SLUS774C AUGUST 2007 – December 2014 TPS54383 , TPS54386
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Voltage Reference
- 7.3.2 Oscillator
- 7.3.3 Input Undervoltage Lockout (UVLO) and Startup
- 7.3.4 Enable and Timed Turn On of the Outputs
- 7.3.5 Output Voltage Sequencing
- 7.3.6 Soft-Start
- 7.3.7 Output Voltage Regulation
- 7.3.8 Feedback Loop and Inductor-Capacitor (L-C) Filter Selection
- 7.3.9 Inductor-Capacitor (L-C) Selection
- 7.3.10 Maximum Output Capacitance
- 7.3.11 Minimum Output Capacitance
- 7.3.12 Modifying The Feedback Loop
- 7.3.13 Example: TPS54386 Buck Converter Operating at 12-V Input, 3.3-V Output and 400-mA(P-P) Ripple Current
- 7.3.14 Bootstrap for the N-Channel MOSFET
- 7.3.15 Light Load Operation
- 7.3.16 SW Node Ringing
- 7.3.17 Output Overload Protection
- 7.3.18 Operating Near Maximum Duty Cycle
- 7.3.19 Dual Supply Operation
- 7.3.20 Cascading Supply Operation
- 7.3.21 Multiphase Operation
- 7.3.22 Bypass and FIltering
- 7.3.23 Overtemperature Protection and Junction Temperature Rise
- 7.3.24 Power Derating
- 7.4 Device Functional Modes
-
8 Applications and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
12-V to 5-V and 3.3-V Converter
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 Duty Cycle Estimation
- 8.2.1.2.2 Inductor Selection
- 8.2.1.2.3 Rectifier Diode Selection
- 8.2.1.2.4 Output Capacitor Selection
- 8.2.1.2.5 Voltage Setting
- 8.2.1.2.6 Compensation Capacitors
- 8.2.1.2.7 Input Capacitor Selection
- 8.2.1.2.8 Boot Strap Capacitor
- 8.2.1.2.9 ILIM
- 8.2.1.2.10 SEQ
- 8.2.1.2.11 Power Dissipation
- 8.2.1.3 Application Curves
- 8.2.2 24-V to 12-V and 24-V to 5-V
- 8.2.3 5-V to 3.3V and 5-V to 1.2 V
- 8.2.1
12-V to 5-V and 3.3-V Converter
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
請(qǐng)參考 PDF 數(shù)據(jù)表獲取器件具體的封裝圖。
機(jī)械數(shù)據(jù) (封裝 | 引腳)
- PWP|14
散熱焊盤(pán)機(jī)械數(shù)據(jù) (封裝 | 引腳)
- PWP|14
訂購(gòu)信息
11 Device and Documentation Support
11.1 Device Support
The following parts have characteristics similar to the TPS54383/6 and may be of interest.
Table 4. Devices Related to the TPS54383 and TPS54386
| TI LITERATURE NUMBER | DEVICE | DESCRIPTION |
|---|---|---|
| SLUS642 | TPS40222 | 5-V Input, 1.6-A Non-Synchronous Buck Converter |
| SLUS749 | TPS54283 / TPS54286 | 2-A Dual Non-Synchronous Converter with Integrated High-Side MOSFET |
11.1.1 Definition of Symbols
| CDJ | Average junction capacitance of the rectifier diode from 0V to VIN(max) |
| COSS | Average output capacitance of the switching MOSFET from 0V to VIN(max) |
| COUT | Output Capacitor |
| D(max) | Maximum steady state operating duty cycle |
| D(min) | Minimum steady state operating duty cycle |
| ESR(max) | Maximum allowable output capacitor ESR |
| fSW | Switching frequency |
| IBP | Output Current of BP regulator due to external loads |
| IDD | Switching quiescent current with no load on BP |
| ID(avg) | Average diode conduction current |
| ID(peak) | Peak diode conduction current |
| IIN(avg) | Average input current |
| IIN(rms) | Root mean squared (RMS) input current |
| IL(avg) | Average inductor current |
| IL(rms) | Root mean squared (RMS) inductor current |
| IL(peak) | Peak current in inductor |
| ILRIP(max) | Maximum allowable inductor ripple current |
| L(min) | Minimum inductor value to maintain desired ripple current |
| IOUT(max) | Maximum designed output current |
| IRMS(cin) | Root mean squared (RMS) current through the input capacitor |
| IRIPPLE | Inductor peak to peak ripple current |
| IQSW(rms) | Root mean squared current through the switching MOSFET |
| PCON | Power loss due to conduction through switching MOSFET |
| PD(max) | Maximum power dissipation in diode |
| RDS(on) | Drain to source resistance of the switching MOSFET when “ON” |
| PSW | Power loss due to switching |
| PREG | Power loss due to the internal regulator |
| VBP | Output Voltage of BP regulator |
| V(BR)R(min) | Minimum reverse breakdown voltage rating for rectifier diode |
| VFB | Regulated feedback voltage |
| VFD | Forward voltage drop across rectifier diode |
| VIN | Power stage input voltage |
| VOUT | Regulated output voltage |
| VRIPPLE(cap) | Peak-to-Peak ripple voltage due to ideal capacitor (ESR = 0?) |
| VRIPPLE(tot) | Maximum allowable peak-to-peak output ripple voltage |
11.2 Documentation Support
11.2.1 Related Documentation
These references, design tools and links to additional references, including design software, may be found at http:www.power.ti.com
- PowerPAD Thermally Enhanced Package Application Report, SLMA002
- PowerPAD™ Made Easy, SLMA004
- Under The Hood Of Low Voltage DC/DC Converters. SEM1500 Topic 5, 2002 Seminar Series, SLUP206
- Understanding Buck Power Stages in Switchmode Power Supplies, SLVA057
- Designing Stable Control Loops. SEM 1400, 2001 Seminar Series, SLUP173
11.3 Related Links
The table below lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy.
Table 5. Related Links
| PARTS | PRODUCT FOLDER | SAMPLE & BUY | TECHNICAL DOCUMENTS | TOOLS & SOFTWARE | SUPPORT & COMMUNITY |
|---|---|---|---|---|---|
| TPS54383 | Click here | Click here | Click here | Click here | Click here |
| TPS54386 | Click here | Click here | Click here | Click here | Click here |
11.4 Trademarks
PowerPAD is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.