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reference designLT8315

Analog Devices LT8315

560VIN Micropower No-Opto Isolated Flyback Converter with 630V/300mA Switch

Overview

TopologyFlyback Converter
Input voltage70-130 V
Output 112 V / 0.6 A

Description

In traditional isolated high voltage flyback converters, tight regulation is achieved using opto-couplers to transfer regulation information from the secondaryside reference circuitry to the primary side. The problem is that opto-couplers add significant complexity to isolated designs: there is propagation delay, aging, and gain variation, all of which complicate power supply loop compensation and can reduce reliability. Moreover, during start-up, either a bleeder resistor or high voltage start-up circuit is required to initially power up the IC. Unless an additional high voltage MOSFET is added to the start-up components, the bleeder resistor is a source of unwelcome power loss. The LT®8315 is a high voltage flyback converter with an integrated 630V/300mA switch. The LT8315 eliminates the need for an opto-coupler, complicated secondary-side reference circuitry, additional start-up components, and an external high voltage MOSFET.

Features

  • Wide Input Voltage Range: 18V to 560V
  • 630V/300mA Integrated Power Switch
  • No Opto-Isolator Required for Regulation
  • Quasi-Resonant Boundary Mode Operation
  • Constant-Current and Constant-Voltage Regulation
  • Low Ripple Light Load Burst ModeR Operation
  • Low Quiescent Current: 70μA
  • Programmable Current Limit and Soft-Start
  • TSSOP Package with High Voltage Spacing

Typical applications

  • Isolated Telecom, Automotive, Industrial, Medical Power Supplies, Isolated Off Line Housekeeping Power Supplies, Electric Vehicles and Battery Stacks

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
VIN
VOut1(V)
IOut1(A)
Vaux(V)
RDC 1(Ω)
RDC 2(Ω)
RDC 3(Ω)
fswitch(kHz)
L(mH)
NPRI : NSEC : NAUX
ISAT(mA)
VT(V (AC))
L(mm)
W(mm)
H(mm)
Mount
Size
SamplesAvailability & Sample
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7508111324
SPECWE-OLLT Offline Flyback Transformers, 99 - 269 V (AC), 12 V
Simu­lation
Availability
–
Downloads8 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-OLLT Offline Flyback Transformers
Input Voltage 99 - 269 V (AC)
Output Voltage 112 V
Output Current 11 A
Auxiliary Voltage12 V
DC Resistance 11.725 Ω
DC Resistance 20.037 Ω
DC Resistance 30.41 Ω
Switching Frequency 50
Inductance2.75 mH
Turns Ratio10:1:1 
Saturation Current500 mA
Insulation Test Voltage4000 V (AC)
Length22.25 mm
Width14.6 mm
Height23.24 mm
MountTHT 
SizeEE20/10/6 
–Check availability
7508111518
SPECWE-OLLT Offline Flyback Transformers, 99 - 269 V (AC), 48 V
Simu­lation
Availability
–
Downloads8 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-OLLT Offline Flyback Transformers
Input Voltage 99 - 269 V (AC)
Output Voltage 148 V
Output Current 10.3 A
Auxiliary Voltage12 V
DC Resistance 11.4 Ω
DC Resistance 20.425 Ω
DC Resistance 30.32 Ω
Switching Frequency 50
Inductance2.4 mH
Turns Ratio2.5:1:0.25 
Saturation Current490 mA
Insulation Test Voltage4000 V (AC)
Length22.25 mm
Width14.6 mm
Height23.24 mm
MountTHT 
SizeEE20/10/6 
–Check availability
750316022
SPECWE-OLLT Offline Flyback Transformers, 99 - 269 V (AC), 5 V
Simu­lation
Availability
–
Downloads8 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-OLLT Offline Flyback Transformers
Input Voltage 99 - 269 V (AC)
Output Voltage 15 V
Output Current 11.6 A
Auxiliary Voltage20 V
DC Resistance 14.55 Ω
DC Resistance 20.015 Ω
DC Resistance 30.695 Ω
Switching Frequency 100
Inductance3.3 mH
Turns Ratio24:1:4 
Saturation Current360 mA
Insulation Test Voltage1500 V (AC)
Length13.46 mm
Width17.75 mm
Height12.7 mm
MountSMT 
SizeEP13 
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