UCC2808-2

Manufacturer Part NumberUCC2808-2
ManufacturerTexas Instruments
UCC2808-2 datasheet
 


Specifications of UCC2808-2

TopologyFull-Bridge, Half-Bridge, Push-PullControl MethodCurrent
Duty Cycle(max)(%)50Frequency(max)(khz)1000
Uvlo Thresholds On/off(v)4.3/4.1Pin/package8PDIP, 8SOIC
Vin(min)(v)4.1Vin(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
130- A 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 UCC3808 is a family of BiCMOS push-pull, high-speed, low-power, pulse-width modulators. The UCC3808
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 UCC3808 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%. (continued)
block diagram
FB
2
OVERCURRENT
22 k
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.
UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2
LOW POWER CURRENT MODE PUSH-PULL PWM
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
SLUS168D – APRIL 1999 – REVISED AUGUST 2002
D OR N PACKAGE
(TOP VIEW)
1
8
VDD
COMP
2
7
OUTA
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-02116
Copyright
2002, Texas Instruments Incorporated
1

UCC2808-2 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. UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 LOW POWER CURRENT MODE PUSH-PULL PWM OUTA VDD COMP ...

  • Page 2

    ... UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 LOW POWER CURRENT MODE PUSH-PULL PWM SLUS168D – APRIL 1999 – REVISED AUGUST 2002 description (continued) The UCC3808 family offers a variety of package temperature range 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 table below ...

  • Page 3

    ... Start threshold and zener shunt threshold track one another. 5. For UCCx808–1, set VDD above the start threshold before setting Does not include current in the external oscillator network. UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 LOW POWER CURRENT MODE PUSH-PULL PWM SLUS168D – APRIL 1999 – REVISED AUGUST 2002 ...

  • Page 4

    ... UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 LOW POWER CURRENT MODE PUSH-PULL PWM SLUS168D – APRIL 1999 – REVISED AUGUST 2002 electrical characteristics , for the UCC3808–x, – for the UCC2808–x and – 125 C for the UCC1808–x, VDD = 10 V (See Note 6 capacitor from VDD to GND 330 pF, ...

  • Page 5

    ... OUT To prevent noise problems, bypass VDD to GND with a ceramic capacitor as close to the chip as possible along with an electrolytic capacitor decoupling capacitor is recommended. UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 LOW POWER CURRENT MODE PUSH-PULL PWM SLUS168D – APRIL 1999 – REVISED AUGUST 2002 www.ti.com ...

  • Page 6

    ... UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 LOW POWER CURRENT MODE PUSH-PULL PWM SLUS168D – APRIL 1999 – REVISED AUGUST 2002 pin descriptions (continued) NOTE: 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 output stages switch a ½ the oscillator frequency, with guaranteed duty cycle of < ...

  • Page 7

    V IN BYV 4700 F 0. 28–200 1000 pF – 1/4 W IRF640 2 0 0.2 VDD 8 330 pF 1 COMP CURRENT ...

  • Page 8

    ... UCC2808-1, UCC2808-2, UCC3808-1, UCC3808-2 LOW POWER CURRENT MODE PUSH-PULL PWM SLUS168D – APRIL 1999 – REVISED AUGUST 2002 FREQUENCY vs TIMING RESISTOR 1000 CT=330pF CT=100pF 100 CT=220pF 10 CT=1000pF CT=820pF CT=560pF 100 150 200 250 R T – Timing Resistor – k Figure 3 ERROR AMPLIFIER GAIN AND PHASE ...

  • Page 9

    ... PACKAGING INFORMATION (1) Orderable Device Status UCC2808D-1 ACTIVE UCC2808D-1G4 ACTIVE UCC2808D-2 ACTIVE UCC2808D-2G4 ACTIVE UCC2808DTR-1 ACTIVE UCC2808DTR-1G4 ACTIVE UCC2808DTR-2 ACTIVE UCC2808DTR-2G4 ACTIVE UCC2808N-1 ACTIVE UCC2808N-1G4 ACTIVE UCC2808N-2 ACTIVE UCC2808N-2G4 ACTIVE UCC3808D-1 ACTIVE UCC3808D-1G4 ACTIVE UCC3808D-2 ACTIVE UCC3808D-2G4 ACTIVE UCC3808DTR-1 ACTIVE UCC3808DTR-1G4 ACTIVE ...

  • Page 10

    ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but ...

  • Page 11

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing UCC2808DTR-1 SOIC D UCC2808DTR-2 SOIC D UCC3808DTR-1 SOIC D UCC3808DTR-2 SOIC D PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 8 2500 330.0 12.4 6.4 8 2500 330.0 12.4 6.4 8 2500 330.0 12 ...

  • Page 12

    ... Device Package Type UCC2808DTR-1 SOIC UCC2808DTR-2 SOIC UCC3808DTR-1 SOIC UCC3808DTR-2 SOIC PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 D 8 2500 D 8 2500 D 8 2500 Pack Materials-Page 2 19-Mar-2008 Width (mm) Height (mm) 340.5 338.1 20.6 340.5 338 ...

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  • Page 17

    ... 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’ ...