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UCC2540PWP Datasheet

  • UCC2540PWP

  • HIGH EFFICIENCY SECONDARY SIDE SYNCHRONOUS BUCK PWM CONTROLL...

  • 37頁(yè)

  • TI

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UCC2540
SLUS539A 鈭?JUNE 2004 鈭?REVISED AUGUST 2004
HIGH EFFICIENCY SECONDARY SIDE
SYNCHRONOUS BUCK PWM CONTROLLER
FEATURES
D
On-Chip Predictive Gate Drivet for
D
D
D
D
D
D
D
D
D
D
High-Efficiency Synchronous Buck
Operation
Dual
鹵3-A
TrueDrivet Outputs
1-MHz High Frequency Operation with 70-ns
Delay from SYNCIN to G1 Output
Leading Edge Modulation
Overcurrent Protection using a Parallel
Average Current Mode Control Loop
3 Modes to Support 2.7-V to 35-V Bias
Operation
Reverse Current Protection for Output Stage
User Programmable Shutdown
鹵1.0%
Initial Tolerance Bandgap Reference
High Bandwidth Error Amplifiers
Thermally Enhanced HTSSOP 20-Pin
PowerPADt Package
APPLICATIONS
D
Secondary-Side Post Regulation (SSPR) for
D
D
Multiple Output Power Supplies
Cascaded Buck Converters
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.
Main
Output
SIMPLIFIED APPLICATION DIAGRAM
Input
C1
UCC25701
FB
OUT
QP
V FB
UCC2540
VEA鈭?7
13 VDRV
14 G2
12 G2S
16 VDD
19 BST
18 G1
20 SWS
17 SW
15 PGND
CEA鈭?8
RSET 1
COMP 9
G2C 3
REF 2
TR 10
Main
Output
RSNS
AUX
Output
R1
R2
11 SS SYNCIN RAMP 5
4
UDG鈭?4057
Predictive Gate Drive錚? TrueDrive錚? and PowerPAD錚? 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
錚?/div>
2004, Texas Instruments Incorporated
www.ti.com
1

UCC2540PWP 產(chǎn)品屬性

  • 70

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 1MHz

  • 100%

  • 8.5 V ~ 35 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 是

  • -40°C ~ 105°C

  • 20-TSSOP（0.173"，4.40mm 寬）裸露焊盤

  • 管件

  • 296-17270-ND - EVALUATION MODULE FOR UCC2540

  • 296-17103-5

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