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參數(shù)資料
| 型號(hào)： | EL7642ILTZ |
| 廠(chǎng)商： | INTERSIL CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | TFT-LCD DC/DC with Integrated Amplifiers |
| 中文描述： | 3 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, MO-220, TQFN-32 |
| 文件頁(yè)數(shù)： | 13/19頁(yè) |
| 文件大小： | 493K |
| 代理商： | EL7642ILTZ |
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13
FN7415.1
September 26, 2005
FIGURE 19. V
ON
FUNCTIONAL BLOCK DIAGRAM
FIGURE 20. V
OFF
FUNCTIONAL BLOCK DIAGRAM
The V
ON
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
V
ON
voltage supported by EL7640, EL7641 and EL7642
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 V
OFF
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 V
OFF
voltage supported by EL7640, EL7641
and EL7642 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
V
ON
, V
OFF
and V
LOGIC
are determined by the following
equations:
Where V
REF
= 1.2V, V
REFN
= 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
R
BP
V
BOOST
0.1μF
0.1μF
CP (TO 36V)
20k
R
P2
R
P1
C
ON
V
ON
(TO 35V)
LX
0.9V
-
+
GMN
-
+
36V
ESD
CLAMP
LDO_OFF
1: Nn
FBN
DRVN
0.1μF
0.1μF
CP (TO -26V)
R
BN
700
C
OFF
V
OFF
(TO -20V)
LX
R
N1
R
N2
20k
V
REF
PG_LDON
0.4V
V
ON
V
REF
1
R
11
---------
+
×
=
V
OFF
V
REFN
R
21
---------
V
REFN
V
REF
–
(
)
×
+
=
V
IN
OR V
BOOST
CHARGE PUMP
OUTPUT
700
Q11
FBP
DRVP
NPN
CASCODE
TRANSISTOR
EL764X
V
ON
FIGURE 21. CASCODE NPN TRANSISTOR CONFIGURATION
FOR HIGH CHARGE PUMP OUTPUT VOLTAGE
(>36V)
EL7640, EL7641, EL7642
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EL7640ILTZ-T13 | TFT-LCD DC/DC with Integrated Amplifiers |
| EL7641ILTZ-T13 | TFT-LCD DC/DC with Integrated Amplifiers |
| EL7642ILTZ-T13 | TFT-LCD DC/DC with Integrated Amplifiers |
| EL7642 | TFT-LCD DC/DC with Integrated Amplifiers |
| EL7761 | 100V Half Bridge Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7642ILTZ-T13 | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 EL7642ILTZ TFT-LCD D C-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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 |
| EL7642ILTZ-T7 | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 EL7642ILTZ TFT-LCD D C-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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 |
| EL7661CN | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:IC-100V FULL BRIDGE DRIVER |
| EL7661CS | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:MOSFET Driver |
| EL7761 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:100V Half Bridge Driver |
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