MCD10060 Rev. 1.8, 23-Jul-10 Page 1 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
Applications
Telecom, datacom, and distributed power
systems
Features
RoHS compliant for all six substances
Universal input voltage range (36-75 VDC)
High power density, 15.15 Watts/cubic inch
1U or 2U height configurations
Active current share with ORing FETs
I
2C interface status and control
External standby voltage of 5 VDC @ 2 A
Overtemperature, overload, and overvoltage
protection
Status LEDs: INPUT OK, DC OK,
Overtemperature
Airflow direction from rear-to-front
Description
The FND850-12RG DC-DC front-end provides a 12 VDC output for telecom, datacom, and other distributed
power applications. The FND850-12RG small 1U by 2U size allows for configurations of either height in hot-
swap redundant systems while its internal fan and cooling design permits wide use with reliable operation.
Status is provided with front panel LEDs, logic signals, and via the I2C management interface bus. In addition,
the I2C bus can enable the power supply, control fan speed, and adjust the output voltage from 7 to 12 VDC.
This powerful feature allows the same power supply to be used in various applications.
In addition, the FND850-12RG is designed with airflow from the rear of the power supply to the front. This
airflow direction supports those critical applications where space limitations and/or higher ambient temperatures
near the rear of the racking system, prohibit the discharge of higher temperature airflow from regular front-to-rear
cooled power supplies.
The FND850-12RG meets international safety requirements and is CE marked to the Low Voltage Directive
(LVD).
Model Selection
Model Input
Voltage
(VDC)
Nominal
Output
Voltage
(VDC)
Adjustment
Range
(VDC)
Maximum
Output
Current
(Amps)
Line
Regulation
(%)
Load
Regulation
(%) 1
Ripple &
Noise
pk-pk % 2
FND850-12RG 36 to 44
44 to 75
36 to 75
12
12
5 (Standby)
7 to 12
7 to 12
N/A
58
71
2
±0.17
±0.17
±5
±0.8
±0.8
±5
1
1
1
1 % of Vnom
2 Maximum peak-to-peak noise is expressed as a percentage of output voltage; 20 MHz bandwidth.
Input Specifications
Parameter Conditions/Description Min. Nom. Max. Units
Input Voltage DC input voltage 36 75 VDC
Hold-up Time After DC input; removing at full power 4 5 ms
Input Current At 100% load (main and standby output) ,
Vin = 36 VDC 23.5 A rms
Inrush Surge Current Internally limited. Vin = 36 VDC @ 25 ºC 35 A pk
Internally limited. Vin = 75 VDC @ 25 °C 25
MCD10060 Rev. 1.8, 23-Jul-10 Page 2 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
Output Specifications
Parameter Conditions/Description Min. Nom. Max. Units
Efficiency Full rated load at Vin = 36 to 75 VDC,
Vout = 12V 84
80
88
82
%
Full rated load at Vin = 36 to 75 VDC,
Vout = 7V
Minimum Load Minimum loading required to maintain regulation. 0 A
Output Current Main output: Vin = 36 to 44 VDC 58
71 A rms
Main output: Vin = 44 to 75 VDC
Nominal Output
Power
12V output, Vin = 36 to 44 VDC (power derating)
700
850
10
W
12V output, Vin = 44 to 75 VDC
Standby output Vin = 36 to 75 VDC
Overshoot Output voltage overshoot at turn-on. 3 %
Transient Response
Maximum recovery time and deviation of initial
set point due to a 50% load change, 1A/µs.
Maximum recovery time: 12V output
Maximum deviation: 12V output
Maximum recovery time and deviation of initial
set point due to a 100% load change, 1A/µs.
Maximum recovery time: 12V output
Maximum deviation: 12V output
1200
2
2
4
µs
%
ms
%
Turn-On Delay Time required for initial output voltage
stabilization after application of DC input. 2 Sec
Output Regulation See Model Selection table on page 1.
MCD10060 Rev. 1.8, 23-Jul-10 Page 3 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
Interface Signals and Internal Protection
Parameter Conditions/Description Min. Nom. Max. Units
Overvoltage Protection
Latch-style overvoltage protection.
Output adjusted to 12V:
Output adjusted to 7V:
14.36
8.8
15.65
9.2
V
Overcurrent Protection
Current limit. 12V output (Vin = 44 to 75V)
12V output (Vin = 36 to 44V)
Standby output:
74
61
2.2
78
64
85
70
4
A
Short-Circuit
Protection
Power supply to recover when short is removed.
Overtemperature/
Fan Failure Warning
12V output will shut down in the event of an
overtemperature condition or blocked fan rotor.
Supply's fan and Vaux are active. Power
supply will recover when OT condition is
removed. Amber OT LED will turn ON to
indicate fault condition.
OT/Fan Fail is an open-collector signal with
20-mA pull-down. High signal indicates a
normal operating condition. Output will go low
at least 100 ms before OT condition shuts down
the power supply. An amber light will indicate
FF
DC OK
TTL open-collector signal with active 20-mA
pull-down. Represents percent of output voltage
where signal is OK. Below this voltage, a signal
high condition indicates an output which is out
of tolerance. Green DC OK LED on front panel
indicates normal operation. 1
90 110 %
Input Power Fail
Warning
TTL open-collector signal with active 20-mA
pull-down. High indicates an input power fail.
Power Fail Warning will turn OFF green INPUT
OK LED. Represents the time after warning
signal before Vout drops to 95% due to loss of
input power. 1
4 ms
Power Supply Present
Signal
Resistance of connection to logic ground which
allows user to determine if power supply is
present. 1
10 Ω
Current Share Main output only. Difference in current between
two supplies (IΔ < 5% Isum_nom) 7.1 A
Remote Sense Total voltage compensation for cable losses
with respect to the main output. 0.5 V
Output Enable
Open circuit or logic high from ENA pin to Vo1
RTN shuts OFF Vo1; Vaux and fan are
operational. Logic low (2 mA sink capability) or
jumper will turn ON Vo1 within 100 ms. Open
circuit voltage on enable pin is 3.3 VDC.
Externally applied voltage to the enable pin
should NOT exceed 7 VDC. Signal is referred
to as Logic Return (LRTN).
1 Also available on I2C data line.
MCD10060 Rev. 1.8, 23-Jul-10 Page 4 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
I2C Bus Management Interface1
Static Includes static information such as: part number and revision level, output rating, serial number,
date code, and manufacturing location.
Status (Logic 1 or 0) Power Supply OK.
Input OK.
DC Output OK.
Power Supply Seated.
Overtemperature.
Overcurrent.
Fan OK.
Real-Time Monitoring Output voltage (main output) 0.01V LSD.
Output current (main output) 0.1A LSD.
I2C monitor signal
accuracy at 25°C
Output voltage measurement (main output)
Output current measurement (main output)
0.05
1
V
A
Control Signals
(Logic 1 or 0)
Enable for main output.
Fan speed level.
I2C setting Output voltage setting resolution (main output)
Output current setting resolution (main output)
0.0154
0.5
V
A
1 Reference "I2C Management Interface" and "EEPROM Table of Contents" documents for FND850-12RD (consult factory).
Safety, Regulatory, and EMI Specifications
Parameter Conditions/Description Min. Nom. Max. Units
Agency Approvals UL60950, (UL) CSA 60950 (cUL), EN60950 (TÜV), CE Mark for LVD.
Electromagnetic
Interference
FCC CFR title 47 Part 15 Sub-Part B, EN55022/
CISPR 22 Conducted:
Radiated:
Level B
Level A
Voltage Fluctuation Unit must start up Pass
ESD Susceptability Per EN61000-4-2, Level 4. contact 8 . kV
Per EN61000-4-2, Level 4. air 15 kV
Radiated
Susceptability Per EN 61000-4-3, Level 3. 10 . V/M
EFT/Burst Per EN 61000-4-4, Level 4. ± 2 . kV
Input Transient
Protection
Per EN 61000-4-5, Class Line-to-Line:
Line-to-Ground:
± 0.5
± 0.5 . kV
RF Conducted
Disturbances Per EN 61000-4-6, Level 3. 1 10 . V
Leakage Current Per EN60950. At 36 VDC: 3.5 mA
1 RF Conducted disturbances value to be provided.
MCD10060 Rev. 1.8, 23-Jul-10 Page 5 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
Environ mental Specifi cations
Parameter Conditions/Description Min. Nom. Max. Units
Altitude Operating.
Non-Operating.
10K
40K ASL ft
Operating
Temperature
Internal DC fan for cooling. At 100% load: 1
At 50% load:
0
0
50
70
ºC
Storage Temperature -40 85 ºC
Temperature
Coefficient 0 ºC to 70 ºC (after 15-minute warm-up). 0.02 %/ºC
Relative Humidity Non-condensing (operational) 90 %RH
Non-condensing (non operational) 95 %RH
Shock Operating: half-sine, 10 ms, 3-axis.
Non-Operating: half-sine, 10 ms, 3-axis.
+20
+40
Gpk
Vibration Operating: swept sine 5-2000-5 Hz, 5-32 Hz,
0.02îDA, 32-2000 Hz.
Non-operating: random 10-2000 Hz.
1
6.16
Gpk
Grms
1 At temperature over 50°C – linear power derating to 50% of rated load up to 70°C
Reliability
Parameter Conditions/Description Min. Nom. Max. Units
MTBF (Calculated) MILHDBK 217F Ground Benign.
Useful Life.
100 000
7
hrs
yrs
MCD10060 Rev. 1.8, 23-Jul-10 Page 6 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
Mechanical Drawings
FRONT VIEW
REAR VIEW
MCD10060 Rev. 1.8, 23-Jul-10 Page 7 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
TOP VIEW
Front
Rear
TOP
MCD10060 Rev. 1.8, 23-Jul-10 Page 8 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
FND850-12RG SIDE VIEW
Connector Information
Power Supply:
Input - Anderson Power Products (APP): PP45 Powerpole Connector family
Output – FCI PoweBlade family connector: P/N 51732-020LF
Mating Connections:
Input – Anderson Power connector: PP45 Powerpole Connector family
45A crimp contact AWG# 10/14 3x: P/N 261G2-LPBK
Flexible Conduit Hardware Pak 1x: P/N 110G10
Housing red 1x: P/N 1327
Housing green 1x: P/N 1327G5
Housing black 1x: P/N 1327G6
Red long spacer 1x: P/N 1399G2
Output – FCI PoweBlade family connector: P/N: 51742-10602000AALF (Backplane – straight pins)
FCI PoweBlade family connector: P/N: 51762-10602000AALF (Right Angle)
Input connector
MCD10060 Rev. 1.8, 23-Jul-10 Page 9 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
Input Location
Chassis (Safety/EMI) Ground Green
+ DC input voltage Red
- DC input voltage Black
Output Connector Pin Assignments
MCD10060 Rev. 1.8, 23-Jul-10 Page 10 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
FND850-12RG Signal/Pin/Ground Reference Information
Signal Pin Location Ground Reference
OverTemperature / Fan Fail U1 Logic Ground (LRTN)
DC Input Fail Warning U2 Logic Ground (LRTN)
Power Supply Present U3 Logic Ground (LRTN)
Output Voltage Fault U4 Logic Ground (LRTN)
Internal Ground U5 Internal Ground (SRTN1)
ADDR0, I2C Address Bus T1 Internal Ground (SRTN)
ADDR1, I2C Address Bus T2 Internal Ground (SRTN)
ADDR2, I2C Address Bus T3 Internal Ground (SRTN)
ADDR3, I2C Address Bus T4 Internal Ground (SRTN)
ADDR4, I2C Address Bus T5 Internal Ground (SRTN)
DATA, I2C Data Line S1 Logic Ground (LRTN)
CLOCK, I2C Clock Line S2 Logic Ground (LRTN)
Auxiliary Power +5V S3 Aux Ground
Auxiliary Power Ground S4 Aux Ground
Logic Ground S5 Logic Ground (LRTN2)
Output Enable3 R1 Logic Ground (LRTN)
Vsense+ R2 Vsense-
Vsense- R3 Vsense-
Output Margin R4 Internal Ground (SRTN)
Active Current Sharing R5 Internal Ground (SRTN)
Vout+ P1, P2, P3 Vsense-
Vout- P4, P5, P6 Vsense-
1 SRTN (Signal Return) is internally connected with Vout-
2 LRTN (Logic Return) 10R resistor internal connected to Aux Ground
3 Short pin length
MCD10060 Rev. 1.8, 23-Jul-10 Page 11 of 11 www.power-one.com
FND850-12RG Front-End Preliminary Data Sheet
DC Input, 12V Output, 850 Watts
FND850-12RG locking system
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical
components in life support systems, equipment used in hazardous environments, or nuclear control systems without the express written
consent of the respective divisional president of Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on
the date manufactured. Specifications are subject to change without notice.
