UCC3580-3 PWM Datasheet

UCC3580-3 Datasheet, PDF, Equivalent


Part Number

UCC3580-3

Description

Single Ended Active Clamp/Reset PWM

Manufacture

etcTI

Total Page 17 Pages
Datasheet
Download UCC3580-3 Datasheet


UCC3580-3
Single Ended Active Clamp/Reset PWM
UCC1580-1,-2,-3,-4
UCC2580-1,-2,-3,-4
UCC3580-1,-2,-3,-4
FEATURES
Provides Auxiliary Switch Activation
Complementary to Main Power
Switch Drive
Programmable deadtime (Turn-on
Delay) Between Activation of Each
Switch
Voltage Mode Control with
Feedforward Operation
Programmable Limits for Both
Transformer Volt- Second Product
and PWM Duty Cycle
High Current Gate Driver for Both
Main and Auxiliary Outputs
Multiple Protection Features with
Latched Shutdown and Soft Restart
Low Supply Current (100 mA Startup,
1.5 mA Operation)
DESCRIPTION
The UCC3580 family of PWM controllers is designed to implement a variety
of active clamp/reset and synchronous rectifier switching converter topolo-
gies. While containing all the necessary functions for fixed frequency, high
performance pulse width modulation, the additional feature of this design is
the inclusion of an auxiliary switch driver which complements the main
power switch, and with a programmable deadtime or delay between each
transition. The active clamp/reset technique allows operation of single
ended converters beyond 50% duty cycle while reducing voltage stresses
on the switches, and allows a greater flux swing for the power transformer.
This approach also allows a reduction in switching losses by recovering en-
ergy stored in parasitic elements such as leakage inductance and switch
capacitance.
The oscillator is programmed with two resistors and a capacitor to set
switching frequency and maximum duty cycle. A separate synchronized
ramp provides a voltage feedforward pulse width modulation and a pro-
grammed maximum volt-second limit. The generated clock from the oscilla-
tor contains both frequency and maximum duty cycle information.
(continued)
BLOCK DIAGRAM
Pin Numbers refer to DIL-16 and SOIC-16 packages
SLUS292D - FEBRUARY 1999 - REVISED FEBRUARY 2007
UDG-95069-2

UCC3580-3
DESCRIPTION (cont.)
The main gate drive output (OUT1) is controlled by the
pulse width modulator. The second output (OUT2) is in-
tended to activate an auxiliary switch during the off time
of the main switch, except that between each transition
there is deadtime where both switches are off, pro-
grammed by a single external resistor. This design offers
two options for OUT2, normal and inverted. In the -1 and
-2 versions, OUT2 is normal and can be used to drive
PMOS FETs. In the -3 and -4 versions, OUT2 is inverted
and can be used to drive NMOS FETs. In all versions,
both the main and auxiliary switches are held off prior to
startup and when the PWM command goes to zero duty
cycle. During fault conditions, OUT1 is held off while
OUT2 operates at maximum duty cycle with a guaran-
teed off time equal to the sum of the two deadtimes.
UCC1580-1,-2,-3,-4
UCC2580-1,-2,-3,-4
UCC3580-1,-2,-3,-4
Undervoltage lockout monitors supply voltage (VDD), the
precision reference (REF), input line voltage (LINE), and
the shutdown comparator (SHTDWN). If after any of
these four have sensed a fault condition, recovery to full
operation is initiated with a soft start. VDD thresholds, on
and off, are 15V and 8.5V for the -2 and -4 versions, 9V
and 8.5V for the -1 and -3 versions.
The UCC1580-x is specified for operation over the mili-
tary temperature range of -55°C to 125°C. The
UCC2580-x is specified from -40°C to 85°C. The
UCC3580-x is specified from 0°C to 70°C. Package op-
tions include 16-pin surface mount and dual in-line.
ABSOLUTE MAXIMUM RATINGS
VDD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V
IVDD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
LINE, RAMP . . . . . . . . . . . . . . . . . . . . . . . . 0.3V to VDD + 1V
ILINE, IRAMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3V
IDELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
IOUT1 (tpw < 1 s and Duty Cycle < 10%) . . . . . . . 0.6A to 1.2A
IOUT2 (tpw < 1 s and Duty Cycle < 10%) . . . . . . . 0.4A to 0.4A
ICLK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA to 100mA
OSC1, OSC2, SS, SHTDWN, EAIN . . . . . 0.3V to REF + 0.3V
IEAOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA to 5mA
IREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2V to 0.2V
Storage Temperature . . . . . . . . . . . . . . . . . . -65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . -55°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
All voltages are with respect to ground unless otherwise stated.
Currents are positive into, negative out of the specified termi-
nal. Consult Packaging Section of Databook for thermal limita-
tions and considerations of packages.
CONNECTION DIAGRAMS
DIL-16, SOIC-16 (Top View)
J, N, or D Packages
ORDER INFORMATION
2


Features Single Ended Active Clamp/Reset PWM UCC 1580-1,-2,-3,-4 UCC2580-1,-2,-3,-4 UCC3 580-1,-2,-3,-4 FEATURES Provides Auxil iary Switch Activation Complementary to Main Power Switch Drive Programmable d eadtime (Turn-on Delay) Between Activat ion of Each Switch Voltage Mode Control with Feedforward Operation Programmabl e Limits for Both Transformer Volt- Sec ond Product and PWM Duty Cycle High Cur rent Gate Driver for Both Main and Auxi liary Outputs Multiple Protection Featu res with Latched Shutdown and Soft Rest art Low Supply Current (100 mA Startup, 1.5 mA Operation) DESCRIPTION The UCC 3580 family of PWM controllers is desig ned to implement a variety of active cl amp/reset and synchronous rectifier swi tching converter topologies. While cont aining all the necessary functions for fixed frequency, high performance pulse width modulation, the additional featu re of this design is the inclusion of a n auxiliary switch driver which complem ents the main power switch, and with a programmable deadtime or.
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