20A/50W

Technical
Specification
PQ60025SMx20
35-75V
100V
2.5V
50W
Input
Transient Input
Output
Max Power
2250V dc Sixteenth-Brick
Isolation
DC-DC Converter
The PQ60025SMx20 PowerQor® Mega sixteenth 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 15).
Operational Features
• High efficiency, 86% at full rated load current
• Delivers up to 50W of output power with minimal derating
• Operating input voltage range: 35-75Vdc, with 100V for 100ms input
transient capability
• Fixed frequency switching provides predictable EMI
• No minimum load requirement
PQ60025SML20 Module
Mechanical Features
•
•
•
•
Industry standard sixteenth-brick pin-out configuration
Size: 0.95" x 1.35" (24.1 x 34.3 mm)
Height: .327" (8.3mm) low profile and .397" (10.1mm) standard
Weight: .476oz (13.5g)
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
Protection Features
•
•
•
•
•
Contents
Safety Features
Pending
• 2250V input-to-output isolation
• UL 60950-1:2003
• CAN/CSA-C22.2 No. 60950-1:2003
• EN60950-1:2001
• Needle Flame Test (IEC 695-2-2)
• IEC 61000-4-2
• RoHS compliant (see page 15)
Product # PQ60025SMx20
Phone 1-888-567-9596
Input under-voltage lockout
Output current limit and short circuit protection
Active back bias limit
Output over-voltage protection
Thermal shutdown
Page No.
PQ60-SMA & SML Mechanical Drawing . . . . . . . . . . . . . . . . . . . . . . . . . 2
PQ60-SMC Mechanical Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PQ60025SMx20 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . 4-5
PQ60025SMx20 Standards & Qualification Testing . . . . . . . . . . . . . . . . . 6
PQ60025SMx20 Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
www.synqor.com
Doc.# 005-0005218 Rev. C
06/28/11
Page 1
Technical
Specification
PQ60025SMx20
Mechanical Drawing
.95 [24.1]
.600 [15.24]
.450 [11.43]
.300 [7.62]
.150 [3.81]
OVERALL HEIGHT
Low Profile
.327 [8.31]
8
7
6 5
4
.145
[3.68]
1.35
[34.3]
1.10
[27.9]
SIDE VIEW
TOP VIEW
.100
[2.54]
1
2
3
.18 [4.4]
.300 [7.62]
.600 [15.24]
BOTTOMSIDE CLEARANCE
Low Profile
.027 ±.015 [0.69 ±0.38]
NOTES
PIN DESIGNATIONS
1) Pins 1-3, 5-7 are 0.040” (1.02mm) diameter, with 0.080”
(2.03mm) diameter standoff shoulders.
Pin
Name
Function
1
Vin(+)
Positive input voltage
2
ON/OFF
3
Vin(–)
2) Pins 4 and 8 are 0.062” (1.57 mm) diameter with 0.100" (2.54
mm) diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin length is
0.03” (0.76mm) greater than the PCB thickness.
4) All Pins: Material - Copper Alloy- Finish (RoHS 6/6) - Matte Tin
over Nickel plate
5) Undimensioned components are shown for visual reference only.
6) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x
+/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7) Weight: .476oz (13.5g)
4
Vout(–)
5
SENSE(–)
6
TRIM
7
SENSE(+)
8
Vout(+)
TTL input to turn converter on and off, referenced to
Vin(–), with internal pull up.
Negative input voltage
Negative output voltage
Negative remote sense(see note 1)
Output voltage trim (see note 2)
Positive remote sense (see note 3)
Positive output voltage
8) Workmanship: Meets or exceeds IPC-A-610C Class II
Notes:
9) Open frame units have flanged pins are designed to permit surface
mount soldering (avoid wave solder) using PiP technique.
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 # PQ60025SMx20
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www.synqor.com
Doc.# 005-0005218 Rev. C
06/28/11
Page 2
Technical
Specification
PQ60025SMx20
PQ60-SMC Mechanical Drawing
1.036±.020 (26.31±0.5)
.600 (15.24)
.450 (11.43)
0.500±.025
(12.7±0.63)
Overall height
.300 (7.62)
.150 (3.81)
8 7 6 5 4
0.18
(4.6)
Top View
1.436±.020
(36.47±0.5)
Side View
1.10
(27.9)
.143±.020
(3.63±0.5)
1
2
3
.300 (7.62)
.218±.020
(5.54±0.5)
.600 (15.24)
NOTES
PIN DESIGNATIONS
1) Pins 1-3, 5-7 are 0.040” (1.02mm) diameter, with 0.080” (2.03mm)
diameter standoff shoulders.
Pin
Name
Function
1
Vin(+)
Positive input voltage
2
ON/OFF
3
Vin(–)
4) All Pins: Material - Copper Alloy- Finish (RoHS 6/6) - Matte Tin over
Nickel plate
4
Vout(–)
5) Undimensioned components are shown for visual reference only.
6
6) All dimensions in inches (mm) Tolerances: x.xx +/-0.02 in. (x.x
+/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm)
7
2)
Pins 4 and 8 are 0.062” (1.57 mm) diameter with 0.100" (2.54 mm)
diameter standoff shoulders.
3) Other pin extension lengths available. Recommended pin length is
0.03” (0.76mm) greater than the PCB thickness.
7) Weight: 1.14oz (32.3g)
8) Workmanship: Meets or exceeds IPC-A-610C Class II
Product # PQ60025SMx20
Phone 1-888-567-9596
5
8
TTL input to turn converter on and off, referenced to
Vin(–), with internal pull up.
Negative input voltage
Negative output voltage
SENSE(–) Negative remote sense(see note 1)
TRIM
Output voltage trim (see note 2)
SENSE(+) Positive remote sense (see note 3)
Vout(+)
Positive output voltage
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.
www.synqor.com
Doc.# 005-0005218 Rev. C
06/28/11
Page 3
Technical
Specification
PQ60025SMx20
PQ60025SMx20 Electrical Characteristics
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc 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.
Typ.
Max.
Units Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
100
V
Continuous
Operating
80
V
Continuous
Operating Transient Protection
100
V
100ms transient
Input to output
Isolation Voltage
2250
V dc
Operating Temperature
Input to Output
-40
100
°C
Storage Temperature
-55
125
°C
Voltage at ON/OFF input pin
-2
8
V
INPUT CHARACTERISTICS
Operating Input Voltage Range
35
48
75
V
Turn-On Voltage Threshold
31.2
32.5
33.8
V
Turn-Off Voltage Threshold
28.9
30.5
32.2
V
1.7
A
50
60
mA
Disabled Input Current
10
14
mA
Response to Input Transient
50
mV
1000V/ms input transient
Input Reflected Ripple Current
3
mA
RMS thru 10μH inductor; Figures 13 & 15
Input Terminal Ripple Current
60
mA
RMS; Figures 13 & 14
Input Under-Voltage Lockout
Lockout Voltage Hysteresis
2.0
Maximum Input Current
No-Load Input Current
V
Recommended Input Fuse
20
Recommended External Input Capacitance
Input Filter Component Values (L\C)
100% Load, Vin min, nominal Vout
A
100
µF
1.0/2.35
µH/µF
Typical ESR 0.1-0.2 Ω
Internal values; see Figure E
OUTPUT CHARACTERISTICS
Output Voltage Set Point
2.475
2.5
2.525
V
Output Voltage Regulation
Over Line
±0.1/2.5
+0.3/7.5
%/mV
Over Load
±0.1/2.5
+0.3/7.5
%/mV
-38
38
mV
2.438
2.563
V
25
50
mV
Full load
5
10
mV
Full load
20
A
Subject to thermal derating; Figures 5 - 8
27
A
Figure 17
A
Negative current drawn from output
mA
Negative current drawn from output
mF
Vout nominal at full load (resistive load); See Note 2
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise
Over sample, line, load, temperature & life
20 MHz bandwidth; Figures 13 & 16; see Note 1
Peak-to-Peak
RMS
Operating Output Current Range
0
Output DC Current-Limit Inception
22
25
Back-Drive Current Limit while Enabled
2.4
Back-Drive Current Limit while Disabled
2
Maximum Output Capacitance
10
EFFICIENCY
100% Load
86
%
See Figure 1 for efficiency curve
50% Load
85
%
See Figure 1 for efficiency curve
Note 1: For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (email: [email protected])
Note 2: Recommended minimum output capacitance is 100uF
Product # PQ60025SMx20
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Doc.# 005-0005218 Rev. C
06/28/11
Page 4
Input: 48V
Output: 2.5V
Current: 20A
Technical Specification
PQ60025SMx20 Electrical Characteristics (continued)
Ta = 25 °C, airflow rate = 300 LFM, Vin = 48V dc 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.
Typ.
Max.
Units Notes & Conditions
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection
75
dB
120 Hz; Figure 20
Step Change in Output Current (0.1 A/µs)
75
mV
50% to 75% to 50% Iout max; Figure 11
Step Change in Output Current (2 A/µs)
125
mV
50% to 75% to 50% Iout max; Figure 12
Settling Time
100
µs
To within 1% Vout nom
ms
Full load, Vout=90% nom.
ms
Figure F; See Note 1
Output Voltage during Load Current Transient
Turn-On Transient
Turn-On Time
35
Start-Up Inhibit Time
180
200
250
Power-Up Inhibit Time
2
ms
Figure F
Output Voltage Overshoot
0
%
Max output capacitance and full load
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
2250
Isolation Resistance
Isolation Capacitance (input to output)
30
MΩ
1000
pF
See Note 2
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
125
°C
Package rated to 150 °C
Board Temperature
125
°C
UL rated max operating temp 130 °C
Transformer Temperature
125
°C
See Figure 2 for derating curve
385
kHz
FEATURE CHARACTERISTICS
Switching Frequency
315
350
ON/OFF Control (Option P)
On-State Voltage
2.4
8
V
Off-State Voltage
-2
0.8
V
On-State Voltage
-2
0.8
V
Off-State Voltage
2.4
8
V
ON/OFF Control (Option N)
ON/OFF Control (Either option)
Figures A & B
Pull-Up Voltage
4.5
Pull-Up Resistance
5
5.5
10
Output Voltage Trim Range
-10
Output Voltage Remote Sense Range
Output Over-Voltage Protection
2.9
3.1
V
kΩ
10
%
10
%
Measured across Pins 8 & 4
3.4
V
Over full temp range
Average PCB Temperature; Auto Recovery
Over-Temperature Shutdown OTP Trip Point
125
°C
Over-Temperature Shutdown Restart Hysteresis
10
°C
Measured across Pins 8 & 4; Figure C
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia) TR-NWT-000332
3.9
Calculated MTBF (MIL-217) MIL-HDBK-217F
3.5
Field Demonstrated MTBF
106 Hrs.
106 Hrs.
106 Hrs. See our website for details
Note 1: Maximum value is 400ms for DC current limit and short circuit fault conditions
Note 2: Higher values of isolation capacitance can be added external to the module.
Product # PQ60025SMx20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005218 Rev. C
06/28/11
Page 5
Technical
Specification
PQ60025SMx20
PQ60025SMx20 Standards & Qualification Testing
Parameter
Notes & Conditions
STANDARDS COMPLIANCE
UL 60950-1:2003
Basic Insulation
CAN/CSA-C22.2 No. 60950-1:2003
EN60950-1:2001
Needle Flame Test (IEC 695-2-2)
Test on entire assembly; board & plastic components UL94V-0 compliant
IEC 61000-4-2
ESD test, 8 kV - NP, 15 kV air - NP (Normal Performance)
Note: 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.
Parameter
# Units
Test Conditions
QUALIFICATION TESTING
Life Test
32
95% rated Vin and load, units at derating point, 1000 hours
Vibration
5
10-55 Hz sweep, 0.060" total excursion, 1 min./sweep, 120 sweeps for 3 axis
Mechanical Shock
5
100g minimum, 2 drops in x and y axis, 1 drop in z axis
Temperature Cycling
10
-40 °C to 100 °C, unit temp. ramp 15 °C/min., 500 cycles
Power/Thermal Cycling
5
Toperating = min to max, Vin = min to max, full load, 100 cycles
Design Marginality
5
Tmin-10 °C to Tmax+10 °C, 5 °C steps, Vin = min to max, 0-105% load
Humidity
5
Solderability
Product # PQ60025SMx20
85 °C, 85% RH, 1000 hours, continuous Vin applied except 5 min/day
15 pins
Phone 1-888-567-9596
MIL-STD-883, method 2003
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Doc.# 005-0005218 Rev. C
06/28/11
Page 6
Input: 48V
Output: 2.5V
Current: 20A
Technical Specification
100
89
95
88
87
85
Efficiency (%)
Efficiency (%)
90
80
75
86
85
25º C
70
35Vin
48 Vin
75 Vin
65
55º C
83
60
0
2
4
6
8
10
12
14
16
18
100
20
Load Current (A)
200
300
400
Air Flow (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).
12
8
10
7
Power Dissipation (W)
Power Dissipation (W)
40º C
84
8
6
4
35Vin
48 Vin
2
6
5
4
25º C
40º C
3
55º C
75 Vin
2
0
0
2
4
6
8
10
12
14
16
18
100
20
200
300
400
Air Flow (LFM)
Load Current (A)
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).
25
Iout(A)
20
15
10
400LFM(2.0m/s)
300LFM(1.5m/s)
5
200LFM(1.0m/s)
100LFM(0.5 m/S)
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 # PQ60025SMx20
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Figure 6: Thermal plot of converter at 20.0 amp load current (50.0W) with 55°C
air flowing at the rate of 200 LFM. Air is flowing from pin 3 to pin 1 (nominal
input voltage).
www.synqor.com
Doc.# 005-0005218 Rev. C
06/28/11
Page 7
Input: 48V
Output: 2.5V
Current: 20A
Technical Specification
25
Iout(A)
20
15
10
400LFM(2.0m/s)
300LFM(1.5m/s)
5
200LFM(1.0m/s)
100LFM(0.5 m/S)
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 lenghtwise from
input to output (nominal input voltage).
Figure 8: Thermal plot of converter at 20.0 amp load current (50.0W) 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) (10 ms/div). Input
voltage pre-applied. Top Trace: Vout (1V/div). Bottom Trace: ON/OFF
input(5V/div)
Figure 10: Turn-on transient at zero load (10 ms/div). Top Trace: Vout (1V/div).
Bottom Trace: 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: 100µF electrolytic output
capacitance. Top trace: Vout (100mV/div). Bottom trace: Iout (5A/div).
Figure 12: Output voltage response to step-change in load current (50%75%-50% of Iout(max): dI/dt = 2A/µs). Load cap: 330µF electrolytic output
capacitance. Top trace: Vout (200mV/div). Bottom trace: Iout (5A/div).
Product # PQ60025SMx20
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Doc.# 005-0005218 Rev. C
06/28/11
Page 8
Input: 48V
Output: 2.5V
Current: 20A
Technical Specification
See
Fig.
15
See
Fig.
14
10µH
source
impedance
See
Fig.
16
DC/DC
Converter
Vsource
Vout
1µF
ceramic
capacitor
100µF
< 1Ω ESR
electrolytic
capacitor
100µF
100mΩ
ESR
electrolytic
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 100µF electrolytic
capacitor (Ch1 100mA/div). (See Figure 13).
Figure 15: Input reflected ripple current, is, through a 10 µH source inductor at
nominal input voltage and rated load current (5 mA/div). (See Figure 13).
Figure 16: Output voltage ripple at nominal input voltage and rated load
current (20 mV/div). Load capacitance: one 1.0µF ceramic capacitor and one
100µF electrolytic capacitor. Bandwidth: 20 MHz. (See Figure 13).
6
Output Voltage (V)
5
4
3
2
35 Vin
1
48Vin
75 Vin
0
0
10
20
30
40
Load Current (A)
Figure 17: Output voltage vs. load current showing typical current limit curves
and converter shutdown points.
Product # PQ60025SMx20
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Figure 18: Load current (20A/div) as a function of time when the converter
attempts to turn on into a 1 mΩ short circuit. Top trace (100ms/div) is an
expansion of the on-time portion of the bottom trace.
www.synqor.com
Doc.# 005-0005218 Rev. C
06/28/11
Page 9
Input: 48V
Output: 2.5V
Current: 20A
Technical Specification
0
0.1
Forward Transmission (dB)
Output Impedance (ohms)
1
0.01
0.001
35Vin
48Vin
0.0001
-20
-40
-60
-80
35Vin
48Vin
75Vin
-100
75Vin
0.00001
-120
10
100
1,000
10,000
100,000
10
100
Figure 19: Magnitude of incremental output impedance (Zout = vout/iout) for
minimum, nominal, and maximum input voltage at full rated power.
10,000
100,000
Figure 20: Magnitude of incremental forward transmission (FT = vout/vin) for
minimum, nominal, and maximum input voltage at full rated power.
10
1000
0
Input Impedance (Ohms)
Reverse Transmission (dB)
1,000
Hz
Hz
-10
-20
-30
35Vin
48Vin
-40
100
10
1
35Vin
48Vin
75Vin
75Vin
-50
0.1
10
100
1,000
10,000
100,000
10
100
1,000
Hz
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.
12
8
6
4
Vout trim-up (%)
10
+85°C
+25°C
2
-40°C
0
36
35.5
35
34.5
34
Input Voltage (V)
Figure 23: Achievable trim-up percentage vs. input voltage at +85°C, +25°C,
and -40°C (all at full load). Full trim-up percentage is achieved at loads of 50%
or less across full temperature and input voltage range.
Product # PQ60025SMx20
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www.synqor.com
Doc.# 005-0005218 Rev. C
06/28/11
Page 10
Technical
Specification
PQ60025SMx20
BASIC OPERATION AND FEATURES
CONTROL FEATURES
This 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 converter has such high efficiency, even at very low
output voltages and very high output currents.
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(-).
The ON/OFF signal is active low (meaning that a low turns the
converter on). Figure A details four possible circuits for driving
the ON/OFF pin. Figure B is a detailed look of the internal ON/
OFF circuitry.
These converters are offered totally encased to withstand harsh
environments and thermally demanding applications. Dissipation
throughout the converter is so low that it does not require a
heatsink for operation in many applications; however, adding
a heatsink provides improved thermal derating performance in
extreme situations.
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.
This series of converters uses the industry standard footprint
and pin-out configuration.
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 datasheet,
that is
[Vout(+) - Vout(-)] – [Vsense(+) - Vsense(-)] <
Sense Range % x Vout
ON/OFF
ON/OFF
Vin(_)
Vin(_)
Remote Enable Circuit
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.
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.
Negative Logic
(Permanently Enabled)
5V
ON/OFF
TTL/
CMOS
ON/OFF
10k
Vin(_)
Vin(_)
Open Collector Enable Circuit
5V
Direct Logic Drive
ON/OFF
50k
TTL
Figure A: Various circuits for driving the ON/OFF pin.
1000pF
Vin(_)
Figure B: Internal ON/OFF pin circuitry
Product # PQ60025SMx20
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Technical
Specification
PQ60025SMx20
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 =
- 10.22
(511
∆% )
(kΩ)
where
∆% =
Vnominal – Vdesired
Vnominal
x 100%
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 =
where
(
5.11VOUT x (100+∆%)
1.225∆%
_ 511 _ 10.22
∆%
)
(kΩ)
Vout = Nominal Output Voltage
Graphs on Page 3 show 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.
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.
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 “0” on our website. 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 specifications 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: If the output current exceeds the
Output Current Limit threshold, the converter turns off. 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.
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.
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.
Product # PQ60025SMx20
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Technical
Specification
PQ60025SMx20
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 provides a typical circuit
diagram which details the input filtering and voltage trimming.
Vin(+)
Vin
Vsense(+)
Electrolytic
Capacitor
External
Input
Filter
Vout(+)
Trim
ON/OFF
Vsense(_)
Vin(_)
Rtrim-up
or
Rtrim-down
Cload
Iload
Vout(_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Input Filtering and External Capacitance: Figure E 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 electrolytic
input capacitor. The recommended external input capacitance
is specified in the Input Characteristics section on the Electrical
Characteristics page. More detailed information is available in
the application note titled “EMI Characteristics” on the SynQor
website.
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 200 ms when it is
shut down for any reason. When an output short is present, this
generates a 5 Hz “hiccup mode,” which prevents the converter
from overheating. In all, there are six ways that the converter
can be shut down, initiating a Startup Inhibit Period:
• Input Under-Voltage Lockout
• Output Over-Voltage Protection
• Over Temperature Shutdown
L
• Current Limit
Vin(+)
• Short Circuit Protection
• Turned off by the ON/OFF input
C
Vin(_)
Figure E: Internal Input Filter Diagram (component values
listed on the specifications page).
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Technical
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PQ60025SMx20
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t0, t1, and t2:
At time t1, the unit is disabled by the ON/OFF pin, and it cannot
be enabled again until the Startup Inhibit Period has elapsed.
Before time t0, when the input voltage is below the UVLO
threshold, the unit is disabled by the Input Under-Voltage Lockout
feature. When the input voltage rises above the UVLO threshold,
the Input Under-Voltage Lockout is released, and a Startup Inhibit
Period is initiated. At the end of this delay, the ON/OFF pin is
evaluated, and since it is active, the unit turns on.
When the ON/OFF pin goes high after t2, the Startup Inhibit
Period has elapsed, and the output turns on within the typical
Turn-On Time.
Vin
Under-Voltage
Lockout
Turn-On
Threshold
ON/OFF
(neg logic)
ON
OFF ON
OFF
ON
35ms (typical
Vout
turn on time)
2ms
(typical power-up
inhibit period)
t1
t0
200ms
200ms
t
t2
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # PQ60025SMx20
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06/28/11
Page 14
Technical
Specification
PQ60025SMx20
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s 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 characters for options.
Add “-G” to the model number for 6/6 RoHS compliance.
PQ 6 0 02 5 S M L 2 0 N R S - G
6/6 RoHS
Options
(see
Ordering Information)
Output Current
Thermal Design
Performance Level
Model Number
Input
Voltage
Output
Voltage
Max Output
Current
PQ60025SMw20xyS
35-75V
2.5V
20A
The following options must be included in place of the w x y z
spaces in the model numbers listed above.
Package Size
Options Description: w x y z
Output Voltage
Thermal Design
Input Voltage
A - Open Frame
L - Low Profile
C - Encased with
Threaded Baseplate
Product Family
The first 12 characters comprise the base part number and
the last 3 characters indicate available options. The “-G”
suffix indicates 6/6 RoHS compliance.
Application Notes
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 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]
Enable Logic
Pin Style
Feature Set
N - Negative
P - Positive
K - 0.110"
N - 0.145"
R - 0.180"
Y - 0.250"
S - Standard
Not all combinations make valid part numbers, please contact
SynQor for availability. See the Product Summary web page for
more options.
PATENTS
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
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # PQ60025SMx20
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
Warranty
SynQor offers a two (2) 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.
www.synqor.com
Doc.# 005-0005218 Rev. C
06/28/11
Page 15
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