Datasheet LT3753 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Active Clamp Synchronous Forward Controller |
| Pages / Page | 36 / 1 — FEATURES. DESCRIPTION. Input Voltage Range: 8.5V to 100V. Programmable … |
| Revision | B |
| File Format / Size | PDF / 1.7 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. Input Voltage Range: 8.5V to 100V. Programmable Volt-Second Clamp
Model Line for this Datasheet
Text Version of Document
LT3753 Active Clamp Synchronous Forward Controller
FEATURES DESCRIPTION
n
Input Voltage Range: 8.5V to 100V
The LT®3753 is a current mode PWM controller optimized n
Programmable Volt-Second Clamp
for an active clamp forward converter topology, allowing n
High Efficiency Control: Active Clamp,
up to 100V input operation.
Synchronous Rectification, Programmable Delays
A programmable volt-second clamp allows primary switch n Short-Circuit (Hiccup Mode) Overcurrent Protection duty cycles above 50% for high switch, transformer and n Programmable Soft-Start/Stop rectifier utilization. Active clamp control reduces switch n Programmable OVLO and UVLO with Hysteresis voltage stress and increases efficiency. A synchronous n Programmable Frequency (100kHz to 500kHz) output is available for controlling secondary side syn- n Synchronizable to an External Clock chronous rectification. The LT3753 is available in a 38-lead plastic TSSOP pack-
APPLICATIONS
age with missing pins for high voltage spacings. n Industrial, Automotive and Military Systems All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including XXXXX, XXXXX. n 48V Telecommunication Isolated Power Supplies
TYPICAL APPLICATION 36V to 72V, 5V/20A Active Clamp Isolated Forward Converter
VOUT VIN 9:2 5V 36V TO 72V 3.3µH • • 20A + 4.7µF 250V 100V 0.22µF 5Ω 560µF ×3 200Ω 5Ω 10V BSC0902NSI 68nF 47µF 100nF IRF6217 250V 10V 10k BSC0902NSI VIN AOUT OUT BSC190N15NS3 OC SYNC I 105k SENSEP 1k UVLO_VSEC 0.012Ω 100Ω 1.96k I V SENSEN OUT LT3753 OVLO 4.7nF 1.87k 1k SOUT 22µF INTVCC GND 1µF 10V V+ 100Ω 10V PS2801-1 LT1431 4.7µF 137k T AO T AS T OS T BLNK IVSEC RT SS1 SS2 FB COMP 25V GND-F REF 1µF GND-S 14.7k 30.1k 22nF 137k 44.2k 57.6k 1µF 100k COLL 100k 1k 2.2nF 3.3nF 34.8k 250V 3753 TA01 Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Input Voltage Range: 8.5V to 100V
The LT®3753 is a current mode PWM controller optimized n
Programmable Volt-Second Clamp
for an active clamp forward converter topology, allowing n
High Efficiency Control: Active Clamp,
up to 100V input operation.
Synchronous Rectification, Programmable Delays
A programmable volt-second clamp allows primary switch n Short-Circuit (Hiccup Mode) Overcurrent Protection duty cycles above 50% for high switch, transformer and n Programmable Soft-Start/Stop rectifier utilization. Active clamp control reduces switch n Programmable OVLO and UVLO with Hysteresis voltage stress and increases efficiency. A synchronous n Programmable Frequency (100kHz to 500kHz) output is available for controlling secondary side syn- n Synchronizable to an External Clock chronous rectification. The LT3753 is available in a 38-lead plastic TSSOP pack-
APPLICATIONS
age with missing pins for high voltage spacings. n Industrial, Automotive and Military Systems All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including XXXXX, XXXXX. n 48V Telecommunication Isolated Power Supplies
TYPICAL APPLICATION 36V to 72V, 5V/20A Active Clamp Isolated Forward Converter
VOUT VIN 9:2 5V 36V TO 72V 3.3µH • • 20A + 4.7µF 250V 100V 0.22µF 5Ω 560µF ×3 200Ω 5Ω 10V BSC0902NSI 68nF 47µF 100nF IRF6217 250V 10V 10k BSC0902NSI VIN AOUT OUT BSC190N15NS3 OC SYNC I 105k SENSEP 1k UVLO_VSEC 0.012Ω 100Ω 1.96k I V SENSEN OUT LT3753 OVLO 4.7nF 1.87k 1k SOUT 22µF INTVCC GND 1µF 10V V+ 100Ω 10V PS2801-1 LT1431 4.7µF 137k T AO T AS T OS T BLNK IVSEC RT SS1 SS2 FB COMP 25V GND-F REF 1µF GND-S 14.7k 30.1k 22nF 137k 44.2k 57.6k 1µF 100k COLL 100k 1k 2.2nF 3.3nF 34.8k 250V 3753 TA01 Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Package Description Revision History Typical Application Related Parts
