PWM. UCC2808A-2Q1 Datasheet

UCC2808A-2Q1 Datasheet PDF


Part

UCC2808A-2Q1

Description

Low Power Current Mode Push-Pull PWM

Manufacture

etcTI

Page 18 Pages
Datasheet
Download UCC2808A-2Q1 Datasheet


UCC2808A-2Q1 Datasheet
UCC2808A-1Q1
UCC2808A-2Q1
www.ti.com
SGLS183B – AUGUST 2003 – REVISED JULY 2012
Low Power Current Mode Push-Pull PWM
Check for Samples: UCC2808A-1Q1 , UCC2808A-2Q1
FEATURES
1
• Qualified for Automotive Applications
• ESD Protection Exceeds 1500 V Per MIL-STD-
883, Method 3015; Exceeds 200 V Using
Machine Model (C = 200 pF, R = 0)
• 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
D PACKAGE
(TOP VIEW)
COMP
FB
CS
RC
1
2
3
4
8 VDD
7 OUTA
6 OUTB
5 GND
OUTA
VDD
COMP
FB
PW PACKAGE
(TOP VIEW)
18
27
36
45
OUTB
GND
RC
CS
DESCRIPTION
The UCC2808A-xQ1 is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The
UCC2808A-xQ1 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 UCC2808A-xQ1 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 UCC2808A-xQ1 family offers a variety of package options and choice of undervoltage lockout levels. The
family has UVLO thresholds and hysteresis options for off-line and battery powered systems. Thresholds are
shown in the ordering information table.
The UCC2808A-xQ1 is an enhanced version of the UCC2808 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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2012, Texas Instruments Incorporated

UCC2808A-2Q1 Datasheet
UCC2808A-1Q1
UCC2808A-2Q1
SGLS183B – AUGUST 2003 – REVISED JULY 2012
www.ti.com
TA UVLO OPTION
–40°C to 125°C
12.5 V/8.3 V
–40°C to 125°C
4.3 V/4.1 V
ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART
NUMBER
SOIC (D)
TSSOP (PW)
Tape and reel
Tape and reel
UCC2808AQDR-1Q1
UCC2808AQPWR1Q1 (3)
SOIC (D)
TSSOP (PW)
Tape and reel
Tape and reel
UCC2808AQDR-2Q1
UCC2808AQPWR2Q1 (3)
TOP-SIDE MARKING
2D08-1
2808A1
2D08-2
2808A2
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(3) Product Preview.
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
Block Diagram
FB COMP CS
2 13
OVERCURRENT
COMPARATOR
VDD OK
VDD−1 V
0.5 V
22 k Ω
0.75 V
2.0 V
2.2 V
S
Q
R
S
Q
R
VDD
VOLTAGE
REFERENCE
SOFT START
SLOPE = 1 V/ms
PEAK CURRENT
COMPARATOR
0.5 V
OSCILLATOR
1.2R
PWM
COMPARATOR
R
14 V
PWM
LATCH
S
Q
R
Q
T
Q
8 VDD
7 OUTA
6 OUTB
5 GND
A. Pinout shown is for SOIC package. TSSOP pinout is different.
4
RC
UDG-00097
2 Copyright © 2003–2012, Texas Instruments Incorporated


Features Datasheet pdf UCC2808A-1Q1 UCC2808A-2Q1 www.ti.com S GLS183B – AUGUST 2003 – REVISED JUL Y 2012 Low Power Current Mode Push-Pul l PWM Check for Samples: UCC2808A-1Q1 , UCC2808A-2Q1 FEATURES 1 • Qualified for Automotive Applications • ESD Pr otection Exceeds 1500 V Per MIL-STD- 88 3, Method 3015; Exceeds 200 V Using Mac hine Model (C = 200 pF, R = 0) • Dual Output Drive Stages in Push-Pull Confi guration • Current Sense Discharge Tr ansistor 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 B andwidth Product • On Chip VDD Clampi ng • Output Drive Stages Capable of 5 00-mA PeakSource Current, 1-A Peak-Sink Current D PACKAGE (TOP VIEW) COMP FB CS RC 1 2 3 4 8 VDD 7 OUTA 6 OUTB 5 GND OUTA VDD COMP FB PW PACKAGE (TOP VIEW) 18 27 36 45 OUTB GND RC CS DESC RIPTION The UCC2808A-xQ1 is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC2808A-xQ1 contain.
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