SQ100-48-1.5中文资料
Broadband TelCom Power, Inc.
BTCPower BTCPower
TM
Redefining “Current” Limits In Power Conversion
Technical Specification
SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A SQO100-48-1.5, SQO100-48-1.5N
Description
The SQ(Enclosure)/SQO(Open Frame) family of high power density, high efficiency DC/DC converters deliver up to 25A in an industry standard quarter brick footprint. 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. These converters are available either in a package that is fully enclosed with a six-sided metal shield or an alternative, open-frame construction. In both cases the aluminum heat spreader design achieves very efficient heat transfer with no hot spots. The use of patented Flat Transformer technology and other patented design concepts facilitate very low temperature rise. The use of highly derated power devices help to achieve high reliability, high performance and offer a low cost solution to sys tems designers requiring maximum power in small footprints.
Applications
? Telecommunications
? Data Communications ? Wireless Communications
? Networking Gear
? Servers, Switches and Data Storage ? Semiconductor Test Equipment ? Distributed Power Architecture
Features
? Delivers up to 25A in a quarter brick
? High power density up to 90W/inch 3 ? High efficiency Synchronous topology ? Unique Flat Transformer Technology ? No airflow or heat sink required ? No minImum load required ? Low profile of only 0.34 inch
? 1.5V, 1.8V, 2.5V, 3.3V or 5V output 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 ? Remote On/Off pin (Negative logic also available) ? Output adjustment +/-10% range ? Output remote sense feature
? 1500V, 10M input -to-output isolation
? Enclosed construction with heat spreader for low temperature rise
? Also available in an open-frame construction
? UL 60950 recognized, TUV EN60950 and CSA C22.2 No. 60950-00 Certified and CE marked ? Meets conducted limits of FCC Class B and CEI IEC61204-3 Class B with external filter ? MTBF of 750,000 hours @ 50°C (MIL-HDBK-217F)
Technical Specification
SQ100-48-1.5, SQ100-48-1.5N
SQO100-48-1.5, SQO100-48-1.5N 48Vin 1.5Vout 25A
BTCPower BTCPower
T M
Data Sheet
CONVERTER SELECTION
Typical @ T a =+25°C under nominal line voltage and full load conditions.
Input
Output
Voltage (Volts) Current (A) Voltage Current Efficiency 75% Load
Model Nominal
Range No load Full load (Volts) (Amps) (%)
SQ100-48-1.5 48 36-75 0.040 0.93 1.5 25 83 SQO100-48-1.5
48
36-75
0.040
0.93
1.5
25
83
For negative logic feature add designator N as suffix to model number, i.e., SQ100-48-1.5N or SQO100-48-1.5N Consult factory for other output voltage configurations.
Outline Information and Summary Specifications
Pin Connection Pin# Function 1 Vin + 2 On/Off 3 Vin - 4 Vout - 5 Sense - 6 Trim 7 Sense + 8
Vout +
All dimensions are in inches [mm] Pin 4 and 8 are dia. 0.062 [1.57] All other pins are all dia. 0.040 [1.02] Pin material: Brass
Pin finish: Tin/Lead plated
Heat spreader (baseplate) material: Aluminum Weight: 50.7g (1.8oz)
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 Current at 40°C (Amps) Output Current at 60°C (Amps)
200 LFM 300 LFM 200 LFM 300 LFM
Output Voltage (Volts) NoHeatsink With Heatsink
No Heatsink With
Heatsink
No Heatsink
With
Heatsink
No Heatsink
With Heatsink
1.5 25 25 24 25 23 25 25 25
The information and specifications contained in this specification are believed to be accurate and reliable at the time of publication. Specifications are subject to change without notice.
Technical Specification
SQ100-48-1.5, SQ100-48-1.5N
SQO100-48-1.5, SQO100-48-1.5N 48Vin 1.5Vout 25A BTCPower BTCPower T M
Data Sheet
Electrical Specification
Typical test data at Ta=25°C, Vin=48V unless otherwise noted.
PARAMETER NOTES MIN TYP MAX UNIT Absolute maximum rating
Input voltage 0 80 V
Operating case temperature -40 100 °C
Storage temperature -55 125 °C
Humidity 95 %
Input characteristics
Operating input voltage range 36 48 75 V
Turn on voltage threshold 34 35 36 V
Turn off voltage threshold 33 34 35 V
Transient withstand Transient duration: 100ms 100 V
Maximum input current 100% load, 36Vin 1.3 1.7 A
Off converter input current 36Vin 2.2 3.5 mA
Output characteristics
Output voltage set point 1.490 1.500 1.510 V
Output voltage line regulation 36~75 Vin ±1 ±1.1 %
Output voltage load regulation 10%-100%Load ±1 ±1.1 %
Output voltage trim range Percentage of normal output -20 +15 %
Output voltage ripple and noise 20Mz bandwidth, 100% Load, 48Vin 100 150 mV(pk-pk) Output over power protection 110 120 140 %
Over-voltage protection 1.8 2.0 2.2 V
Output current range 0 25 A
Over-temperature protection 110 120 °C
Temperature coefficient ±0.05 %/°C Capacitive Load 0 20,000 μF
Output dynamic characteristics
Startup time 5% to 95% of the output voltage 50 80 ms
Transient recovery time 25% load change 800 μs
Transient Peak Deviation 25% load change 10 %Vo
Efficiency (see efficiency curve)
100% load efficiency 48 Vin 83 %
Isolation characteristics
Isolation voltage (primary to secondary) 1minute 1500 VDC
Isolation voltage (primary to case) 1minute 1000 VDC
Isolation voltage (secondary to case) 1minute 1000 VDC
Isolation resistance 500VDC, Primary to secondary 10 M?
Isolation capacitance Primary to secondary 1000 pF
Feature Characteristics
Switching frequency 340 360 380 KHz
ON/OFF control (Positive logic)
Converter On
Converter Off SQ100-48-1.5 2.5
-1.0
7
1.2
V
V
ON/OFF control (Negative logic)
Converter On
Converter Off SQ100-48-1.5N -1.0
2.5
1.2
7
V
V
Calculated MTBF Bellcore @50°C 1,000,000 Hrs Weight 40 g
Basic operation and functions
The SQ(SQO) family uses FTT technology to
achieve high output current. The whole unit switches at the fixed frequency for a predictable EMI performance. Rectification of the
transformer's output is done by synchronous rectifiers to make the unit work in a higher efficiency power performance.
The SQ(SQO) Brick has many standard controls and protection functions .
Input ( pin1, pin3 )
Input power Vin(+) must be connected to Positive input voltage pin1; Input power Vin(-) must be connected to Negative input voltage pin3.
Output ( pin8, pin4 )
Output power Vout(+) must be connected to
Positive output voltage pin8; Output power Vout(-) must be connected to Negative output voltage pin4.
On/Off ( pin 2 )
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 remote control options available, positive logic and negative logic is referenced to Vin (-), and typical connections are shown in Fig 1.
Fig. 1: Typical Circuit for On/Off Function
Pin 2 is the "Enable" pin, connecting a TTL compatible pin. A TTL control signal to this pin, according to the specification, will turn the unit on or off.
The positive logic version turns on when pin 2 is at logic high, and turns off when pin 2 is at logic low. The unit is on when pin 2 is left open.
The negative logic version turns on when pin 2 is at logic low and turns off when pin 2 is at logic high. The pin 2 can be directed to Vin(-), to enable automatic turn on to the unit without the need of an external control signal.
Turn on timing vs. Input On/Off Pin is shown in Figure 12, and the Turn off timing vs. Input On/Off pin is shown in Figure 13.
Remote Sense ( pin 5, pin 7 )
Permits the user to maintain the accurate output voltage at the remote load terminals regardless of the line drop.
The Sense(-) (pin5) and Sense (+) (pin7) should be connected at the load or at the point where the regulation is needed. ( shown on Fig. 2)
Fig 2: Remote Sense Circuit
The remote sense feature of the unit
compensates for voltage drop occurring between the output pins of the unit and load. The Sense(-) (pin5) and Sense(+)(pin7) should be connected at the load or at the point where regulation is required.
If remote Sense is not required, the Sense(-) pin must be connected to the Vout(-) pin (pin4), and the Sense(+) pin must be connected to the
Vout(+) pin(pin 8) to ensure the unit will regulate at the specified output voltage. If these connections are not made, the unit’s output voltage will be higher than the specified value.
The unit output over voltage protection senses the voltage across Vout(+) and Vout(-), and not across the sense lines, so the resistance between the output pins of the unit and the load should be minimized to prevent unwanted triggering of the OVP.
When using the remote sense feature, the output voltage at the unit can be increased by as much as 10% above the normal rating, in order to maintain the required voltage across the load. Therefore, the designer must consider this condition.
Also when using the remote sense function, the output power must be taken care of, as not to exceed the maximum power capability of the unit.
Output voltage 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 adjustment range is from + 10% to -20%.
Output voltage can be adjusted up or down, by connecting the Rtrim-up or Rtrim-down resistor as shown. Rtrim-up makes the output voltage go up to 10%; and the Rtrim-down makes the output voltage go down to 20%. (see Fig.5 & Fig. 6)
Leave Trim pin ( Pin 6) open for normal output voltage.
When trimming up, care must be taken, not to exceed the unit OVP threshold. A typical circuit is shown in Fig. 3.
Also, care must be taken not to exceed the unit’s maximum allowable output power.
Fig 3. Trim Up Output Voltage Circuit
For Trim up resistor value, we list the reference “Trim Up Resistance” for increasing the output voltage for every 1 percent (see Trim Table 1).
Fig 5. shows “Trim Up Resistance” value chart.
Trimming down the output voltage for a typical circuit, as shown on Fig. 4.
Fig 4. Trim Down Output Voltage Circuit
For Trim down resistance value, we list the
reference “Trim Down Resistance” for decreasing output voltage for every 1 percent (see Trim Table 2.).
Fig 6 shows “Trim Down Resistance” value chart.
Fig 5. Trim Up Resistance for reference chart
Fig 6 Trim Down Resistance for reference chart
Rtrim-up(K) Vout(v) Trim up Vout %
57.6 1.53 2
36.5 1.545 3
26.1 1.56 4
19.6 1.575 5
15.4 1.59 6
12.4 1.605 7
10.2 1.62 8
8.45 1.635 9
6.98 1.65 10
Table 1: Rtrim-up resistor values.
Rtrim-dn(K) Vout(v) Trim down Vout % 255 1.47 2
165 1.455 3
118 1.44 4
93.1 1.425 5
75 1.41 6
61.9 1.395 7
53.6 1.38 8
45.3 1.365 9
39.2 1.35 10
Table 2: Rtrim-down resistor values.
Protection Features
Input Under-voltage Lockout ( IUV )
Input under voltage lockout ( IUV ) is standard with the SQ(SQO) unit. The unit will shut down when the input voltage drops below a threshold, and the unit will turn on when the input voltage goes to the upper threshold.
The hysteretic voltage of the under voltage protection is 2 V, normally from the 33.5V to
35.5V range.
Output Over-current Protection ( OCP )
The unit will shut down when the over current or short circuit condition exists.
Once the OCP happens, the unit has shut down. The attempted restart will continue indefinitely until the over current or short circuit condition is removed. When OCP happens, the output voltage drops below 1.1V.
Figure 19 shows output voltage vs. output current limit point and the unit’s shutdown point.
Input voltage has almost no effect on the current limit point. Output Over-voltage Protection ( OVP )
The unit will shut down when the output voltage exceeds the over voltage threshold.
If the output voltage across Vout(+) (pin8) and Vout(-) (pin4) exceeds the threshold of the OVP circuitry, the unit has shut down which is caused by an OVP circuit, and the unit will never restart, and the output voltage is below 0.5V.
Over Temperature Protection ( OTP )
The unit will shut down when the base plate temperature exceeds the protection threshold. The unit will shut down under the base plate temperature over a 110°C condition to protect the unit from overheating. The OTP circuit will turn the unit off when OTP happens. Once the unit has shut down, it will restart at the cycle when the base plate temperature goes down.
Application and consideration
Input Source Impedance
The unit has been designed to be stable with no external capacitors when used in a low inductance input and output circuit.
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. The addition of 47uF electrolytic capacitor with an Esr < 1? (at 100khz) across the input can ensure 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.
Safety Requirements and Considerations
The unit meets the American and International safety regulatory requirement UL60950, TUV EN 60950, CSA C22.2 No. 60950-00. Basic insulation is also provided between the input side and the output side.
To meet safety agencies requirements, an input line fuse must be used external to the unit. An 8A fuse or less with a normal blow rate must be used to meet the safety agencies requirements
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 whole system, for safety agencies
requirements, and for the combination of the unit’s input side (primary side) and the unit’s output side (secondary side), verify that under a single fault, hazardous
voltages do not appear at the unit’s output side (secondary side).
? 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 )
EMC requirements must be met at the end product and system level from the customer. As there is no specific standards dedicated to the EMC of board-mounted DC/DC converter, which
exist. However the SQ(SQO) Family unit has been tested for EMC requirement levels.
With the addition of a simple external filter (see Fig 7.), the SQ(SQO) Family unit passes the FCC class B test conducted and CEI IEC61204-3 Class B.
Fig 7. External filter circuit for EMC.
With this addition of an external simple filter circuit, we can easily meet the EMC agencies requirements. The EMC test result is shown on Fig 8 below.
Fig 8. EMC conducted test result Input Transient Withstand
SQ(SQO) unit can withstand input transient voltage with 100v/100ms pulse, and never be damaged.
Characterization General information
The SQ(SQO) unit has many operational characterized aspects, including thermal derating, efficiency, start up and down timing parameter, overshoot, output ripple & noise, dynamic response to load, and over current protection curves.
The following pages contain specific plots or waveforms associated with the unit. Additional comments for specific data are provided below. Test Conditions
All data presented herein were taken with the unit soldered to a test board, which is a 0.060” thick printed circuit board. All measurements require an airflow wind with airflow meter measuring the airflow LFM value.
For the input line, a 47uF/100V electrolytic capacitor with Esr < 1 ? is used in the test. It is better to make the 47uF capacitor closed to the unit. For the output, a 10uf tantalum capacitor with Esr < 0.12? and 1uF ceramic capacitor has been used for the test.
Also it is better when these two capacitors are close to the unit.
Note:
It is important to make sure that the components on the unit do not exceed their rating.
Thermal Derating
For thermal derating, output current vs. ambient temperature and airflow rates are tested, and the test graphic is shown in Fig 23.
Ambient temperature was varied between 25°C and 85°C, with airflow rates from 0 LFM to
300LFM (0 to 1.5 m/s). Figure 23 shows that maximum output power derating vs.ambient air temperature with airflow rates of 0LFM through 300 LFM. At Vin=48v. Figure 24 shows output power derating vs. ambient aur temperature with airflow rates of
0LFM through 300LFM. At Vin=48v. ( Open frame, without heatsink )
Efficiency
Efficiency vs. load current curve is given below. The ambient temperature is 25°C, airflow is
200LFM(1m/s), and the input voltage is 36V, 48V, and 75V conditions.
Figure 14 shows that Efficiency at nominal output voltage vs. output current for various Input voltage.
Start up
During the turn on transient using the On/Off pin for full rated current and No load conditions, the output voltage waveforms are given in the below. Fig 9, Fig 10 and Fig 11 show that all different kind of start up waveform.
Ripple and Noise
The output voltage waveform measured at No load and Full load current, with 10uf tantalum and 1uf ceramic capacitor across to close the unit. Figure 21 and Figure 22 show that output voltage Ripple & Noise at Vin=48v and different load condition.
Start up information
Scenario #1: Initial Start up from power supply
On/Off function enabled, the unit starts via input voltage Vin
See Fig 9.
Time Comments
t0 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 45ms.
Scenario #2: Initial Start up using On/Off Pin
With Vin previously powered, the unit starts via On/Off pin. See Fig 10.
Time Comments t0 Vin at nominal value.
t1 Arbitrary time when On/Off pin is enabled (Unit enabled)
t2 End of unit turn-on delay
t3 Unit Vout reaches 100% of nominal voltage.
For this example, the unit total start up time (t3- t1) is typically 70ms.
Scenario #3: Turn-off and restart using On/Off Pin
With Vin previously powered, the unit is disabled and then enabled via On/Off pin. See Fig 11.
Time Comments
t0 Vin and Vout are at nominal values, On/Off pin On.
t1 On/Off pin arbitrarily disabled, the unit output falls to zero. Turn-on inhibit delay period (100ms) is initiated, and On/Off pin action is internally inhibited.
t2 On/Off pin is externally re-enabled.
If (t2- t1) ≤ 100ms, external action of On/Off pin Is locked out by start up inhibit timer.
If (t2- t1) > 100ms, On/Off pin is On, the unit begins turn-on; if off, the unit awaits On/Off pin On signal; see Fig 11.
t3 Unit Vout reaches 100% of nominal voltage.
For the condition,
(t2- t1) ≤ 100ms, the unit total start up time (t5- t2) is typically 200ms. For (t2- t1) >
100ms , start up should be typically 45ms after release of On/Off pin.
Fig 9. Start up waveform
Fig 10. Start up using On/Off pin
Fig 11. Turn off and restart using On/Off pin
On/Off Control Power Up/Down
Figure 12. Turn on timing vs. Input On/Off Pin.
Waveform 2 is output voltage, waveform 4 is negative On/Off logic signal. At 48v input voltage, 20A output current with 100uf output capacitance load.
Efficiency
Figure 14. Efficiency at nominal output voltage vs. output current for various Input voltage. The unit
mounted on the 0.06” thick PCB with 300LFM air flow (1.5/m) from pin 3 to pin 4 and Ta=25°C
Figure 13. Turn off timing vs. Input On/Off Pin.
Waveform 2 is output voltage, waveform 4 is negative On/Off logic signal. At 48v input voltage, 20A output current with 100uf output capacitance load.
Dynamic Response
Figure 15. Output voltage dynamic response at Vin=48v Iout= 12~20A, 2.5A/us dynamic load.
waveform 2 is dynamic response via dynamic load. waveform 4 is load current (2.5A/us); with 10uF output capacitance load.
Overshoot
Figure 17. Output voltage over shoot and rise time at
Vin=48v, Iout = 0A; with 100uF output capacitance load, and On/Off pin enabled to turn on the unit.
Figure 16. Output voltage dynamic response at Vin=48v Iout= 12~20A, 2.5A/us dynamic load.
waveform 2 is dynamic response via dynamic load. waveform 4 is load current (2.5A/us); with 2200uF output capacitance load.
Figure 18. Output voltage over shoot and rise time at Vin=48v, Iout=20A; with 100uF output capacitance load, and On/Off enabled to turn on the unit.
Over Current and Short Circuit
Figure 19. Output voltage vs. output current limit point
and the unit shutdown point. Input voltage has almost
no effect on current limit point.
Ripple and Noise
Figure 21. Output voltage Ripple & Noise at Vin=48v,
Iout=0A, with 10uF tantalum cap. and 1uf ceramic
cap. output capacitance load.
Figure 20. Output waveform under short circuit
protection condition. Under 10m? short circuit during
restart at 48Vin.
Figure 22. Output voltage Ripple &Noise, at Vin=48v,
Iout=20A, with 10uF tantalum cap. and 1uf ceramic
cap. output capacitance load.
Temperature derating
Figure 23. Maximum output power derating vs. ambient air temperature with airflow rates of 0LFM through 300 LFM. At Vin=48v. ( without heatsink )
Figure 24. Maximum output power derating vs. ambient air temperature with airflow rates of 0LFM through 300 LFM. At Vin=48v. (Open Frame, without heatsink )
Input reflected ripple current
Figure 25. Test set up for measuring Input reflected ripple currents, i c and i
s.
Figure 26. Input reflected ripple current i
c waveform without input inductor. At Vin=48v, Iout=25A, 50ma/Div. ( current probe w ith 50mv/div )
Figure 27. Input reflected ripple current i
s waveform With 10uH input inductor. At Vin=48v, Iout=25A, 50ma/Div ( current probe with 50mv/div)
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