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UCC28221 Datasheet Preview

UCC28221 Datasheet

Dual PWM Controller

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UCC28220, UCC28221
SLUS544G – SEPTEMBER 2003 – REVISED APRIL 2017
UCC2822x Interleaved Dual PWM Controller With Programmable Max Duty Cycle
1 Features
1 2-MHz High-Frequency Oscillator With 1-MHz
Operation Per Channel
• Matched Internal Slope Compensation Circuits
• Programmable Maximum Duty Cycle Clamp 60%
to 90% Per Channel
• Peak Current Mode Control With Cycle-by-Cycle
Current Limit
• Current Sense Discharge Transistor for Improved
Noise Immunity
• Accurate Line Undervoltage and Overvoltage
Sense With Programmable Hysteresis
• Opto-Coupler Interface
• 110-V Internal Start-Up JFET (UCC28221)
• Operates From 12-V Supply (UCC28220)
• Programmable Soft Start
2 Applications
• High Output Current (50-A to 100-A) Converters
• Maximum Power Density Designs
• High-Efficiency 48-V Input With Low Output Ripple
Converters
• High-Power Offline, Telecom, and Datacom
Power Supplies
3 Description
The UCC28220 and UCC28221 are a family of
BiCMOS interleaved dual channel PWM controllers.
Peak current mode control is used to ensure current
sharing between the two channels. A precise
maximum duty cycle clamp can be set to any value
between 60% and 90% duty cycle per channel.
The UCC28220 has an UVLO turnon threshold of
10 V for use in 12-V supplies while UCC28221 has a
turnon threshold of 13 V for systems needing wider
UVLO hysteresis. Both have 8-V turnoff thresholds.
Additional features include a programmable internal
slope compensation with a special circuit which is
used to ensure exactly the same slope is added to
each channel and a high-voltage 110-V internal JFET
for easier start-up for the wider hysteresis UCC28221
version.
The UCC28220 is available in both 16-pin SOIC and
low-profile TSSOP packages. The UCC28221 also
comes in 16-pin SOIC package and a slightly larger
20-pin TSSOP package to allow for high-voltage pin
spacing to meet UL1950 creepage clearance safety
requirements.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC28220,
UCC28221
SOIC (16)
TSSOP (16)
9.00 mm × 3.90 mm
5.00 mm × 4.40 mm
UCC28221
TSSOP (20)
6.50 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
(+48V)
Typical Application
1 LINEOV VIN 16
CS1
2 LINE LINEUV 15
HYS
Bias
3 VDD
REF 14
4 CS1
OUT1 13
1/2 UCC27324
VOUT
5 SLOPE OUT2 12
6 CS2
GND 11
CS2
7 SS
CHG 10
8 CTRL DISCHG 9
1/2 UCC27324
REF
E/A
Copyright © 2016, Texas Instruments Incorporated
Pin 16 is a no connect (NC) on UCC28220 which does not include the JFET option.
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

UCC28221 Datasheet Preview

UCC28221 Datasheet

Dual PWM Controller

No Preview Available !

UCC28220, UCC28221
SLUS544G – SEPTEMBER 2003 – REVISED APRIL 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......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Typical Characteristics .............................................. 8
8 Detailed Description ............................................ 11
8.1 Overview ................................................................. 11
8.2 Functional Block Diagram ....................................... 11
8.3 Feature Description................................................. 12
8.4 Device Functional Modes........................................ 13
9 Application and Implementation ........................ 17
9.1 Application Information............................................ 17
9.2 Typical Application .................................................. 17
10 Power Supply Recommendations ..................... 19
11 Layout................................................................... 20
11.1 Layout Guidelines ................................................. 20
11.2 Layout Example .................................................... 20
12 Device and Documentation Support ................. 21
12.1 Documentation Support ........................................ 21
12.2 Related Links ........................................................ 21
12.3 Receiving Notification of Documentation Updates 21
12.4 Community Resources.......................................... 21
12.5 Trademarks ........................................................... 21
12.6 Electrostatic Discharge Caution ............................ 21
12.7 Glossary ................................................................ 22
13 Mechanical, Packaging, and Orderable
Information ........................................................... 22
4 Revision History
Changes from Revision F (September 2016) to Revision G
Page
• Deleted Control Loop Compensation section. ..................................................................................................................... 19
• Deleted Current Loop section............................................................................................................................................... 19
• Deleted Voltage Loop (TV(s)) section..................................................................................................................................... 19
Changes from Revision E (March 2009) to Revision F
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
• Deleted Ordering Information table; see POA at the end of the data sheet........................................................................... 3
• Added Thermal Information table ........................................................................................................................................... 5
2 Submit Documentation Feedback
Copyright © 2003–2017, Texas Instruments Incorporated
Product Folder Links: UCC28220 UCC28221


Part Number UCC28221
Description Dual PWM Controller
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