Controllers. UCC38084 Datasheet

UCC38084 Datasheet PDF


Part

UCC38084

Description

8-Pin Current Mode Push-Pull PWM Controllers

Manufacture

etcTI

Page 28 Pages
Datasheet
Download UCC38084 Datasheet


UCC38084 Datasheet
UCC28083, UCC28084, UCC28085, UCC28086
UCC38083, UCC38084, UCC38085, UCC38086
SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009
8ĆPIN CURRENT MODE PUSHĆPULL PWM CONTROLLERS
WITH PROGRAMMABLE SLOPE COMPENSATION
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
VDD
UCC3808x
CTRL OUTA
RT OUTB
ISET
CS
RT
R SET
GND
POWER
TRANSFORMER
RF
CF RS
FEEDBACK
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 current-mode switching power
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
VOUT
compensation function. This device
internal discharge transistor from the
also includes an
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
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.
UDG−01080
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.
www.ti.com
Copyright 2002−2009, Texas Instruments Incorporated
1

UCC38084 Datasheet
UCC28083, UCC28084, UCC28085, UCC28086
UCC38083, UCC38084, UCC38085, UCC38086
SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009
ORDERING INFORMATION
THERMAL RESISTANCE TABLE
PACKAGE
SOIC−8 (D)
θjc(°C/W)
42
θja(°C/W)
84 to 160(1)
PDIP−8 (P)
50
110(1)
TSSOP−8 (PW)
32(2)
232 to 257(2)
NOTES: (1) Specified θja (junction to ambient) is for devices mounted to 5-inch2 FR4 PC board
with one ounce copper where noted. When resistance range is given, lower values
are for 5 inch2 aluminum PC board. Test PWB was 0.062 inch thick and typically
used 0.635-mm trace widths for power packages and 1.3-mm trace widths for
non-power packages with a 100-mil x 100-mil probe land area at the end of each
trace.
(2). Modeled data. If value range given for θja, lower value is for 3x3 inch. 1 oz internal
copper ground plane, higher value is for 1x1-inch. ground plane. All model data
assumes only one trace for each non-fused lead.
AVAILABLE OPTIONS
TA
INTERNAL
SOFT START
UVLO
ON OFF
SOIC-8 (D)
PACKAGES
PDIP-8 (P)
TSSOP-8 (PW)
−40°C to 85°C
3.5 ms
75 µs
12.5 V
4.3 V
12.5 V
4.3 V
8.3 V
4.1 V
8.3 V
4.1 V
UCC28083D
UCC28084D
UCC28085D
UCC28086D
UCC28083P
UCC28084P
UCC28085P
UCC28086P
UCC28083PW
UCC28084PW
UCC28085PW
UCC28086PW
0°C to 70°C
3.5 ms
75 µs
12.5 V
4.3 V
12.5 V
4.3 V
8.3 V
4.1 V
8.3 V
4.1 V
UCC38083D
UCC38084D
UCC38085D
UCC38086D
UCC38083P
UCC38084P
UCC38085P
UCC38086P
UCC38083PW
UCC38084PW
UCC38085PW
UCC38086PW
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).
D OR P PACKAGE
(TOP VIEW)
PW PACKAGE
(TOP VIEW)
CTRL
ISET
CS
RT
1
2
3
4
8 VDD
7 OUTA
6 OUTB
5 GND
OUTA
VDD
CTRL
ISET
1
2
3
4
8 OUTB
7 GND
6 RT
5 CS
2 www.ti.com


Features Datasheet pdf UCC28083, UCC28084, UCC28085, UCC28086 U CC38083, UCC38084, UCC38085, UCC38086 SLUS488E − SEPTEMBER 2002 − REVISED JULY 2009 8ĆPIN CURRENT MODE PUSHĆPU LL PWM CONTROLLERS WITH PROGRAMMABLE SL OPE COMPENSATION FEATURES D Programmab le Slope Compensation D Internal Soft-S tart on the UCC38083/4 D Cycle-by-Cycle Current Limiting D Low Start-Up Curren t of 120 µA and 1.5 mA Typical Run Cur rent D Single External Component Oscill ator Programmable from 50 kHz to 1 MHz D High-Current Totem-Pole Dual Output S tage Drives Push-Pull Configuration wit h 1-A Sink and 0.5-A Source Capability D Current Sense Discharge Transistor to Improve Dynamic Response D Internally Trimmed Bandgap Reference D Undervoltag e Lockout with Hysteresis BASIC APPLICA TION V IN VDD UCC3808x CTRL OUTA RT OUTB ISET CS RT R SET GND POWER TR ANSFORMER RF CF RS FEEDBACK APPLICATIO NS 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.
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