900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






etcTI

UCC38C44 Datasheet Preview

UCC38C44 Datasheet

BiCMOS Low-Power Current-Mode PWM Controller

No Preview Available !

Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45
UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45
SLUS458G – JULY 2000 – REVISED JANUARY 2017
UCCx8C4x BiCMOS Low-Power Current-Mode PWM Controller
1 Features
1 Enhanced Replacement for UCx84x and
UCx84xA Family With Pin-to-Pin Compatibility
• 1-MHz Operation
• 50-µA Standby Current, 100-µA Maximum
• Low Operating Current of 2.3 mA at 52 kHz
• Fast 35-ns Cycle-by-Cycle Over-Current Limiting
• ±1-A Peak Output Current
• Rail-to-Rail Output Swings with 25-ns Rise and
20-ns Fall Times
• ±1% Initial Trimmed 2.5-V Error Amplifier
Reference
• Trimmed Oscillator Discharge Current
• New Undervoltage Lockout Versions
• VSSOP-8 Package Minimizes Board Space
2 Applications
• Switch-Mode Power Supplies
• General Purpose DC-DC or Off-Line Isolated
Power Converters
• Board Mount Power Modules
3 Description
UCCx8C4x family are high-performance, current-
mode PWM controllers. The UCCx8C4x is an
enhanced BiCMOS version with pin-for-pin
compatibility to the industry standard UCx84xA family
and UCx84x family of PWM controllers. The BiCMOS
technology offers lower power consumption to
improve efficiency as well as faster current sense and
oscillator frequency. In addition, lower startup voltage
versions of 7 V are offered as UCCx8C40 and
UCCx8C41 for use in battery systems. The
UCC28C4x series is specified for operation from
–40°C to 105°C, and the UCC38C4x series is
specified for operation from 0°C to 70°C.
Providing necessary features to control fixed
frequency, peak current-mode power supplies, this
family offers the following performance advantages.
The device offers high-frequency operation up to 1
MHz, suitable for high speed applications. The
trimmed discharge current enables more precise
programming of the maximum duty cycle and dead-
time limit when compared to the UCx84x family.
Reduced start-up and operating currents minimizes
start-up loss and low operating power consumption
for improved efficiency. The device also features a
fast current-sense-to-output delay time of 35 ns for
superior overload protection at the power switch, and
a ±1-A peak output current capability with improved
rise and fall times for driving large external MOSFETs
directly.
The UCC38C4x family is offered in 8-pin VSSOP
(DGK), 8-pin SOIC (D), and 8-pin PDIP (P) packages.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC28C4x,
UCC38C4x
SOIC (8)
PDIP (8)
VSSOP (8)
3.91 mm × 4.90 mm
6.35 mm × 9.81 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VIN VOUT
VDD
OUT
VREF
CS
UCC28C43
RT/CT
FB
GND
COMP
Copyright © 2016, Texas Instruments Incorporated
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.




etcTI

UCC38C44 Datasheet Preview

UCC38C44 Datasheet

BiCMOS Low-Power Current-Mode PWM Controller

No Preview Available !

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45
UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45
SLUS458G – JULY 2000 – REVISED JANUARY 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 5
7.6 Typical Characteristics .............................................. 7
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagram ....................................... 12
8.3 Feature Description................................................. 12
8.4 Device Functional Modes........................................ 21
9 Application and Implementation ........................ 22
9.1 Application Information............................................ 22
9.2 Typical Application .................................................. 24
10 Power Supply Recommendations ..................... 35
11 Layout................................................................... 35
11.1 Layout Guidelines ................................................. 35
11.2 Layout Example .................................................... 37
12 Device and Documentation Support ................. 38
12.1 Device Support...................................................... 38
12.2 Documentation Support ........................................ 38
12.3 Related Links ........................................................ 38
12.4 Receiving Notification of Documentation Updates 38
12.5 Community Resources.......................................... 38
12.6 Trademarks ........................................................... 39
12.7 Electrostatic Discharge Caution ............................ 39
12.8 Glossary ................................................................ 39
13 Mechanical, Packaging, and Orderable
Information ........................................................... 39
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision F (August 2016) to Revision G
Page
• Changed VREFLECTED equation. ............................................................................................................................................. 26
• Changed DMAX equation. ..................................................................................................................................................... 26
Changes from Revision E (October 2010) to Revision F
Page
• Added Device Information table, Pin Configuration and Functions section, Specifications section, ESD Ratings table,
Detailed Description section, Application and Implementation section, Power Supply Recommendations section,
Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information
section .................................................................................................................................................................................... 1
• Added Thermal Information table ........................................................................................................................................... 5
Changes from Revision D (December 2006) to Revision E
Page
• Updated Available Options Table heading from TA to TA = TJ ............................................................................................... 3
• Updated Operating Junction Temperature in the Recommended Operating Conditions Table, from –55 to 150 to –40
to 105...................................................................................................................................................................................... 4
2 Submit Documentation Feedback
Copyright © 2000–2017, Texas Instruments Incorporated
Product Folder Links: UCC28C40 UCC28C41 UCC28C42 UCC28C43 UCC28C44 UCC28C45 UCC38C40
UCC38C41 UCC38C42 UCC38C43 UCC38C44 UCC38C45


Part Number UCC38C44
Description BiCMOS Low-Power Current-Mode PWM Controller
Maker etcTI
PDF Download

UCC38C44 Datasheet PDF






Similar Datasheet

1 UCC38C40 BiCMOS Low-Power Current-Mode PWM Controller
etcTI
2 UCC38C41 BiCMOS Low-Power Current-Mode PWM Controller
etcTI
3 UCC38C42 BiCMOS Low-Power Current-Mode PWM Controller
etcTI
4 UCC38C43 BiCMOS Low-Power Current-Mode PWM Controller
etcTI
5 UCC38C44 BiCMOS Low-Power Current-Mode PWM Controller
etcTI
6 UCC38C45 BiCMOS Low-Power Current-Mode PWM Controller
etcTI





Part Number Start With

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



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy