参数资料
| 型号： | EL7520AILZ-T13 |
| 厂商： | Intersil |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DC/DC 4-CHAN 20-QFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，TFT LCD |
| 输入电压： | 3 V ~ 5.5 V |
| 输出数： | 4 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
EL7520, EL7520A
The minimum base-emitter resistor, R BL , can now be
calculated as:
V IN OR V PROT
(3V TO 6V)
V LOGIC
R BL _min = V BE _max/(I_DRVL_min - Ic/Hfe_min) =
1.25V/(8mA - 500mA/100) = 417 ?
This is the minimum value that can be used - so, we now
choose a convenient value greater than this minimum value;
say 500 ? . Larger values may be used to reduce quiescent
current, however, regulation may be adversely affected, by
supply noise if R BL is made too high in value.
V BOOST
LX
0.1μF
0.9V
PG_LDOL
+
-
-
+
GML
LDO_LOG
R BL
500 ?
DRVL
FBL
R L1
R L2
20k ?
Q5
(1.3V TO 3.6V)
C LOG
10μF
0.9V
LDO_ON
1: N1
PG_LDOP
+
36V
CP (TO 36V)
-
+
-
GMP
ESD
CLAMP
R BP
7k ?
DRVP
FBP
R P1
R P2
20k ?
Q3
0.1μF
V ON (TO 35V)
C ON
FIGURE 29. V LOGIC 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
1: Np
FIGURE 27. V ON FUNCTIONAL BLOCK DIAGRAM
LX
0.1μF
CP (TO -26V)
onboard LDO controller is a wide band (>10MHz)
transconductance amplifier capable of 4mA drive current,
which is sufficient for up to 40mA or more output current
under the low dropout condition (forced beta of 10). Typical
V ON voltage supported by EL7520, EL7520A range 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
PG_LDON
0.4V
-
+
-
+
GMN
LDO_OFF
1: Nn
36V
FBN
DRVN
R BN
3k ?
V REF
R N2
20k ?
R N1
Q2
0.1μF
V OFF (TO -20V)
C OFF
pass element. The onboard LDO controller is a wide band
(>10MHz) transconductance amplifier capable of 4mA drive
current, which is sufficient for up to 40mA or more output
current under the low dropout condition (forced beta of 10).
Typical V OFF voltage supported by EL7520, EL7520A range
from -5V to -20V. A fault comparator is also included for
monitoring the output voltage. The undervoltage threshold is
set at 200mV above the 0.2V reference level.
The V LOGIC power supply is used to power the logic circuitry
within the LCD panel. The DC/DC may be powered directly
ESD
CLAMP
FIGURE 28. V OFF FUNCTIONAL BLOCK DIAGRAM
13
from the low voltage input, 3.3V or 5.0V, or it may be powered
through the fault protection switch. The LDO_LOGIC regulator
uses an external PNP transistor as the pass element. The
onboard LDO controller is a wide band (>10MHz)
transconductance amplifier capable of 16mA drive current,
which is sufficient for up to 160mA or more output current
FN7318.0
July 12, 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7520AILZ-T7 | 功能描述:电流型 PWM 控制器 EL7520AILZ 4-CH DC- DC CNTRLR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| EL7520ILZ | 功能描述:电流型 PWM 控制器 EL7520ILZ 4-CH DC-DC CNTRLR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| EL7520ILZ-T13 | 功能描述:电流型 PWM 控制器 EL7520ILZ 4-CH DC-DC CNTRLR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| EL7520ILZ-T7 | 功能描述:电流型 PWM 控制器 EL7520ILZ 4-CH DC-DC CNTRLR RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| EL7530 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Monolithic 600mA Step-Down Regulator with Low Quiescent Current |
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