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参数资料
| 型号： | ISL97652IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 15/25页 |
| 文件大小： | 0K |
| 描述： | IC LCD SUPPLY 4CH DUAL AMP 48QFN |
| 标准包装： | 4,000 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 500µA |
| 电源电压： | 8 V ~ 15 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-VFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（7x7） |
| 包装： | 带卷 (TR) |
ISL97652
than the maximum input voltage. The peak current rating is 2A,
and the average current should be as the following equation,
Regulated Charge Pump Controllers (V ON and
V OFF )
I AVG = ( 1 – D ) *I o
(EQ. 13)
The ISL97652 includes 2 independent charge pumps (see
charge pump block and connection diagram). The negative
Where I o is the output current of buck converter. The
following table shows some diode recommended.
TABLE 8. BUCK RECTIFIER DIODE RECOMMENDATION
charge pump inverters the V SUP voltage and provides a
regulated negative output voltage. The positive charge pump
doubles or triples the V SUP voltage and provided a regulated
positive output voltage. The regulation of both the negative
DIODE
PMEG2020EJ
SS22
V R /I AVG
RATING
20V/2A
20V/2A
PACKAGE
SOD323F
SMB
VENDOR
Philips
Semiconductors
Fairchild
and positive charge pumps is generated by internal
comparator that senses the output voltage and compares it
with the internal reference.
The pumps use pulse width modulation to adjust the pump
Semiconductor
Output Capacitor (Buck Converter)
Four 10μF or two 22μF ceramic capacitors are recommended
for this part. The overshoot and undershoot will be reduced
with more capacitance, but the recovery time will be longer.
TABLE 9. BUCK OUTPUT CAPACITOR RECOMMENDATION
period, depending on the load present. The pumps can
provide 30mA for V OFF and 20mA for V ON .
Positive Charge Pump Design Consideration
The positive charge pump can drive multiple stages for 2X/
3X step up ratios, or higher. Internal switches (M1 and M2)
drive external steering diodes via the pump capacitor CP.
Figure 18A shows 2X configuration and Figure 18B shows
CAPACITOR
10μF/6.3V
10μF/6.3V
22μF/6.3V
100μF/6.3V
SIZE
0805
0805
1210
1206
VENDOR
TDK
Murata
TDK
Murata
PART NUMBER
C2012X5R0J106M
GRM21BR60J106K
C3216X5R0J226M
GRM31CR60J107M
3X configuration. The output voltage is divided by feedback
resistors R7 and R8, which is then compared to the internal
reference via comparator A1. The maximum V ON charge
pump current can be estimated from the following equations
assuming a 50% switching duty:
I MAX ( 2x ) ～ min of 50mA or
2 ? V SUP – 2 ? V DIODE ( 2 ? I MAX ) – V ( V ON )
( 2 ? ( R ONH + R ONL ) )
3 ? V SUP – 4 ? V DIODE ( 2 ? I MAX ) – V ( V ON )
4 ? ( R ONH + R ONL )
PI Loop Compensation (Buck Converter)
The buck converter of ISL97652 can be compensated by a
RC network connected from VCB pin to ground. C CB = 4.7nF
and R CB = 10k RC network is used in the demo board. The
larger value resistor can lower the transient overshoot,
however, at the expense of stability of the loop.
The stability can be optimized in a similar manner to that
described in the section on "PI Loop Compensation (Boost
Converter)”.
Bootstrap Capacitor (C B )
This capacitor is used to provide the supply to the high driver
circuitry for the buck MOSFET. The bootstrap supply is
formed by an internal diode and capacitor combination. A
470nF is recommended for ISL97652. A low value capacitor
can lead to overcharging and in turn damage the part.
If the load is too light, the on-time of the low side diode may
be insufficient to replenish the bootstrap capacitor voltage.
In this case, if V IN -V BUCK <1.5V, the internal MOSFET
pull-up device may be unable to turn-on until V LOGIC falls.
Hence, there is a minimum load requirement in this case.
The minimum load can be adjusted by the feedback
resistors to FBB.
15
---------------------------------------------------------------------------------------------------------------------- ? 0.95A
(EQ. 14)
I MAX ( 3x ) ～ min of 50mA or
---------------------------------------------------------------------------------------------------------------------- ? 0.95A
FN9287.1
November 2, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97652IRZ-TK | 功能描述:IC LCD SUPPLY 4CH DUAL AMP 48QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| ISL97653AIRZ | 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-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: |
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