IC manufacturers Analog Devices
IC manufacturers (103)
- All manufacturers
Analog Devices
Infineon Technologies
Microchip
Onsemi
Renesas
ROHM
STMicroelectronics
Texas Instruments
- 3peak incorporated (28)
- Ablic (23)
- Acco Semiconductor (1)
- Advanced Power (4)
- Allegro Microsystems (100)
- Alpha & Omega Semiconductor (37)
- AnalogySemi (3)
- AnDAPT Inc (204)
- Anpec (13)
- AXElite (2)
- Backward (6)
- Bright Power Semiconductor (1)
- Broadcom (46)
- Cambridge GaN Devices (18)
- Chipanalog Micro (10)
- Cologne Chips (1)
- Convenient Power (1)
- Dialog Semiconductor (12)
- Diodes Incorporated (259)
- Divimath (8)
- Elmos AG (1)
- EPC (140)
- e-Peas Semiconductors (1)
- Eta Solutions Co. Ltd. (9)
- GaN Systems (8)
- GaNPower (3)
- Giantec (1)
- Gstek Wuxi (1)
- Helix Semiconductor (7)
- IKON (1)
- Indie Semiconductor (8)
- Innovision Semiconductor Inc (2)
- Intel (68)
- Inventchip Technology (3)
- ISSI (51)
- JoulWatt (20)
- KDPOF (3)
- Kinetic Technology (8)
- Lattice semiconductor Corporation (38)
- Littelfuse (1)
- Lumissil Microsystems (8)
- M3 Technology (M3Tek) (7)
- Macnica (22)
- Marvell Semiconductor (1)
- MaxLinear (181)
- Menlo Micro (1)
- MikroE (25)
- MindCet (2)
- Monolithic Power Systems (981)
- Navitas Semiconductor Inc (6)
- NewEdge Technologies, Inc. (1)
- Nexperia (267)
- Nisshinbo Micro Device Inc. (10)
- Novosense Micro (1)
- NXP (338)
- O2 Micro International Ltd (10)
- On Bright (7)
- Panasonic (2)
- PN Junction Semiconductor (2)
- Power Integrations (116)
- Powermat (1)
- Pulsiv (19)
- Qorvo (97)
- Realsil SuRealsil(tek) Microelectronics (1)
- Richtek (297)
- Sanken Electric Co., Ltd. (16)
- Sckipio (6)
- Semtech (86)
- SG-Micro (58)
- SiFive (2)
- Silanna Semiconductor (9)
- Silergy Corporation (34)
- Silicon Laboratory Inc. (108)
- Silicontent Technology (59)
- Silvertel (59)
- Skycore Semiconductors (1)
- Skyworks (33)
- Southchip (14)
- Summit Wireless (1)
- Tagore Tech (7)
- Taiwan Semiconductor (1)
- TDK Corporation (1)
- Tempo Semiconductor (1)
- Torex (37)
- Toshiba (27)
- Transphorm (21)
- TransSIP (2)
- Union (21)
- uPI Semiconductor (2)
- Valens Semiconductor (31)
- Wise Integration (3)
- Wolfspeed (23)
- Xilinx (22)
- XL Semiconductor (3)
- XYSemi (62)
Overview
| Topology | Flyback Converter |
| Input voltage | 3-40 V |
| Switching frequency | 1000 kHz |
Description
The LT®3574 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation. The part senses the isolated output voltage directly from theprimary side flyback waveform. A 0.65A, 60V NPN power switch is integrated along with all control logic into a 16‑lead MSOP package.The LT3574 operates with input supply voltages from 3V to 40V, and can deliver output power up to 3W with no external power switch. The LT3574 utilizes boundary mode operation to provide a small magnetic solution withimproved load regulation.The output voltage is easily set with two external resistors and the transformer turns ratio. Off-the-shelf transformers are available for many applications.
Features
- 3V to 40V Input Voltage Range
- 0.65A, 60V Integrated NPN Power Switch
- Boundary Mode Operation
- No Transformer Third Winding orOpto-Isolator Required for Regulation
- Improved Primary-Side Winding FeedbackLoad Regulation
- VOUT Set with Two External Resistors
- BIAS Pin for Internal Bias Supply and PowerNPN Driver
- Programmable Soft-Start
- Programmable Power Switch Current Limit
- 16-Lead MSOP PackageREMARKS:-REFERTable 5.Predesigned Transformers-Typical Specifications Unless Otherwise NotedPage no 11
Typical applications
- Industrial, Automotive and Medical Isolated
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1(V) | IOut1(A) | VOut2(V) | IOut2(A) | Vaux(V) | L(µH) | n | ISAT(A) | LS(µH) | VT(V (AC)) | Size | IC Reference | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 9 - 36 V (DC), 24 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 9 - 36 V (DC) | Output Voltage 124 V | Output Current 10.5 A | – | – | Auxiliary Voltage8 V | Inductance100 µH | Turns Ratio1:1:0.333 | Saturation Current2.1 A | Leakage Inductance3 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3574 & LT3575 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 10 - 30 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 10 - 30 V (DC) | Output Voltage 15 V | Output Current 11 A | – | – | Auxiliary Voltage5 V | Inductance50 µH | Turns Ratio3:1:1 | Saturation Current1.6 A | Leakage Inductance1 µH | Insulation Test Voltage1500 V (AC) | SizeEP7 | IC ReferenceLT3574 & LT3573 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 10 - 30 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 10 - 30 V (DC) | Output Voltage 15 V | Output Current 11 A | – | – | Auxiliary Voltage5 V | Inductance30 µH | Turns Ratio3:1:1 | Saturation Current1.7 A | Leakage Inductance1 µH | Insulation Test Voltage1500 V (AC) | SizeEP7 | IC ReferenceLT3574 & LT3573 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 10 - 30 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 10 - 30 V (DC) | Output Voltage 15 V | Output Current 11 A | – | – | Auxiliary Voltage5 V | Inductance30 µH | Turns Ratio3:1:1 | Saturation Current1.7 A | Leakage Inductance1 µH | Insulation Test Voltage1500 V (AC) | SizeEP7 | IC ReferenceLT3574 & LT3573 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 12 - 30 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 12 - 30 V (DC) | Output Voltage 15 V | Output Current 11 A | Output Voltage 2-5 V | Output Current 21 A | Auxiliary Voltage5 V | Inductance63 µH | Turns Ratio3:1:1:1 | Saturation Current1.45 A | Leakage Inductance0.6 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3574 & LT3573 & LT3575 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 24 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 124 V | Output Current 10.5 A | – | – | Auxiliary Voltage8 V | Inductance100 µH | Turns Ratio2:1:0.33 | Saturation Current1.9 A | Leakage Inductance3 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3574 & LT3575 | –Check availability | ||||
| SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 36 V (DC), 5 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Input Voltage 36 V (DC) | Output Voltage 15 V | Output Current 13 A | – | – | Auxiliary Voltage10 V | Inductance50 µH | Turns Ratio4:1:1.5 | Saturation Current2.4 A | Leakage Inductance1.5 µH | Insulation Test Voltage1500 V (AC) | SizeEP10 | IC ReferenceLT3574 & LT3575 | –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.
Does it just not fit? Please contact us.Simply contact our service team for special orders and bulk quantities.Contact us