参数资料
| 型号： | EL7640AILTZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC CONV DC/DC TFT-LCD 32-QFN |
| 标准包装： | 1,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 3 |
| 输出电压： | 5.5 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
EL7640A, EL7641A, EL7642A
V BOOST
LX
The V OFF power supply is used to power the negative
supply of the row driver in the LCD panel. The DC/DC
0.9V
LDO_ON
0.1μF
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
PG_LDOP
+
36V
CP (TO 36V)
LDO_OFF regulator uses an external NPN transistor as the
-
ESD
CLAMP
R BP
700 ?
DRVP
0.1μF
V ON (TO 35V)
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
+
FBP
R P1
R P2
20k ?
C ON
of 10). Typical V OFF voltage supported by EL7640A,
EL7641A and EL7642A ranges from -5V to -25V. A fault
comparator is also included for monitoring the output
-
GMP
1: Np
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 REF × ? 1 + ---------- ?
V OFF = V REFN + ---------- × ( V REFN – V REF )
R
FIGURE 19. V ON FUNCTIONAL BLOCK DIAGRAM
LX
0.1μF
CP (TO -26V)
V ON , V OFF and V LOGIC are determined by the following
equations:
? R 12 ?
? R 11 ?
R 22
21
PG_LDON
0.4V
-
+
LDO_OFF
FBN
V REF
R N2
20k ?
0.1μF
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
-
+
GMN
1: Nn
36V
DRVN
R BN
700 ?
R N1
V OFF (TO -20V)
C OFF
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.
ESD
CLAMP
V IN
CHARGE PUMP
OR V BOOST OUTPUT
FIGURE 20. V OFF FUNCTIONAL BLOCK DIAGRAM
700 ?
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
EL764X
DRVP
NPN
CASCODE
TRANSISTOR
Q11
V ON
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 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.
13
FBP
FIGURE 21. CASCODE NPN TRANSISTOR CONFIGURATION
FOR HIGH CHARGE PUMP OUTPUT VOLTAGE
(>36V)
FN6270.0
May 15, 2006
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