating should be at least 2A. Table 7
shows some recommendations for buck inductor.
Rectifier Diode (Buck Converter)
A Schottky diode is recommended due to fast recovery and
low forward voltage. The reverse voltage rating should be
higher than the maximum input voltage. The peak current
rating is 2A, and the average current should be as the
Equation 14:
Where I
O
is the output current of buck converter. Table 8
shows some diode recommended.
FIGURE 12. CASCADED MOSFET TOPOLOGY FOR HIGH
OUTPUT VOLTAGE APPLICATIONS
INTERSIL
ISL97651
LX1, LX2
FBB
A
VDD
V
IN
V
IN
---------------------
D
=
(EQ. 9)
I
OMAX
2A
Δ
I
pp
–
=
(EQ. 10)
Δ
I
pp
V
s
---------------------
1
D
–
(
)
=
(EQ. 11)
V
LOGIC
R
--------------------------
R
+
15
V
REF
×
=
(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
TABLE 8. BUCK RECTIFIER DIODE RECOMMENDATION
DIODE
V
R
/I
AVG
RATING
PACKAGE
VENDOR
PMEG2020EJ
20V/2A
SOD323F
Philips Semiconductors
SS22
20V/2A
SMB
Fairchild Semiconductor
I
ACRMS
C
IN
(
)
D
1
D
–
(
)
I
O
=
(EQ. 13)
I
AVG
1
D
–
(
)
*I
o
=
(EQ. 14)
ISL97651
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ISL97651ARTZ | 制造商:Intersil Corporation 功能描述: |
| ISL97651ARTZ-T | 功能描述:顯示驅動器和控制器 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: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| ISL97651ARTZ-TK | 功能描述:顯示驅動器和控制器 ISL97651ARTZ 4-CH IN TEGRTD 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: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| ISL97652IRZ | 功能描述:IC LCD SUPPLY HP 4CHN 48-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應商設備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL97652IRZ-T | 功能描述:IC LCD SUPPLY 4CH DUAL AMP 48QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應商設備封裝:56-TQFN-EP（8x8） 包裝:管件 |
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