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參數(shù)資料
| 型號： | EL7641AILTZ-T7 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | TFT-LCD DC/DC with Integrated Amplifiers |
| 中文描述： | 0.15 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, MO-220, QFN-32 |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 458K |
| 代理商： | EL7641AILTZ-T7 |
13
FN6270.0
May 15, 2006
FIGURE 19. VON FUNCTIONAL BLOCK DIAGRAM
FIGURE 20. VOFF FUNCTIONAL BLOCK DIAGRAM
The VON power supply is used to power the positive supply
of the row driver in the LCD panel. The DC/DC consists of an
external diode-capacitor charge pump powered from the
inductor (LX) of the boost converter, followed by a low
dropout linear regulator (LDO_ON). The LDO_ON regulator
uses an external PNP transistor as the pass element. The
onboard LDO controller is a wide band (>10MHz)
transconductance amplifier capable of 5mA output current,
which is sufficient for up to 50mA or more output current
under the low dropout condition (forced beta of 10). Typical
VON voltage supported by EL7640A, EL7641A and
EL7642A ranges from +15V to +36V. A fault comparator is
also included for monitoring the output voltage. The under-
voltage threshold is set at 25% below the 1.2V reference.
The VOFF power supply is used to power the negative
supply of the row driver in the LCD panel. The DC/DC
consists of an external diode-capacitor charge pump
powered from the inductor (LX) of the boost converter,
followed by a low dropout linear regulator (LDO_OFF). The
LDO_OFF regulator uses an external NPN transistor as the
pass element. The onboard LDO controller is a wide band
(>10MHz) transconductance amplifier capable of 5mA
output current, which is sufficient for up to 50mA or more
output current under the low dropout condition (forced beta
of 10). Typical VOFF voltage supported by EL7640A,
EL7641A and EL7642A ranges from -5V to -25V. A fault
comparator is also included for monitoring the output
voltage. The under-voltage threshold is set at 200mV above
the 0.2V reference level.
Set-up Output Voltage
Refer to Typical Application Diagram, the output voltages of
VON, VOFF and VLOGIC are determined by the following
equations:
Where VREF = 1.2V, VREFN = 0.2V.
High Charge Pump Output Voltage (>36V)
Applications
In the applications where the charge pump output voltage is
over 36V, an external NPN transistor needs to be inserted in
between the DRVP pin and the base of pass transistor Q3 as
shown in Figure 21, or the linear regulator can control only
one stage charge pump and regulate the final charge pump
output as shown in Figure 22.
-
+
-
+
36V
ESD
CLAMP
GMP
LDO_ON
PG_LDOP
1: Np
FBP
DRVP
700
RBP
VBOOST
0.1F
CP (TO 36V)
20k
RP2
RP1
CON
VON (TO 35V)
LX
0.9V
-
+
-
+
36V
ESD
CLAMP
GMN
LDO_OFF
1: Nn
FBN
DRVN
0.1F
CP (TO -26V)
RBN
COFF
VOFF (TO -20V)
LX
RN1
RN2
20k
VREF
PG_LDON
0.4V
700
VON
VREF 1
R12
R11
----------
+
×
=
VOFF
VREFN
R22
R21
----------
VREFN VREF
–
()
×
+
=
VIN
OR VBOOST
CHARGE PUMP
OUTPUT
700
Q11
FBP
DRVP
NPN
CASCODE
TRANSISTOR
EL764X
VON
FIGURE 21. CASCODE NPN TRANSISTOR CONFIGURATION
FOR HIGH CHARGE PUMP OUTPUT VOLTAGE
(>36V)
EL7640A, EL7641A, EL7642A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7641ILTZ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7641ILTZ TFT-LCD D DC-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7641ILTZ-T13 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7641ILTZ TFT-LCD D DC-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7641ILTZ-T7 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7641ILTZ TFT-LCD D DC-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7642 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:TFT-LCD DC/DC with Integrated Amplifiers |
| EL7642AILTZ | 功能描述:LCD 驅(qū)動器 EL7642AILTZ TFT-LCD DC-DC W/INTEGRTD AMP RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
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