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| 型号： | LX1555CDM-TR |
| 厂商： | MICROSEMI CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | ROHS COMPLIANT, PLASTIC, SOIC-8 |
| 文件页数： | 1/18页 |
| 文件大小： | 475K |
| 代理商： | LX1555CDM-TR |
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
P RODU C T ION D AT A S HEET
T HE I NFI N ITE P O W ER OF I N NOVATIO N
L IN F IN IT Y M IC ROEL E C TRON IC S I NC .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
Copyright
1994
Rev. 1.0b,2005-03-01
LX1552/3/4/5
U LTR A -L OW S TAR T -U P C URREN T , C U RRENT -M ODE PWM
DESCRI PTI O N
The LX155x family of ultra-low start-up current
(250A max), current mode control ICs offer new
levels of energy efficiency for offline converter
applications.
They are ideally optimized for
personal computer and CRT power supplies
although they can be used in any number of off-line
applications where energy efficiency is critical.
Coupled with the fact that the LX155x series
requires a minimal set of external components, the
series offers an excellent value for cost conscious
consumer applications.
Optimizing energy efficiency, the LX155x series
demonstrates a significant power reduction as
compared with other similar off-line controllers.
Table 1 compares the SG384x, UC384xA and the
LX155x start-up resistor power dissipation. The
LX155x offers an overall 4X reduction in power
dissipation.
Additionally, the precise oscillator discharge
current
gives
the
power
supply
designer
considerable flexibility in optimizing system duty
cycle consistency.
The current mode architecture demonstrates
improved load regulation, pulse by pulse current
limiting and inherent protection of the power
supply output switch. The LX155x includes a
bandgap reference trimmed to 1%, an error
amplifier, a current sense comparator internally
clamped to 1V, a high current totem pole output
stage for fast switching of power MOSFETs, and
an externally programmable oscillator to set
operating frequency and maximum duty cycle.
The under voltage lock-out circuitry is designed to
operate with as little as 250A of supply current
permitting very efficient bootstrap designs.
IMPORTANT:
For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT H I GHLIGHT
Typical Application of LX155x Using Its MicroPower Start-Up Feature
I ST
RST
V
CC
AC
INPUT
LX1552
or
LX1554
Design Using
SG384x
UC384xA
LX155x
Max. Start-up Current
Specification (IST)
1000A
500A
250A
Typical Start-up Resistor
Value (RST)
62K
124K
248K
Max. Start-up Resistor
Power Dissipation (PR)
2.26W
1.13W
0.56W
Note: Calculation is done for universal AC input
specification of VACMIN = 90VRMS to VACMAX = 256VRMS using
the following equation: (resistor current is selected to be 2
* IST @ VACMIN)
2
ACMIN
AC MAX
ST
R
ST
2V
V
R=
, P =
R
2 I
KEY FEATUR ES
Ultra-Low Start-up Current (150A
Typical)
Trimmed Oscillator Discharge
Current (±2% Typical)
Initial Oscillator Frequency Better
Than ±4%
Output Pulldown During UVLO
Precision 2.5V Reference (±2
maximum)
Current Sense Delay to Output
(150ns Typical)
Automatic Feed Forward
Compensation
Pulse-by-Pulse Current Limiting
Enhanced Load response
Characteristics
Under-Voltage Lockout with
Hysteresis
Double Pulse Suppression
High Current Totem Pole Output
(±1A Peak)
500KHz Operation
APPLI CATI ONS
Economy Off-Line Flyback or
Forward Converters
DC-DC Buck or Boost Converters
Low Cost DC Motor Control
Available Options Per part#
Part #
Start-Up
Voltage
Hysteresis
Max. Duty
Cycle
LX1552
16V
6V
<100%
LX1553
8.4V
0.8V
<100%
LX1554
16V
6V
<50%
LX1555
8.4V
0.8V
<50%
PACKAGE ORDER INFO
M
Plastic DIP
8-Pin
DM
Plastic SOIC
8-Pin
D
Plastic SOIC
14-Pin
Y
Ceramic DIP
8-Pin
PW
Plastic TSSOP
20-Pin
TA (°C)
RoHS Compliant / Pb-free
Transition DC: 0503
RoHS Compliant / Pb-free
Transition DC: 0440
RoHS Compliant / Pb-free
Transition DC: 0440
RoHS Compliant / Pb-free
Transition DC: 0442
0 to 70
LX155xCM
LX155xCDM
LX155xCD
-
LX155xCPW
-40 to 85
LX155xIM
LX155xIDM
LX155xID
-
-55 to 125
-
LX155xMY
-
Note: Available in Tape & Reel. Append the letters “TR” to the part number (i.e. LX1552CDM-TR).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LX1555CM | 功能描述:IC REG CTRLR BST FLYBK ISO 8-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LX1555CPW | 功能描述:IC REG CTRLR PWM CM 20-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LX1555ID | 功能描述:IC REG CTRLR PWM CM 14-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LX1555IDM | 功能描述:IC REG CTRLR BST FLYBK ISO 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LX1555IM | 功能描述:IC REG CTRLR BST FLYBK ISO 8-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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