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Analog Devices LT3752-1
LT3752/LT3752-1 - Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller
Overview
| Topology | Flyback Converter |
| Input voltage | 75-180 V |
| Switching frequency | 100-500 kHz |
| IC revision | B |
Description
The LT®3752/LT3752-1 are current mode PWM controllers optimized for an active clamp forward converter topology. A DC/DC housekeeping controller is included for improved efficiency and performance. The LT3752 allows operation up to 100V input and the LT3752-1 is optimized for applications with input voltages greater than 100V.
A programmable volt-second clamp allows primary switch duty cycles above 50% for high switch, transformer and rectifier utilization. Active clamp control reduces switch voltage stress and increases efficiency. A synchronous output is available for controlling secondary side synchronous rectification.
The LT3752/LT3752-1 are available in a 38-lead plastic TSSOP package with missing pins for high voltage spacings.
Features
- Input Voltage Range: LT3752: 6.5V to 100V, LT3752-1:Limited Only by External Components
- Internal Housekeeping DC/DC Controller
- Programmable Volt-Second Clamp
- High Efficiency Control: Active Clamp, Synchronous Rectification, Programmable Delays
- Short-Circuit (Hiccup Mode) Overcurrent Protection
- Programmable Soft-Start/Stop
- Programmable OVLO and UVLO with Hysteresis
- Programmable Frequency (100kHz to 500kHz)
- Synchronizable to an External Clock
Typical applications
- Offline and HV Car Battery Isolated Power Supplies
- Industrial, Automotive and Military Systems
- 48V Telecommunication Isolated Power Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Wire Type | VIN | VOut1(V) | IOut1(mA) | Vaux(V) | ISAT(A) | VT(V (AC)) | fswitch(kHz) | NPRI : NSEC : NAUX | L(mm) | W(mm) | H(mm) | Mount | Size | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-HCF SMT High Current Inductor, 15 µH, 15.4 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance15 µH | Performance Rated Current15.4 A | Saturation Current @ 10%19 A | Saturation Current @ 30%21 A | DC Resistance9.57 mΩ | Self Resonant Frequency12.8 MHz | Wire TypeFlat | – | – | – | – | Saturation Current21 A | – | – | – | Length20.8 mm | Width20.5 mm | Height13.5 mm | MountSMT | Size2013 | –Check availability | |||
 | SPECWE-OLSTM Offline Flyback Transformers, 1600 µH, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLSTM Offline Flyback Transformers | Inductance1600 µH | – | – | – | – | – | – | Input Voltage 85 - 424 V (AC) | Output Voltage 112 V | Output Current 1500 mA | Auxiliary Voltage16 V | Saturation Current0.34 A | Insulation Test Voltage4000 V (AC) | Switching Frequency 115 | Turns Ratio8:1:1.33 | Length13.72 mm | Width20.45 mm | Height10.8 mm | MountTHT | SizeEE13/7/4 | –Check availability |
Availability Forecast
WE item number Packaging unitsLead time
––– weeks
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |
There is no forecast for this quantity request.
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