参数资料
| 型号： | EL7585ILZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY TFT-LCD 20-QFN |
| 标准包装： | 1,000 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 3 V ~ 5 V |
| 输出数： | 4 |
| 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： | 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) |
EL7585
The base-emitter saturation voltage is: Vbe_max = 1.25V
(note this is normally a Vbe ~ 0.7V, however, for the Q5
transistor an internal Darlington arrangement is used to
increase it's current gain, giving a 'base-emitter' voltage of
2 x V BE ).
LX
0.1μF
CP (TO -26V)
(Note that using a high current Darlington PNP transistor for
Q5 requires that V IN > V LOGIC + 2V. Should a lower input
voltage be required, then an ordinary high gain PNP
transistor should be selected for Q5 so as to allow a lower
collector-emitter saturation voltage).
PG_LDON
0.4V
-
+
LDO_OFF
FBN
V REF
R N2
20k ?
0.1μF
For the EL7585, the minimum drive current is:
I_DRVL_min = 8mA
1: Nn
R N1
V OFF (TO -20V)
The minimum base-emitter resistor, R BL , can now be
calculated as:
-
+
GMN
36V
DRVN
R BN
3k ?
Q2
C OFF
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
ESD
CLAMP
FIGURE 22. V OFF FUNCTIONAL BLOCK DIAGRAM
current, however, regulation may be adversely affected, by
supply noise if R BL is made too high in value.
0.9V
LDO_LOG
V IN OR V PROT
(3V TO 6V)
V LOGIC
0.9V
PG_LDOP
+
-
LDO_ON
36V
ESD
CLAMP
R BP
7k ?
DRVP
V BOOST LX
0.1μF
CP (TO 36V)
0.1μF
Q3
V ON (TO 35V)
PG_LDOL
+
-
-
+
GML
R BL
500 ?
DRVL
FBL
R L1
R L2
20k ?
Q5
(1.3V TO 3.6V)
C LOG
10μF
+
FBP
R P1
R P2
20k ?
C ON
1: N1
-
GMP
1: Np
FIGURE 21. V ON FUNCTIONAL BLOCK DIAGRAM
12
FIGURE 23. 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
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 EL7585 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
FN7345.2
March 9, 2006
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PDF描述 |
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| EL7586ILZ | IC POWER SUPPLY TFT-LCD 20-QFN |
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| EL7642ILTZ | IC BOOST REG DC/DC TFT-LCD 32QFN |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7586 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7586_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7586A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD Power Supply |
| EL7586AILZ | 功能描述:直流/直流开关调节器 EL7586AILZ TFT-LCD PWR SUPY RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| EL7586AILZ-T13 | 功能描述:直流/直流开关调节器 EL7586AILZ TFT-LCD P PWR SUPY RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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