EEWORLDEEWORLDEEWORLD

Part Number

Search

LX1555IDT

Description
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO14, PLASTIC, SOIC-14
CategoryPower/power management    The power supply circuit   
File Size382KB,18 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
Environmental Compliance  
Download Datasheet Parametric View All

LX1555IDT Overview

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO14, PLASTIC, SOIC-14

LX1555IDT Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerMicrosemi
Parts packaging codeSOIC
package instructionSOP,
Contacts14
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeCURRENT-MODE
Control TechnologyPULSE WIDTH MODULATION
Maximum input voltage30 V
Minimum input voltage12 V
Nominal input voltage15 V
JESD-30 codeR-PDSO-G14
length8.65 mm
Humidity sensitivity level1
Number of functions1
Number of terminals14
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current1 A
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency500 kHz
Temperature levelINDUSTRIAL
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL
Maximum time at peak reflow temperature40
width3.9 mm
L I N D
O C
# :
1552
LX1552/3/4/5
U
LTRA
-L
OW
S
TART
-U
P
C
URRENT
, C
URRENT
-M
ODE
PWM
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
The LX155X family of ultra-low start-up
current (250µA max.), current mode
control IC's offer new levels of energy
efficiency for offline converter applica-
tions. 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 signifi-
cant 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 dissipa-
tion. 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 com-
parator internally clamped to 1V, a high
current totem pole output stage for fast
switching of power mosfet's, and an
externally programmable oscillator to
set operating frequency and maximum
duty cycle. The undervoltage lock-out
circuitry is designed to operate with as
little as 250µA of supply current
permitting very efficient bootstrap
designs.
K E Y F E AT U R E S
s
ULTRA-LOW START-UP CURRENT
(150µA typ.)
s
TRIMMED OSCILLATOR DISCHARGE
CURRENT
(±2% typ.)
s
INITIAL OSCILLATOR FREQUENCY BETTER
THAN ±4%
s
OUTPUT PULLDOWN DURING UVLO
s
PRECISION 2.5V REFERENCE
(±2% max.)
p
CURRENT SENSE DELAY TO OUTPUT
(150ns typ.)
p
AUTOMATIC FEED FORWARD
COMPENSATION
p
PULSE-BY-PULSE CURRENT LIMITING
p
ENHANCED LOAD RESPONSE
CHARACTERISTICS
p
UNDER-VOLTAGE LOCKOUT WITH
HYSTERESIS
p
DOUBLE PULSE SUPPRESSION
p
HIGH CURRENT TOTEM POLE OUTPUT
(±1Amp peak)
p
500kHz OPERATION
A P P L I C AT I O N S
PRODUCT HIGHLIGHT
s
ECONOMY OFF-LINE FLYBACK OR
FORWARD CONVERTERS
s
DC-DC BUCK OR BOOST CONVERTERS
s
LOW COST DC MOTOR CONTROL
T
YPICAL
A
PPLICATION OF
LX155X U
SING
I
TS
M
ICRO
P
OWER
S
TART
-U
P
F
EATURE
T
ABLE
1
R
ST
Design Using
SG384x UC384xA LX155x
250µA
A
VA I L A B L E
O
P T I O N S
Part #
LX1552
LX1553
LX1554
LX1555
PER
P
A RT
#
AC
INPUT
I
ST
V
CC
Max. Start-up Current
1000µA 500µA
Specification (I
ST
)
Typical Start-Up
Resistor Value (R
ST
)
62KΩ
Start-Up Hysteresis Max. Duty
Voltage
Cycle
16V
8.4V
16V
8.4V
6V
0.8V
6V
0.8V
<100%
<100%
<50%
<50%
124KΩ
248KΩ
LX1552
or
Max. Start-Up Resistor
2.26W 1.13W
0.56W
Power Dissipation (P
R
)
Note: Calculation is done for universal AC input speci-
fication of V
ACMIN
= 90V
RMS
to V
ACMAX
= 265V
RMS
using the
following equation:
(Resistor curr ent is selected to be
2 * I
ST
at V
ACMIN
.)
LX1554
R
ST
=
V
AC MIN
√2
* I
ST
, P
R
=
2V
AC2 MAX
R
ST
PA C K A G E O R D E R I N F O R M AT I O N
T
A
(°C)
0 to 70
-40 to 85
-55 to 125
M
Plastic DIP
8-pin
LX155xCM
LX155xIM
DM
Plastic SOIC
8-pin
LX155xCDM
LX155xIDM
D
Plastic SOIC
14-pin
LX155xCD
LX155xID
Y
Ceramic DIP
8-pin
LX155xMY
PW
TSSOP
20-pin
LX155xCPW
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1552CDMT)
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright © 1994
Rev. 1.0a 1/01
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841
1
When a stone has a wish
A country postman named Chevaler traveled on foot between villages every day. One day, he was tripped by a stone on a rugged mountain road. He stood up, dusted himself off, and prepared to walk again....
ping1125 Talking
Electronic small production circuit diagram: double-button touch lighting
Electronic small production circuit diagram: double-key touch lighting lamp This circuit diagram uses two touch electrodes to replace the on and off control in real life. 1. Circuit working principle ...
yuandayuan6999 DIY/Open Source Hardware
Newbie help!!!!
How should freshly graduated students deal with various circuits that are completely different from those in textbooks? Now I have started working as a PE technician. Sometimes I have to analyze some ...
jaylu Analog electronics
Help 430 simulation software
I installed IAR MPS 430 on my Windows 7 64-bit laptop, but the program cannot be downloaded. Can someone please help me? If you have other simulation software, please send it to [email]1024611960@qq.c...
天南紫风 Microcontroller MCU
Understanding the static electricity problems in the field of microelectronics manufacturing from the perspective of integrated circuit back-end manufacturing (chip packaging and testing)
The problems and analysis and solutions of static electricity in microelectronics manufacturing are all in the numerous tiny details.There are a large number of production processes in microelectronic...
copper_hou Integrated technical exchanges
A Tianqian TQ210v3 development board CortexA8 learning board S5PV210 development board
[b]Tianqian TQ210v3 development board CortexA8 learning board S5PV210 development board with 7-inch capacitive screen. Brand new and unused[/b]...
rookieyou Buy&Sell

EEWorld
subscription
account

EEWorld
service
account

Automotive
development
circle

Robot
development
community

Index Files: 1756  1663  2855  558  487  36  34  58  12  10 
Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Room 1530, 15th Floor, Building B, No. 18 Zhongguancun Street, Haidian District, Beijing Telephone: (010) 82350740 Postal Code: 100190
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved 京ICP证060456号 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号