Analog Devices LT3798

Overview

Topology	Flyback Converter
IC revision	A

Description

The LT®3798 is a constant-voltage/constant-current isolatedflyback controller that combines active power factorcorrection (PFC) with no opto-coupler required for outputvoltage feedback into a single-stage converter. A LT3798based design can achieve a power factor of greater than 0.97by actively modulating the input current, allowing compliancewith most Harmonic Current Emission requirements.The LT3798 is well suited for a wide variety of off-lineapplications. The input range can be scaled up or down,depending mainly on the choice of external components.Efficiencies higher than 86% can be achieved with outputpower levels up to 100W. In addition, the LT3798 can easilybe designed into high DC input applications.

Features

Isolated PFC Flyback with Minimum Number ofExternal Components
VIN and VOUT Limited Only by External Components
Active Power Factor Correction
Low Harmonic Distortion
No Opto-Coupler Required
Constant-Current and Constant-Voltage Regulation
Accurate Regulated Voltage and Current (±5% Typical)
Energy Star Compliant (<0.5W No Load Operation)
Thermally Enhanced 16-lead MSOP Package

More information

Datasheet

Products

Order Code	Datasheet	Downloads	Status	Product series	V_IN (V)	V_Out1 (V)	I_Out1 (A)	V_aux (V)	R_{DC 1} (Ω)	R_{DC 2} (Ω)	R_{DC 3} (Ω)	R_{DC 4} (Ω)	f_switch (kHz)	L (µH)	N_PRI : N_SEC : N_AUX	I_SAT (A)	V_T (V (AC))	L (mm)	W (mm)	H (mm)	Mount	Size
750312872	SPEC	5 files CAD files ZIP 3D 3D_070-5455 (rev1).PDF \| 65.4 KB IGS 070-5455 (rev1).IGS \| 3.3 MB STP 070-5455 (rev1).STEP \| 1.5 MB Electric models ZIP LT 750312872_LTspice (rev1).zip \| 8.9 KB Others ZIP WRL 070-5455 (rev1).wrl \| 237 KB Download all 5 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	Transformer	20 - 60	28	4	24	0.011	0.035	0.011	–	50	14	1:1:0.8	25.9	1500	39.6	43.18	30.84	THT	ETD34
7508110210	SPEC	7 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP IGS 070-5449 (rev1).IGS \| 4.1 MB STP 070-5449 (rev1).STEP \| 1.7 MB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	85 - 141 V (AC)	11	0.35	15	5.1	0.092	1.35	–	100	2000	6.67:1:1.67	0.27	4500	15	15.75	18.5	THT	EE13/6/6
750813144	SPEC	7 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP IGS 070-5278 (rev1).IGS \| 3.2 MB STP 070-5278 (rev1).STEP \| 1.4 MB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	85 - 265 V (AC)	28	0.5	20	2.4	0.241	1.55	–	100	600	4:1:0.71	1.75	4500	18.5	16.5	18.8	THT	EE16/7/5
750811248	SPEC	8 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP 3D 3D_070-4869 (rev1).PDF \| 42.4 KB IGS 070-4869 (rev1).IGS \| 1.8 MB STP Download_STP_070-4869 (rev1).STEP \| 765.1 KB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	85 - 265 V (AC)	24	2	24	0.155	0.125	0.025	0.185	60 - 400	300	2:2:1:1	3.5	4500	31	31	25	THT	ER28/14
750811290	SPEC	8 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP 3D 3D_070-4869 (rev1).PDF \| 42.4 KB IGS 070-4869 (rev1).IGS \| 1.8 MB STP Download_STP_070-4869 (rev1).STEP \| 765.1 KB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	85 - 265 V (AC)	125	0.36	21.25	0.6	0.254	0.11	–	150	461	1:1:0.17	3.15	4500	31	31	25	THT	ER28/14
750811291	SPEC	8 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP 3D 3D_070-4869 (rev1).PDF \| 42.4 KB IGS 070-4869 (rev1).IGS \| 1.8 MB STP Download_STP_070-4869 (rev1).STEP \| 765.1 KB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	85 - 265 V (AC)	85	0.4	20	0.55	1.23	1.1	–	60	400	1:1:0.24	5.7	4500	31	31	25	THT	ER28/14
750811330	SPEC	8 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP 3D 3D_070-5455 (rev1).PDF \| 65.4 KB IGS 070-5455 (rev1).IGS \| 3.3 MB STP 070-5455 (rev1).STEP \| 1.5 MB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	85 - 265 V (AC)	18	5	18	0.15	0.008	0.042	–	200	300	6:1:1	4	4500	39.6	43.18	30.48	THT	ETD34
750813390	SPEC	8 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP 3D 3D_070-5455 (rev1).PDF \| 65.4 KB IGS 070-5455 (rev1).IGS \| 3.3 MB STP 070-5455 (rev1).STEP \| 1.5 MB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 8 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	85 - 265 V (AC)	90	1	19.8	0.15	0.223	0.055	–	75	100	1:1:0.22	9	4500	39.6	43.18	30.48	THT	ETD34
750813002	SPEC	7 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP IGS 070-5449 (rev1).IGS \| 4.1 MB STP 070-5449 (rev1).STEP \| 1.7 MB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	90 - 265 V (AC)	3.4	1	17	6.25	0.016	1.7	–	100	2000	20:1:5	0.35	4500	15	15.75	18.5	THT	EE13/6/6
750813134	SPEC	7 files EDA models: Components ZIP ALT Altium_WE-OLLT (rev24a).IntLib \| 2.6 MB CDS Cadence_WE-OLLT (rev24a).zip \| 5.5 MB EAG Eagle_WE-OLLT (rev24a).lbr \| 151.5 KB CAD files ZIP IGS 070-5278 (rev1).IGS \| 3.2 MB STP 070-5278 (rev1).STEP \| 1.4 MB Electric models ZIP LT LT Spice_WE-OLLT (rev24a).zip \| 19.1 KB PSP PSpice_WE-OLLT (rev24a).zip \| 12.4 KB Download all 7 files as zip archive ZIP	Active i\| Production is active. Expected lifetime: >10 years.	WE-OLLT Offline Flyback Transformers	90 - 265 V (AC)	14	1	18	1.85	0.06	1.35	–	100	600	8:1:1.29	1.75	4500	18	16.5	18	THT	EE16/7/5