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UC1847L883B датащи(PDF) 1 Page - Texas Instruments

номер детали UC1847L883B
подробное описание детали  Current Mode PWM Controller
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC1847L883B датащи(HTML) 1 Page - Texas Instruments

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VREF
RT
CT
+E/A
-E/A
COMP
SH-DN
GND
VIN
VC
AOUT
C/S+
BOUT
C/S-
CS/SS
UCX846
VIN
100µF
2
9
8
5
6
7
16
12
1
3
14
4
11
13
15
.1µ
F
.005µF
.5k
3.2k
3.2k
68k
.0015
3.6k
1k
1.5k
VREF
2N4150
180Ÿ
2W
.05µF
68Ÿ
.05µF
68Ÿ
1k
1k
2N4150
.5Q
1N4245
1N4245
1N4245
UES1402
UES1402
200µH
300µF
VO
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
UC1846, UC1847, UC2846
UC2847, UC3846, UC3847
SLUS352C – JANUARY 1997 – REVISED DECEMBER 2015
UCx846/7 Current Mode PWM Controller
1 Features
3 Description
The UC1846/7 family of control devices provides all
1
Automatic Feedforward Compensation
of
the
necessary
features
to
implement
fixed-
Programmable Pulse-by-Pulse Current Limiting
frequency,
current-mode
control
schemes
while
Automatic Symmetry Correction in Push-Pull
maintaining a minimum external parts count. The
Configuration
superior performance of this technique can be
measured in improved line regulation, enhanced load
Enhanced Load Response Characteristics
response characteristics, and a simpler, easier-to-
Parallel Operation Capability for Modular Power
design control loop. Topological advantages include
Systems
inherent pulse-by-pulse current limiting capability,
Differential Current Sense Amplifier with Wide
automatic
symmetry
correction
for
push-pull
Common Mode Range
converters, and the ability to parallel power modules
while maintaining equal current sharing.
Double-Pulse Suppression
Protection circuitry includes built-in undervoltage
500-mA (Peak) Totem-pole Outputs
lockout and programmable current limit, in addition to
±1% Band Gap Reference
soft-start capability. A shutdown function is also
Undervoltage Lockout
available,
which
can
initiate
either
a
complete
Soft-Start Capability
shutdown with automatic restart or latch the supply
off.
Shutdown Terminal
500-kHz Operation
Other features include fully-latched operation, double-
pulse suppression, deadline adjust capability, and a
±1% trimmed band gap reference.
2 Applications
The UC1846 features low outputs in the OFF state,
Telecommunication Power Converters
while the UCx847 features high outputs in the OFF
Industrial Power Converters
state.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LCCC (20)
8.89 mm × 8.89 mm
UC1846
CDIP (16)
6.92 mm × 19.56 mm
PLCC (20)
8.96 mm × 8.96 mm
UC2846, UC3846
SOIC (16)
7.5 mm × 10.3 mm
PDIP (16)
6.35 mm × 19.3 mm
SOIC (16)
7.5 mm × 10.3 mm
UC2847, UC3847
PDIP (16)
6.35 mm × 19.3 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Block Diagram
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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