UC1846-EP PWM controller Datasheet

UC1846-EP Datasheet, PDF, Equivalent


Part Number

UC1846-EP

Description

current-mode PWM controller

Manufacture

etcTI

Total Page 20 Pages
Datasheet
Download UC1846-EP Datasheet


UC1846-EP
www.ti.com
FEATURES
Controlled Baseline
– One Assembly/Test Site, One Fabrication
Site
Extended Temperature Performance of –55°C
to 125°C
Enhanced Diminishing Manufacturing
Sources (DMS) Support
Enhanced Product-Change Notification
Qualification Pedigree (1)
Automatic Feed-Forward Compensation
Programmable Pulse-by-Pulse Current
Limiting
Automatic Symmetry Correction in Push-Pull
Configuration
Enhanced Load-Response Characteristics
Parallel Operation Capability for Modular
Power Systems
Differential Current-Sense Amplifier With
Wide Common-Mode Range
Double Pulse Suppression
500-mA (Peak) Totem-Pole Outputs
• ±1% Bandgap Reference
Undervoltage Lockout
(1) Component qualification in accordance with JEDEC and
industry standards to ensure reliable operation over an
extended temperature range. This includes, but is not limited
to, Highly Accelerated Stress Test (HAST) or biased 85/85,
temperature cycle, autoclave or unbiased HAST,
electromigration, bond intermetallic life, and mold compound
life. Such qualification testing should not be viewed as
justifying use of this component beyond specified
performance and environmental limits.
UC1846-EP
CURRENT-MODE PWM CONTROLLER
SGLS329 – MAY 2006
Soft-Start Capability
Shutdown Terminal
500-kHz Operation
DW PACKAGE
(TOP VIEW)
C/S SS
VREF
C/S–
C/S+
E/A+
E/A–
COMP
CT
Shutdown
VIN
B Out
VC
GND
A Out
Sync
RT
DESCRIPTION/ORDERING INFORMATION
The UC1846-EP control IC provides all of the necessary features to implement fixed-frequency, current-mode
control schemes, while maintaining a minimum external parts count. The superior performance of this technique
can be measured in improved line regulation, enhanced load-response characteristics, and a simpler,
easier-to-design control loop. Topological advantages include inherent pulse-by-pulse current-limiting capability,
automatic symmetry correction for push-pull converters, and the ability to parallel power modules, while
maintaining equal current sharing.
Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition to soft-start
capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic
restart or latch the supply off.
Other features include fully latched operation, double pulse suppression, deadline adjust capability, and a ±1%
trimmed bandgap reference.
The UC1846-EP features low outputs in the OFF state.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006, Texas Instruments Incorporated

UC1846-EP
UC1846-EP
CURRENT-MODE PWM CONTROLLER
SGLS329 – MAY 2006
ORDERING INFORMATION
TA
–55°C to 125°C
PACKAGE
SOIC – DW
ORDERABLE PART NUMBER
UC1846MDWREP
BLOCK DIAGRAM
www.ti.com
TOP-SIDE MARKING
UC1846MEP
VIN 15
Sync 10
RT 9
CT 8
C/S− 3
C/S+ 4
NI 5
INV 6
OSC
COMP
X3
0.5 V
+
E/A
5.1-V
Reference
Regulator
UVLO
Lockout
SR
Q
S
0.5 mA
COMP 7
F/F
Q
T
Q
2 VREF
13 VC
11 A Out
Output
Stage
14 B Out
12 GND
1
Current-
Limit Adjust
16 Shutdown
350 mV 6k
UDG−02057
2 Submit Documentation Feedback


Features www.ti.com FEATURES • Controlled Basel ine – One Assembly/Test Site, One Fab rication Site • Extended Temperature Performance of –55°C to 125°C • E nhanced Diminishing Manufacturing Sourc es (DMS) Support • Enhanced Product-C hange Notification • Qualification Pe digree (1) • Automatic Feed-Forward C ompensation • Programmable Pulse-by-P ulse Current Limiting • Automatic Sym metry Correction in Push-Pull Configura tion • Enhanced Load-Response Charact eristics • Parallel Operation Capabil ity for Modular Power Systems • Diffe rential Current-Sense Amplifier With Wi de Common-Mode Range • Double Pulse S uppression • 500-mA (Peak) Totem-Pole Outputs • ±1% Bandgap Reference • Undervoltage Lockout (1) Component qua lification in accordance with JEDEC and industry standards to ensure reliable operation over an extended temperature range. This includes, but is not limite d to, Highly Accelerated Stress Test (H AST) or biased 85/85, temperature cycle, autoclave or unbiased HAST, electromigration, bond intermet.
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