NON-ISOLATED DC/DC CONVERTERS
8.3 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/16 A Output
SRBC-16A2Ax
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Non-Isolated
High Efficiency
High Power Density
RoHS Compliant
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Rev.A
Under-voltage Lockout (UVLO)
Over Temperature Protection
OCP/SCP
Wide Input
Wide Trim
Remote On/Off
Active Low/High (Option)
Remote Sense
Industrial Temperature Range
Excellent Thermal Performance
Low Cost
Flexible Output Voltage
Sequencing
Able to Sink & Source Current
Vout Prebias
Description
The Bel SRBC-16A2Ax modules are a series of non-isolated dc/dc converters that deliver up to 16 A of output
current with full load efficiency of 92% at 3.3 Vdc output. These modules provide precisely regulated voltage
programmable via external resistor from 0.75 Vdc to 5.0 Vdc over a wide range of input voltage (8.3 Vdc - 14 Vdc).
These modules have a sequencing feature that enables designers to implement various types of output voltage
sequencing when powering multiple voltages on a board. The open-frame construction and small footprint enable
designers to develop cost and space-efficient solutions. Standard features include remote On/Off, remote sense,
over current protection, short current protection, wide input, and programmable output voltage.
Part Selection
Output
Voltage
0.75 V - 5.0 V
Input
Voltage
8.3 V - 14 V
Max. Output
Current
16 A
Max. Output
Power
80 W
Typical
Efficiency
94%
Model Number
Active Low
SRBC-16A2AL
Model Number
Active High
SRBC-16A2A0
Notes:
1. Add “G” suffix at the end of the model number to indicate Tray Packaging.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Output Enable Terminal Voltage
Sequencing Voltage
1
Min
-0.3 V
-0.3 V
-0.3 V
-40
°C
-55
°C
Typ
-
-
-
-
-
Max
15 V
15 V
Vin
85
°C
125
°C
Notes
Ambient Temperature
Storage Temperature
Notes:
All specifications are typical at 25
°C
unless otherwise stated.
1. SRBC-16A2Ax series of modules include a sequencing feature that enables users to implement
various types of output voltage sequencing in their applications. This is accomplished via an additional
sequencing pin. When the sequencing feature is not used, tie the SEQ pin to Vin or leave it unconnected.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
8.3 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/16 A Output
Input Specifications
Parameter
Input Voltage
Vo, set
≤
3.63 V
Vo, set
>
3.63 V
Input Current (full load)
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current (pk-pk)
8.3 V
8.3 V
-
-
-
-
12 V
12 V
-
100 mA
2 mA
70 mA
14 V
13.2 V
11 A
-
-
200 mA
Tested with one 1000 uF/25 V AL input
capacitor with ESR=0.03 ohm max and 6
×
47 uF/16 V tantalum capacitors with
ESR=0.013 ohm max at 100 kHz, &
simulated source impedance of 1000 nH,
5 Hz to 20 MHz.
Min
Typ
Max
Notes
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
2
-
-
-
-
-
0.2 A s
8.0 V
7.5 V
2
150 mA
0.4 A s
-
-
2
Output Specifications
Parameter
Output Voltage Set Point
Load Regulation
Line Regulation
Regulation Over Temperature
(-40
°C
to +85
°C)
Output Current
Current Limit Threshold
Short Circuit Surge Transient
Ripple and Noise (pk-pk)
Ripple and Noise (rms)
Turn on Time
Overshoot at Turn on
Output Capacitance
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
V
O
=0.75 V -
5.0 V
-
-
-
-
100 mV
50 uS
100 mV
50 uS
-
-
-
-
di/dt=2.5 A/uS; Vin=12 V; and
with 2
×
150 uF polymer
capacitors at the output
Min
-2% Vo,set
-
-
-
0A
-
-
-
-
-
-
-
Typ
-
0.1% Vo,set
0.1% Vo,set
0.3% Vo,set
-
180% Io
1A s
75 mV
30 mV
6 mS
-
-
2
Max
2% Vo,set
-
-
-
16 A
-
3A s
100 mV
45 mV
10 mS
1% Vo,set
5000 uF
2
Notes
Vin=12 V, full load
Io=Io, min to Io, max
Vin=Vin, min to Vin, max
Tref=Ta, min to Ta, max
Tested with 0-20 MHz, 10 uF
tantalum capacitor & 1 uF TDK
ceramic capacitor at the output
Note:
All specifications are typical at nominal input, full load 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
NON-ISOLATED DC/DC CONVERTERS
8.3 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/16 A Output
General Specifications
Parameter
Efficiency
Vo=5.0 V
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.75 V
Switching Frequency
Over Temperature Shutdown
1
Min
-
-
-
-
-
-
-
265 kHz
-
0.7525 V
-
Typ
94%
92%
90%
88%
87%
85%
79%
300 kHz
130
°C
-
-
2,666,488 hours
Max
-
-
-
-
-
-
-
335 kHz
-
5V
0.5 V
Notes
Measured at Vin=12 V, full load
Output Trim Range (Wide Trim)
Remote Sense Compensation
MTBF
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
Calculated Per Bell Core SR-332 (I
O
=80%
Io,max; Vo=5 V; Vin=12 V; T
a
= 25°C)
1.30 x 0.53 x 0.315
33.02 x 13.46 x 8.00
-
8g
-
Notes:
All specifications are typical at 25
°C
unless otherwise stated.
1. The Tref temperature measurement location. For reliable operation the Tref 1 and Tref 2 must not
exceed 130
°C.
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit Off)
Signal High (Unit On)
Signal Low (Unit On)
Signal High (Unit Off)
Voltage Sequencing
Sequencing Delay Time
Sequencing Slew Rate Capability
Tracking Accuracy
Power-Up
Power-Down
10 mS
-
-
-
-
-
100 mV
300 mV
-
2 V/mS
200 mV
500 mV
Vin, min to Vin, max; Io, min to Io, max;
Vseq<Vo
Delay from Vin, min to application of voltage
on SEQ pin
Min
-0.2 V
-
-0.2 V
2.5 V
Typ
-
-
-
-
Max
0.3 V
Vin, max
0.3 V
Vin, max
Notes
SRBC-16A2A0; Remote On/Off pin open, Unit
on.
SRBC-16A2AL; Remote On/Off pin open, Unit
on.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
8.3 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/16 A Output
Output Trim Equations
Equation for calculating the trim resistor (in
Ω)
given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground.
Vout
R
trimup
=
10500
−
1000
V
adj
−
0.7525
Sense
Module
trim
Rtrim
GND
Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up voltage should be connected between the Trim pin and Ground.
Vout
V
trimup
=
0.7
−
0.0667
×
(
V
adj
−
0.7525)
Sense
Module
trim
Vtrim
GND
Thermal Derating Curves
Vo=0.75 V
Vo=1.8 V
Vo=3.3 V
Vo=5.0 V
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
8.3 Vdc - 14 Vdc Input
0.75 Vdc - 5.0 Vdc/16 A Output
Efficiency Data
Module 5.0V
98.0%
96.0%
Efficiency
94.0%
92.0%
90.0%
88.0%
86.0%
84.0%
2.0
4.0
6.0
8.0
10.0 12.0
Output Current
14.0
16.0
8.3V
12.0V
13.2V
Module 3.3V
96.0%
94.0%
Efficiency
92.0%
90.0%
88.0%
86.0%
84.0%
2.0
4.0
6.0
8.0
10.0 12.0
Output Current
14.0
16.0
8.3V
12.0V
14.0V
Module 2.5V
96.0%
94.0%
Efficiency
92.0%
90.0%
88.0%
86.0%
84.0%
82.0%
2.0
4.0
6.0
8.0
10.0 12.0
Output Current
14.0
16.0
8.3V
12.0V
14.0V
Module 1.8V
94.0%
92.0%
Efficiency
90.0%
88.0%
86.0%
84.0%
82.0%
80.0%
2.0
4.0
6.0
8.0
10.0 12.0
Output Current
14.0
16.0
8.3V
12.0V
14.0V
Module 1.5V
94.0%
92.0%
90.0%
Efficiency
88.0%
86.0%
84.0%
82.0%
80.0%
78.0%
2.0
8.3V
12.0V
14.0V
Module 1.2V
92.0%
90.0%
Efficiency
88.0%
86.0%
84.0%
82.0%
80.0%
78.0%
76.0%
2.0
8.3V
12.0V
14.0V
4.0
6.0
8.0
10.0
12.0
Output Current
14.0
16.0
4.0
6.0
8.0
10.0
12.0
Output Current
14.0
16.0
Module 0.75V
90.0%
85.0%
80.0%
75.0%
70.0%
65.0%
60.0%
55.0%
50.0%
2.0
Efficiency
8.3V
12.0V
14.0V
4.0
6.0
8.0
10.0 12.0
Output Current
14.0
16.0
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
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