UCC2540 Controller Datasheet

UCC2540 Datasheet, PDF, Equivalent


Part Number

UCC2540

Description

High-Efficiency Secondary Side Synchronous PWM Controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download UCC2540 Datasheet


UCC2540
UCC2540
ą
SLUS539C − JUNE 2004 − REVISED OCTOBER 2008
HIGHĆEFFICIENCY SECONDARYĆSIDE
SYNCHRONOUS BUCK PWM CONTROLLER
FEATURES
D On-Chip Predictive Gate Drivet for
High-Efficiency Synchronous Buck
Operation
D Dual ±3-A TrueDrivet Outputs
D 1-MHz High Frequency Operation with 70-ns
Delay from SYNCIN to G1 Output
D Leading Edge Modulation
D Overcurrent Protection using a Parallel
Average Current Mode Control Loop
D 3 Modes to Support 2.7-V to 35-V Bias
Operation
D Reverse Current Protection for Output Stage
D User Programmable Shutdown
D ±1.0% Initial Tolerance Bandgap Reference
D High Bandwidth Error Amplifiers
D Thermally Enhanced HTSSOP 20-Pin
PowerPADt Package
SIMPLIFIED APPLICATION DIAGRAM
APPLICATIONS
D Secondary-Side Post Regulation (SSPR) for
Multiple Output Power Supplies
D Cascaded Buck Converters
D Post Processing Converters for Bus
Converter and DC Transformer Architectures
DESCRIPTION
The UCC2540 is a secondary-side synchronous
buck PWM controller for high current and low
output voltage applications. It can be used either
as the local secondary-side controller for isolated
dc-to-dc converters using two-stage cascaded
topologies or as a secondary-side post regulator
(SSPR) for multiple output power supplies.
The UCC2540 runs with the synchronization
signal from either the primary side or the high duty
cycle quasi-dc output of bus converters or dc
transformers. For higher efficiency, it also
incorporates the Predictive Gate Drivet
technology that virtually eliminates body diode
conduction losses in synchronous rectifiers.
Input
C1
UCC25701
OUT
FB QP
V FB
UCC2540
13 VDRV
VEA− 7
14 G2
REF 2
12 G2S
16 VDD
19 BST
TR 10
COMP 9
18 G1
G2C 3
20 SWS
17 SW
CEA− 8
15 PGND
RSET 1
11 SS SYNCIN RAMP 5
4
Main
Output
Main
Output
RSNS
AUX
Output
R1
R2
UDG−04057
Predictive Gate Drive, TrueDrive, and PowerPAD, are a trademarks of Texas Instruments Incorporated.
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.
Copyright 2004, Texas Instruments Incorporated
www.ti.com
1

UCC2540
UCC2540
ą
SLUS539C − JUNE 2004 − REVISED OCTOBER 2008
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.
DESCRIPTION (CONT.)
The UCC2540 is available in the extended temperature range of –40°C to 105°C and is offered in thermally
enhanced PowerPADt 20-pin HTSSOP (PWP) package. This space saving package with standard 20-pin
TSSOP footprint has a drastically lower thermal resistance of 1.4°C/W θJC to accommodate the dual
high-current drivers on board.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)(2)
UCC2540
UNIT
Supply voltage range, VDD
36 V
Supply current, IVDD
VDD
CEA−, COMP, G2C, RAMP, SS, TR, VEA−
50
−0.3 to 3.6
mA
VDRV
−0.3 to 9
Analog input voltages
G1, BST
SW, SWS
SW−0.3 to SW+9
−1 to 36
V
G2, G2S
−1 to 9
SYNCIN
−0.3 to 8.0
Sink current (peak), IOUT_SINK
Source current (peak), IOUT_SOURCE
G1, G2
G1, G2
3.5
−3.5
A
Operating junction temperature range, TJ
−55 to 150
Storage temperature, Tstg
−65 to 150
°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
300
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions”
is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltages are with respect to GND. Currents are positive into, and negative out of the specified terminal.
RECOMMENDED OPERATING CONDITIONS
Supply voltage, VDD
Supply voltage, VDRV
Supply voltage, REF
Supply voltage bypass, CVDD
Reference bypass capacitor, CREF
VDRV bypass capacitor, CVDRV
BST−SW bypass capacitor, CBST−SW
Timer current resistor range, RRSET
PWM ramp capacitor range, CRAMP
Turn-off capacitor range, CG2C
COMP pin load range, RLOAD
Junction operating temperature, TJ
Mode 1
Mode 2
Mode 3
MIN TYP MAX UNIT
8.5 35
4.75 8.00 V
3.0 3.3 3.6
1.0 2.2
0.1 1.0 2.2
µF
0.2
0.1
10 50 k
100 680
pF
120 1000
6.5 k
−40 105 °C
2 www.ti.com


Features UCC2540 ą SLUS539C − JUNE 2004 − R EVISED OCTOBER 2008 HIGHĆEFFICIENCY SE CONDARYĆSIDE SYNCHRONOUS BUCK PWM CONT ROLLER FEATURES D On-Chip Predictive G ate Drivet for High-Efficiency Synchron ous Buck Operation D Dual ±3-A TrueDri vet Outputs D 1-MHz High Frequency Oper ation with 70-ns Delay from SYNCIN to G 1 Output D Leading Edge Modulation D Ov ercurrent Protection using a Parallel A verage Current Mode Control Loop D 3 Mo des to Support 2.7-V to 35-V Bias Opera tion D Reverse Current Protection for O utput Stage D User Programmable Shutdow n D ±1.0% Initial Tolerance Bandgap Re ference D High Bandwidth Error Amplifie rs D Thermally Enhanced HTSSOP 20-Pin P owerPADt Package SIMPLIFIED APPLICATION DIAGRAM APPLICATIONS D Secondary-Side Post Regulation (SSPR) for Multiple Ou tput Power Supplies D Cascaded Buck Con verters D Post Processing Converters fo r Bus Converter and DC Transformer Arch itectures DESCRIPTION The UCC2540 is a secondary-side synchronous buck PWM controller for high current and low .
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