BTCPOWER S25-48-5

BTCPower
TM
Broadband TelCom Power, Inc.
Redefining “Current” Limits In Power Conversion
Technical Specification
S25-48-5, S25-48-5N
48Vin 5.0Vout 5A
Description
The S25 family of high efficiency, low power DC/DC
converters offer power levels that exceed other bricks
with similar footprints. They are targeted specifically at
the telecommunication, industrial electronics, mobile
telecommunication and distributed power markets.
With a wide input voltage range of 36-75V they are
available with output voltages of either 1.5, 1.8, 2.5,
3.3 or 5 Volts. All models feature an input filter, input
undervoltage lockout, output overvoltage and
overtemperature protection, output current limiting and
short circuit protection. The fully enclosed,
encapsulated construction with aluminum heat
spreader design achieves very efficient heat transfer
with no hot spots. The use of patented design
concepts facilitate maximum power delivered with the
highest efficiency up to 90%. The converters combine
creative design concepts with highly derated power
devices to achieve very high reliability, high
performance and low cost solution to systems
designers requiring maximum power in small
footprints.
Features
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Applications
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Telecommunications
Data Communications
Wireless Communications
Networking Gear
Servers, Switches and Data Storage
Semiconductor Test Equipment
Distributed Power Architecture
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Delivers up to 25W in 1.2” x 2.0” format
High power density up to 30W/inch3
Synchronous rectification topology
No airflow or heat sink required
No minumum load required
Low profile of only 0.35 inch
High output current in small footprint
1.5V, 1.8V, 2.5V, 3.3V or 5V models
Wide input operating range 36-75V
-40°C to +100°C ambient operation
Input undervoltage lockout
Output overvoltage protection
Output current limit and short circuit protection
On/Off pin
Output adjustment +/-10% range
1500V, 10M input-to-output isolation
Enclosed construction with heat spreader for
low temperature rise
Enclosed six-sided metal shield construction
for low EMI/RFI
UL 60950 recognized, TUV EN60950 and
CSA C22.2 No. 60950-00 Certified
Meets conducted limits of FCC Class B and
CEI IEC61204-3 Class B with external filter
MTBF of 850,000 hours @ 50°C
(MIL-HDBK-217F)
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
CONVERTER SELECTION
Typical @ Ta=+25°C under nominal line voltage and full load conditions.
Input
Output
Voltage (Volts)
Model
Current (A)
Voltage
Current
Efficiency
75% Load
Nominal
Range
No load
Full load
(Volts)
(Amps)
(%)
48
36-75
0.050
0.613
5.0
5.0
90
S25-48-5
Consult factory for other output voltage configurations.
Outline Information and Summary Specifications
Pin Connection
Pin# Single Output
1
On/Off
2
3
4
Vin Vin +
Vout +
5
6
Vout Trim
All dimensions are in inches [mm]
All pins are dia. 0.040 [1.02]
Pin material: Brass
Pin finish: Gold plated
Insulator pad around pins: Silicone rubber
Case: Aluminum material with anodized finish
Weight: 39.2 (1.4oz)
Tolerance
Inches
Millimeters
•XX
± 0.020
•X
± 0.5
•XXX
± 0.010
•XX
± 0.25
Pin:
± 0.002
± 0.05
Thermal derating for vertical orientation, Vin=54V
Output
Voltage
(Volts)
5.0
Output Current at 40°C (Amps)
Output Current at 60°C (Amps)
Output Current at 80°C (Amps)
Free Air
200 LFM
300 LFM
Free Air
200 LFM
300 LFM
Free Air
200 LFM
300 LFM
5.0
5.0
5.0
4.6
5.0
5.0
0.3
1.8
3.8
The information and specifications contained in the specification are believed to be accurate and reliable at the time
of publication. Specifications are subject to change without notice.
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 2 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Electrical Specifications
Ta=25°C, Vin=48V unless otherwise noted.
PARAMETER
Absolute maximum rating
Input voltage
Operating case temperature
Storage temperature
Humidity
Input characteristics
Operating input voltage range
Turn on voltage threshold
Turn off voltage threshold
Transient withstand
Maximum input current
Off converter input current
Output characteristics
Output voltage set point
Output voltage line regulation
Output voltage load regulation
Output voltage trim range
Output voltage ripple and noise
Output over power protection
Over-voltage protection
Over-temperature protection
Temperature coefficient
Capacitive Load
Output dynamic characteristics
Startup time
Transient recovery time
Transient peak deviation
Efficiency (see efficiency curve)
100% load efficiency
Isolation characteristics
Isolation voltage (primary to secondary )
Isolation voltage (primary to case)
Isolation voltage (secondary to case)
Isolation resistance
Isolation capacitance
Feature Characteristics
Switching frequency
ON/OFF control (Positive logic)
Converter On
Converter Off
ON/OFF control (Negative logic)
Converter On
Converter Off
Output voltage trim range
Calculated MTBF
Weight
NOTES
MIN
TYP
0
-40
-55
36
48
35
MAX
UNIT
80
100
125
95
V
°C
°C
%
75
V
V
V
V
A
mA
34
100
0.85
36
Transient duration: 100ms
100% load , 36Vin
48Vin
5
36~75 Vin
10%-100%Load
20Mz bandwidth, 100% Load, 48Vin
50
120
100
6.2
±0.04
100,000
V
%
%
%
mV(pk-pk)
%
V
°C
%/°C
µF
100
800
2
ms
µs
%Vo
±0.3
±0.5
±10
100
140
7.1
100
0
5% to 95% of the output voltage
25% load change
25% load change
50
48 Vin
88
%
1500
1000
1000
1000
VDC
VDC
VDC
MΩ
pF
275
KHz
1minute
1minute
1minute
500VDC, Primary to secondary
Primary to secondary
10
225
250
S25-48-5
3
-1
7
1.2
V
V
S25-48-5N
-1
3
-10
900,000
1.2
7
+10
V
V
%
Hrs
g(oz)
Percentage of normal output
Bellcore @ 50°C
28(1.0)
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 3 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Basic Operation And Functions
S25-48-5/S25-48-5N is a high efficiency, isolated
DC/DC converter. Neither heat sink nor airflow is
required when the unit operates at ambient
temperature of 25°C. The unit has basic control,
output adjustment and protection functions.
Input (Pin 2, Pin 3)
Input power Vin(+) must be connected to Positive
input pin 3; Input power Vin(-) must be connected to
Negative input pin2.
Output (Pin 4, Pin 6)
Output power Vout(+) must be connected to
Positive output pin 4; Output power Vout(-) must be
connected to Negative output pin6.
ON/OFF (Pin 1)
Permits the user to maintain unit On/Off, in order to
properly sequence different power supplies and
reduce power consumption during the standby
condition. There are two ON/OFF control options:
positive logic (S25-48-5) and negative logic (S2548-5N). Both are referenced to Vin-.
Remote Sense
The unit does NOT have remote sense pins.
Output Trim (Pin 6)
Permits the user to adjust the output voltage up or
down to achieve the custom voltage or to make the
output voltage margining.
The unit’s output voltage can be adjusted up10% or
down 10% relative to the rated output voltage by
adding an external resistor between pin 6 and one
of the output pins (pin 4 and 5).
To increase the output voltage, a trim resistor
should be connected between pin 6(Trim) and pin 5
(Vout-), as shown in Fig 2.
To decrease the output voltage, a trim resistor
should be connected between pin 6 (Trim) and pin 4
(Vout+), as shown in Fig 3.
The recommended trim resistor values can be
found in the trim table (Table 1) and charts (Fig 4
and 5).
Pin 1 is the "Enable" pin, connecting a TTL
compatible pin. A TTL control signal to this pin,
according to the specification, turns the unit on or
off.
The positive logic unit turns on when the pin is at
logic high or open, and turns off at logic low.
The negative logic unit turns on when the pin is at
logic low, and turns off at logic high state.
Typical ON/OFF connection is shown in Fig 1.
Fig 2. Configuration for increasing the output voltage
Fig 1. Recommended ON/OFF circuit configuration
Fig 3. Configuration for decreasing the output voltage
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 4 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Trim resistace (k)
120
Protection Features
100
80
Input under voltage lockout (UVL)
60
The input voltage must be at least 35V for the
unit to turn on. Once the unit has been turned on,
it will shut off when the input voltage drops below
34V.
40
20
0
1
2
3
4
5
6
7
8
9
10
Trim-up Vout change (%)
The unit is protected against over current or short
circuit on the output. When sensing an over
current condition, the unit will enter constant
current operation and reduce the output voltage.
Upon short-circuit condition, the unit will shut
down.
Fig 4 Trim-up output vs. trim resistance
Trim resistace (k)
140
After over-current or short circuit condition is
removed, the unit will resume normal operation
automatically.
120
100
80
Output Over Voltage Protection (OVP)
60
40
20
0
1
2
3
4
5
6
7
8
9
10
Trim-down Vout change (%)
Fig 5 Trim-down output vs. trim resistance
Table 1
Output voltage trim vs. trim
resistor value
Trim Voltage
+10%
+9%
+8%
+7%
+6%
+5%
+4%
+3%
+2%
+1%
Output Over-Current Protection (OCP)
Trim Resistor
2.08k
3.38k
5.00k
7.10k
9.87k
14.22k
20.30k
31.20k
51.00k
109.70k
Trim Voltage
-10%
-9%
-8%
-7%
-6%
-5%
-4%
-3%
-2%
-1%
Trim Resistor
0.28k
1.77k
3.60k
5.97k
9.46k
14.17k
20.20k
32.96k
55.82k
127.6k
This unit will shut down and latch off if the output
voltage exceeds the over protection point. The
over-voltage-protection latch is reset only by
another cycle of the input power.
The OVP set point is between 6.2V~7.1V.
Over Temperature Protection (OTP)
This unit will shut down if the case temperature
exceeds the over temperature set point. The unit
will resume normal operation automatically when
the case temperature drops down.
The OVP set point is around 100°C.
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 5 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Application Considerations
Input source Impedance
The unit has been designed to be stable with no
external capacitor when used in a low inductance
input and output circuit.
•
Never ground either of the input pins of
the unit without grounding one of the
output pins. This may allow a non-SELV
voltage to appear between the output pin
and ground.
Electromagnetic Compatibility (EMC)
However in many applications, the inductance
with the distribution from the power source to the
input of the unit can affect the stability of the unit.
An external capacitor across the input will
improve the stability of the unit. Also in many
applications, the user has to use decoupling
capacitors at the output load, to ensure the hold
up time for the load.
The unit’s conducted emission meets the
requirement of EN55022 Class B Specifications,
so no external input filter is needed unless a
stricter conducted EMI/EMC limitation is required
to satisfy or user has its own requirement on the
input.
Fig 6 shows the measured conducted EMC.
Six-sided metal shields for zero radiate emission.
Safety Requirements (SR)
The unit meets UL/CSA/TUV safety requirements
per UL60950, TUV EN60950 and CSA C22.2
No.60950-00.
Basic insulation is provided
between input and output.
Caution:
The unit does NOT have a fuse inside. The safety
agencies require an external normal-blow fuse to
be used at the input side to achieve maximum
safety. The recommended fuse rating is 2A/100V.
If the input source is non-SELV (ELV or a
hazardous voltage greater than 60 Vdc and less
than or equal to 75 Vdc), for the unit output to be
considered meeting the requirements of safety
extra low voltage (SELV), all of the following must
be met:
• The input source is to be provided with
reinforced insulation from any hazardous
voltage, including the ac main.
• The input pins of the unit are not operator
accessible.
• For the whole system, for safety agencies
requirements, and for the combination of
the unit input side (primary side) and the
output side (secondary side), verify that
under a single fault, hazardous voltages
do not appear at the unit output side
(secondary side).
Fig 6. Conducted EMC (150KHz-30MHz) test result, the
upper trace is the limit of EN55022 Class B specification
Input Transient Withstand (ITW)
The unit can withstand input transient voltage
with 100V/100ms pulse and never be damaged.
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 6 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Characterization
General information
This unit has many operational characterized
aspects including thermal derating, efficiency,
start up and overshoot, output ripple & noise,
dynamic response, over current protection curve
and etc.
Efficiency with nominal input (48V) at different
ambient temperatures (25°C, 40°C and 55°C) is
also given in Fig 12.
Dynamic Response
The following pages contain specific plots or
waveforms associated with the unit. Additional
comments for specific data are provided below.
The dynamic response of the unit at load step is
shown in Fig 13. The output load current change
from 50% to 75% and return to 50% at the slew
of 0.1A/µs. The input is 48V and a filter of 10µF
tantalum capacitor plus a 1µF ceramic capacitor
is put parallel to the output.
Test Conditions
Ripple and Noise
All data presented were taken with the unit
soldered to a test board, which is a 0.060” thick
printed circuit board. No heat sink was used
during all measurements. No airflow was used
except in the de-rating test.
The output voltage waveform has been measured
at full load condition, with 10µF tantalum
capacitor plus 1µF Ceramic capacitor closely
parallel to the unit’s output. Fig 14 shows the
output ripple and noise waveform.
For the input line, a 1µF /100V ceramic capacitor
has been used during all these tests. On the
output side, a 10µF tantalum capacitor with Esr <
0.12Ω and 1µF ceramic capacitor has been used.
The capacitors on both the input and output sides
were close to the unit.
NOTE:
It is important to make sure that the components
on the unit do not exceed their rating.
Start up
The startup scenarios are explained in Fig 7 and
8.
The measured waveforms showing the turn on
transient are given in Fig 9 and 10, for both
positive and negative logic control units.
Thermal De-rating
For thermal de-rating test, the output current vs.
the ambient temperature and the airflow rates
has been measured, and the results are given in
Fig 15.
The ambient temperature varies between 50°C
and 85°C with the airflow of 0, 100 and 200LFM
(0, 0.5m/s and 1m/s).
Others
Other curve and waveforms presented include
the output voltage vs. current curve (Fig 16) and
the input current ripple waveform at full load
condition (Fig 17)
Efficiency
Efficiency vs. load current curve at different
inputs of 36V, 48V and 75V is given in Fig 11.
The ambient temperature is 25°C.
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 7 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Start up Information
Scenario #1: Initial Start up from power supply
On/Off function enabled, the unit starts via input
voltage Vin, see Fig 7.
Time
t0
Comments
On/Off pin is On: system front-end power is switched
on, Vin to unit begins to rise.
t1 Vin crosses Under Voltage Lockout protection circuit
threshold: the unit enabled to be on
t2 The unit begins to turn on ( unit turn-on delay).
t3
Unit output voltage reaches 100% of normal
voltage.
For this example, the unit total start up time (t3- t1) is
typically 200us.
Scenario #2: Initial Start up using On/Off Pin
With Vin previously powered, the unit starts via
On/Off pin, see Fig 8.
Time
t0
t1
t2
t3
Comments
Vin at nominal value.
Arbitrary time when On/Off pin is enabled (Unit
enabled)
End of unit turn-on delay
Unit Vout reaches 100% of nominal voltage.
Fig 7. Start up waveform
For this example, the unit total start up time (t3- t1) is
typically 300us.
Fig 8. Start up using On/Off pin
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 8 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Turn-On Transient Waveforms
Efficiency Curves
Efficiency (%)
90
85
80
36V
75
48V
70
75V
65
1
2
3
4
5
Output current (A)
Fig 9. Startup under positive logic control at Vin=48v, Iout
=5A. Ch2: ON/OFF signal (1V/div) , Ch1: Output voltage
(2V/div), Co=10µF tantalum capacitor + 1µF Ceramic
capacitor, time scale: 200µs/div
Fig 11. Efficiency vs. output current at various Input voltage
The ambient temperature is 25°C.
Efficiency (%)
90
85
80
25°C
75
40°C
70
55°C
65
1
2
3
4
5
Output current (A)
Fig 10. Startup under negative logic control at Vin=48v, Iout
=5A. Ch1: ON/OFF signal (5V/div) , Ch2: Output voltage
(2V/div), Co=10µF tantalum capacitor + 1µF Ceramic
capacitor, time scale: 200µs/div
Fig 12. Efficiency at nominal input (48V) vs. load at different
ambient temperatures of 25°C, 40°C, 55°C without air flow,
the input voltage is 48V.
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 9 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Fig 14. Output voltage Ripple & Noise at Vin=48v, Iout=5A
Co=10µF tantalum capacitor + 1µF Ceramic capacitor, ch1:
20mV/div, time scale: 2µs/div.
Thermal De-Rating Curve
Output current(A)
Dynamic Response Waveform
6
5
4
3
0LFM
2
100FM
1
200LF
M
0
50
55
60
65
70
75
80
85
Ambient Temperature(°C)
Fig 15. Maximum output current vs. temperature. Both the
input and output voltages are nominal .
Fig 13. Dynamic response of load step at Vin=48v, Ch1:
output voltage change(100mv/div), Ch2: output current step
of 50%-75%-50% (2A/div). Current slew rate:0.1A/µs,
Co=10µF tantalum capacitor + 1µF Ceramic capacitor, time
scale: 1ms/div
Output Ripples and Noise Waveform
Over Current Protection Curve
Fig 16. Output voltage vs current showing current limit point
and converter shut down point
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 10 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04
BTCPower
TM
Technical Specification
S25-48-5, S25-48-5N
48Vin 5Vout 5.0A
Input Current Ripple Waveform
Fig 17. Input current ripple with full output load at 48V input
(50mA/div), time scale: 1µs/div
Broadband TelCom Power, Inc. – 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 11 of 11
Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com
PS S25-48-5 Rev 3 16-1-04