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LT8315 - 560VIN Micropower No-Opto Isolated Flyback Converter with 630V/300mA Switch

Datasheet

Documentation

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 Mode^® Operation
Low Quiescent Current: 70μA
Programmable Current Limit and Soft-Start
TSSOP Package with High-Voltage Spacing

Typical Application

Description

The LT®8315 is a high voltage flyback converter with integrated 630V/300mA switch. No opto-isolator is needed for regulation. The device samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer. Quasi-resonant boundary mode operation improves load regulation, reduces transformer size, and maintains high efficiency.

At start-up, the LT8315 charges its INTV_CC capacitor via a current source attached to the DRAIN pin. During normal operation, the current source turns off and the device draws its power from a third winding on the transformer.

The LT8315 operates from a wide range of input supply voltages and can deliver up to 15W of power. It is available in a thermally enhanced 20-pin TSSOP package with four pins removed for high-voltage spacing.

Packaging

TSSOP-20

Order Info

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*
LT8315HFE#PBF	TSSOP	20	H	$6.79	$4.75
LT8315EFE#TRPBF	TSSOP	20	E	$5.92	$4.16
LT8315IFE#PBF	TSSOP	20	I	$6.43	$4.50
LT8315EFE#PBF	TSSOP	20	E	$5.86	$4.10
LT8315HFE#TRPBF	TSSOP	20	H	$6.85	$4.81
LT8315IFE#TRPBF	TSSOP	20	I	$6.49	$4.56

^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number	Description	Price	Documentation
DC2337A	LT8315EFE Isolated Demo Board \| Offline Flyback, 90VAC ≤ VIN ≤ 265VAC, VOUT = 12V @ 0.55A	Contact Factory	Design File Manual Schematic