UCC2808A-2 Datasheet PDF


Part Number

UCC2808A-2

Description

Low-Power Current-Mode Push-Pull PWM

Manufacture

etcTI

Total Page 22 Pages
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Download UCC2808A-2 Datasheet PDF


Features Datasheet pdf Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity Reference Design UCC2808A-1, U CC2808A-2, UCC3808A-1, UCC3808A-2 SLUS4 56F – APRIL 1999 – REVISED JULY 201 8 UCCx808A Low-Power Current-Mode Push- Pull PWM 1 Features •1 Dual-Output D rive Stages in Push-Pull Configuration • Current-Sense Discharge Transistor to Improve Dynamic Response • 130-μA Typical Starting Current • 1-mA Typi cal Run Current • Operation to 1 MHz • Internal Soft Start • On-Chip Err or Amplifier With 2-MHz Gain Bandwidth Product • On-Chip VDD Clamping • Ou tput Drive Stages Capable of 500-mA Pea k- Source Current, 1-A Peak-Sink Curren t 2 Applications • High-Efficiency Switch-Mode Power Suppli.
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UCC2808A-2 Datasheet
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
UCC2808A-1, UCC2808A-2, UCC3808A-1, UCC3808A-2
SLUS456F – APRIL 1999 – REVISED JULY 2018
UCCx808A Low-Power Current-Mode Push-Pull PWM
1 Features
1 Dual-Output Drive Stages in Push-Pull
Configuration
• Current-Sense Discharge Transistor to Improve
Dynamic Response
• 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
• High-Efficiency Switch-Mode Power Supplies
• Telecom DC-to-DC Converters
• Point-of-Load Power Modules
• Low-Cost Push-Pull and Half-Bridge Applications
3 Description
The UCCx808A devices are a family of BiCMOS
push-pull, high-speed, low-power, pulse-width
modulators. The UCCx808A contains all of the control
and drive circuitry required for off-line or DC-to-DC
fixed frequency current-mode switching power
supplies with minimal external parts count.
The UCCx808A 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%.
The UCCx808A family offers a variety of package
options, temperature range options, and choice of
undervoltage lockout levels. The family has UVLO
thresholds and hysteresis options for off-line and
battery-powered systems.
The UCCx808A is an enhanced version of the
UCC3808 family. The significant difference is that the
A versions feature an internal discharge transistor
from the CS pin to ground, which is activated each
clock cycle during the oscillator dead time. The
feature discharges any filter capacitance on the CS
pin during each cycle and helps minimize filter
capacitor values and current sense delay.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
UCC2808A-1,
UCC2808A-2,
UCC3808A-2
SOIC (8)
PDIP (8)
TSSOP (8)
4.90 mm × 3.91 mm
9.81 mm × 6.35 mm
3.00 mm × 4.40 mm
UCC3808A-1
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.
Simplified Application
VIN UCCx808A
VDD
OUTA
RC OUTB
COMP
CS
FB GND
VOUT
Isolated
Feedback
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.




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