PWM. UCC3808-1 Datasheet

UCC3808-1 Datasheet PDF


Part

UCC3808-1

Description

Low Power Current Mode Push-Pull PWM

Manufacture

etcTI

Page 22 Pages
Datasheet
Download UCC3808-1 Datasheet


UCC3808-1 Datasheet
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2
SLUS168E – APR 1999 – REVISED AUGUST 2015
UCCx808-x Low Power Current Mode Push-Pull PWM
1 Features
1 Dual Output Drive Stages in Push-Pull
Configuration
• 130-μA Typical Starting Current
• 1-mA Typical Run Current
• Operation to 1-MHz
• Internal Soft-Start
• On-Chip Error Amplifier With 2-MHz Gain
Bandwidth Product
• On-Chip VDD Clamping
• Output Drive Stages Capable Of 500-mA Peak
Source Current, 1-A Peak Sink Current
2 Applications
• Server and Desktop Power Supplies
• Telecom Power Supplies
• DC-DC Converters
• Switched-Mode Power Supplies
3 Description
The UCCx808-x is a family of BiCMOS push-pull,
high-speed, low-power, pulse-width modulators. The
UCCx808 contains all of the control and drive circuitry
required for offline or DC-to-DC fixed frequency
current-mode switching power supplies with minimal
external parts count.
The UCCx808-x dual output drive stages are
arranged in a push-pull configuration. Both outputs
switch at half the oscillator frequency using a toggle
flip-flop. The dead time between the two outputs is
typically 60 ns to 200 ns depending on the values of
the timing capacitor and resistors, thus limiting each
output stage duty cycle to less than 50%.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC2808-1
UCC2808-2
UCC3808-1
UCC3808-2
SOIC (8)
PDIP (8)
4.90 mm × 3.91 mm
9.81 mm × 6.35 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
+
VIN
36 V TO 72 V
Simplified Schematic
ER28 32CTQ030
8:2
NP2 NS1 EF25 7µH
4700 µF
0.47 µF
51 kΩ
1/4 W
BYV
28–200 62 Ω
1000 pF
IRF640
62 Ω
BYV
28–200
1000 pF
IRF640
NP1 NS2
12
680 µF
0.01 µF
LOOP B
VO
5 V 50 W
+
COMP
LOOP A
4700 pF 20 kΩ
200 Ω
19.1 kΩ
2.2 Ω
10 Ω
2.2 Ω 1 mH
DF02SGICT
10 µF
0.1 µF
2 kΩ
0.2 Ω
330 pF
20 kΩ
VDD OUTA OUTB GND
8765
UCC3808D-1
PRIMARY
GROUND
1234
COMP FB CS RC
RC
4.99 kΩ
2.80 kΩ
CURRENT
86.6 kΩ SENSE
2N2907
4.99 kΩ
20 kΩ
330 pF 432 Ω
0.1 µF
240 Ω
H11A1
4 U3 3
52
0.1 µF 6
1
0.01 µF
1 kV
470 pF
3 1 TL431
2
19.1 kΩ
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.

UCC3808-1 Datasheet
UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2
SLUS168E – APR 1999 – REVISED AUGUST 2015
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......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Electrical Characteristics........................................... 4
6.5 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 7
7.1 Overview ................................................................... 7
7.2 Functional Block Diagram ......................................... 7
7.3 Feature Description................................................... 8
7.4 Device Functional Modes.......................................... 9
8 Application and Implementation ........................ 10
8.1 Application Information............................................ 10
8.2 Typical Application ................................................. 10
9 Power Supply Recommendations...................... 11
10 Layout................................................................... 12
10.1 Layout Guidelines ................................................. 12
10.2 Layout Example .................................................... 12
11 Device and Documentation Support ................. 13
11.1 Related Links ........................................................ 13
11.2 Documentation Support ....................................... 13
11.3 Community Resources.......................................... 13
11.4 Trademarks ........................................................... 13
11.5 Electrostatic Discharge Caution ............................ 13
11.6 Glossary ................................................................ 13
12 Mechanical, Packaging, and Orderable
Information ........................................................... 13
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (August 2002) to Revision E
Page
• Removed references to the TSSOP packaging .................................................................................................................... 1
• 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
2 Submit Documentation Feedback
Copyright © 1999–2015, Texas Instruments Incorporated
Product Folder Links: UCC2808-1 UCC2808-2 UCC3808-1 UCC3808-2


Features Datasheet pdf Product Folder Sample & Buy Technical Documents Tools & Software Support & Community UCC2808-1, UCC2808-2, UCC380 8-1, UCC3808-2 SLUS168E – APR 1999 REVISED AUGUST 2015 UCCx808-x Low Pow er Current Mode Push-Pull PWM 1 Featur es •1 Dual Output Drive Stages in Pus h-Pull Configuration • 130-μA Typica l Starting Current • 1-mA Typical Run Current • Operation to 1-MHz • Int ernal Soft-Start • On-Chip Error Ampl ifier With 2-MHz Gain Bandwidth Product • On-Chip VDD Clamping • Output Dr ive Stages Capable Of 500-mA Peak Sourc e Current, 1-A Peak Sink Current 2 Appl ications • Server and Desktop Power S upplies • Telecom Power Supplies • DC-DC Converters • Switched-Mode Powe r Supplies 3 Description The UCCx808-x is a family of BiCMOS push-pull, high- speed, low-power, pulse-width modulator s. The UCCx808 contains all of the cont rol and drive circuitry required for of fline or DC-to-DC fixed frequency curre nt-mode switching power supplies with minimal external parts count. The UCCx808-x dual outpu.
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