35A/87.5W

Technical
Specification
PQ60025ETL35
48 V
2.5 V
35 A
2250 V dc
Input
Output
Current
Isolation
Eighth-brick
DC-DC Converter
The PQ60025ETL35 PowerQor® Tera Eighth-brick converter
is a next-generation, board-mountable, isolated, fixed
switching frequency dc-dc converter that uses synchronous
rectification to achieve extremely high conversion efficiency. The power dissipated by the converter is so low that a
heatsink is not required, which saves cost, weight, height,
and application effort. All of the power and control
components are mounted to the multi-layer PCB substrate
with high-yield surface mount technology. Since the
PowerQor converter has no explicit thermal interfaces, it is
extremely reliable. RoHS Compliant (see page 13).
Operational Features
• High efficiencies, 88% at full rated load current
• Delivers up to 35 A of output current with minimal derating
- no heatsink required
• Wide input voltage range: 35V – 75 V, with 100 V 100 ms
input voltage transient capability
• Fixed frequency switching provides predictable EMI
performance
• No minimum load requirement means no preload
resistors required
Mechanical Features
• Industry standard Eighth-brick pin-out configuration
• Standard size: 0.90" x 2.3" (22.9x58.4 mm)
• Total height only 0.320" (8.13mm), permits better airflow
and smaller card pitch
• Total weight: 0.85 oz (24 g)
• Flanged pins designed to permit surface mount soldering
(avoid wave solder) using FPiP technique
Control Features
• On/Off control referenced to input side (positive and
negative logic options are available)
• Remote sense for the output voltage compensates for
output distribution drops
• Output voltage trim permits custom voltages and voltage margining
Product # PQ60025ETL35
Phone 1-888-567-9596
PQ60025ETL35 Module
Protection Features
• Input under-voltage lockout disables converter at low input
voltage conditions
• Output current limit and short circuit protection protects
converter and load from permanent damage and
consequent hazardous conditions
• Active back bias limit prevents damage to converter from
external load induced pre-bias
• Output over-voltage protection protects load from
damaging voltages
• Thermal shutdown protects converter from abnormal
environmental conditions
Safety Features
• 2250 V, 30 MW input-to-output isolation
• UL 60950-1 recognized (US & Canada), basic insulation
rating
• TUV certified to EN60950-1
• Meets 72/23/EEC and 93/68/EEC directives which facilitates
CE Marking in user’s end product
• Board and plastic components meet UL94V-0 standard
• RoHS compliant (see last page)
www.synqor.com
Doc.# 005-2ET625F Rev. B
5/28/08
Page 1
Input:
Output:
Current:
Package:
Technical Specification
35V – 75 V
2.5 V
35 A
Eighth-brick
MECHANICAL DIAGRAM
2.30
0.450
(58.4)
(11.43)
2.00
0.14
(50.8)
0.300
(7.62)
(3.6)
0.15
0.150
Top View
(3.8)
(3.81)
1
8
2
7
6
3
5
4
0.600
(15.24)
0.900 +0.022
0.300
(22.86 +0.55)
(7.62)
0.600
0.320 +0.015
(15.24)
(8.13 +0.38)
Overall Height
0.145
(3.68)
See Note 3
Side View
0.016 +0.015
(0.41 +0.38)
Bottom Side Clearance
Lowest
Component
Flanged Pin
See Note 10
Load Board
PIN DESIGNATIONS
NOTES
1)Pins 1-3, 5-7 are 0.040" (1.02mm) diameter with 0.080" (2.03 mm)
diameter standoff shoulders.
2)Pins 4 and 8 are 0.062" (1.57 mm) diameter with 0.100" (2.54 mm)
diameter standoff shoulders.
3)Recommended pin length is 0.03" (0.76mm) greater than the PCB
thickness. Other pin lengths available.
4)All Pins: Material - Copper Alloy; Finish - Matte Tin over Nickel plate
5)Undimensioned components shown are for visual reference only.
6)Weight: 0.85 oz. (24 g) typical
7)All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
8)Workmanship: Meets or exceeds current IPC-A-610C Class II
9)UL/TUV standards require a clearance greater than 0.04”
(1.02mm) between input and output for Basic insulation. This
issue should be considered if any copper traces are on the top side
of the user’s board. Note that the ferrite core shown at left above
is considered part of the input/primary circuit and that the two
ferrite cores shown at the right above are considered part of the
output/secondary circuit.
10)The flanged pins are designed to permit surface mount soldering
(allowing to avoid the wave soldering process) through the use of the
flanged pin-in-paste technique.
Pin
No.
Name
Function
1
Vin (+)
Positive input voltage
2
ON/OFF
TTL input to turn converter
on and off, referenced to
Vin (-) with internal pull up
3
Vin (-)
Negative input voltage
4
Vout (-)
Negative output voltage
5
SENSE (-)
Negative remote sense 1
6
TRIM
7
SENSE (+)
Positive remote sense 3
8
Vout (+)
Positive output voltage
Output voltage trim 2
Notes:
1. SENSE(–) should be connected to Vout(–) either remotely or at the
converter.
2. Leave TRIM pin open for nominal output voltage.
3. SENSE(+) should be connected to Vout(+) either remotely or at the
converter.
Product # PQ60025ETL35
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2ET625F Rev. B
5/28/08
Page 2
Input:
Output:
Current:
Package:
Technical Specification
35V – 75 V
2.5 V
35 A
Eighth-brick
PQ60025ETL35 electrical characteristics
TA = 25 °C, airflow rate = 300 LFM, VIN = 48 VDC unless otherwise noted; full operating temperature range is -40 °C to +100 °C ambient
temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
35
Operating Transient Protection
Isolation Voltage
Input to Output
Operating Temperature
-40
Storage Temperature
-55
Voltage at ON/OFF input pin
-2
INPUT CHARACTERISTICS
Operating Input Voltage Range
35
Input Under-Voltage Lockout
Turn-On Voltage Threshold
31.5
Turn-Off Voltage Threshold
29.6
Lockout Voltage Hysteresis
1.9
Maximum Input Current
No-Load Input Current
0
Disabled Input Current
Inrush Current Transient Rating
Response to Input Transient
Input Reflected Ripple Current
Input Terminal Ripple Current
Recommended Input Fuse
Input Filter Component Values (L\C)
Recommended External Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage Set Point
2.475
Output Voltage Regulation
Over Line
Over Load
Over Temperature
Total Output Voltage Range
2.43
Output Voltage Ripple and Noise1
Peak-to-Peak
RMS
Operating Output Current Range
0
Output DC Current-Limit Inception
40
Output DC Current-Limit Shutdown Voltage
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance Electrolytic
Minimum Output Capacitance
Maximum Output Capacitance Ceramic
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
Output Voltage during Load Current Transient
For a Step Change in Output Current (0.1A/µs)
For a Step Change in Output Current (0.3A/µs)
Settling Time
Turn-On Transient
Turn-On Time
6
Start-Up Inhibit Time
9
Restart Inhibit Time
190
Output Voltage Overshoot
EFFICIENCY
100% Load
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Typ.
Max. Units Notes & Conditions
100
75
100
2250
100
125
18
V
V
V
Vdc
°C
°C
V
Continuous
Continuous
100 ms transient, square wave
Basic Insulation, Pollution Degree 2
48
75
V
32.6
30.6
2.0
46
6
7.5
1.9
75
47
33.7
31.6
2.1
3.0
75
10
0.01
20
1.0 \ 3.3
V
V
V
A
mA
mA
A 2s
mV
mA
mA
A
µH\µF
µF
2.500
2.525
V
+0.1 \ 2.5
+0.2 \ 5.0
+15
2.500
20
7
44
1.5
12
10
+38
2.57
50
50
35
48
50
33
5
%\mV
%\mV
mV
V
mV
mV
A
A
V
A
mA
mF
mF
70
dB
120 Hz; Figure 20
100
100
80
mV
mV
µs
50% to 75% to 50% Iout max; Figure 11
50% to 75% to 50% Iout max; Figure 12
To within 1% Vout nom
9
12
200
0
12
17
210
ms
ms
ms
%
Full load, Vout=90% nom.; Figures 9 & 10
-40°C to +125°C; Figure F
-40°C to +125°C; Figure F
No load capacitance, Iout = 0A
88
90
%
%
Figures 1 - 4
Figures 1 - 4
125
125
125
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
See Figures 5 - 8 for derating curves
100% Load, 35 Vin, nominal Vout
1000V/ms input transient
RMS thru 10 µH inductor; Figures 13 & 15
RMS; Figures 13 & 14
Fast blow external fuse recommended
Internal values; see Figure E
Typical ESR 0.1-0.2 Ω; see Figure 13
Over sample, line, load, temperature & life
20MHz bandwidth; Figures 13 & 16
Full Load; see Figures 13 & 16
Full Load; see Figures 13 & 16
Subject to thermal derating; Figures 5 - 8
Output Voltage 10% Low
Negative current drawn from output
Negative current drawn from output
2.5Vout at 35A Resistive Load
Not applicable
2.5Vout at 35A Resistive Load
Note 1: Output voltage ripple can exceed maximum specification during startup when output voltage is less than 1.2V. Additional output capacitance will mitigate this
startup ripple behavior. For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 2: Higher values of isolation capacitance can be added external to the module.
Product # PQ60025ETL35
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2ET625F Rev. B
5/28/08
Page 3
Input:
Output:
Current:
Package:
Technical Specification
35V – 75 V
2.5 V
35 A
Eighth-brick
PQ60025ETL35 ELECTRICAL CHARACTERISTICS (Continued)
TA = 25 °C, airflow rate = 300 LFM, VIN = 48 VDC unless otherwise noted; full operating temperature range is -40 °C to +100 °C
ambient temperature with appropriate power derating. Specifications subject to change without notice.
Parameter
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance2
FEATURE CHARACTERISTICS
Switching Frequency
ON/OFF Control (Option P)
Off-State Voltage On-State Voltage
ON/OFF Control (Option N)
Off-State Voltage
On-State Voltage
ON/OFF Control (Either Option)
Pull-Up Voltage
Pull-Up Resistance
Output Voltage Trim Range
Output Voltage Remote Sense Range
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
Calculated MTBF (MIL-217) MIL-HDBK-217F
Field Demonstrated MTBF
Min.
Typ.
Max. Units Notes & Conditions
2250
30
3300
V
MΩ
pF
317
333
350
kHz
-2
2.4
0.8
18
V
V
2.4
-2
-20
120
10
148
120
10
18
0.8
5
+10
+10
160
V
V
V
kΩ
%
%
%
°C
°C
2.42
2.27
Figures A & B
Measured across Pins 8 & 4; Figure C
Measured across Pins 8 & 4
Over full temp range; % of nominal Vout
Average PCB Temperature
106 Hrs. 80% load,300LFM, 40oC Ta
106 Hrs. 80% load, 300LFM, 40oC Ta
106 Hrs. See our website for latest values
Note 1: Output voltage ripple can exceed maximum specification during startup when output voltage is less than 1.2V. Additional output capacitance will mitigate this
startup ripple behavior. For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected])
Note 2: Higher values of isolation capacitance can be added external to the module.
STANDARDS COMPLIANCE
Parameter P
Notes
STANDARDS COMPLIANCE
UL/cUL 60950-1 EN60950-1 72/23/EEC
93/68/EEC
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
GR-1089-CORE
Telcordia (Bellcore) GR-513
File # E194341, Basic insulation, Pollution Degree 2
Certified by TUV
Test on entire assembly; board & plastic components UL94V-0 compliant
ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance)
Section 7 - electrical safety, Section 9 - bonding/grounding
• An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website.
QUALIFICATION TESTING
Parameter P
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
# Units
32
5
5
10
5
5
5
15 pins
Test Conditions
95% rated Vin and load, units at derating point, 1000 hours
10-55 Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100 g minimum, 2 drops in x and y axis, 1 drop in z axis
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Toperating = min to max, Vin = min to max, full load, 100 cycles
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
85 °C, 85% RH, 1000 hours, 2 minutes on and 6 hours off
MIL-STD-883, method 2003
• Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply robust, reliable product. Contact the factory for official product family qualification documents.
Product # PQ60025ETL35
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2ET625F Rev. B
5/28/08
Page 4
Input:
Output:
Current:
Package:
95
93
90
92
85
91
Efficiency (%)
Efficiency (%)
Technical Specification
80
75
35 Vin
48 Vin
75 Vin
70
35V – 75 V
2.5 V
35 A
Eighth-brick
90
89
25 C
40 C
55 C
88
87
65
0
5
10
15
20
25
30
100
35
200
Load Current (A)
300
400
Airflow (LFM)
Figure 1: Efficiency at nominal output voltage vs. load current for minimum,
nominal, and maximum input voltage at 25°C.
Figure 2: Efficiency at nominal output voltage and 60% rated power vs.
airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal
input voltage).
14
7
6
10
Efficiency (%)
Power Dissipation (W)
12
8
6
4
5
4
25 C
40 C
55 C
35 Vin
48 Vin
2
75 Vin
3
0
0
5
10
15
20
25
30
35
Load Current (A)
100
200
300
400
Airflow (LFM)
Figure 3: Power dissipation at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
Figure 4: Power dissipation at nominal output voltage and 60% rated power
vs. airflow rate for ambient air temperatures of 25°C, 40°C, and 55°C (nominal input voltage).
40
35
30
Iout (A)
25
20
15
400 LFM (2.0 m/s)
10
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
5
100 LFM (0.5 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (°C)
Figure 5: Maximum output power-derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing from pin
3 to pin 1(nominal input voltage).
Product # PQ60025ETL35
Phone 1-888-567-9596
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Figure 6: Thermal plot of converter at 35 amp load current (87.5W) with
55°C air flowing at the rate of 200 LFM. Air is flowing across the converter
from 3 to pin 1 (nominal input voltage).
Doc.# 005-2ET625F Rev. B
5/28/08
Page 5
Input:
Output:
Current:
Package:
Technical Specification
35V – 75 V
2.5 V
35 A
Eighth-brick
40
35
30
Iout (A)
25
20
15
400 LFM (2.0 m/s)
10
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
5
100 LFM (0.5 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (°C)
Figure 7: Maximum output power derating curves vs. ambient air temperature for airflow rates of 100 LFM through 400 LFM with air flowing across
the converter from pin input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 35 amp load current (87.5W) with
55°C air flowing at the rate of 200 LFM. Air is flowing across the converter
from input to output (nominal input voltage).
Figure 9: Turn-on transient at full load (resistive load) (4 ms/div). Load cap:
10uF, 100 mΩ ESR tantalum capacitor and 1uF ceramic capacitor. Input
voltage pre-applied. Ch 1: Vout (1V/div), Ch 2: ON/OFF input (5V/div).
Figure 10: Turn-on transient at zero load (4 ms/div). Load cap: 10uF,
100 mΩ ESR tantalum capacitor and 1uF ceramic capacitor. Ch 1: Vout (1V/
div), Ch 2: ON/OFF input (5V/div).
Figure 11: Output voltage response to step-change in load current
(50%-75%-50% of Iout(max); dI/dt = 0.1A/µs). Load cap: 10µF, 100 mΩ ESR
tantalum cap and 1µF ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout (10A/div).
Figure 12: Output voltage response to step-change in load current
(50%-75%-50% of Iout(max): dI/dt = 0.3 A/µs). Load cap: 10µF, 100 mΩ
ESR tantalum cap and 1µF ceramic cap. Ch 1: Vout (100mV/div), Ch 2: Iout
(10A/div).
Product # PQ60025ETL35
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2ET625F Rev. B
5/28/08
Page 6
Input:
Output:
Current:
Package:
Technical Specification
35V – 75 V
2.5 V
35 A
Eighth-brick
See Fig. 15
10 µH
source
impedance
See Fig. 14
See Fig. 16
iS
VSOURCE
iC
47 µF,
<1W ESR
electrolytic
capacitor
dc-dc
Converter
VOUT
1 µF
15 µF,
ceramic 100mW ESR
capacitor
tantalum
capacitor
Figure 13: Test set-up diagram showing measurement points for Input Terminal
Ripple Current (Figure 14), Input Reflected Ripple Current (Figure 15) and
Output Voltage Ripple (Figure 16).
Figure 14: Input Terminal Ripple Current, ic, at full rated output current and
nominal input voltage with 10µH source impedance and 47µF electrolytic capacitor (100 mA/div). Bandwidth: 250MHz. See Figure 13.
Figure 15: Input reflected ripple current, is, through a 10 µH source inductor,
using a 47µF electrolytic input capacitor (2mA/div). Bandwidth: 250MHz. See
Figure 13.
Figure 16: Output voltage ripple at nominal input voltage and rated load current (20 mV/div). Load capacitance: 1µF ceramic capacitor and 15µF tantalum
capacitor. Bandwidth: 20 MHz. See Figure 13.
12
11
Vout Trim-up (%)
10
9
8
7
6
5
4
+80 ºC
+25 ºC
3
-40 ºC
2
40.0
39.5
39.0
38.5
38.0
37.5
37.0
36.6
36.0
35.5
35.0
Input Voltage (V)
Figure 17: Output voltage response to step-change in input voltage (50V to 100V in
8µS), at 17.5A load current. Load cap: 15µF 100mW ESR tantalum capacitor and 1uF
ceramic cap. Ch 1: Vout (50mV/div), Ch 2: Vin (20V/div).
Product # PQ60025ETL35
Phone 1-888-567-9596
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Figure 18: Maximum trim up vs. input voltage at different temperatures
Vin=35.0~40.0 V.
Doc.# 005-2ET625F Rev. B
5/28/08
Page 7
Input:
Output:
Current:
Package:
Technical Specification
35V – 75 V
2.5 V
35 A
Eighth-brick
0
1
Forward Transmission (dB)
Output Impedance (ohms)
-10
0.1
0.01
35 Vin
0.001
48 Vin
-20
-30
-40
-50
-60
-70
35 Vin
-80
48 Vin
75 Vin
-90
0.0001
75 Vin
-100
10
100
1,000
10,000
100,000
10
100
Hz
1,000
10,000
100,000
Hz
Figure 19: Magnitude of incremental output impedance (Zout = Vout/Iout) for
minimum, nominal, and maximum input voltage at full rated power.
Figure 20: Magnitude of incremental forward transmission (FT = Vout/Vin) for
minimum, nominal, and maximum input voltage at full rated power.
5
100
Input Impedance (ohms)
Reverse Transmission (dB)
-5
-15
-25
-35
-45
10
1
35 Vin
35 Vin
48 Vin
48 Vin
75 Vin
75 Vin
0.1
-55
10
100
1,000
10,000
100,000
Hz
10
100
1,000
10,000
100,000
Hz
Figure 21: Magnitude of incremental reverse transmission (RT = Iin/Iout) for
minimum, nominal, and maximum input voltage at full rated power.
Figure 22: Magnitude of incremental input impedance (Zin = Vin/Iin) for minimum, nominal, and maximum input voltage at full rated power.
Figure 23: Output voltage vs. load current showing typical current limit curves and
converter shutdown points.
Product # PQ60025ETL35
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2ET625F Rev. B
5/28/08
Page 8
Input:
Output:
Current:
Package:
Technical Specification
BASIC OPERATION AND FEATURES
35V – 75 V
2.5 V
35 A
Eighth-brick
In the positive logic version, the ON/OFF input is active high
(meaning that a high turns the converter on). In the negative
logic version, the ON/OFF signal is active low (meaning that a
low turns the converter on). Figure A details five possible circuits
for driving the ON/OFF pin. Figure B is a detailed look of the
internal ON/OFF circuitry.
The single stage power converter switches at a fixed frequency for predictable EMI performance. Rectification of
the transformer’s output is accomplished with synchronous
rectifiers. These devices, which are MOSFETs with a very low
on-state resistance, dissipate far less energy than Schottky
diodes. This is the primary reason that the PowerQor converter has such high efficiency, even at very low output voltages and very high output currents.
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs
correct for voltage drops along the conductors that connect
the converter’s output pins to the load.
Dissipation throughout the converter is so low that it does
not require a heatsink for operation. Since a heatsink is not
required, the PowerQor converter does not need a metal
baseplate or potting material to help conduct the dissipated
energy to the heatsink. The PowerQor converter can thus be
built more simply and reliably using high yield surface mount
techniques on a PCB substrate.
Pin 7 should be connected to Vout(+) and Pin 5 should be
connected to Vout(-) at the point on the board where regulation is desired. A remote connection at the load can adjust
for a voltage drop only as large as that specified in this
The PowerQor series of eighth-brick, quarter-brick and halfbrick converters uses the industry standard footprint and
Sense Range % x Vout
datasheet, that is
[Vout(+) - Vout(-)] – [Vsense(+) - Vsense(-)] < Pins 7 and 5 must be connected for proper regulation of
the output voltage. If these connections are not made, the
converter will deliver an output voltage that is slightly higher
than its specified value.
pin-out configuration.
CONTROL FEATURES
Note: the output over-voltage protection circuit senses the
voltage across the output (pins 8 and 4) to determine when
it should trigger, not the voltage across the converter’s sense
leads (pins 7 and 5). Therefore, the resistive drop on the
board should be small enough so that output OVP does not
trigger, even during load transients.
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits
the user to control when the converter is on or off. This input is
referenced to the return terminal of the input bus, Vin(-). There
are two versions of the converter that differ by the sense of the
logic used for the ON/OFF input.
ON/OFF
ON/OFF
ON/OFF
Vin(-)
Vin(-)
Vin(-)
Remote Enable Circuit
5V
ON/OFF
ON/OFF
ON/OFF
Vin(-)
Vin(-)
Open Collector Enable Circuit
10k
50k
TTL
TTL/
CMOS
100pF
Vin(-)
Direct Logic Drive
Figure A: Various circuits for driving the ON/OFF pin.
Product # PQ60025ETL35
5V
Positive Logic
Negative Logic
(Permanently Enabled) (Permanently Enabled)
Phone 1-888-567-9596
Figure B: Internal ON/OFF pin circuitry
www.synqor.com
Doc.# 005-2ET625F Rev. B
5/28/08
Page 9
Input:
Output:
Current:
Package:
Technical Specification
OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits
the user to adjust the output voltage across the sense leads
up or down according to the trim range specifications.
To decrease the output voltage, the user should connect
a resistor between Pin 6 and Pin 5 (SENSE(-) input). For a
desired decrease of the nominal output voltage, the value of
the resistor should be
Rtrim-down = 511 - 10.22 (kW)
D%
( )
where
D%
= Vnominal – Vdesired x 100%
Vnominal
To increase the output voltage, the user should connect a
resistor between Pin 6 and Pin 7 (SENSE(+) input). For a
desired increase of the nominal output voltage, the value of
the resistor should be
Rtrim-up =
(
5.11VOUT(100+D%) 511
_
1.225D%
D%
)
_ 10.22 (kW)
where
VOUT = Nominal Output Voltage
Figure C graphs the relationship between the trim resistor
value and Rtrim-up and Rtrim-down, showing the total range
the output voltage can be trimmed up or down.
Total DC Variation of Vout: For the converter to meet its
full specifications, the maximum variation of the DC value of
Vout, due to both trimming and remote load voltage drops,
should not be greater than that specified for the output voltage trim range.
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed
to turn off when the input voltage is too low, helping avoid
an input system instability problem, described in more detail
in the application note titled “Input System Instability”. The
lockout circuitry is a comparator with DC hysteresis. When
the input voltage is rising, it must exceed the typical Turn-On
Voltage Threshold value (listed on the specification page)
before the converter will turn on. Once the converter is on,
the input voltage must fall below the typical Turn-Off Voltage
Threshold value before the converter will turn off.
Output Current Limit: Once the output current reaches
the current-limit inception point, the converter will decrease
the output voltage as the output current increases. However,
once the impedance of the short across the output is small
enough to make the output voltage drop below the specified
Output DC Current-Limit Shutdown Voltage, the converter
turns off (see Figure 23).
The converter then enters a “hiccup mode” where it repeatedly turns on and off at a 5 Hz (nominal) frequency with a
5% duty cycle until the short circuit condition is removed.
This prevents excessive heating of the converter or the load
board.
Output Over-Voltage Limit: If the voltage across the
output pins exceeds the Output Over-Voltage Protection
threshold, the converter will immediately stop switching. This
prevents damage to the load circuit due to 1) excessive series resistance in output current path from converter output
pins to sense point, 2) a release of a short-circuit condition,
or 3) a release of a current limit condition. Load capacitance
determines exactly how high the output voltage will rise in
response to these conditions. After 200 ms the converter will
automatically restart.
10,000.0
Trim Resistance (kOhms)
35V – 75 V
2.5 V
35 A
Eighth-brick
1,000.0
100.0
10.0
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
% Increase in Vout
% Decrease in Vout
Figure C: Trim Graph for 2.5Vout module
Note: the TRIM feature does not affect the voltage at which
the output over-voltage protection circuit is triggered. Trimming the output voltage too high may cause the over-voltage
protection circuit to engage, particularly during transients.
It is not necessary for the user to add capacitance at the
Trim pin. The node is internally bypassed to eliminate noise.
Product # PQ60025ETL35
Phone 1-888-567-9596
Over-Temperature Shutdown: A temperature sensor on
the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the
converter off when the temperature at the sensed location
reaches the Over-Temperature Shutdown value. It will allow
the converter to turn on again when the temperature of the
sensed location falls by the amount of the Over-Temperature
Shutdown Restart Hysteresis value.
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Doc.# 005-2ET625F Rev. B
5/28/08
Page 10
Input:
Output:
Current:
Package:
Technical Specification
APPLICATION CONSIDERATIONS
Input System Instability: This condition can occur because any dc-dc converter appears incrementally as a negative resistance load. A detailed application note titled “Input
System Instability” is available on the SynQor website which
provides an understanding of why this instability arises, and
shows the preferred solution for correcting it.
Application Circuits: Figure D below provides a typical
circuit diagram which details the input filtering and voltage
trimming.
Input Filtering and External Capacitance: Figure E
below provides a diagram showing the internal input filter
components. This filter dramatically reduces input terminal
ripple current, which otherwise could exceed the rating of
an external input electrolytic capacitor. The recommended
external input capacitance is specified in the “Input Characteristics” section. More detailed information is available
in the application note titled “EMI Characteristics” on the
SynQor website.
Vin(+)
Vin
External
Input
Filter
Vout(+)
Vsense(+)
Electrolytic
Capacitor 47µF
35V – 75 V
2.5 V
35 A
Eighth-brick
ON/OFF
Trim
Vsense(_)
Vin(_)
Rtrim-up
or
Rtrim-down
Cload
Iload
Vout(_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
L
Vin(+)
C
Vin(_)
Figure E: Internal Input Filter Diagram (component values listed on the specifications page).
Product # PQ60025ETL35
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Doc.# 005-2ET625F Rev. B
5/28/08
Page 11
Input:
Output:
Current:
Package:
Technical Specification
35V – 75 V
2.5 V
35 A
Eighth-brick
Startup/Restart Inhibit Period: The Restart Inhibit
Period ensures that the converter will remain off for approximately 200ms once it is shut down. When an output short is
present, this generates a 5Hz “hiccup mode,” which prevents
the converter from overheating. In all, there are five ways
that the converter can be shut down that initiate a Restart
Inhibit Period:
At time t1, the input voltage falls below the Input UnderVoltage Lockout threshold. This disables the unit and initiates
a Restart Inhibit Period. During the Restart Inhibit Period, if
the input voltage again exceeds the UVLO threshold, the unit
cannot be enabled again until the Restart Inhibit Period has
elapsed. Once this occurs, the output turns on with the Typical Turn-On Time.
• Input Under-Voltage Lockout
At time t2, the ON/OFF pin disables the unit and initiates a
Restart Inhibit Period. During the Restart Inhibit Period, if the
ON/OFF pin is again activated, the unit cannot be enabled
again until the Restart Inhibit Period has elapsed. Once this
occurs, the output turns on with the Typical Turn-On Time.
• Output Over-Voltage Protection
• Over Temperature Shutdown
• Current Limit
When the ON/OFF pin goes high after t3, and the Restart
Inhibit Period has elapsed, the output turns on approximately
1.6ms after the ON/OFF pin is activated, with the Typical
Turn-On Time.
• Turned off by the ON/OFF input
Figure F shows turn-on scenarios, where a Restart Inhibit
Period is initiated at t1, t2, and t3:
A Startup Inhibit Period is initiated when the input voltage is
brought up from zero voltage during initial startup, beginning
as the input voltage reaches approximately 10V. At the end
of the Startup Inhibit Period (typically 10ms), if the ON/OFF
pin has been active for at least 1ms, and the input voltage is
above the Under-Voltage Lockout threshold, the output turns
on with the Typical Turn-On Time. This is shown at time t0.
If the Under-Voltage Lockout threshold has not been satisfied at the end of either Inhibit Period, the unit will remain
disabled until the input voltage exceeds the UVLO threshold.
Once this occurs, the output turns on with the Typical TurnOn Time.
If the ON/OFF pin is activated after either Inhibit Period has
elapsed, the output will turn on approximately 1.6ms after
the ON/OFF pin is activated, with the Typical Turn-On Time.
Vin
Under-Voltage
Lockout TurnOn Threshold
ON/OFF
(pos logic)
ON
Vout
OFF
OFF ON
ON
10ms
15ms
(typical start-up
inhibit period)
(typical restart
inhibit period)
t1
200ms
200ms
200ms
t0
(typical turn on time)
t2
t
t3
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # PQ60025ETL35
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Doc.# 005-2ET625F Rev. B
5/28/08
Page 12
Input:
Output:
Current:
Package:
Technical Specification
35V – 75 V
2.5 V
35 A
Eighth-brick
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s PowerQor dc-dc converters follows the format shown in the example below.
The tables below show the valid model numbers and ordering
options for converters in this product family. When ordering
SynQor converters, please ensure that you use the complete
15 character part number consisting of the 12 character base
part number and the additional 3 characters for options.
A “-G” suffix indicates the product is 6/6 RoHS compliant.
P Q 60 0 25 E T L 3 5 N N S -G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Output Max Output
Model Number
Input Voltage Voltage
Current
PQ60018ETL45xyz-G
35 - 75 V
1.8 V
45 A
PQ60025ETL35xyz-G
35 - 75 V
2.5 V
35 A
PQ60033ETL30xyz-G
35 - 75 V
3.3 V
30 A
Thermal Design
Performance Level
Package Size
Output Voltage
The following option choices must be included in place of the
x y z spaces in the model numbers listed above.
Input Voltage
Product Family
Options Description: x y z
The first 12 characters comprise the base part number and the
last 3 characters indicate available options. Although there
are no default values for enable logic and pin length, the most
common options are negative logic and 0.145” pins. These
part numbers are more likely to be readily available in stock
for evaluation and prototype quantities. A “-G” suffix indicates
the product is 6/6 RoHS compliant.
A variety of application notes and technical white papers can
be downloaded in pdf format from our website.
RoHS Compliance: The EU led RoHS (Restriction of
Hazardous Substances) Directive bans the use of Lead,
Cadmium, Hexavalent Chromium, Mercury, Polybrominated
Biphenyls (PBB), and Polybrominated Diphenyl Ether (PBDE)
in Electrical and Electronic Equipment. This SynQor product
is available as 6/6 RoHS compliant. For more information
please refer to SynQor’s RoHS addendum available at our
RoHS Compliance / Lead Free Initiative web page or e-mail us at [email protected]
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # PQ60025ETL35
Pin Length
Feature Set
P - Positive
N - Negative
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Standard
PATENTS
Application Notes
Enable Logic
978-849-0600
888-567-9596
978-849-0602
[email protected]
www.synqor.com
155 Swanson Road
Boxborough, MA 01719
USA
Phone 1-888-567-9596
SynQor holds the following patents, one or more of which
might apply to this product:
5,999,417
6,594,159
6,927,987
7,119,524
6,222,742
6,731,520
7,050,309
7,269,034
6,545,890
6,894,468
7,072,190
7,272,021
6,577,109
6,896,526
7,085,146
7,272,023
Warranty
SynQor offers a three (3) year limited warranty. Complete warranty
information is listed on our website or is available upon request from
SynQor.
Information furnished by SynQor is believed to be accurate and
reliable. However, no responsibility is assumed by SynQor for its use,
nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of SynQor.
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Doc.# 005-2ET625F Rev. B
5/28/08
Page 13
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