Power Supply Units

Enable, inhibit, system reset and power fail controls

Remote voltage sense: VS1, VS2, VS3

Build to meet Military Standards MIL STD 704F, MIL STD 461F, MIL STD 810G

Technical Specifications

DC Input

28VDC Nominal I/P

18 to 36 VDC Range

MIL-STD-704 (A-F) Normal and Abnormal Steady State

MIL-STD-704(A-F) transients Up to 50V, 80V.

MIL-STD-704(A-F) Transients Under 18V and Starting transients.

DC Output Voltages & Current

VS1: 12V, up to 20A

VS2: 3.3V, up to 25A

VS3: 5V, up to 25A

12V_Aux: 12V, up to 2A

-12V_Aux: -12V, up to 1A

3.3V_Aux: 3.3V, up to 5A

Ripple and Noise

Typically, less than 100mVp-p.

Measured across a 0.1μF capacitor and 47μF/63V

With the Shortest Ground loop and PSU Connector End capacitor with on load at Input Voltage of 28VDC

Bandwidth Set limit of 20Mhz

Special Features

VITA 62 Compliant

Wide Input Range

Remote Senses (VS1,VS2&VS3)

Output short circuit Protection

DC I/P Reverse Polarity protection

Over temperature shutdown with auto-recovery

EMI filters included

I2C communication

EMI/EMC

Build to meet with MIL-STD 461F (CE101, CE102, CS101, CS114, CS115, CS116

Efficiency

Up to 80-85 % (At Full load room temperature)

Environmental

Design to Meet MIL-STD-810G

Temperature (Operating: –40°C to +85°C, Storage: –40°C to +100°C)

Altitude (3,000m (10,000feet) max)

Humidity (Up to 95% RH)

Fungus (As Per Mil Std 810G)

Shock (As Per Mil Std 810G )

Vibration (As Per Mil Std 810G )

Salt Fog (As Per Mil Std 810G)

Isolation

Input to Output: DC1500V or AC1,000V 1minute, Cut off current = 10mA

Input to Case Ground: DC1000V or AC1,000V 1minute, Cut off current = 10mA,

Output to Case Ground: DC1000V 1minute, Cut off current = 10mA,

Functions and Signals - According to VITA 62

Sl. No.	Signal Name	Type	Description
1	FAIL*	Output	Indicates to other modules in the system that a failure has occurred in one of the outputs. Please refer to Figure 2 This signal is referenced to SIGNAL RTN.
2	SYSRESET*	Output	Indicates to other modules in the system that all outputs are within their working level. Please refer to Figure 2 This signal is referenced to SIGNAL RTN.
3	INHIBIT*	Input	Controls power supply outputs. This signal in conjunction with INHIBIT controls the outputs Please refer to Table 1 and Figure 1 This signal is referenced to SIGNAL RTN
4	ENABLE*	Input	Controls power supply outputs. This signal in conjunction with INHIBIT controls the outputs. Please refer to Table 1 and Figure 1 This signal is referenced to SIGNAL RTN.
5	VOUT REMOTE SENSE	Input	The SENSE is used to achieve accurate load regulations at load terminals (this is done by connecting the pins directly to the load’s terminals).

Inhibit and Enable Functionality

INHIBIT*	Low	Low	High	High
ENABLE*	Low	High	Low	High
VS1,VS2,VS3,±12VAux	OFF	OFF	ON	OFF
+3.3VAux	ON	OFF	ON	OFF

I/O Connector Pin Details

Pin	Function	Description
P1	28VDC_RET	DC Input Voltage Return
P2	28VDC_POS	DC Input Voltage
LP1	Chassis GND	Chassis Gnd
A1	Status Signal	PSU Function Status Signal-1
B1	Status Signal	PSU Function Status Signal-3
C1,D1,A2	NC	Not Used
B2	FAIL	Indicates to other modules in the system that a failure has occurred in one of the outputs.
C2	INHIBIT	Input control signal as defined in VITA 62, referenced to SIGNAL_RETURN
D2	ENABLE	Input control signal as defined in VITA 62, referenced to SIGNAL_RETURN
A3	Status Signal	PSU Function Status Signal-2
B3	+12V_Aux	+12V auxiliary output voltage
C3,D3	NC	Not Used
A4	+3.3V_Aux	+3.3V auxiliary output voltage
B4	+3.3V_Aux	+3.3V auxiliary output voltage
C4	+3.3V_Aux	+3.3V auxiliary output voltage
D4	+3.3V_Aux	+3.3V auxiliary output voltage
A5,B5	NC	Not Used
C5	PSU_SCL	I2C Communication Bus for PSU Status-Spare
D5	PSU_SDA	I2C Communication Bus for PSU Status-Spare
A6	PSU_SCL1	I2C Communication Bus for PSU Status
B6	PSU_SDA1	I2C Communication Bus for PSU Status
C6	-12V_Aux	–12V auxiliary output voltage
D6	PSU_SYSRESET	Indicates to other modules in the system that all outputs are within their working level.
A7,B7,C7	NC	Not Used
D7	Signal_RTN	Ground pin for control signals
A8	VS1_S+/12V	VS1 sense, should be connected at point-of-load or on the backplane to corresponding voltage output
B8	VS2_S+/3.3V	VS2 sense, should be connected at point-of-load or on the backplane to corresponding voltage output
C8	VS3_S+/5V	VS3 sense, should be connected at point-of-load or on the backplane to corresponding voltage output
D8	Sense_RTN	Should be connected to Common output Ground Rtn at the connector
P3	P03/5V	+5V main output
P4	GND_RTN	Common output Ground Rtn
P5	GND_RTN	Common output Ground Rtn
LP2	P02/3.3V	+3.3V main output
P6	P01/12V	+12V main output

Block Diagram

Mechanical GA Drawing:

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95% Typical Efficiency

-55°C to 95°C Rail Operating Temperature

VITA 62 3U Form Factor

SMART Function

VITA 62 3U ISOLATED 350W 28VDC POWER SUPPLY

This 3U power supply works with 9Vto 36 VDC (28VDC nominal) input voltage and isolates the input voltage ground from the output voltage ground. The power supply is conduction cooled, uses polyphase technology on all voltage rails and can provide up to 350 watts. It is suitable for use in mission critical rugged applications

Intelligent power supplies integrate a microcontroller (MCU) for a fully programmable and flexible solution. Intelligent power conversion allows configuration and reconfiguration for different applications. With intelligent power conversion, the power supply becomes a platform solution for Vita 46.11 system management-based systems. The power supply can easily be reprogrammed to support different operating limits and control inputs.

Features

Parallel operating with multiple power supplies, all rails

Load sharing and balancing

Digital On/Off control for low standby power

Spread Spectrum Clocking of power supply stages

Possibility of external synchronization

Power supply sequencing and hot-swap control

Power supply history logging and fault management

Monitoring all input/output voltages, currents and power

Current fold back control

Automatic temperature drift compensation for all outputs

Efficiency calculations at any time

Communication via SMB/I2C (PMB)for Vita 46.11 system management

Collects data from temperature sensors for over temperature protection

Precision compensation of all output voltages using integrated 5ppm voltage reference

Overview
VITA Compliant	VITA62
Size	3U
Temp. Range	-55 +95 C
Input (AC or DC)	DC
Input Range (VDC)	9-40
Active EMI Filtering	YES
Efficiency (%, typ.)	95
# of outputs	6

FEATURES
Over-current Protection	YES
Over-voltage Protection	YES
Over-temperature Protection	YES
Current Sharing	VS1, VS2, VS3
Remote Sense	YES
Standard Control	YES, VITA62

OUTPUTS (Total output not to exceed 350W)
VS1, V@A	+12@10A
VS2, V@A	+3.3@25A
VS3, V@A	+5@30A
AUX, V@A	+3.3@4A
AUX, V@A	+12@1.5A
AUX, V@A	-12@1.5A

COMPLIANCE
MIL-STD-461	YES
MIL-STD-810G	YES
* ESD Protection	YES
* Shock	YES
* Vibration	YES
* Rapid Decompression	YES
Corrosion Resistance	YES
* Fungus Resistance	YES
* Altitude	YES
* Humidity	YES

INPUT CHARACTERISTICS
Parameter					Min	Typ	Max	Units	Notes
Absolute Maximum Ratings
Input Voltage
- Non-Operating					-60		60	V	Continuous
- Operating					-40		40	V	Continuous- Reverse input Protection
- Operating Transient Protection							50	v	100ms transient, square wave
Isolation Voltage							150	V
Operating Temperature					-40		85	c
Storage Temperature					-55		105	C
Electrical Characteristics
Input Voltage
- Continuous					9		40	V
- Transient					9		48	V	50V Transient for 100 ms
Under-Voltage Lockout					-55		105	C
- Turn-On Input Voltage Threshold					8.5	9	10	V

OUTPUT CHARACTERISTICS
Parameter							+12V	+5V	+3.3V	+3.3V aux	+12V aux	-12V aux	Notes
Output Voltage Set Point, V							12	5	3.3	3.3	+12	-12	Vin = 28V
- Drift -40 deg.C to 85degC +/-							0.01	0.01	0.01	0.01	0.01	0.01	Vin = 28V
Output Voltage Trim Range, V							12	5	3.3	3.3	+12	-12	Over Line/load/temp
							+/-10%	+/-10%	+/-10%	+/-10%	+/-10%	+/-10%	Over Line/load/temp
Output Voltage Ripple (pk-pk), mV							80	50	40	40	80	80	Full load with 1 uF + 10 uF tantalum capacitor
Operating Current Range, A							0-40	0-40	0-20	0-4	0-1.5	0-1.5
Over-Voltage Protection, V							13	6	3.6	3.6	13	13
Current Limit Inception, A							42	42	22	5	1.7	1.7
Current Limit Inception, A 42 42 22 5 1.7 1.7 Maximum Output Capacitance,mF							10	10	10	1	1	1

Block Diagram

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