SNVS714F April 2011 – August 2015 LM25117 , LM25117-Q1
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 High Voltage Startup Regulator and VCC Disable
- 7.3.2 UVLO
- 7.3.3 Oscillator And Sync Capability
- 7.3.4 Ramp Generator and Emulated Current Sense
- 7.3.5 Error Amplifier and PWM Comparator
- 7.3.6 Soft-Start
- 7.3.7 Cycle-By-Cycle Current Limit
- 7.3.8 Hiccup Mode Current Limiting
- 7.3.9 HO and LO Drivers
- 7.3.10 Current Monitor
- 7.3.11 Maximum Duty Cycle
- 7.3.12 Thermal Protection
- 7.4 Device Functional Modes
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8 Application and Implementation
- 8.1 Application Information
- 8.2 Typical Applications
- 8.3
Detailed Design Procedure
- 8.3.1 Feedback Compensation
- 8.3.2 Sub-Harmonic Oscillation
- 8.3.3 Design Requirements
- 8.3.4 Timing Resistor RT
- 8.3.5 Output Inductor LO
- 8.3.6 Diode Emulation Function
- 8.3.7 Current Sense Resistor RS
- 8.3.8 Current Sense Filter RCS and CCS
- 8.3.9 Ramp Resistor RRAMP and Ramp Capacitor CRAMP
- 8.3.10 UVLO Divider RUV2, RUV1 and CFT
- 8.3.11 VCC Disable and External VCC Supply
- 8.3.12 Power Switches QH and QL
- 8.3.13 Snubber Components RSNB and CSNB
- 8.3.14 Bootstrap Capacitor CHB and Bootstrap Diode DHB
- 8.3.15 VCC Capacitor CVCC
- 8.3.16 Output Capacitor CO
- 8.3.17 Input Capacitor CIN
- 8.3.18 VIN Filter RVIN, CVIN
- 8.3.19 Soft-Start Capacitor CSS
- 8.3.20 Restart Capacitor CRES
- 8.3.21 Output Voltage Divider RFB2 and RFB1
- 8.3.22 Loop Compensation Components CCOMP, RCOMP and CHF
- 8.4 Application Curves
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
封裝選項
機械數據 (封裝 | 引腳)
散熱焊盤機械數據 (封裝 | 引腳)
訂購信息
11 Device and Documentation Support
11.1 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use.
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TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers.
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Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support.
11.2 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 2. Related Links
| PARTS | PRODUCT FOLDER | SAMPLE & BUY | TECHNICAL DOCUMENTS | TOOLS & SOFTWARE | SUPPORT & COMMUNITY |
|---|---|---|---|---|---|
| LM25117 | Click here | Click here | Click here | Click here | Click here |
| LM25117-Q1 | Click here | Click here | Click here | Click here | Click here |
11.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 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.
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.