UCC28951-Q1 Datasheet, PDF (1/71 Pages) Texas Instruments – Phase-Shifted Full-Bridge Controller

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UCC28951-Q1 Phase-Shifted Full-Bridge Controller
for Wide Input-Voltage Range Applications
UCC28951-Q1
SLUSCK4 – OCTOBER 2016
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 1: –40ºC to
+125ºC Ambient Operating Temperature
Range
– Device HBM ESD Classification Level H2
– Device CDM ESD Classification Level C3B
• Enhanced Zero-Voltage Switching (ZVS) Range
• Direct Synchronous Rectifier (SR) Control
• Light-Load Efficiency Management Including
– Burst Mode Operation
– Discontinuous Conduction Mode (DCM),
Dynamic SR On/Off Control With
Programmable Threshold
– Programmable Adaptive Delay
• Average- or Peak-Current Mode Control With
Programmable Slope Compensation and Voltage-
Mode Control
• Closed-Loop Soft-Start and Enable Function
• Programmable Switching Frequency up to 1 MHz
with Bidirectional Synchronization
• (±3%) Cycle-by-Cycle Current Limit Protection
With Hiccup Mode Support
• 150-µA Start-Up Current
• V_DD Undervoltage Lockout
• Wide Temperature Range, –40°C to +125°C
• Electric Vehicle On-Board Chargers
• Solar Inverters
• Server Power Supply
• UPS
3 Description
The UCC28951-Q1 enhanced phase-shifted full
bridge controller builds upon Texas Instrument’s
industry standard UCx895 controller family with
enhancements that offer best in class efficiency in
today’s high performance power systems. The
UCC28951-Q1 implements advanced control of the
full-bridge along with active control of the
synchronous rectifier (SR) output stage.
Programmable delays ensure ZVS operation over a
wide range of operating conditions, while the load
current naturally tunes the switching delays of the
secondary-side SRs, maximizing overall system
efficiency.
The UCC28951-Q1 offers multiple light-load
management features including burst mode and
dynamic SR on/off control when transitioning in and
out of Discontinuous Current Mode (DCM) operation.
In addition, the UCC28951-Q1 includes support for
current or voltage mode control. Programmable
switching frequency up to 1 MHz and a wide set of
protection features including cycle-by-cycle current
limit, UVLO and thermal shutdown.
The UCC28951-Q1 is available in TSSOP-24
package and is RoHS compliant.
2 Applications
• Phase-Shifted Full-Bridge Converters
• Industrial Power Systems
• High-Density Power Architectures
• Electric Vehicle Inverters
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
UCC28951-Q1
TSSOP (24)
7.80 mm x 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
+
VIN
CIN
-
VSENSE
UCC28951-Q1 Simplified Application
CT
VBIAS
CREF
R1
R2
UCC28951-Q1
1 VREF
GND 24
CVDD
VDD
RLF2
2 EA+
VDD 23
R3
C2
R6 ^R4 C3
ENABLE
C1
R5
CSS
RAB
RCD
3 EA-
4 COMP
5 SS/EN
6 DELAB
7 DELCD
REF
8 DELEF
RTMIN
RT
9 TMIN
VREF
10 RT
RSUM
11 RSUM
RDCMHI
VREF
12 DCM
OUTA 22
OUTB 21
OUTC 20
OUTD 19
OUTE 18
OUTF 17
SYNC 16
CS 15
ADEL 14
ADELEF 13
DA
R7
RLF1
RCS
RDCM
CLF
A
B
A
C
D
E
F
B
SYNC
RAHI
VDD
QA
VDD
QB
RAEFHI
RAEF
UCC27324
QE
E
RA
VDD
QC
C
T1
LOUT
VDD
QD
D
UCC27324
QF
F
VOUT
+
COUT
-
VSENSE
Copyright © 2016, Texas Instruments Incorporated
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.