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UCC28230 Datasheet Preview

UCC28230 Datasheet

PWM Controller

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UCC28230
UCC28231
www.ti.com ................................................................................................................................................... SLUS814A – FEBRUARY 2008 – REVISED JUNE 2008
Advanced PWM Controller for Bus Converters
FEATURES
1
Programmable, Load Depended Off Time
Control
Frequency Controlled Start Up Allows Small
Output Inductor, Low Ripple and Constant
Current Start with Large Output Capacitor
Two 0.2-A Push-Pull Outputs Provide Matched
Control Signals D to External Drivers
Two Additional 1- D Outputs for Optimal Use
of Self-Driven or Control Driven Synchronous
Rectifiers
Unregulated, Fixed Volt-Second or Fixed
Frequency Modes set by User
Two, 1.5% Overall Accuracy Reference Voltage
Options: 5-V for UCC28230 and 3.3-V for
UCC28231
Resistor Programmable Switching Frequency
up to 1 MHz
Cycle-by-Cycle Current Limit Allows Parallel
Operation with Droop Based Current Sharing
Single External Capacitor sets Soft-Start and
Over Current Hiccup Mode Parameters with
Restart
Severe Short Circuit Hiccup with Restart or
Latch Off Protection Option by External
Resistor
Input Under Voltage Lock Out
Thermal Shutdown
Thermally Enhanced 3 mm × 2 mm SON-12
and TSSOP-14 Package Options
APPLICATIONS
Intermediate Bus Isolated Converters
DC-to-DC Transformers
DESCRIPTION
The UCC28230, UCC28231 PWM bus controllers are
optimized for use in high efficiency, high power
density, unregulated intermediate bus converters.
Topologies include push-pull, half-bridge and
full-bridge. External drivers, such as the UCC27200
120-V high-side/low-side drivers, can be used with
this controller.
Low cost, small size and highly efficient solutions are
provided by innovations such as:
Start-up frequency control circuit allowing small
output inductor and the ability to start with large
intermediate bus capacitor.
Load depended off-time control set by user.
Additional 1-D control outputs can be used for
primary winding clamping in self-driven output
synchronous rectifier applications or as drive signals
for the control-driven synchronous rectifier.
Cycle-by-cycle current limit prevents overstresses of
converter. If the over current condition causes less
than 80% duty cycle at the output, then after a
programmed time the controller proceeds into
periodical shutdown and restart hiccup mode.
The UCC28230 provides 5 V, and the UCC28231
provides 3.3-V precision reference voltages with 1.5%
overall accuracy and 10-mA output current. This
reference voltage can be used to supply
housekeeping circuit and/or microcontroller. The
precision reference voltage can also be used for
accurate setting of system parameters.
Other features include under-voltage lockout, thermal
shut down, programmable soft start, over-current
hiccup mode and short circuit protection with internal
restart by default that can be set into latch-off mode
by an external resistor.
1
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated




etcTI

UCC28230 Datasheet Preview

UCC28230 Datasheet

PWM Controller

No Preview Available !

UCC28230
UCC28231
SLUS814A – FEBRUARY 2008 – REVISED JUNE 2008 ................................................................................................................................................... www.ti.com
TYPICAL APPLICATION DIAGRAMS
+
Vin
36 V to60V
Vbias
UCC 27200
VDD
HB
HI HO
HS
LI
LO
CT
UCC 27200
VDD
HB
HO HI
HS
LI
LO
Vbias
VSS
_
VSS
Bias
Power
Supply
Vbias
Interface
with
System
Vcc =5 V or 3.3V
Housekeeping
Micro
Controller
VDD
12
VDD
UVLO Thermal
Comp. Shutdown
6.3 V rise
VREF 5.7 V fall
1
R1 OS
3
R3
R2
2
OST
Off Time
Control
Circuit
VDD
5V/3.3V
LDO
Short Circuit
Shutdown
CS
Is
6
Cycle b-y -
Cycle Current
Limit
EN
Logic
Block
Oscillator & CLK
Vin RT
Start Up
4 Frequency
Soft Start &
Hiccup Current
Control
Limit Circuit
5
SS
VDD
Reference
Generator
O1_ DIN
10
O2_ DIN
8
O1_D
11
O2_D
9
GND
7
+
Vout
7 V to12 V
400W
_
Figure 1. Full-Bridge Bus Converter
+
Vin
36V to 60V
_
Vbias
UCC 27200
VDD
HB
HI HO
HS
LI
LO
VSS
Bias
Power
Supply
Vbias
Interface
with
System
Vcc =5V or 3.3V
Houskeeping
Micro-
Controller
CT
+
Vout
7V to 12V
200W
_
UCC28230/1
V DD
12
VDD
UVLO Thermal
Comp. Shutdown
6.3 V rise
VREF 5.7 V fall
1
R1 OS
3
R3
R2
2
OST
Off Time
Control
Circuit
VDD
5V/3.3V
LDO
Short Circuit
Shutdown
CS
Is
6
Cycle b-y -
Cycle Current
Limit
EN
Logic
Block
Oscillator & CLK
Vin RT
Start Up
4 Frequency
Soft Start &
Hiccup Current
Control
Limit Circuit
5
SS
VDD
Reference
Generator
O1_ DIN
10
O2_ DIN
8
O1_D
11
O2_D
9
GND
7
Vbias
INA
2
INB
4
VDD
6
OUTA
7
OUTB
5
3
GND
UCC27324
Figure 2. Half-Bridge Bus Converter with Control-Driven Synchronous Rectifier
2 Submit Documentation Feedback
Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): UCC28230 UCC28231


Part Number UCC28230
Description PWM Controller
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