UCC2808A-1

Manufacturer Part NumberUCC2808A-1
ManufacturerTexas Instruments
UCC2808A-1 datasheet
 


Specifications of UCC2808A-1

TopologyFull-Bridge, Half-Bridge, Push-PullControl MethodCurrent
Duty Cycle(max)(%)50Frequency(max)(khz)1000
Uvlo Thresholds On/off(v)12.5/8.3Pin/package8PDIP, 8SOIC, 8TSSOP
Vin(min)(v)8.3Vin(max)(v)15
Regulated Outputs(#)2Operating Temperature Range(c)-40 to 85
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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

UCC2808A-1 Summary of contents

  • Page 1

    ... 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 ...

  • Page 2

    ... Currents are positive into, negative out of the specified terminal. Consult Packaging Section of the Power Supply Control Data Book (TI Literature Number SLUD003) for thermal limitations and considerations of packages. electrical characteristics 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 ...

  • 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 noted) Error Amplifier Section Input voltage COMP = 2 V Input bias current ...

  • 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 comparator. The error amplifier in the UCC3808A is a true low-output impedance, 2-MHz operational amplifier. As such, the COMP pin can both source and sink current ...

  • Page 5

    ... Several design options are iron powder, molypermalloy (MPP ferrite core with an air gap as shown here. The main power transformer has a Magnetics Inc. ER28 size core made of P material for efficient operation at this frequency and temperature. The input voltage may range from dc. UCC2808A 1, UCC2808A 2, UCC3808A 1, UCC3808A 2 LOW POWER CURRENT MODE PUSH PULL PWM 2 ...

  • 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

    ... VDD = 7.5 V 150 100 VDD = −100 − 100 150 Temperature - °C Figure 9 UCC2808A 1, UCC2808A 2, UCC3808A 1, UCC3808A 2 LOW POWER CURRENT MODE PUSH PULL PWM TYPICAL CHARACTERISTICS IDD vs OSCILLATOR FREQUENCY VDD = IDD 10 with 1 nF load ...

  • Page 8

    ... ACTIVE SOIC UCC2808ADTR-2 ACTIVE SOIC UCC2808ADTR-2G4 ACTIVE SOIC UCC2808AN-1 ACTIVE PDIP UCC2808AN-1G4 ACTIVE PDIP UCC2808AN-2 ACTIVE PDIP UCC2808AN-2G4 ACTIVE PDIP UCC2808APW-1 ACTIVE TSSOP UCC2808APW-1G4 ACTIVE TSSOP UCC2808APW-2 ACTIVE TSSOP UCC2808APW-2G4 ACTIVE TSSOP UCC2808APWTR-1 ACTIVE TSSOP Pins Package Qty (2) Eco Plan Drawing ...

  • Page 9

    ... Orderable Device (1) Package Type Package Status UCC2808APWTR-1G4 ACTIVE TSSOP UCC2808APWTR-2 ACTIVE TSSOP UCC2808APWTR-2G4 ACTIVE TSSOP UCC3808AD-1 ACTIVE SOIC UCC3808AD-1G4 ACTIVE SOIC UCC3808AD-2 ACTIVE SOIC UCC3808AD-2G4 ACTIVE SOIC UCC3808ADTR-1 ACTIVE SOIC UCC3808ADTR-1G4 ACTIVE SOIC UCC3808ADTR-2 ACTIVE SOIC UCC3808ADTR-2G4 ACTIVE SOIC ...

  • Page 10

    Orderable Device (1) Package Type Package Status UCC3808APW-2G4 ACTIVE TSSOP UCC3808APWTR-1 ACTIVE TSSOP UCC3808APWTR-1G4 ACTIVE TSSOP UCC3808APWTR-2 ACTIVE TSSOP UCC3808APWTR-2G4 ACTIVE TSSOP (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: ...

  • 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 ...

  • 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 ...

  • 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’ ...