MicroVerter® Series

High Reliability/COTS DC/DC Converters

	Miniature Size
	High Density - Up to 58 W/in.3
	Constant Frequency - 370KHz
	Parallelable with Current Sharing
	Fault Tolerant - n+m Redundancy
	Extremely Low Thermal Resistance

	Multiple Configurations Available
S=	Synchronization 330-400KHz
T=	-55°C to 100°C Operating Temperature
C=	Conformal Coating
E=	-55°C to 125°C Operating Temperature (Consult tech@astrodyne.com for output power rating)
RL=	No Pure Tin
LF=	RoHS Compliant
	(ex. UV28-2-STCRL)

UV 28 series

Input Specifications

Input Voltage (+In to -In), (Note 1)	28VDC ± 8VDC, 32VDC max.
Brownout	18VDC min. (75% full output)
In Rush Charge	2.6 x 10-4 Coulombs typ.
Input Reflected Ripple	20% typ. (full load, nominal line singles)
No Load Power Dissipation	1.5 watts typ.
Logic Disabled Power In	.35 watts typ.
Input Ripple Rejection	60dB @120Hz, typ.
Input Overvoltage	32VDC min, 60VDC max. (no damage to units)

General Specifications

Input/Output Isolation	1000VDC, min. (consult factory for procedure)
Input/Baseplat Isolation	1000VDC, min.
Output/Baseplate Isolation	200VDC, min.
Input-to-Output Capacitance	2200pF typ.

Environmental Specifications

Operating Temperature	-40°C to +100°C
Thermal Resistance Case to Ambient	4.2°C /w (single @ Tc=100°C )

Output Specifications

Watts	252 Watts
Output Voltage	See Selection Chart Above
Set Point Accuracy	±1% max.(no load)
Load Regulation	0.02% typ., 0.2% max (0 to Full Load)
Line Regulation	0.02% typ., 0.2% max. (Over Range)
Ripple	1.0 typ., 3.0% p-p (0 to 20MHz)
Output Power	See Selection Chart Above
Current Limit (auto. recovery)	110-120% typ. (full load)
Current Sharing	±5% typ. (full load)
Transient Response Singles	50µs typ. (20-80% load, 5A/µs, Vout 1%)
Transient Response Main Output Triples	200µs min. (10-20A, aux. loads 2.5A, .25A/µs, Vout 1%)
Transient Response Waveforms	See Website: www.roassoc.com
Temp Drift	.02%/°C max.
Trim Range	±10% min. (consult factory for extended range)
Remote Sense Compensation	0.5V max. (total)
Over voltage Protection (Non-Shutdown, Auto Recovery)	120% typ. (or Vout +5 whichever is greater)
Over Temperature Shut-Down	105°C ± 5°C (Case Temperature)
Turn-On Time	2.5 msec, typ. (input power aplied, Vout 1%)
Enable Current (Logic Off)*	1.0 mA, typ. (sink)
Turn-On Time*	1 msec, typ. (Vout within 1%)

Physical Specifications

Notes