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UCC1895 Datasheet

Phase-Shift PWM Controller

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UCC1895, UCC2895, UCC3895
SLUS157Q – DECEMBER 1999 – REVISED OCTOBER 2019
UCCx895 BiCMOS Advanced Phase-Shift PWM Controller
1 Features
1 Programmable-output turnon delay
• Adaptive delay set
• Bidirectional oscillator synchronization
• Voltage-mode, peak current-mode, or average
current-mode control
• Programmable soft start, soft stop, and chip
disable via a single pin
• 0% to 100% duty-cycle control
• 7-MHz error amplifier
• Operation to 1 MHz
• Typical 5-mA operating current at 500 kHz
• Very low 150-μA current during UVLO
2 Applications
• Phase-shifted full-bridge converters
• Off-line, telecom, datacom, and servers
• Distributed power architecture
• High-density power modules
3 Description
The UCC3895 is a phase-shift PWM controller that
implements control of a full-bridge power stage by
phase shifting the switching of one half-bridge with
respect to the other. The device allows constant
frequency pulse-width modulation in conjunction with
resonant zero-voltage switching to provide high
efficiency at high frequencies. The part is used either
as a voltage-mode or current-mode controller.
While the UCC3895 maintains the functionality of the
UC3875/6/7/8 family and UC3879, it improves on that
controller family with additional features such as
enhanced control logic, adaptive delay set, and
shutdown capability. Because the device is built using
the BCDMOS process, it operates with dramatically
less supply current than it’s bipolar counterparts. The
UCC3895 operates with a maximum clock frequency
of 1 MHz.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
CDIP (20)
24.20 mm × 6.92 mm
LCCC (20
8.89 mm × 8.89 mm
UCCx895
SOIC (20)
PDIP (20)
12.80 mm × 7.50 mm
24.33 mm × 6.35 mm
TSSOP (20)
6.50 mm × 4.40 mm
PLCC (20)
8.96 mm × 8.96 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Application Diagram
UCC3895
1 EAN
EAP 270
2 EAOUT
SS/DISB 19
3 RAMP
OUTA 18
4 REF
OUTB 17
5 GND
PGND 16
6 SYNC
VDD 15
7 CT
OUTC 14
8 RT
OUTD 13
9 DELAB
CS 12
10 DELCD
ADS 11
Q1
VBIAS
A
B
VOUT
C
VIN
D
Copyright © 2017, 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

UCC1895 Datasheet Preview

UCC1895 Datasheet

Phase-Shift PWM Controller

No Preview Available !

UCC1895, UCC2895, UCC3895
SLUS157Q – DECEMBER 1999 – REVISED OCTOBER 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 6
6.5 Electrical Characteristics........................................... 6
6.6 Typical Characteristics ............................................ 10
7 Detailed Description ............................................ 11
7.1 Overview ................................................................. 11
7.2 Functional Block Diagrams ..................................... 11
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 17
7.5 Programming........................................................... 17
8 Application and Implementation ........................ 20
8.1 Application Information............................................ 20
8.2 Typical Application .................................................. 22
9 Power Supply Recommendations...................... 42
10 Layout................................................................... 42
10.1 Layout Guidelines ................................................. 42
10.2 Layout Example .................................................... 43
11 Device and Documentation Support ................. 44
11.1 Documentation Support ........................................ 44
11.2 Receiving Notification of Documentation Updates 44
11.3 Community Resource............................................ 44
11.4 Trademarks ........................................................... 44
11.5 Electrostatic Discharge Caution ............................ 45
11.6 Glossary ................................................................ 45
12 Mechanical, Packaging, and Orderable
Information ........................................................... 45
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision P (June 2013) to Revision Q
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
• Changed UCC1895 VOL MAX, From 250 mV : To 300 mV in Electrical Characteristics ....................................................... 8
• Changed UCC1895 RAMP sink current MIN, From 12 mA : To 10 mA in Electrical Characteristics .................................... 8
• Changed the FSW note in the Detailed Design Procedure section ...................................................................................... 23
• Changed the voltage drop across the RDS(on) from 0.5-V to 4.5-V forward voltage drop in the output rectifiers.................. 23
• Added Output Voltage Setpoint section................................................................................................................................ 34
• Added Setting the Switching Frequency section .................................................................................................................. 36
• Added Soft Start section....................................................................................................................................................... 36
• Added Setting the Switching Delays section ........................................................................................................................ 36
• Added Setting the Slope Compensation section .................................................................................................................. 38
Changes from Revision O (April 2010) to Revision P
Page
• Added The CS input connects to text to the beginning of the CS Detailed Pin Description. ............................................... 14
• Added second paragraph to detailed REF Pin Description and included the UCC1895 at the end of the first
paragraph to differentiate capacitance capabilities of the devices. ...................................................................................... 16
• Changed UCC3895 Timing Diagram in the Application Information section to reflect the maximum duty cycle conditions 19
Changes from Revision N (May 2009) to Revision O
Page
• Changed REF pin description from “Do not use more than 1.0 μF of total capacitance on this pin.” to “Do not use
more than 4.7 μF of total capacitance on this pin.” .............................................................................................................. 16
2 Submit Documentation Feedback
Copyright © 1999–2019, Texas Instruments Incorporated
Product Folder Links: UCC1895 UCC2895 UCC3895


Part Number UCC1895
Description Phase-Shift PWM Controller
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