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UCC28251 Datasheet(PDF) 1 Page - Texas Instruments

Part No. UCC28251
Description  UCC28251 Advanced PWM Controller With Prebias Operation
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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UCC28251 Datasheet(HTML) 1 Page - Texas Instruments

 
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VREF
RAMP
RT
SS
SRB
SRA
OUTB
OUTA
VSENSE
GND
UCC28251
HI
LI
LO
HO
700-V Driver
400 V
Isolation
UCC2752x
VOUT
Not Shown : PS, SP, HICC , VDD , EA+, EN AND ILIM
Primary
FB
Secondary
Secondary
Secondary
OVP
RAMP
RT
SS
SRB
SRA
OUTB
OUTA
COMP
GND
UCC28251
VIN (36 V ~ 48 V)
HI
LO
LO
HI
UCC27210A
VIN (36 V ~ 48 V)
Feedback and Isolation
Isolation
UCC272x
VOUT
Not Shown : PS, SP, HICC , VDD, EA+, EA-, VREF , EN, ILIM, AND VSENSE
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UCC28251
SLUSBD8E – FEBRUARY 2013 – REVISED DECEMBER 2014
UCC28251 Advanced PWM Controller With Prebias Operation
1 Features
3 Description
The UCC28251 PWM controller is designed for high
1
Prebiased Startup
power density applications that may have stringent
Synchronous Rectifier Control Outputs with
prebiased startup requirements. The UCC28251’s
Programmable Delays (Including Zero Delay
integrated synchronous rectifier control outputs target
Support)
high efficiency and high performance topologies such
as half-bridge, full-bridge, interleaved forward, and
Voltage Mode Control with Input Voltage Feed-
push-pull. The UCC27210 half bridge drivers and
Forward or Current Mode Control
UCC2752x MOSFET drivers used in conjunction with
Primary or Secondary-Side Control
the UCC28251 provide a complete power converter
3.3-V, 1.5% Accurate Reference Output
solution.
Lower Minimum Operating Frequency
The
UCC28251
is
a
functional
variant
of
the
1% Accurate Cycle-by-Cycle Over Current
UCC28250 PWM Controller. While the same basic
Protection with Matched Duty Cycle Outputs
functionality of the UCC28250 is largely maintained,
the UCC28251 is designed to enhance performance
Programmable Soft-Start and Hiccup Restart
in both offline, 400-V input DC-to-DC applications and
Timer
48-V input full-bridge or half-bridge applications.
Thermally Enhanced 4-mm x 4-mm VQFN-20
Package and 20-pin TSSOP Package
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
2 Applications
TSSOP (20)
6.50 mm × 4.40 mm
UCC28251
Half-Bridge, Full-Bridge, Interleaved Forward, and
VQFN (20)
4.00 mm × 4.00 mm
Push-Pull Isolated Converters
(1) For all available packages, see the orderable addendum at
Telecom and Data-com Power
the end of the datasheet.
Wireless Base Station Power
Server Power
Industrial Power Systems
Simple Application Diagram (400-VIN DC-to-DC
Simple Application Diagram (48-VIN DC-to-DC
Converter)
Converter)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.


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