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参数资料
| 型号： | ISL97650ARTZ-TK |
| 厂商： | Intersil |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY HP 4CHAN 36-TQFN |
| 标准包装： | 1 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 250µA |
| 电源电压： | 4 V ~ 14 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-WFQFN 裸露焊盘 |
| 供应商设备封装： | 36-TQFN 裸露焊盘（6x6） |
| 包装： | 标准包装 |
| 产品目录页面： | 1249 (CN2011-ZH PDF) |
| 其它名称： | ISL97650ARTZ-TKDKR |
ISL97650
Cascaded MOSFET Application
An 20V N-channel MOSFET is integrated in the boost
regulator. For the applications where the output voltage is
Feedback Resistors
The buck converter output voltage is determined by the
Equation 13:
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 .
R 14 + R 15
R 15
V LOGIC = --------------------------- × V FBL
(EQ. 13)
V IN
INTERSIL
LX1, LX2
FBB
A VDD
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.
ISL97650
Buck Converter Input Capacitor
The capacitor should support the maximum AC RMS current
which happens when D = 0.5 and maximum output current.
FIGURE 15. CASCADED MOSFET TOPOLOGY FOR HIGH
I acrms ( C IN ) =
D ? ( 1 – D ) ? I O
(EQ. 14)
OUTPUT VOLTAGE APPLICATIONS
Buck Converter
The buck converter is the step down converter, which
Where I o is the output current of the buck converter. Table 6
shows some recommendations for input capacitors.
TABLE 6. INPUT CAPACITOR (BUCK) RECOMMENDATION
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 shown in Equation 10:
CAPACITOR
10μF/16V
10μF/10V
22μF/16V
SIZE
1206
0805
1210
VENDOR
TDK
Murata
Murata
PART NUMBER
C3216X7R1C106M
GRM21BR61A106K
C3225X7R1C226M
V LOGIC
---------------------- = D
V IN
(EQ. 10)
Buck Inductor
An 3.3μH to 10μH inductor is the good choice for the buck
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
Equation 11:
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
recommendations for buck inductor.
I OMAX = 2A – Δ I pp
(EQ. 11)
TABLE 7. BUCK INDUCTOR RECOMMENDATION
DIMENSIONS
Where Δ I pp is the ripple current in the buck inductor as
Equation 12,
INDUCTOR
4.7μH/
2.7A PEAK
(mm)
5.7x5.0x4.7
VENDOR
Murata
PART NUMBER
LQH55DN4R7M01K
Δ I pp = ---------------------- ? ( 1 – D )
V LOGIC
L ? f s
(EQ. 12)
6.8μH/
3A PEAK
7.3x6.8x3.2
TDK
RLF7030T-6R8M2R8
Where L is the buck inductor, f s is the switching frequency
(1.2MHz).
13
10μH/
2.4A PEAK
12.95x9.4x3.0 Coilcraft
DO3308P-103
FN9198.4
April 17, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97650BIRTZ-T | 功能描述:直流/直流开关调节器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97650BIRTZ-TK | 功能描述:直流/直流开关调节器 4-CH INTEGRTD LCD SUPPLY 36LD TQFN RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL97651ARTZ | 制造商:Intersil Corporation 功能描述: |
| ISL97651ARTZ-T | 功能描述:显示驱动器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| ISL97651ARTZ-TK | 功能描述:显示驱动器和控制器 ISL97651ARTZ 4-CH IN TEGRTD LCD SUPY 1K RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
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