LT1950
PRODUCTIONSingle Switch PWM Controller with Auxiliary Boost Converter
- Part Models
- 4
- 1ku List Price
- Starting From $4.87
Overview
- Wide Input Range: 3V to 25V
- Programmable Volt-Second Clamp
- Output Power Levels from 25W to 500W
- Auxiliary Boost Converter Provides 10V Gate Drive from VIN as Low as 3V
- Programmable Operating Frequency (100kHz to 500kHz) with One External Resistor
- Programmable Slope Compensation
- Programmable Leading Edge Blanking
- ±2% Internal 1.23V Reference
- Accurate Shutdown Pin Threshold with Programmable Hysteresis
- 60ns Current Sense Delay
- 2.5V Auxiliary Reference Output
- Synchronizable to an External Clock up to 1.5 • fOSC
- Current Mode Control
- Small 16-Pin SSOP Package
The LT1950 is a wide input range, forward, boost, flyback and SEPIC controller that drives an N-channel power MOSFET with few external components required.
A resistor programmable duty cycle clamp can be used to generate a volt-second clamp for forward converter applications. An internal boost switcher is available for creating a separate supply for the output gate driver, allowing 10V gate drive from input voltages as low as 3V. The LT1950’s operating frequency can be set with an external resistor over a 100kHz to 500kHz range and a SYNC pin allows the part to be synchronized to an external clock. Additional programmability exists for leading edge blanking and slope compensation.
A fast current sense comparator achieves 60ns current sense delay and the error amplifier is a true voltage mode error amplifier, allowing a wide range of compensation networks. An accurate shutdown pin with programmable hysteresis is available for undervoltage lockout and shutdown. The LT1950 is available in a small 16-Pin SSOP package.
Applications
- Telecom Power Supplies
- Automotive Power Supplies
- Portable Electronic Equipment
- Isolated and Nonisolated DC/DC Converters
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT1950EGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1950EGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1950IGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LT1950IGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LT1950EGN#PBF | PRODUCTION | |
| LT1950EGN#TRPBF | PRODUCTION | |
| LT1950IGN#PBF | PRODUCTION | |
| LT1950IGN#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LT1950EGN#PBF | PRODUCTION | |
| LT1950EGN#TRPBF | PRODUCTION | |
| LT1950IGN#PBF | PRODUCTION | |
| LT1950IGN#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LT1950EGN#PBF | PRODUCTION | |
| LT1950EGN#TRPBF | PRODUCTION | |
| LT1950IGN#PBF | PRODUCTION | |
| LT1950IGN#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LT1950
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
LT1950EGN | Telecom High Efficiency, 36V to 72V Input, 3.3V @ 25A Output, Isolated DC/DC Converter