- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384533 > ISL97652IRZ-T (INTERSIL CORP) 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers PDF資料下載
參數(shù)資料
| 型號： | ISL97652IRZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| 中文描述： | 2.5 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PQCC48 |
| 封裝： | 7 X 7 MM, ROHS COMPLIANT, PLASTIC, MO-220VKKD-2, QFN-48 |
| 文件頁數(shù)： | 17/25頁 |
| 文件大?。?/td> | 709K |
| 代理商： | ISL97652IRZ-T |
17
FN9287.0
December 21, 2006
The maximum V
OFF
output voltage of a single stage charge pump is:
R5 and R6 in the Typical Application Diagram determine
V
OFF
output voltage.
Charge Pump Supply
The magnitude of the SUP supply will determine the charge
pump diode configuration; whether x2 or x3 for the positive
charge pump or x1 or x2 for the negative charge pump.
An independent charge pump supply pin 13 (SUP) is
provided and this may be connected to Vin, Vmain, AVDD or
some other suitable supply.
Note that if AVDD is chosen for the SUP supply, then a
potential fault-like interaction with the supply sequencing
and fault checking is present; when EN1 goes high (with
EN2 low), fault checking on the VOFF charge pump is
started by the voltage ramp on DEL1. If this pin reaches
~1.9V before VOFF is within 90% of it's regulation voltage
then the buck converter (Tcon bias) and Voff will be
continually re-started. This condition will arise if the SUP
supply has not been activated by EN2 going high before
DEL1 has reached 1.9V. One solution would be to increase
the capacitance on DEL1 to overlap enough in time with the
EN2 going high. This does have the disadvantage of
lengthening the fault detection time of the VOFF charge
pump under true fault conditions and it also lengthens the
initial VOFF turn-on time. Another solution would be to
supply SUP from Vmain as long as the magnitude of Vmain
(without the boost running) is large enough to satisfy the
regulated VOFF supply.
Improving Charge Pump Noise Immunity
Depending on PCB layout and environment, noise pick-up at
the FBP and FBN inputs, which may degrade load regulation
performance, can be reduced by the inclusion of capacitors
across the feedback resistors (e.g. in the Application
Diagram, C4 and C5 for the positive charge pump).
Set R7 C4 = R8 C5 with C4 ~ 100pF.
V
ON-SLICE
Circuit Operation
The Von slice circuit functions as a three way multiplexer,
switching VGHM between ground, VGL and VGH (typ 15-
30V). Voltage selection is provided by digital inputs VDPM
(enable) and VFLK (control). HIGH to LOW delay and slew
control is provided by external components on pins CE and
RE respectively. The block diagram of the VON-SLICE
circuit is shown in Figure 3.
When VDPM is LOW, the block is disabled and VGHM is
grounded.
When VDPM is HIGH, VGHM is determined by VFLK; when
VFLK goes LOW, there is a delay controlled by the capacitor
attached to the CE pin, following which VGHM is driven to
VGL, with a slew rate controlled by the resistor attached to
the RE pin. Note that VGL is used only as a reference
voltage for an amplifier, thus does not have to source or sink
a significant DC current. When VFLK goes HIGH, VGHM is
FIGURE 19. NEGATIVE CHARGE PUMP BLOCK DIAGRAM
FAULT
0.5V
CLK
EN
VDC
V
SUP
FBN
DRVN
GND
STOP
PWM
CONTROL
V
REF
R5
40.2k
C2
820pF
C3
100pF
R6
453k
V
OFF
(-8V)
C
OFF
1μF
D4
D3
C
N
0.1μF
A2
0.53V
A1
M1
M2
F
OSC
V
OFF_MAX
2x
(
)
V
SUP
–
V
DIODE
2
I
OUT
R
ON
NOUT
(
)
H
R
ON
NOUT
(
)
L
+
(
)
+
+
=
(EQ. 18)
V
OFF
V
FBN
1
-------
+
V
REF
–
-------
=
(EQ. 19)
ISL97652
相關PDF資料 |
PDF描述 |
|---|---|
| ISL97652IRZ-TK | 4-Channel Integrated LCD Supply with Dual VCOM Amplifiers |
| ISL97653A | 5-Channel Integrated LCD Supply |
| ISL97653AIRZ | 5-Channel Integrated LCD Supply |
| ISL97653AIRZ-T | 5-Channel Integrated LCD Supply |
| ISL97653AIRZ-TK | 5-Channel Integrated LCD Supply |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| ISL97653AIRZ | 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 |
| 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 |
| ISL97653AIRZ-TK | 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 |
| ISL97653IRZ | 制造商:Intersil Corporation 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。