Datasheet LT3752, LT3752-1 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller |
| Pages / Page | 52 / 1 — FEATURES. DESCRIPTION. Input Voltage Range: LT3752: 6.5V to 100V,. … |
| Revision | C |
| File Format / Size | PDF / 2.3 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. Input Voltage Range: LT3752: 6.5V to 100V,. LT3752-1:Limited Only by External Components
Model Line for this Datasheet
- LT3752EFE#PBF LT3752EFE#TRPBF LT3752EFE#WPBF LT3752EFE#WTRPBF LT3752EFE-1#PBF LT3752EFE-1#TRPBF LT3752EFE-1#WPBF LT3752EFE-1#WTRPBF LT3752HFE#PBF LT3752HFE#TRPBF LT3752HFE#WPBF LT3752HFE#WTRPBF LT3752HFE-1#PBF LT3752HFE-1#TRPBF LT3752HFE-1#WPBF LT3752HFE-1#WTRPBF LT3752HFE-2#WPBF LT3752HFE-2#WTRPBF LT3752IFE#PBF LT3752IFE#TRPBF LT3752IFE#WPBF LT3752IFE#WTRPBF LT3752IFE-1#PBF LT3752IFE-1#TRPBF LT3752IFE-1#WPBF LT3752IFE-1#WTRPBF LT3752MPFE#PBF LT3752MPFE#TRPBF LT3752MPFE-1#PBF LT3752MPFE-1#TRPBF
Text Version of Document
LT3752/LT3752-1 Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller
FEATURES DESCRIPTION
n
Input Voltage Range: LT3752: 6.5V to 100V,
The LT®3752/LT3752-1 are current mode PWM controllers
LT3752-1:Limited Only by External Components
optimized for an active clamp forward converter topology. n
Internal Housekeeping DC/DC Controller
A DC/DC housekeeping controller is included for improved n
Programmable Volt-Second Clamp
efficiency and performance. The LT3752 allows operation n
High Efficiency Control: Active Clamp,
up to 100V input and the LT3752-1 is optimized for ap-
Synchronous Rectification, Programmable Delays
plications with input voltages greater than 100V. n Short-Circuit (Hiccup Mode) Overcurrent Protection A programmable volt-second clamp allows primary switch n Programmable Soft-Start/Stop duty cycles above 50% for high switch, transformer and n Programmable OVLO and UVLO with Hysteresis rectifier utilization. Active clamp control reduces switch n Programmable Frequency (100kHz to 500kHz) voltage stress and increases efficiency. A synchronous n Synchronizable to an External Clock output is available for controlling secondary side syn- n AEC-Q100 Qualified for Automotive Applications chronous rectification.
APPLICATIONS
The LT3752/LT3752-1 are available in a 38-lead plastic n TSSOP package with missing pins for high voltage Offline and HV Car Battery Isolated Power Supplies n spacings. 48V Telecommunication Isolated Power Supplies 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.
TYPICAL APPLICATION 18V to 72V, 12V/12.5A, 150W Active Clamp Isolated Forward Converter
VOUT VIN 12V 18V TO 72V 6.8µH 4.7µF INTV 4:4 12.5A CC VAUX 100V • • 470µF + • • ×3 2.2µF 2.2µF 16V • ZVN4525E6 15nF 22µF Si2325DS BSC077N12NS3 100nF FDMS86101 16V ×2 499Ω 0.15Ω 10k 100Ω 100Ω BSC077N12NS3 VIN HOUT HISENSE AOUT OUT VAUX VIN OC FG 2.2µF F SW C G C SW CSN CSP SYNC I 100k 68pF SENSEP 100k GND 2k 100k UVLO_VSEC 0.006Ω LT8311 FB PGOOD 5.9k SYNC ISENSEN 11.3k LT3752 OVLO 220pF • • V CC 560Ω TO 1.82k OP INT PMODE TIMER SS COMP SOUT INTV INTV CC VAUX CC GND 220nF 10k 3.16k 100Ω 13.7k 68pF 4.7µF 4.7µF 499k T AO T AS T OS T BLNK IVSEC RT SS1 SS2 HCOMP FB COMP HFB 4.7nF 1.1k 1µF 22.6k 34k 31.6k 22nF 2.8k 3752 TA01 49.9k 7.32k 71.5k 0.33µF 22nF 100k 100k 1.2k 2.2nF EFFICIENCY: 94% AT 48VIN/10AOUT Rev. C 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 Order Information Electrical Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Input Voltage Range: LT3752: 6.5V to 100V,
The LT®3752/LT3752-1 are current mode PWM controllers
LT3752-1:Limited Only by External Components
optimized for an active clamp forward converter topology. n
Internal Housekeeping DC/DC Controller
A DC/DC housekeeping controller is included for improved n
Programmable Volt-Second Clamp
efficiency and performance. The LT3752 allows operation n
High Efficiency Control: Active Clamp,
up to 100V input and the LT3752-1 is optimized for ap-
Synchronous Rectification, Programmable Delays
plications with input voltages greater than 100V. n Short-Circuit (Hiccup Mode) Overcurrent Protection A programmable volt-second clamp allows primary switch n Programmable Soft-Start/Stop duty cycles above 50% for high switch, transformer and n Programmable OVLO and UVLO with Hysteresis rectifier utilization. Active clamp control reduces switch n Programmable Frequency (100kHz to 500kHz) voltage stress and increases efficiency. A synchronous n Synchronizable to an External Clock output is available for controlling secondary side syn- n AEC-Q100 Qualified for Automotive Applications chronous rectification.
APPLICATIONS
The LT3752/LT3752-1 are available in a 38-lead plastic n TSSOP package with missing pins for high voltage Offline and HV Car Battery Isolated Power Supplies n spacings. 48V Telecommunication Isolated Power Supplies 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.
TYPICAL APPLICATION 18V to 72V, 12V/12.5A, 150W Active Clamp Isolated Forward Converter
VOUT VIN 12V 18V TO 72V 6.8µH 4.7µF INTV 4:4 12.5A CC VAUX 100V • • 470µF + • • ×3 2.2µF 2.2µF 16V • ZVN4525E6 15nF 22µF Si2325DS BSC077N12NS3 100nF FDMS86101 16V ×2 499Ω 0.15Ω 10k 100Ω 100Ω BSC077N12NS3 VIN HOUT HISENSE AOUT OUT VAUX VIN OC FG 2.2µF F SW C G C SW CSN CSP SYNC I 100k 68pF SENSEP 100k GND 2k 100k UVLO_VSEC 0.006Ω LT8311 FB PGOOD 5.9k SYNC ISENSEN 11.3k LT3752 OVLO 220pF • • V CC 560Ω TO 1.82k OP INT PMODE TIMER SS COMP SOUT INTV INTV CC VAUX CC GND 220nF 10k 3.16k 100Ω 13.7k 68pF 4.7µF 4.7µF 499k T AO T AS T OS T BLNK IVSEC RT SS1 SS2 HCOMP FB COMP HFB 4.7nF 1.1k 1µF 22.6k 34k 31.6k 22nF 2.8k 3752 TA01 49.9k 7.32k 71.5k 0.33µF 22nF 100k 100k 1.2k 2.2nF EFFICIENCY: 94% AT 48VIN/10AOUT Rev. C 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 Order Information Electrical Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
