UCC28083

Manufacturer Part NumberUCC28083
ManufacturerTexas Instruments
UCC28083 datasheet
 


Specifications of UCC28083

TopologyHalf-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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FEATURES
D
Programmable Slope Compensation
D
Internal Soft-Start on the UCC38083/4
D
Cycle-by-Cycle Current Limiting
D
Low Start-Up Current of 120 µA and 1.5 mA
Typical Run Current
D
Single External Component Oscillator
Programmable from 50 kHz to 1 MHz
D
High-Current Totem-Pole Dual Output Stage
Drives Push-Pull Configuration with 1-A Sink
and 0.5-A Source Capability
D
Current Sense Discharge Transistor to
Improve Dynamic Response
D
Internally Trimmed Bandgap Reference
D
Undervoltage Lockout with Hysteresis
BASIC APPLICATION
V IN
TRANSFORMER
VDD
UCC3808x
CTRL
OUTA
RT
OUTB
R F
ISET
CS
GND
R T
R SET
C F
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.
SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009
APPLICATIONS
D
High-Efficiency Switch-Mode Power Supplies
D
Telecom dc-to-dc Converters
D
Point-of-Load or Point-of-Use Power Modules
D
Low-Cost Push-Pull and Half-Bridge
Applications
DESCRIPTION
The UCC38083/4/5/6 is a family of BiCMOS pulse width
modulation (PWM) controllers for dc-to-dc or off-line
fixed-frequency
supplies. The dual output stages are configured for the
push-pull topology. Both outputs switch at half the
oscillator frequency using a toggle flip-flop. The dead
time between the two outputs is typically 110 ns, limiting
each output’s duty cycle to less than 50%.
The new UCC3808x family is based on the UCC3808A
architecture. The major differences include the addition
of a programmable slope compensation ramp to the CS
signal and the removal of the error amplifier. The current
flowing out of the ISET pin through an external resistor
is monitored internally to set the magnitude of the slope
compensation function. This device also includes an
POWER
V OUT
internal discharge transistor from the CS pin to ground,
which is activated at each clock cycle after the pulse is
terminated. This discharges any filter capacitance on
the CS pin during each cycle and helps minimize filter
capacitor values and current sense delay.
The UCC38083 and the UCC38084 devices have a
typical soft-start interval time of 3.5 ms while the
UCC38085 and the UCC38086 has less than 100 µs for
applications where internal soft-start is not desired.
The UCC38083 and the UCC38085 devices have the
turn-on/off thresholds of 12.5 V / 8.3 V, while the
UCC38084 and the UCC38086 has the turn-on/off
R S
thresholds of 4.3 V / 4.1 V. Each device is offered in 8-pin
TSSOP (PW), 8-pin SOIC (D) and 8-pin PDIP (P)
packages.
FEEDBACK
UDG−01080
www.ti.com
current-mode
switching
power
Copyright  2002−2009, Texas Instruments Incorporated
1

UCC28083 Summary of contents

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    ... CS GND SET C F 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. SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 APPLICATIONS D High-Efficiency Switch-Mode Power Supplies ...

  • Page 2

    ... The D and PW packages are available taped and reeled. Add R suffix to device type, e.g. UCC28083DR (2500 devices per reel) or UCC38083PWR (2000 devices per reel PACKAGE (TOP VIEW) CTRL VDD 1 8 ISET ...

  • Page 3

    Supply voltage < Supply current ...

  • Page 4

    SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 electrical characteristics over recommended operating virtual junction temperature range (See Note 1),1-µF capacitor from VDD to GND kΩ −40°C to 85°C ...

  • Page 5

    CTRL 1 Slope Circuit I SLOPE SLOPE = ISET SET CS Circuitry 0.75V 0. 1. TERMINAL NAME NAME PACKAGE I/O I/O D ...

  • Page 6

    SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 detailed pin descriptions CTRL: The error voltage is typically generated by a secondary-side error amplifier and transmitted to the primary-side referenced UCC3808x by means of an opto-coupler. CTRL has an internal divider ...

  • Page 7

    OUTA and OUTB: Alternating high-current output stages. Both stages are capable of driving the gate of a power MOSFET. Each stage is capable of 500-mA peak-source current, and 1-A peak-sink current. The output stages switch at ...

  • Page 8

    SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 The following application circuit shows an isolated 12-V power ( 200 W). Note that the pinout shown is for SOIC-8 and PDIP-8 packages. typical application ...

  • Page 9

    Figure 3 illustrates how the voltage ramp is effectively added to the voltage across the current sense element implement slope compensation. CS OUTA OUTB V RS ADDED RAMP VOLTAGE Pin 3 Figure ...

  • Page 10

    SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 layout considerations To prevent noise problems, bypass VDD to GND with a ceramic capacitor as close to the chip as possible along with an electrolytic capacitor. A 1-µF decoupling capacitor is recommended. ...

  • Page 11

    APPLICATION INFORMATION Figure 5. Reference Design Schematic www.ti.com SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 11 ...

  • Page 12

    SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 OSCILLATOR FREQUENCY vs TIMING RESISTANCE 1200 T = 85°C 1000 800 600 400 200 T = 40° ...

  • Page 13

    TYPICAL CHARACTERISTICS DEAD TIME vs TIMING RESISTANCE OVER VDD 200 180 85°C 160 T = 25° 140 120 100 ...

  • Page 14

    SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 RAMP HEIGHT 25°C 0.6 R SET = 10 kΩ 0.5 0.4 R SET = 18 kΩ 0.3 0.2 R SET = 50 kΩ 0.1 R SET ...

  • Page 15

    UCC3808, 8-Pin Low Power Current Mode Push-Pull PWM, (SLUS168) UCC3808A, 8-Pin Low-Power Current-Mode Push-Pull PWM, (SLUS456) UCC3806, Low Power, Dual Output, Current Mode PWM Controller, (SLUS272) Table 1. 8-Pin ...

  • Page 16

    ... Orderable Device (1) Package Type Package Status UCC28083D ACTIVE SOIC UCC28083DG4 ACTIVE SOIC UCC28083DR ACTIVE SOIC UCC28083DRG4 ACTIVE SOIC UCC28083P ACTIVE PDIP UCC28083PG4 ACTIVE PDIP UCC28083PW ACTIVE TSSOP UCC28083PWG4 ACTIVE TSSOP UCC28084D ACTIVE SOIC UCC28084DG4 ACTIVE SOIC UCC28084DR ACTIVE SOIC UCC28084DRG4 ACTIVE ...

  • Page 17

    Orderable Device (1) Package Type Package Status UCC28084PWRG4 ACTIVE TSSOP UCC28085D ACTIVE SOIC UCC28085DG4 ACTIVE SOIC UCC28085DR ACTIVE SOIC UCC28085DRG4 ACTIVE SOIC UCC28085P ACTIVE PDIP UCC28085PG4 ACTIVE PDIP UCC28085PW ACTIVE TSSOP UCC28085PWG4 ACTIVE TSSOP UCC28086D ACTIVE SOIC UCC28086DG4 ACTIVE ...

  • Page 18

    Orderable Device (1) Package Type Package Status UCC28086PWRG4 ACTIVE TSSOP UCC38083D ACTIVE SOIC UCC38083DG4 ACTIVE SOIC UCC38083DR ACTIVE SOIC UCC38083DRG4 ACTIVE SOIC UCC38083P ACTIVE PDIP UCC38083PG4 ACTIVE PDIP UCC38084D ACTIVE SOIC UCC38084DG4 ACTIVE SOIC UCC38084DR ACTIVE SOIC UCC38084DRG4 ACTIVE ...

  • Page 19

    Orderable Device (1) Package Type Package Status UCC38085DG4 ACTIVE SOIC UCC38085P ACTIVE PDIP UCC38085PG4 ACTIVE PDIP UCC38086D ACTIVE SOIC UCC38086DG4 ACTIVE SOIC UCC38086DR ACTIVE SOIC UCC38086DRG4 ACTIVE SOIC UCC38086P ACTIVE PDIP UCC38086PG4 ACTIVE PDIP (1) The marketing status values ...

  • Page 20

    Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or ...

  • Page 21

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing UCC28083DR SOIC UCC28084DR SOIC UCC28084PWR TSSOP PW UCC28085DR SOIC UCC28086DR SOIC UCC28086PWR TSSOP PW UCC38083DR SOIC UCC38084DR SOIC UCC38084PWR TSSOP PW UCC38086DR SOIC PACKAGE MATERIALS INFORMATION Pins SPQ Reel ...

  • Page 22

    ... Device Package Type UCC28083DR SOIC UCC28084DR SOIC UCC28084PWR TSSOP UCC28085DR SOIC UCC28086DR SOIC UCC28086PWR TSSOP UCC38083DR SOIC UCC38084DR SOIC UCC38084PWR TSSOP UCC38086DR SOIC PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 D 8 2500 ...

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  • Page 27

    ... 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’ ...