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參數(shù)資料
| 型號： | LX1555 |
| 廠商： | Microsemi Corporation |
| 英文描述： | Neo 5.00mm TB plug S87 Sty 05 ckt 02 |
| 中文描述： | 超低啟動電流，電流模式PWM |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 378K |
| 代理商： | LX1555 |
Copyright 1994
Rev. 1.0a 1/01
F O R F U RT 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
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841
1
U
LTRA
-L
OW
S
TART
-U
P
C
URRENT
, C
URRENT
-M
ODE
PWM
P
R O D U C T I O N
D
A T A
S
H E E T
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O V A T I O N
LX1552/3/4/5
LIN D
OC
#: 1552
D E S C R I P T I O N
K E Y F E AT U R E S
I
ULTRA-LOW START-UP CURRENT
(150μA typ.)
I
TRIMMED OSCILLATOR DISCHARGE
CURRENT
(±2% typ.)
I
INITIAL OSCILLATOR FREQUENCY BETTER
THAN ±4%
I
OUTPUT PULLDOWN DURING UVLO
I
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
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.
P R O D U C T H I G H L I G H T
PA C K A G E O R D E R I N F O R MAT I O N
Plastic SOIC
8-pin
D
T
A
(°C)
Plastic DIP
8-pin
LX155xCM
LX155xIM
—
0 to 70
-40 to 85
-55 to 125
LX155xCDM
LX155xIDM
—
LX155xCD
LX155xID
—
—
—
LX155xCPW
—
—
LX155xMY
M
DM
Plastic SOIC
14-pin
Ceramic DIP
8-pin
Y
TSSOP
20-pin
PW
T
YPICAL
A
PPLICATION
OF
LX155X U
SING
I
TS
M
ICRO
P
OWER
S
TART
-U
P
F
EATURE
Max. Start-up Current
Specification (I
ST
)
Typical Start-Up
Resistor Value (R
ST
)
Max. Start-Up Resistor
Power Dissipation (P
R
)
Note: Calculation is done for universal AC input speci-
fication of V
= 90V
to V
= 265V
using the
following equation:
(Resistor current is selected to be
2 * I
ST
at V
ACMIN
.)
V
AC MIN
√
2 * I
ST
Design Using
SG384x UC384xA LX155x
1000μA
500μA
250μA
2.26W
1.13W
0.56W
62K
124K
248K
R
ST
=
, P
R
=
2V
AC
2
MAX
R
ST
T
A B L E
1
A P P L I C AT I O N S
I
ECONOMY OFF-LINE FLYBACK OR
FORWARD CONVERTERS
I
DC-DC BUCK OR BOOST CONVERTERS
I
LOW COST DC MOTOR CONTROL
A
VA I L A B L E
O
P T I O N S
P E R
P
A RT
#
Part #
Start-Up Hysteresis Max. Duty
Voltage
16V
6V
Cycle
<100%
LX1552
LX1553
8.4V
0.8V
<100%
LX1554
16V
6V
<50%
LX1555
8.4V
0.8V
<50%
I
ST
R
ST
V
CC
AC
INPUT
LX1552
or
LX1554
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1552CDMT)
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| LX1555CD | 功能描述:IC REG CTRLR PWM CM 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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| LX1555CM | 功能描述:IC REG CTRLR BST FLYBK ISO 8-DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LX1555CPW | 功能描述:IC REG CTRLR PWM CM 20-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LX1555ID | 功能描述:IC REG CTRLR PWM CM 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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