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參數(shù)資料
| 型號： | ISL97652 |
| 廠商： | Intersil Corporation |
| 英文描述： | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| 中文描述： | 4通道集成LCD電源雙威科姆放大器 |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 709K |
| 代理商： | ISL97652 |
15
FN9287.0
December 21, 2006
than the maximum input voltage. The peak current rating is 2A,
and the average current should be as the following equation,
Where I
o
is the output current of buck converter. The
following table shows some diode recommended.
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.
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.
Regulated Charge Pump Controllers (V
ON
and
V
OFF
)
The ISL97652 includes 2 independent charge pumps (see
charge pump block and connection diagram). The negative
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
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
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
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:
TABLE 8. BUCK RECTIFIER DIODE RECOMMENDATION
DIODE
V
R
AVG
RATING
PACKAGE
VENDOR
PMEG2020EJ
20V/2A
SOD323F
Philips
Semiconductors
SS22
20V/2A
SMB
Fairchild
Semiconductor
TABLE 9. BUCK OUTPUT CAPACITOR RECOMMENDATION
CAPACITOR
SIZE
VENDOR
PART NUMBER
10μF/6.3V
0805
TDK
C2012X5R0J106M
10μF/6.3V
0805
Murata
GRM21BR60J106K
22μF/6.3V
1210
TDK
C3216X5R0J226M
100μF/6.3V
1206
Murata
GRM31CR60J107M
I
AVG
1
D
–
(
)
*I
o
=
(EQ. 13)
I
MAX
2x
2
V
-------------------------------------------------------------+
(
)
min of 50mA or
2
–
V
2
ONH
I
ONL
(
)
V V
ON
)
–
)
)
0.95A
～
I
MAX
3x
3
V
-------------------------------------------------------------+
(
)
min of 50mA or
4
–
V
2
ONH
I
ONL
(
)
V V
ON
)
–
)
0.95A
～
(EQ. 14)
ISL97652
相關PDF資料 |
PDF描述 |
|---|---|
| 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 |
| ISL97653A | 5-Channel Integrated LCD Supply |
| ISL97653AIRZ | 5-Channel Integrated LCD Supply |
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| ISL97652IRZ-TK | 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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| ISL97653AIRZ-T | 功能描述:電流型 PWM 控制器 5-CH INTEGRTD LCD SUPPLY W/TEMP SENSOR RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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