参数资料
| 型号： | ISL97653AIRZ |
| 厂商： | Intersil |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY 5CHN 40-QFN |
| 标准包装： | 50 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 4mA |
| 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： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN 裸露焊盘（6x6） |
| 包装： | 管件 |
ISL97653A
limited during soft-start by adding a resistor (~75k Ω )
between gate and source of M0. In addition, a resistor can
be connected between PROT and the gate of M0, in order to
limit the maximum V GS of M0 at all times.
Buck Converter
The buck converter is a step down converter supplying
power to the logic circuit of the LCD system. The ISL97653A
Where I o is the output current of the buck converter. Table 6
shows some recommendations for the input capacitor.
TABLE 6. INPUT CAPACITOR (BUCK) RECOMMENDATION
CAPACITOR SIZE VENDOR PART NUMBER
10μF/16V 1206 TDK C3216X7R1C106M
10μF/10V 0805 Murata GRM21BR61A106K
integrates a high voltage N-channel MOSFET to save costs
22μF/16V
1210
Murata
C3225X7R1C226M
and reduce external component count. In the continuous
V LOGIC
V IN
---------------------- = D
current mode, the relationship between input voltage and
output voltage as expressed in Equation 8:
(EQ. 8)
Where D is the duty cycle of the switching MOSFET.
Because D is always less than 1, the output voltage of a
buck converter is lower than input voltage.
The peak current limit of buck converter is set to 2.5A, which
Buck Inductor
A 3.3μH to 10μH inductor range is recommended for the
buck converter. Besides the inductance, the DC resistance
and the saturation current are also factors that need to be
considered when choosing a buck inductor. Low DC
resistance can help maintain high efficiency. Saturation
current rating should be higher than 2A. Here are some
recommendations for the buck inductor.
TABLE 7. BUCK INDUCTOR RECOMMENDATION
restricts the maximum output current (average) based on
Equation 9:
INDUCTOR
DIMENSIONS
(mm)
VENDOR
PART NUMBER
I OMAX = 2.5A – Δ I P-P
(EQ. 9)
4.7μH/
2.7A PEAK
5.7x5.0x4.7
Murata
LQH55DN4R7M01K
Where Δ I P-P is the ripple current in the buck inductor as
shown in Equation 10:
6.8μH/
3A PEAK
7.3x6.8x3.2
TDK
RLF7030T-6R8M2R8
Δ I pp = ---------------------- ? ( 1 – D )
V LOGIC
L ? f s
(EQ. 10)
Rectifier Diode (Buck Converter)
A Schottky diode is recommended for fast recovery and low
Where L is the buck inductor, f s is the switching frequency
(680kHz).
Feedback Resistors
forward voltage. The reverse voltage rating should be higher
than the maximum input voltage. The peak current rating is
2.5A, and the average current is given by Equation 13:
The buck converter output voltage is determined by
Equation 11:
I avg = ( 1 – D ) *I o
(EQ. 13)
V LOGIC = --------------------------- × V FBL
R 14 + R 13
R 14
(EQ. 11)
Where I o is the output current of buck converter. The
following table shows some diode recommended.
TABLE 8. BUCK RECTIFIER DIODE RECOMMENDATION
Where R 13 and R 14 are the feedback resistors in the buck
converter loop 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.
DIODE
PMEG2020EJ
SS22
V R /I AVG
RATING
20V/2A
20V/2A
PACKAGE
SOD323F
SMB
VENDOR
Philips
Semiconductors
Fairchild
Semiconductor
Buck Converter Input Capacitor
Input capacitance should support the maximum AC RMS
current which occurs at D = 0.5 and maximum output
current.
I acrms ( C IN ) =
D ? ( 1 – D ) ? I O
13
(EQ. 12)
FN6367.3
September 7, 2010
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| ISL97653AIRZ-T | 功能描述:电流型 PWM 控制器 5-CH INTEGRTD LCD SUPPLY W/TEMP SENSOR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL97653AIRZ-TK | 功能描述:电流型 PWM 控制器 5-CH INTEGRTD LCD SUPPLY W/TEMP SENSOR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL97653IRZ | 制造商:Intersil Corporation 功能描述: |
| ISL97656IRTZ | 功能描述:IC REG BOOST ADJ 4A 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:两者兼有 输出数:1 输出电压:5V，1 V ~ 10 V 输入电压:3.5 V ~ 28 V PWM 型:电流模式 频率 - 开关:220kHz ~ 1MHz 电流 - 输出:600mA 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:16-QSOP |
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