DC2358A: 5.6V @ 450mA & 5V @ 300mA, 4.5 ~ 40Vin, Isolated

Summary

DC2358A is a 2kV AC isolated flyback μModule DC/DC converter with LDO post regulator featuring the LTM8068. The demo circuit is designed for a 5.6V flyback output and a 5V post regulator output from a 4.5V to 40V input. The current capability of the 5.6V flyback output varies with input voltage from about 200mA at 4.5VIN to about 460mA at 40VIN. The current capability of the 5V LDO output is limited by either the current capability of VOUT1 minus VOUT1 loading or the 300mA current limit on the LDO post regulator itself. Chart 1 shows the maximum output current on VOUT1 when VOUT2 is not loaded, and VOUT2 when VOUT1 is unloaded. VOUT2 is the LDO post regulator from VOUT1.

The two-stage converter provides an isolated flyback output as well as a low-noise LDO output. Chart 2 shows the output noise spectrum on the flyback output and Chart 3 shows the output noise spectrum on the LDO output.

The LTM8068 data sheet gives complete description of the device, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 2358A

Specifications

Manufacturer	Analog Devices Inc.
Category	AC/DC and DC/DC Conversion
Sub-Category	DC/DC SMPS - Multi Output
Eval Board Part Number	505-DC2358A-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Step Up/Down
Outputs and Type	2 Isolated
Voltage Out: Highest Current First	5.6V, 5V
Current Out	450mA, 300mA
Voltage In	4.5 ~ 40 V
Efficiency @ Conditions	>75%, 5V in, 5V @ 50 ~ 200 mA >75%, 12V in, 5V @ 100 ~ 350 mA >70%, 36V in, 5V @ 350 ~ 500 mA >70%, 24V in, 5V @ 125 ~ 450 mA
Voltage Out Range	4.85 ~ 5.9 V
Features	Current Limit (Adj. or Fixed) Isolated DC/DC Converter LDO Regulator(s), On-Chip Light Load Mode Reverse Polarity Protection Soft Start
Switching Frequency	- Not Given
Standby Current [Typical]	3 µA
Quiescent Current [Typical]	- Not Given
Component Count + Extras	14 + 15
Internal Switch	Yes
Design Author	Linear Technology
Application / Target Market	Power: Industrial Power
Standby Current [Maximum]	- Not Given
Quiescent Current [Maximum]	7 mA
Main I.C. Base Part	LTM8068
Date Created By Author	2015-12
Date Added To Library	2019-06