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ISOLATED DC/DC CONVERTERS  
48V Input 3.3V/25A, 5V/20A, 12V/8.33A Output, 1/8 Brick  
07CY-85T Series  
PRELIMINARY  
Isolated  
Output Over Voltage Shutdown  
High Efficiency  
OCP/SCP  
High Power Density  
Excellent Thermal Performance  
Low Cost  
Over Temperature Protection  
Remote On/Off  
Output Voltage Trim  
Positive/Negative Remote Sense  
Input Under Voltage Lockout  
Description  
The 07CY-85T Series are isolated DC/DC converters that operate from a nominal 48V source. These units  
provide up to 100W of output power. These units are designed to be highly efficient and cost-effective.  
Features include remote on/off, short circuit protection, over current protection, over temperature protection,  
input under voltage lockout, and output over voltage protection. These converters are provided in a compact, 1/8  
brick industry standard package.  
Part Selection  
Output  
Voltage  
12.0V  
5.0V  
Input  
Max. Output  
Current  
8.33A  
Max. Output  
Power  
100W  
Typical  
Efficiency  
90%  
Model Number  
Active High  
07CY-85T120  
07CY-85T050  
07CY-85T033  
Model Number  
Active Low  
07CY-85T12L  
07CY-85T05L  
07CY-85T03L  
Voltage  
36V – 75V  
36V – 75V  
36V – 75V  
20A  
25A  
100W  
85W  
90%  
89%  
3.3V  
Note: Add “G” suffix at the end of the model number to indicate Tray Packaging.  
Absolute Maximum Ratings  
Parameter  
Input Voltage (continuous)  
Remote On/Off  
Min  
-0.3V  
-0.3V  
-
-40°C  
-55°C  
Typ  
Max  
80V  
18V  
2000V  
85°C  
125°C  
Notes  
-
-
-
-
-
I/O Isolation Voltage  
Ambient Temperature  
Storage Temperature  
Input Specifications  
Parameter  
Min  
Typ  
Max  
Notes  
Input Voltage  
36V  
48V  
75V  
Input Current (full load)  
Vo=12.0V  
Vo=5.0V  
Vo=3.3V  
-
-
-
-
-
-
-
3.0A  
3.0A  
2.8A  
Input Current (no load)  
80mA  
120mA  
Remote Off Input Current  
2mA  
5mA  
Tested with simulated source impedance  
of 10uH, 5Hz to 20MHz; use a  
100uF/100V electrolytic capacitor with  
Input Reflected Ripple Current (pk-pk)  
-
-
12mA  
24mA  
Input Reflected Ripple Current (RMS)  
2mA  
4mA  
ESR = 1 ohm max. at 200KHz at 25°C.  
I2t Inrush Current Transient  
Turn-on Voltage Threshold  
Turn-off Voltage Threshold  
-
0.01A2s  
34V  
0.02A2s  
35V  
32V  
30V  
32V  
33V  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
ISOLATED DC/DC CONVERTERS  
48V Input 3.3V/25A, 5V/20A, 12V/8.33A Output, 1/8 Brick  
Output Specifications  
Parameter  
Min  
Typ  
Max  
Notes  
Output Voltage Set Point  
VO=12.0V  
VO=5.0V  
Vo=3.3V  
11.820V  
4.925V  
3.250V  
12.0V  
5.0V  
3.3V  
12.180V  
5.075V  
3.350V  
Vin=48V, Io=50% full  
load, Ta=25°C.  
Line Regulation  
Load Regulation  
VO=12.0V  
VO=5.0V  
VO=3.3V  
-
-
-
±12mV  
±5mV  
±3mV  
±24mV  
±10mV  
±7mV  
VO=12.0V  
VO=5.0V  
VO=3.3V  
-
-
-
±30mV  
±10mV  
±7mV  
±60mV  
±20mV  
±15mV  
Regulation Over Temperature  
(-40°C to +85°C)  
-
-
-
±60mV  
±45mV  
±30mV  
±100mV  
±75mV  
±50mV  
VO=12.0V  
VO=5.0V  
VO=3.3V  
Output Current  
VO=12.0V  
VO=5.0V  
VO=3.3V  
0A  
0A  
0A  
-
-
-
8.33A  
20A  
25A  
Current Limit Threshold  
VO=12.0V  
VO=5.0V  
VO=3.3V  
10A  
23A  
30A  
-
13A  
29A  
36A  
3A2s  
16A  
35A  
42A  
5A2s  
Short Circuit Surge Transient  
Ripple and Noise (RMS)  
VO=12.0V  
VO=5.0V  
VO=3.3V  
-
-
-
25mV  
25mV  
15mV  
50mV  
50mV  
30mV  
Test conditions:  
0-20MHz BW, with a  
1uF ceramic capacitor  
and a 10uF Tantalum  
capacitor at the output.  
Ripple and Noise (pk-pk)  
VO=12.0V  
VO=5.0V  
VO=3.3V  
-
-
-
-
100mV  
100mV  
55mV  
150mV  
150mV  
100mV  
30mS  
Turn on Time  
15mS  
Overshoot at Turn on  
Output Capacitance  
-
0%  
5%  
VO=12.0V  
VO=5.0V  
VO=3.3V  
0uF  
0uF  
0uF  
-
-
-
1000uF  
10000uF  
20000uF  
Transient Response  
Overshoot  
Settling Time  
Overshoot  
-
-
-
-
-
-
-
-
-
-
-
-
300mV  
250uS  
300mV  
250uS  
200mV  
200uS  
200mV  
200uS  
150mV  
150uS  
150mV  
150uS  
500mV  
350uS  
500mV  
350uS  
300mV  
300uS  
300mV  
300uS  
200mV  
200uS  
200mV  
200uS  
25% ~ 50%  
Max Load  
VO=12.0V  
50% ~ 25%  
Max Load  
Settling Time  
Overshoot  
Test conditions: di/dt =  
0.1A/uS, Vin=48V, with  
a 1uF ceramic  
capacitor and a 10uF  
Tantalum capacitor at  
the output.  
25% ~ 50%  
Max Load  
Settling Time  
Overshoot  
VO=5.0V  
VO=3.3V  
50% ~ 25%  
Max Load  
Settling Time  
Overshoot  
25% ~ 50%  
Max Load  
Settling Time  
Overshoot  
50% ~ 25%  
Max Load  
Settling Time  
Note: All specifications are typical at 25°C unless otherwise stated.  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
ISOLATED DC/DC CONVERTERS  
48V Input 3.3V/25A, 5V/20A, 12V/8.33A Output, 1/8 Brick  
General Specifications  
Parameter  
Min  
Typ  
Max  
Notes  
Vin=48V, Io=Io,max  
Efficiency  
VO=12.0V  
VO=5.0V  
VO=3.3V  
87%  
87%  
86%  
90%  
90%  
89%  
-
-
-
Switching Frequency  
Isolation capacitance  
270KHz  
300KHz  
1500pF  
-
330KHz  
-
-
Output Voltage Trim Range  
Over Temperature Protection  
Over Voltage Protection  
80%Vo  
-
110%Vo  
-
125°C  
122%Vo  
117%Vo  
127%Vo  
Calculated Per Bell Core TR-332 (IO =  
Nominal; Ta = 25°C)  
MTBF  
TBD  
Dimensions  
Inches (L × W × H)  
2.30 x 0.896 x 0.395  
Millimeters (L × W × H)  
58.42 x 22.76 x 10.03  
Weight  
-
27g  
-
Note: All specifications are typical at 25°C unless otherwise stated.  
Control Specifications  
Parameter  
Min  
Typ  
Max  
Notes  
Remote On/Off  
Signal Low (Unit On)  
Signal High (Unit Off)  
Signal Low (Unit Off)  
Signal High (Unit On)  
Current Sink  
-0.3V  
2.4V  
-0.3V  
2.4V  
0mA  
-
-
-
-
-
0.8V  
18V  
07CY-85TXXL. The remote  
on/off pin open, Unit on.  
Active Low  
Active High  
0.8V  
07CY-85TXX0. The remote  
on/off pin open, Unit on.  
18V  
0.75mA  
Output Trim Equations  
Equations for calculating the trim resistor are shown below. The Trim Down resistor should be connected  
between the Trim pin and Ground pin. The Trim Up resistor should be connected between the Trim pin and the  
Vout. Only one of the resistors should be used for any given application.  
Vout  
511  
Rtrimdown =  
10.22  
[
kΩ  
]
delta  
Module  
Trim  
GND  
Vout  
Trim  
GND  
Rtrim-down  
Rtrim-up  
(100 + delta) Vo5.11 626  
1.225 delta  
Rtrimup =  
Notes:  
10.22  
[kΩ  
]
Module  
(
)
Vo _ req Vo  
[ ]  
×100 %  
delta =  
Vo  
Vo_req=Desired (trimmed) output voltage [V]  
Output voltage Vo=3.308V for 3.3V output; Vo=5.000V for 5.0V; Vo=12.000V for 12V output  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
ISOLATED DC/DC CONVERTERS  
48V Input 3.3V/25A, 5V/20A, 12V/8.33A Output, 1/8 Brick  
Efficiency Data  
94%  
92%  
90%  
88%  
86%  
84%  
82%  
80%  
78%  
76%  
74%  
72%  
70%  
36V  
48V  
75V  
1.60 3.20 4.80 6.00 7.20 8.33  
OUTPUT CURRENT (A)  
Vo=12V  
94%  
92%  
90%  
88%  
86%  
84%  
82%  
80%  
78%  
76%  
74%  
72%  
70%  
36V  
48V  
75V  
4
8
12  
16  
20  
OUTPUT CURRENT (A)  
Vo=5V  
94%  
92%  
90%  
88%  
86%  
84%  
82%  
80%  
78%  
76%  
74%  
72%  
70%  
36V  
48V  
75V  
5
10  
15  
20  
25  
OUTPUT CURRENT (A)  
Vo=3.3V  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
ISOLATED DC/DC CONVERTERS  
48V Input 3.3V/25A, 5V/20A, 12V/8.33A Output, 1/8 Brick  
Thermal Derating Curves  
Dereating curve of 07CY-85T12x output module  
Dereating curve of 07CY-85T05x output module  
Dereating curve of 07CY-85T03x output module  
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com  
ISOLATED DC/DC CONVERTERS  
48V Input 3.3V/25A, 5V/20A, 12V/8.33A Output, 1/8 Brick  
Pin Connections  
Pin  
Function  
1
Vin+  
Remote On/Off  
Vin-  
2
3
4
Vout-  
5
Sense-  
Trim  
6
7
Sense+  
Vout+  
8
2005 Bel Fuse Inc. Specifications subject to change without notice. 030305  
CORPORATE  
FAR EAST  
EUROPE  
Bel Fuse Inc.  
Bel Fuse Ltd.  
Bel Fuse Europe Ltd.  
206 Van Vorst Street  
Jersey City, NJ 07302  
Tel 201-432-0463  
Fax 201-432-9542  
www.belfuse.com  
8F/ 8 Luk Hop Street  
San Po Kong  
Kowloon, Hong Kong  
Tel 852-2328-5515  
Fax 852-2352-3706  
www.belfuse.com  
Preston Technology Management Centre  
Marsh Lane, Suite G7, Preston  
Lancashire, PR1 8UD, U.K.  
Tel 44-1772-556601  
Fax 44-1772-888366  
www.belfuse.com