參數(shù)資料
型號(hào)： UC2845AAY
廠商： Microsemi Corporation
英文描述： CURRENT MODE PWM CONTROLLER
中文描述： 電流模式PWM控制器
文件頁數(shù)： 1/8頁
文件大?。?/td> 242K
代理商： UC2845AAY
D E S C R I P T I O N
K E Y F E AT U R E S
I
LOW START-UP CURRENT.
(0.5mA max.)
I
TRIMMED OSCILLATOR DISCHARGE
CURRENT.
(See Product Highlight)
p
OPTIMIZED FOR OFF-LINE AND DC-TO-DC
CONVERTERS.
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.
p
INTERNALLY TRIMMED BANDGAP
REFERENCE.
p
500KHz OPERATION.
p
LOW R
O
ERROR AMPLIFIER.
The UC184xA family of control ICs
provides all the necessary features to
implement off-line fixed-frequency,
current-mode switching power supplies
with a minimum of external compo-
nents. The current mode architecture
demonstrates improved load regulation,
pulse-by-pulse current limiting and
inherent protection of the power supply
output switch. The IC includes: A
bandgap reference trimmed to ±1%
accuracy, an error amplifier, a current
sense comparator with internal clamp to
1V, a high current totem pole output
stage for fast switching of power
MOSFET's, and an externally program-
mable oscillator to set frequency and
maximum duty cycle. The under-
voltage lock-out is designed to operate
with 250μA typ. start-up current,
allowing an efficient bootstrap supply
voltage design. Available options for
this family of products, such as start-up
voltage hysteresis and duty cycle, are
summarized below in the Available
Options section. The UC184xA family
of control ICs is also available in 14-pin
SOIC package which makes the Power
Output Stage Collector and Ground pins
available.
A P P L I C AT I O N S
I
ECONOMICAL OFF-LINE FLYBACK OR
FORWARD CONVERTERS.
I
DC-DC BUCK OR BOOST CONVERTERS.
I
LOW COST DC MOTOR CONTROL.
A
V A I L A B L E
O
P T I O N S
Part #
Start-Up Hysteresis Max. Duty
Voltage
UCx842A
16V
Cycle
<100%
PA C K A G E O R D E R I N F O R M AT I O N
Plastic DIP
8-pin
UC384xAM
UC384xADM
UC284xAM
UC284xADM
—
—
T
A
(°C)
0 to 70
-40 to 85
-55 to 125
UC384xAD
UC284xAD
—
—
UC284xAY
UC184xAY
M
Plastic SOIC
8-pin
DM
Plastic SOIC
14-pin
D
Ceramic DIP
8-pin
Y
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)
6V
UCx843A
8.4V
0.8V
<100%
UCx844A
16V
6V
<50%
UCx845A
8.4V
0.8V
<50%
P R O D U C T H I G H L I G H T
C
OMPARISON
OF
UC384
X
A
VS
. SG384
X
D
ISCHARGE
C
URRENT
UC384xA
7.5
8.3
Mean
9.3
SG384x
Min. Limit
7.8
3σ
8.8
+3σ
SG384x
Max. Limit
Discharge Current Distribution - mA
T
A
=25°C
C
U R R E N T
M
O D E
PWM C
O N T R O L L E R
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
Copyright 1995
Rev. 1.2 12/95
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
UC184xA/284xA/384xA
LIN D
OC
#: 1840
1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UC2845AD 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC2845AD1 功能描述:電流型 PWM 控制器 0.5mA Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC2845AD1013TR 制造商:STMicroelectronics 功能描述:
UC2845AD8 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC2845AD8G4 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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