LT1952

PRODUCTION

Single Switch Synchronous Forward Controller

Data Sheet Product Selection Table

Part Models: 12
1ku List Price: Starting From $4.36

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Part Details

Synchronous Rectifier Control for High Efficiency
Programmable Volt-Second Clamp
Output Power Levels from 25W to 500W
Low Current Start-Up
(LT1952: 460µA; V_IN On/Off = 14.25V/8.75V)
(LT1952-1: 400µA; V_IN On/Off = 7.75V/6.5V)
True PWM Soft-Start
Low Stress Short Circuit Protection
Precision 107mV Current Limit Threshold
Adjustable Delay for Synchronous Timing
Accurate Shutdown Threshold with Programmable Hysteresis
Programmable Slope Compensation
Programmable Leading Edge Blanking
Programmable Frequency (100kHz to 500kHz)
Synchronizable to an External Clock up to 1.5 • f_OSC
Internal 1.23V Reference
2.5V External Reference
Current Mode Control
Small 16-Pin SSOP Package

Part Models: 12
1ku List Price: Starting From $4.36

Documentation

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
LT1952EGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952EGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952EGN-1#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952EGN-1#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952IGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952IGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952IGN-1#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952IGN-1#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952MPGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952MPGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952MPGN-1#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT1952MPGN-1#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LT1952EGN#PBF	PRODUCTION
LT1952EGN#TRPBF	PRODUCTION
LT1952EGN-1#PBF	PRODUCTION
LT1952EGN-1#TRPBF	PRODUCTION
LT1952IGN#PBF	PRODUCTION
LT1952IGN#TRPBF	PRODUCTION
LT1952IGN-1#PBF	PRODUCTION
LT1952IGN-1#TRPBF	PRODUCTION
LT1952MPGN#PBF	PRODUCTION
LT1952MPGN#TRPBF	PRODUCTION
LT1952MPGN-1#PBF	PRODUCTION
LT1952MPGN-1#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package
		PCN22_0235_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT1952EGN#PBF	PRODUCTION
LT1952EGN#TRPBF	PRODUCTION
LT1952EGN-1#PBF	PRODUCTION
LT1952EGN-1#TRPBF	PRODUCTION
LT1952IGN#PBF	PRODUCTION
LT1952IGN#TRPBF	PRODUCTION
LT1952IGN-1#PBF	PRODUCTION
LT1952IGN-1#TRPBF	PRODUCTION
LT1952MPGN#PBF	PRODUCTION
LT1952MPGN#TRPBF	PRODUCTION
LT1952MPGN-1#PBF	PRODUCTION
LT1952MPGN-1#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG]
		PCN22_0066_Form Material_Report Delta Qualification Matrix
LT1952EGN#PBF	PRODUCTION
LT1952EGN#TRPBF	PRODUCTION
LT1952EGN-1#PBF	PRODUCTION
LT1952EGN-1#TRPBF	PRODUCTION
LT1952IGN#PBF	PRODUCTION
LT1952IGN#TRPBF	PRODUCTION
LT1952IGN-1#PBF	PRODUCTION
LT1952IGN-1#TRPBF	PRODUCTION
LT1952MPGN#PBF	PRODUCTION
LT1952MPGN#TRPBF	PRODUCTION
LT1952MPGN-1#PBF	PRODUCTION
LT1952MPGN-1#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
High Voltage Hot Swap Controllers 1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode

Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

LT1952
LT1952-1

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

LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=9V-36V VOUT=12V @ 5A

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Product Details

Demonstration circuit 1317A-G is an isolated input to high current output 1/8th brick footprint synchronous forward converter featuring the LT1952 switching controller with Active Reset circuit. The Active Reset circuit can improve the efficiency in wide input voltage applications. Also, the Active Reset allows the implementation of self-driven synchronous secondary rectifiers in some applications. The DC1317A-G converts an isolated 9V to 36V input to 12V at 5A of output current.

Resources

DC1317A-G - Schematic
49.00K

DC1317A-G - Design Files
3.00M

DC1317A-G - Demo Manual
3.00M

LT1952EGN-1 | 48VIN to 3.3V, 40A Isolated Quarter Brick Telecom DC/DC Converter

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Product Details

DC830A: Demo Board for the LT1952 Single Switch Synchronous Forward Controller.

Resources

DC830A - Demo Manual
741.00K

DC830A - Schematic
46.00K

DC830A - Design File
0.00K

LT1952-1 Isolated Demo Board | Sync Forward Controller, Active Reset, 9V ≤ VIN ≤ 36V, 48V @1.5A

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Product Details

Demonstration circuit 1317A-H is isolated input to high current output 1/8th Brick footprint converter featuring the LT1952 switching controller with Active Reset circuit. The Active Reset circuit can improve the efficiency in wide input voltage applications. Also, the Active Reset allows the implementation of self-driven synchronous secondary rectifiers in some applications. The DC1317A-H converts isolated 9V to 36V input to 48V output and provides 1.5A of output current.

Resources

DC1317A-H - Design Files
1.00M

DC1317A-H - Schematic
66.00K

DC1317A-H - Demo Manual
613.00K

LT1952EGN-1 Active Reset Demo Board | VIN=18V-72V VOUT=24V @ 5A

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Product Details

DC1317A-D: Demo Board for LT1952 Single Switch Synchronous Forward Controller.

Resources

DC1317A-D - Demo Manual
1.00M

DC1317A-D - Design Files
2.00M

DC1317A-D - Schematic
50.00K

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 18V-36V, VOUT = 5V @ 20A

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Product Details

DC968A-B Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

Resources

DC968A-B - Design Files
1.00M

DC968A-B - Schematic
51.00K

DC968A-B - Demo Manual
1.00M

OBSOLETE: LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 12V @ 12A

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Product Details

This evaluation board is obsolete and no longer recommended. The replacement board is the DC1317A-C.

DC968A-C Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

Resources

DC968A-C - Demo Manual
1.00M

DC968A-C - Schematic
51.00K

DC968A-C Design Files
1.00M

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 34V-75V VOUT = 3.3V @ 30A

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Product Details

DC968A-A Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

Resources

DC968A-A - Design Files
1.00M

DC968A-A - Schematic
51.00K

DC968A-A - Demo Manual
2.00M

LT1952EGN-1, LTC3900CS8, LT4430ES6 Demo Board | VIN = 36V-75V, VOUT = 28V @ 4A

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Product Details

DC968A-D Demo Board for:
LT1952 Single Switch Synchronous Forward Controller
LTC3900 Synchronous Rectifier Driver for Forward Converters
LT4430 Secondary-Side Optocoupler Driver

Resources

DC968A-D - Design Files
1.00M

DC968A-D - Schematic
51.00K

DC968A-D - Demo Manual
1.00M

LT1952EGN-1 Active Reset Demo Board | VIN = 34V - 75V VOUT = 3.3V @ 35A

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Product Details

DC1317A-A: Demo Board for LT1952 Single Switch Synchronous Forward Controller.

Resources

DC1317A-A - Schematic
54.00K

DC1317A-A - Demo Manual
1.00M

DC1317A-A - Design File
1.00M

LT1952EGN-1 Active Reset Demo Board | VIN = 18V-72V VOUT = 5V @ 25A

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Product Details

DC1317A-B: Demo Board for LT1952 Single Switch Synchronous Forward Controller.

Resources

DC1317A-B - Schematic
54.00K

DC1317A-B - Demo Manual
748.00K

DC1317A-B - Design File
1.00M

LT1952EGN-1 Active Reset Demo Board | VIN=18V-72V VOUT=5V @ 12A

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Product Details

DC1317A-E: Demo Board for LT1952 Single Switch Synchronous Forward Controller.

Resources

DC1317A-E - Demo Manual
1.00M

DC1317A-E - Schematic
54.00K

DC1317A-E - Design File
1.00M

LT1952EGN-1/LTC3900 Demo Board | Active Reset, VIN=18V-72V VOUT=12V @ 10A

Buy Now View Details

Product Details

Demonstration circuit 1317A-C is isolated input to high current output 1/8th brick footprint synchronous forward converter featuring the LT1952 switching controller with Active Reset circuit. The Active Reset circuit can improve the efficiency in wide input voltage applications. Also, the Active Reset allows the implementation of self-driven synchronous secondary rectifiers in some applications. The DC1317A-C converts isolated 18V to 72V input to 12V output and provides over 12A of output current depending on cooling.

When determining the cooling requirements the actual input voltage range and continuous maximum output current must be taken into account. The converter operates at 300kHz with the peak efficiency greater than 94%. The DC1317 can be easily modified to generate output voltages in the range from 0.6V to 48V. The output currents are limited by total output power of up to 150W.