IC PWM CURRENT MODE 8SOIC

UCC2808ADTR-1

Manufacturer Part NumberUCC2808ADTR-1
DescriptionIC PWM CURRENT MODE 8SOIC
ManufacturerTexas Instruments
UCC2808ADTR-1 datasheet
 


Specifications of UCC2808ADTR-1

Pwm TypeCurrent ModeNumber Of Outputs2
Frequency - Max1MHzDuty Cycle50%
Voltage - Supply9 V ~ 10 VBuckNo
BoostNoFlybackNo
InvertingNoDoublerNo
DividerNoCukNo
IsolatedYesOperating Temperature-40°C ~ 85°C
Package / Case8-SOIC (3.9mm Width)Frequency-max1MHz
Duty Cycle (max)50 %Output Current1000 mA
Mounting StyleSMD/SMTSwitching Frequency1000 KHz
Maximum Operating Temperature+ 85 CFall Time25 ns
Minimum Operating Temperature- 40 CRise Time25 ns
Synchronous PinNoTopologyFull-Bridge, Half-Bridge, Push-Pull
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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D
Dual Output Drive Stages in Push-Pull
Configuration
D
Current Sense Discharge Transistor to
Improve Dynamic Response
D
130-µA Typical Starting Current
D
1-mA Typical Run Current
D
Operation to 1 MHz
D
Internal Soft Start
D
On-Chip Error Amplifier With 2-MHz Gain
Bandwidth Product
D
On Chip VDD Clamping
D
Output Drive Stages Capable of 500-mA
Peak-Source Current, 1-A Peak-Sink Current
description
The UCC3808A is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC3808A
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 UCC3808A 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%.
block diagram
FB
2
OVERCURRENT
22 k Ω
COMPARATOR
0.75 V
2.2 V
VDD OK
S
R
VDD−1 V
S
R
0.5 V
SOFT START
VOLTAGE
REFERENCE
SLOPE = 1 V/ms
Note: Pinout shown is for SOIC and PDIP packages. TSSOP pinout is different.
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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
UCC2808A 1, UCC2808A 2, UCC3808A 1, UCC3808A 2
LOW POWER CURRENT MODE PUSH PULL PWM
COMP
OUTA
VDD
COMP
FB
COMP
CS
1
3
PEAK CURRENT
COMPARATOR
2.0 V
0.5 V
OSCILLATOR
Q
1.2R
Q
PWM
COMPARATOR
VDD
R
4
RC
www.ti.com
SLUS456D − APRIL 1999 - REVISED AUGUST 2002
D OR N PACKAGE
(TOP VIEW)
1
8
VDD
OUTA
2
7
FB
OUTB
CS
3
6
GND
RC
4
5
PW PACKAGE
(TOP VIEW)
1
8
OUTB
2
7
GND
3
6
RC
4
5
CS
8
VDD
14 V
7
OUTA
PWM
LATCH
Q
S
T
Q
Q
R
6
OUTB
5
GND
UDG-00097
Copyright  2002, Texas Instruments Incorporated
1

UCC2808ADTR-1 Summary of contents

  • Page 1

    ... Note: Pinout shown is for SOIC and PDIP packages. TSSOP pinout is different. 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. ...

  • Page 2

    UCC2808A 1, UCC2808A 2, UCC3808A 1, UCC3808A 2 LOW POWER CURRENT MODE PUSH PULL PWM SLUS456D − APRIL 1999 - REVISED AUGUST 2002 description (continued) The UCC3808A family offers a variety of package options, temperature range options, and choice of ...

  • Page 3

    T = 0°C to 70°C for the UCC3808A-x, −40°C to 85°C for the UCC2808A-x, A VDD = 10 V (see Note 6), 1-µF capacitor from VDD to GND kΩ 330 pF T otherwise ...

  • Page 4

    UCC2808A 1, UCC2808A 2, UCC3808A 1, UCC3808A 2 LOW POWER CURRENT MODE PUSH PULL PWM SLUS456D − APRIL 1999 - REVISED AUGUST 2002 pin assignments COMP: COMP is the output of the error amplifier and the input of the PWM ...

  • Page 5

    RC 4 VDD 0.2 V NOTE A: The oscillator generates a sawtooth waveform on RC. During the RC rise time, the output stages alternate on time, but both stages are off during the RC fall time. The ...

  • Page 6

    UCC2808A 1, UCC2808A 2, UCC3808A 1, UCC3808A 2 LOW POWER CURRENT MODE PUSH PULL PWM SLUS456D − APRIL 1999 - REVISED AUGUST 2002 Figure 2. Typical Application Diagram: 48-V In, 5-V, 50-W Output 6 APPLICATION INFORMATION www.ti.com UDG-00096 ...

  • Page 7

    OSCILLATOR FREQUENCY vs EXTERNAL RC VALUES 1000 C = 100 220 330 pF 100 C = 1000 820 560 100 150 200 RT ...

  • Page 8

    ... PACKAGING INFORMATION (1) Orderable Device Status UCC2808AD-1 ACTIVE UCC2808AD-1G4 ACTIVE UCC2808AD-2 ACTIVE UCC2808AD-2G4 ACTIVE UCC2808ADTR-1 ACTIVE UCC2808ADTR-1G4 ACTIVE UCC2808ADTR-2 ACTIVE UCC2808ADTR-2G4 ACTIVE UCC2808AN-1 ACTIVE UCC2808AN-1G4 ACTIVE UCC2808AN-2 ACTIVE UCC2808AN-2G4 ACTIVE UCC2808APW-1 ACTIVE UCC2808APW-1G4 ACTIVE UCC2808APW-2 ACTIVE UCC2808APW-2G4 ACTIVE UCC2808APWTR-1 ACTIVE UCC2808APWTR-1G4 ...

  • Page 9

    Orderable Device Status UCC3808ADTR-1G4 ACTIVE UCC3808ADTR-2 ACTIVE UCC3808ADTR-2G4 ACTIVE UCC3808AN-1 ACTIVE UCC3808AN-1G4 ACTIVE UCC3808AN-2 ACTIVE UCC3808AN-2G4 ACTIVE UCC3808APW-1 ACTIVE UCC3808APW-1G4 ACTIVE UCC3808APW-2 ACTIVE UCC3808APW-2G4 ACTIVE UCC3808APWTR-1 ACTIVE UCC3808APWTR-1G4 ACTIVE UCC3808APWTR-2 ACTIVE UCC3808APWTR-2G4 ACTIVE (1) The marketing status values ...

  • Page 10

    TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken ...

  • Page 11

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing UCC2808ADTR-1 SOIC D UCC2808ADTR-2 SOIC D UCC2808APWTR-1 TSSOP PW UCC2808APWTR-2 TSSOP PW UCC3808ADTR-1 SOIC D UCC3808ADTR-2 SOIC D UCC3808APWTR-1 TSSOP PW UCC3808APWTR-2 TSSOP PW PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) ...

  • Page 12

    ... Device Package Type UCC2808ADTR-1 SOIC UCC2808ADTR-2 SOIC UCC2808APWTR-1 TSSOP UCC2808APWTR-2 TSSOP UCC3808ADTR-1 SOIC UCC3808ADTR-2 SOIC UCC3808APWTR-1 TSSOP UCC3808APWTR-2 TSSOP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 D 8 2500 PW 8 2000 PW 8 2000 D 8 2500 ...

  • Page 13

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...