IC PWM CURRENT MODE 8TSSOP

UCC28086PWRG4

Manufacturer Part NumberUCC28086PWRG4
DescriptionIC PWM CURRENT MODE 8TSSOP
ManufacturerTexas Instruments
UCC28086PWRG4 datasheets
 


Specifications of UCC28086PWRG4

Pwm TypeCurrent ModeNumber Of Outputs2
Frequency - Max1MHzDuty Cycle50%
Voltage - Supply4.3 V ~ 15 VBuckNo
BoostNoFlybackNo
InvertingNoDoublerNo
DividerNoCukNo
IsolatedNoOperating Temperature-40°C ~ 85°C
Package / Case8-TSSOPFrequency-max1MHz
Duty Cycle (max)50 %Output Current1000 mA
Mounting StyleSMD/SMTSwitching Frequency50 KHz to 1000 KHz
Maximum Operating Temperature+ 85 CFall Time25 ns
Minimum Operating Temperature- 40 CRise Time25 ns
Synchronous PinNoTopologyHalf-Bridge, Push-Pull
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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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.
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
SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003
current-mode
switching
power
Copyright  2002−2003, Texas Instruments Incorporated
1

UCC28086PWRG4 Summary of contents

  • Page 1

    ... OUTB R F ISET 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. APPLICATIONS D High-Efficiency Switch-Mode Power Supplies D Telecom dc-to-dc Converters D Point-of-Load or Point-of-Use Power Modules ...

  • Page 2

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 ORDERING INFORMATION PACKAGE SOIC−8 (D) PDIP−8 (P) TSSOP−8 (PW) NOTES: (1) Specified θja (junction to ambient) is for devices mounted to 5-inch 2 FR4 PC board with one ounce copper where noted. ...

  • Page 3

    Supply voltage < Supply current ...

  • Page 4

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 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

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 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

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 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

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 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 SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 11 ...

  • Page 12

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 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

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 RAMP HEIGHT 25°C 0.6 R SET = 10 Ω 0.5 0.4 R SET = 18 Ω 0.3 0.2 R SET = 50 Ω 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

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 D (R-PDSO-G**) 8 PINS SHOWN 0.050 (1,27 0.069 (1,75) MAX NOTES: A. All linear dimensions are in inches (millimeters). B. This drawing is subject to change without ...

  • Page 17

    P (PDIP) 0.400 (10,60) 0.355 (9,02 0.260 (6,60) 0.240 (6,10 0.070 (1,78) MAX 0.020 (0,51) MIN 0.200 (5,08) MAX 0.125 (3,18) MIN 0.100 (2,54) 0.021 (0,53) 0.010 (0,25) 0.015 (0,38) NOTES: A. All linear dimensions are ...

  • Page 18

    SLUS488B − SEPTEMBER 2002 − REVISED MAY 2003 PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PINS SHOWN 0, 0,15 1,20 MAX 0,05 PINS ** DIM A MAX A MIN NOTES:A. All linear dimensions are in millimeters. B. ...

  • Page 19

    PACKAGING INFORMATION (1) Orderable Device Status UCC28083D ACTIVE UCC28083DR ACTIVE UCC28083DRG4 ACTIVE UCC28083P ACTIVE UCC28083PW ACTIVE UCC28083PWR ACTIVE UCC28084D ACTIVE UCC28084DR ACTIVE UCC28084P ACTIVE UCC28084PW ACTIVE UCC28084PWR ACTIVE UCC28085D ACTIVE UCC28085DR ACTIVE UCC28085P ACTIVE UCC28085PG4 ACTIVE UCC28085PW ACTIVE UCC28085PWR ...

  • Page 20

    Orderable Device Status UCC38086DR ACTIVE UCC38086P ACTIVE UCC38086PW ACTIVE UCC38086PWR ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and ...

  • Page 21

    P (R-PDIP-T8) 0.400 (10,60) 0.355 (9,02 0.260 (6,60) 0.240 (6,10 0.070 (1,78) MAX 0.020 (0,51) MIN 0.200 (5,08) MAX 0.125 (3,18) MIN 0.100 (2,54) 0.021 (0,53) 0.010 (0,25) 0.015 (0,38) NOTES: A. All linear dimensions are ...

  • Page 22

    ...

  • Page 23

    PW (R-PDSO-G**) 14 PINS SHOWN 0, 0,15 1,20 MAX 0,05 PINS ** DIM A MAX A MIN NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. C. Body ...

  • Page 24

    ... TI product or service and is an unfair and deceptive business practice not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: ...