20W

Technical
S pecification
DQ62412QKA02
48V in
2.45/1.225V
20 Watt
2000Vdc
Quar ter-brick
Input
Outputs
Power
Isolation
DC/DC Conver ter
The DQ62412QKA02 DualQor ™ Kilo series is a dual out put converter that uses the industry standard quarter brick
package size. The very high efficiency is a result of
SynQor’s patented topology that uses synchronous rectifica tion and an innovative construction design to minimize heat
dissipation and allow extremely high power densities. The
power dissipated by the converter is so low that a heatsink
is not required, which saves cost, weight, height, and appli cation effort. All of the power and control components are
mounted to the multi-layer PCB substrate with high-yield sur face mount technology, resulting in a more reliable product.
The Kilo series offers ample power output in an economical
package.
Dual Output
DQ62412QKA02 Module
Operational Features
• High efficiency, > 85% at full rated load current
• Delivers up to 20 Watts of output power with no derating - no heatsink required
• Wide input voltage range: 35V – 75V, with 100V
100ms input voltage transient capability
• Fixed frequency switching provides predictable EMI performance
• No minimum load requirement means no preload resistors required
Mechanical Features
• Industry standard pin-out configuration
• Industry standard size: 1.45” x 2.3” (36.8x58.4mm)
• Total height less than 0.422” (10.72mm), permits better
airflow and smaller card pitch
• Total weight: 1.5 oz. (43 g)
• Flanged pins designed to permit surface mount soldering (avoid wave solder) using FPiP technique
Contr ol Features
• On/Off control referenced to input side (positive and
negative logic options are available)
• Output voltage trim: +10%/-10%, permits custom voltages and voltage margining
Product # DQ62412QKA02
Phone 1-888-567-9596
Pr otection 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
• 2000V, 30 MΩ input-to-output isolation provides
input/output ground separation
• UL/cUL 60950 recognized (US & Canada), basic insulation rating
• TUV certified to EN60950
• 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 flammability requirements
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 1
Input:
Outputs:
Current:
Package:
Technical Specification
MECHANICAL
DIAGRAM
0.38
35-75V
2.45V & 1.225V
20W
Quarter-brick
2.30
(58.4)
(9.7)
2.00
0.500
(50.8)
(12.7)
0.225
0.14
(5.71)
(3.6)
0.025
(.64)
0.700
0.725 1.45
(17.78)
(18.41) (36.8)
Top View
0.350
(8.89)
0.422
(10.72)
Side View
Bottom side
Clearance
See Note 8
0.047+/-0.015
(1.19+/-0.38)
Lowest
Component
0.180
Flanged Pin
See Note 9
Load Board
NOTES
(4.57)
See Note 2
PIN DESIGNATIONS
1) All pins are 0.040” (1.02mm) diameter with 0.080” (2.03
mm) diameter standoff shoulders.
2) Other pin extension lengths available. Recommended pin
length is 0.03” (0.76mm) greater than the PCB thickness.
3) All Pins: Material - Copper Alloy
Finish - Tin/Lead over Nickel plate
4) Undimensioned components are shown for visual reference
only.
5) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
6) Weight: 1.5 oz. (43 g) typical
7) Workmanship: Meets or exceeds IPC-A-610C Class II
8) UL/TUV standards require a clearance greater than 0.04”
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
1.225Vout(+)
1.225V positive output voltage
5
OP RTN
Output Return
6
TRIM
Output voltage trim
7
2.45Vout(+)
2.45V positive output voltage
(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 cores are considered part of
the input/primary circuit.
9) The flanged pins are designed to permit surface mount
soldering (avoiding the wave soldering process) through
the use of the flanged pin-in-paste technique.
Product # DQ62412QKA02
Phone 1-888-567-9596
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 2
Input:
Outputs:
Current:
Package:
Technical Specification
35-75V
2.45V & 1.225V
20W
Quarter-brick
DQ62412QKA02 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=48Vdc 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
100
80
100
2000
100
125
18
V
V
V
V
°C
°C
V
Notes & Conditions
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Non-Operating
Operating
Operating Transient Protection
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
-40
-55
-2
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Lockout Voltage Hysteresis
Maximum Input Current
No-Load Input Current
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 (C\L)
Recommended External Input Capacitance
35
48
75
V
32
28.5
2.5
33
29.5
3.5
34
30.5
4.5
0.8
V
V
V
A
mA
mA
A 2s
mV
mA
mA
A
µF\µH
µF
40
2
150
4
30
2.2\4.7
47
OUTPUT CHARACTERISTICS
Output Voltage Set Point (1.225V)
Output Voltage Set Point (2.45V)
Total Output Voltage Regulation (1.225V)
Total Output Voltage Regulation (2.45V)
Output Voltage Ripple and Noise (1.225V & 2.45V)1
Peak-to-Peak
RMS
Operating Output Current Range (1.225V)
Operating Output Current Range (2.45V)
Output DC Current-Limit Inception (1.225V)
Output DC Current-Limit Inception (2.45V)
Short-Circuit Protection - redundant shutdown (1.225V)
Short-Circuit Protection - redundant shutdown (2.45V)
Output DC Current-Limit Shutdown (1.225\2.45V)
Back-Drive Current Limit while Enabled (1.225V only)
Back-Drive Current Limit while Disabled (1.225V only)
Maximum Output Capacitance (1.225V) - 50/50 split
Maximum Output Capacitance (2.45V) - 50/50 split
1.17
2.35
0
0
17.6
8.8
DYNAMIC CHARACTERISTICS
Input Voltage Ripple Rejection (1.225\2.45V)
Output Voltage during Load Current Transient
For a Step Change in 1.225V Output Current (.1A/µs)
For a Step Change in 2.45V Output Current (.1A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Start-Up Inhibit Time
Output Voltage Overshoot
180
EFFICIENCY
100% Load (20W)
50% Load (10W)
1.225
2.45
50
10
19.2
9.6
25.6
12.8
0.8\1.6
0.5
2
5
0.01
20
1.27
2.70
100
20
16
8
20.8
10.4
2,000
2,000
1000V/ms input transient
RMS thru 10µH inductor; Figures 23 & 25
RMS; Figures 23 & 24
Fast blow external fuse recommended
Internal values, see Figure E
Typical ESR 0.1-0.2Ω, see Figure 23
48Vin, 50% load on each voltage
48Vin, 50% load on each voltage
Cross regulation, line, load, temp; Figures 7 - 10
Cross regulation, line, load, temp; Figures 7 - 10
20MHz bandwidth; Figures 23 & 26
Full Load, see Figures 23 & 26
Full Load, see Figures 23 & 26
Subject to thermal derating; Figures 11 - 18
Subject to thermal derating; Figures 11 - 18
Output Voltage 10% Low; Figures 27 - 28
Output Voltage 10% Low; Figures 27 - 28
Figures 29-30
Figures 29-30
Negative current drawn from output
Negative current drawn from output
20W load; 5% overshoot at Vout at startup
20W load; 5% overshoot at Vout at startup
dB
120 Hz; Figs. 33-34
50
50
400
mV
mV
µs
50% to 75% to 50% Iout max; Figure 21
50% to 75% to 50% Iout max; Figure 22
To within 1% Vout nom
ms
ms
%
Full load, Vout=90% nom.; Figures 19 & 20
-40°C to +125°C; Figure F
20mF load capacitance, Iout = 0A
%
%
48Vin, 50% load each Vout; Figures 1 - 6
48Vin, 25% load each Vout; Figures 1 - 6
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 165°C
See Figures 11 - 18 for derating curves
10
200
0
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance2
mV
mV
A
A
A
A
A
A
V
A
A
µF
µF
100% Load, 35 Vin
85\85
15
240
85
82.5
ISOLATION CHARACTERISTICS
V
V
V
V
Continuous
Continuous
100ms transient, square wave
Basic insulation, Pollution Degree 2
125
125
125
2000
30
3300
V
MΩ
pF
Note 1: 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 # DQ62412QKA02
Phone 1-888-567-9596
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 3
Input:
Outputs:
Current:
Package:
Technical Specification
35-75V
2.45V & 1.225V
20W
Quarter-brick
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
Min.
FEATURE CHARACTERISTICS
Regulation Stage Switching Frequency
Isolation Stage 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 Over-Voltage Protection (1.225V)
Output Over-Voltage Protection (2.45V)
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
Load Current Scale Factor (2.45V rail)
Typ.
Max.
285
142.5
Units
kHz
kHz
-2
2.4
0.8
18
V
V
2.4
-2
18
0.8
V
V
10
V
kΩ
%
V
V
°C
°C
-10
Vin/6
40
115
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
1.46
2.93
120
10
270
Notes & Conditions
+10
125
Figures A & B
Trim-up pins 6-5, Trim-down pins 6-4; Figure C
Over full temp range
Over full temp range
Average PCB Temperature
See App Note: Output Load Current Calc.
10 Hrs. TR-NWT-000332; 80% load,300LFM, 40oC Ta
106 Hrs. MIL-HDBK-217F; 80% load, 300LFM, 40oC Ta
106 Hrs. See website for latest values
6
TBD
2.5
STANDARDS COMPLIANCE
Parameter P
Notes
STANDARDS COMPLIANCE
UL/cUL 60950
EN60950
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, 8kV - NP, 15kV 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
10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis
100g 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 factory for official product family qualification documents.
OPTIONS
PATENTS
SynQor provides various options for Logic Sense, Pin Length and
Feature Set for this family of DC/DC converters. Please consult the
last page of this specification sheet for information on available
options.
SynQor is protected under various patents, including but not limited to U.S. Patent numbers 5,999,417; 6,222,742 B1;
6,594,159 B2; 6,545,890 B2.
Product # DQ62412QKA02
Phone 1-888-567-9596
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 4
35-75V
2.45V & 1.225V
20W
Quarter-brick
Input:
Outputs:
Current:
Package:
Technical Specification
95
5
Power Dissipation (W)
Efficiency (%)
90
85
80
75
70
35V
48V
75V
65
60
4
3
2
35V
48V
75V
1
0
0
4
8
12
16
20
0
4
8
Figure 1: Efficiency vs. output power, from 0 load to full load with 50%
load on 1.225V output and 50% load on 2.45V output at minimum, nominal, and maximum input voltage at 25°C.
95
5.0
Power Dissipation (W)
6.0
Efficiency (%)
90
85
80
75
35 V
48 V
75 V
70
12.8/1.6
9.6/3.2
6.4/4.8
20
3.2/6.4
4.0
3.0
2.0
35 V
48 V
75 V
1.0
0.0
16/0
0/8
Load Current (A), 1.225Vout/2.45Vout
12.8/1.6
9.6/3.2
6.4/4.8
3.2/6.4
0/8
Load Current (A), 1.225Vout/2.45Vout
Figure 3: Efficiency vs. load current, with total output power fixed at
100% (20W) and load current split as shown between 1.225V and 2.45V
outputs at minimum, nominal, and maximum input voltage at 25°C.
Figure 4: Power dissipation vs. load current, with total output power
fixed at 100% (20W) and load current split as shown between 1.225V
and 2.45V outputs at minimum, nominal, and max input voltage at 25°C.
84
Power Dissipation (W)
4
83
Efficiency (%)
16
Figure 2: Power dissipation vs. output power, from 0 load to full load
with 50% load on 1.225V output and 50% load on 2.45V output at minimum, nominal, and maximum input voltage at 25°C.
100
65
16/0
12
Total Output Power (W)
Total Output Power (W)
82
81
25 C
40 C
55 C
80
3
2
1
25 C
40 C
55 C
0
100
200
300
400
Air Flow (LFM)
Figure 5: Efficiency at 60% load and 50/50 power split (4.5A load on
1.225V and 2.5A load on 2.45V) versus airflow rate for ambient air temperatures of 25°C, 40°C.and 55°C.(nominal input voltage).
Product # DQ62412QKA02
Phone 1-888-567-9596
100
200
300
400
Air Flow (LFM)
Figure 6: Power dissipation at 60% load and 50/50 power split (4.5A
load on 1.225V and 2.5A load on 2.45V) versus airflow rate for ambient
air temperatures of 25°C, 40°C.and 55°C.(nominal input voltage).
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 5
RY
A
MIN
I
L
E
PR
1.275
2.65
Input voltage affects cross regulation by maximum of 1mV
1.275
2.65
Input voltage affects cross regulation by maximum of 1mV
1.263
2.55
1.250
2.55
1.238
2.5
1.238
2.5
1.225
2.45
1.225
2.45
1.213
2.4
1.213
2.4
2.35
1.200
1.200
1.225V_48Vin
2.45V_48Vin
1.175
16/0
12.8/1.6
9.6/3.2
6.4/4.8
3.2/6.4
2.35
1.225V_48Vin
2.45V_48Vin
2.3
1.188
2.25
1.175
12/0
0/8
8/2
6/3
4/4
2/5
0/6
IOUT1/IOUT2 (A)
Figure 7: Load regulation vs. load current with power fixed at full load
(20W) and load currents split as shown between 1.225V and 2.45V outputs, at nominal input voltage.
1.275
Figure 8: Load regulation vs. load current with power fixed at 75%
load (15W) and load currents split as shown between 1.225V and 2.45V
outputs, at nominal input voltage.
2.65
Input voltage affects cross regulation by maximum of 1mV
1.275
2.65
Input voltage affects cross regulation by maximum of 1mV
1.263
1.250
2.55
1.250
2.55
1.238
2.5
1.238
2.5
1.225
2.45
1.225
2.45
1.213
2.4
1.213
2.4
2.35
1.200
1.200
1.225V_48Vin
2.45V_48Vin
1.188
1.175
5
7
9
11
13
VOUT1 (V)
2.6
VOUT2 (V)
VOUT1 (V)
2.3
2.25
10/1
IOUT1/IOUT2 (A)
1.263
2.6
2.3
1.188
2.25
1.175
15
2.35
1.225V_48Vin
2.45V_48Vin
2.3
2.25
0
Total Output Power (W)
2.6
VOUT2 (V)
1.188
VOUT1 (V)
2.6
1.250
VOUT2 (V)
VOUT1 (V)
1.263
35-75V
2.45V & 1.225V
20W
Quarter-brick
VOUT2 (V)
Technical Specification
Input:
Outputs:
Current:
Package:
3
7
10
13
16
20
Total Output Power (W)
Figure 9: Load regulation vs. output power from 5W load to 15W with
75% load on 1.225V output and 25% load on 2.45V output at nominal
input voltage.
Figure 10: . Load regulation vs. output power from 3W load to full load
with 25% load on 1.225V output and 75% load on 2.45V output at nominal input voltage.
18
16
14
IOUT (A)
12
10
8
6
400 LFM (2.0 m/s)
4
300 LFM (1.5 m/s)
2
200 LFM (1.0 m/s)
100 LFM (1.0 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (ºC)
Figure 11: Maximum output power-derating curves vs. ambient air temperature for airflow rates of 100 to 400 LFM, air flowing from pin 3 to
pin 1. Full load (16A) on 1.225V output and no load on 2.45V output.
Product # DQ62412QKA02
Phone 1-888-567-9596
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 12: Thermal plot of converter at 16 amp load on 1.225V output
and no load on 2.45V output with 55°C air flowing at 200 LFM. Air
flow across the converter is from pin 3 to pin 1 (nominal input voltage)
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 6
Input:
Outputs:
Current:
Package:
Technical Specification
35-75V
2.45V & 1.225V
20W
Quarter-brick
9
8
7
IOUT (A)
6
5
4
3
400 LFM (2.0 m/s)
2
300 LFM (1.5 m/s)
1
200 LFM (1.0 m/s)
100 LFM (1.0 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (ºC)
Figure 13: Maximum output power-derating curves vs. ambient air temperature for airflow rates of 100 to 400 LFM, air flowing from pin 3 to
pin 1. Full load (8A) on 2.45V output and no load on 1.225V output.
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 14: Thermal plot of converter at 8 amp load on 2.45V output and
no load on 1.225V output with 55°C air flowing at 200 LFM. Air flow
across the converter is from pin 3 to pin 1 (nominal input voltage)
9
8
7
IOUT (A)
6
5
4
3
400 LFM (2.0 m/s)
2
300 LFM (1.5 m/s)
1
200 LFM (1.0 m/s)
100 LFM (1.0 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (ºC)
Figure 15: Max output power-derating curves vs. air temp for 100- 400 LFM,
pin 3 to pin 1. 50% load (8A) on 1.225V output and 50% load (4A) on 2.45V
output. At derating points, 1.225V output decreases while 2.45V output remains
unchanged.
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 16: Thermal plot of converter at 8 amp load on 1.225V output
and 4 amp load on 2.45V output with 85°C air flowing at 200 LFM. Air
flow across the converter is from pin 3 to pin 1 (nominal input voltage)
13
12
11
10
9
IOUT (A)
8
7
6
5
4
3
400 LFM (2.0 m/s)
2
300 LFM (1.5 m/s)
1
200 LFM (1.0 m/s)
100 LFM (1.0 m/s)
0
0
25
40
55
70
85
Ambient Air Temperature (ºC)
Figure 17: Max output power derating curves vs. air temp for 100 to 400 LFM, pin 3 to
pin 1. 75% load (12A) on 1.225V output and 25% load (2A) on 2.45V output. At derating
points, 1.225V output decreases while 2.45V output remains unchanged.
Product # DQ62412QKA02
Phone 1-888-567-9596
Semiconductor junction temperature is
within 1°C of surface temperature
Figure 18: Thermal plot of converter at 12 amp load on 1.225V output
and 2 amp load on 2.45V output with 85°C air flowing at 200 LFM. Air
flow across the converter is from pin 3 to pin 1 (nominal input voltage).
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 7
Input:
Outputs:
Current:
Package:
Technical Specification
35-75V
2.45V & 1.225V
20W
Quarter-brick
2.45Vout
2.45Vout
1.225Vout
1.225Vout
Figure 19: Turn-on transient at full rated load current (resistive load)
(5 ms/div). Input voltage pre-applied. Ch 1: 1.225Vout (500mV/div);
Ch 2: 2.45Vout (1V/div), Ch 3: ON/OFF input (5V/div)
Figure 20: Turn-on transient at zero load current (5 ms/div).
Ch 1: 1.225Vout (500mV/div); Ch 2: 2.45Vout (1V/div)
Ch 3: ON/OFF input (5V/div)
Vout1
Vout1
Iout1
Iout1
Vout2
Vout2
Iout2
Iout2
Figure 21: Output voltage response to step-change in Iout1 (50%-75%-50% of
Imax; dI/dt = 0.1A/µs). Load cap: 15µF, 300 mΩ ESR tantalum cap & 1µF ceramic cap. Vout (100mV/div), Iout (5A/div). Ch1: Vout1(1.225V); Ch2 Iout1; Ch 3:
Vout2(2.45V) ; Ch 4 Iout2
Figure 22: Output voltage response to step-change in Iout2 (50%-75%-50% of
Imax; dI/dt = 0.1A/µs). Load cap: 15µF, 300 mΩ ESR tantalum cap & 1µF ceramic cap.. Vout (50mV/div), Iout (5A/div). Ch1: Vout1(1.225V); Ch2 Iout2; Ch 3:
Vout2(2.45V); Ch 4 Iout2
See Fig. 25
10 µH
source
impedance
See Fig. 24
iS
VSOURCE
See Fig. 26
VOUT2+
iC
100 µF,
<1Ω ESR
electrolytic
capacitor
DC/DC
Converter
VOUT1+
1 µF
ceramic
capacitors
15 µF,
300mΩ ESR
tantalum
capacitors
COM (-)
Figure 23: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 24), Input Reflected Ripple Current
(Figure 25) and Output Voltage Ripple (Figure 26).
Product # DQ62412QKA02
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Figure 24: Input Terminal Ripple Current, 1.225V & 2.45V outputs at
50% rated output current and nominal input voltage with 10µH source
impedance and 100µF electrolytic capacitor (50 mA/div). (see Fig. 23)
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 8
35-75V
2.45V & 1.225V
20W
Quarter-brick
Input:
Outputs:
Current:
Package:
Technical Specification
1.225V
2.45V
Figure 25: Input reflected ripple current, is, through a 10 µH source
inductor at nominal input voltage and rated load current (5 mA/div).
1.225V and 2.45V outputs at 50% rated load current. (see Fig. 23)
Figure 26: Output voltage ripple at nominal input voltage and 50%
rated load current on both outputs (50 mV/div). Load capacitance: 1µF
ceramic cap & 15µF tantalum cap. Bandwidth: 20 MHz. (see Fig. 23)
3.0
1.5
Output Voltage (V)
Output Voltage (V)
2.5
1.0
0.5
2.0
1.5
1.0
35 V
35 V
0.5
48 V
48 V
75 V
75 V
0.0
0.0
0
2
4
6
8
10
12
14
16
18
20
Load Current (A)
0
1
2
3
4
5
6
7
8
9
10
11
12
Load Current (A)
Figure 27: Output voltage vs. load current showing typical current limit
curves and converter shutdown points for the 1.225V output. 2.45V load
is at 0A.
Figure 28: Output voltage vs. load current showing typical current limit
curves and converter shutdown points for the 2.45V output. 1.225V load
is at 0A.
Figure 29: Load current for 1.225V output (10A/div) as a function of
time when the converter attempts to turn on into a 10 mΩ short circuit.
Bottom trace is an expansion of the on-time portion of the top trace.
Figure 30: Load current for 2.45V output (5A/div) as a function of time
when the converter attempts to turn on into a 10 mΩ short circuit. Top
trace is an expansion of the on-time portion of the bottom trace.
Product # DQ62412QKA02
Phone 1-888-567-9596
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 9
Input:
Outputs:
Current:
Package:
Technical Specification
Output Impedance ( )
0.1
Output Impedance ( )
0.1
35-75V
2.45V & 1.225V
20W
Quarter-brick
35 Vin
35 Vin
48 Vin
48 Vin
75 Vin
75 Vin
0.01
0.01
10
100
1,000
10,000
100,000
10
100
Hz
10,000
100,000
Figure 32: Output impedance (Zout2 = Vout2/Iout2) for minimum,
nominal, and maximum input voltage at full rated power, for 2.45V output.
-20
-20
-30
-30
-40
-40
Forward Transmission (dB)
Forward Transmission (dB)
Figure 31: Output impedance (Zout1 = Vout1/Iout1) for minimum,
nominal, and maximum input voltage at full rated power, for 1.225V
output.
-50
-60
-70
-80
-90
48 Vin
75 Vin
-110
-50
-60
-70
-80
-90
35 Vin
-100
35 Vin
48 Vin
-100
75 Vin
-110
10
100
1,000
10,000
100,000
10
100
Hz
-5
-15
-10
-20
Reverse Transmission (dB)
-10
-15
-20
-25
-30
-35
35 Vin
100,000
-25
-30
-35
-40
-45
35 Vin
-50
48 Vin
-45
10,000
Figure 34: Forward Transmission (FT2 = Vout2/Vin) for minimum,
nominal, and maximum input voltage at full rated power, for 2.45V output.
0
-40
1,000
Hz
Figure 33: Forward Transmission (FT1 = Vout1/Vin) for minimum,
nominal, and maximum input voltage at full rated power, for 1.225V
output.
Reverse Transmission (dB)
1,000
Hz
48 Vin
-55
75 Vin
-50
75 Vin
-60
10
100
1,000
10,000
100,000
10
100
Hz
Figure 35: Reverse Transmission (RT1 = Iin/Iout1) for minimum, nominal, and maximum input voltage at full rated power, for 1.225V output.
Product # DQ62412QKA02
1,000
10,000
100,000
Hz
Phone 1-888-567-9596
Figure 36: Reverse Transmission (RT2 = Iin/Iout2) for minimum, nominal, and maximum input voltage at full rated power, for 2.45V output.
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 10
Input:
Outputs:
Current:
Package:
Technical Specification
35-75V
2.45V & 1.225V
20W
Quarter-brick
60
50
Input Impedance ( )
40
30
20
10
0
35 Vin
48 Vin
-10
75 Vin
-20
10
100
1,000
10,000
100,000
Hz
Figure 37: Input impedance (Zin = Vin/Iin) for minimum, nominal, and
maximum input voltage at full rated power.
Product # DQ62412QKA02
Phone 1-888-567-9596
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 11
Input:
Outputs:
Current:
Package:
Technical Specification
BASIC OPERATION AND FEATURES
The DualQor series converter uses a two-stage power conversion topology in which the two output voltages are cross regulated. The first stage is a buck-converter that keeps the output
voltage constant over variations in line, load, and temperature.
The second stage uses a transformer to provide the functions of
input/output isolation and voltage step-down to achieve the low
output voltage required.
The two-stage solution is ideal for converters with multiple crossregulated output voltages. The first-stage compensates for any
variations in line voltage. Therefore, the dependence of the
output voltage on line variations is minimized.
Both the first stage and the second stage switch 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 onstate resistance, dissipate far less energy than Schottky diodes.
This is the primary reason that the DualQor series of converters
has such high efficiency, even at very low output voltages and
very high output currents.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. However, baseplated ver-
sions are available for optional heatsinking in severe thermal environments.
The DualQor series converter uses the industry standard
footprint and pin-out configuration.
The DualQor has many standard control and protection features. All shutdown features are non-latching, meaning that
the converter shuts off for 200 ms before restarting. (See
Figure F)
CONTROL FEATURES
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.
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.
OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits
the user to adjust the output voltage up or down according to
the trim range specifications. It is important to recognize that
adjusting one output will also adjust the second output proportionally. To lower the output voltage, the user should connect a
resistor between Pin 6 and Pin 4. To raise the output voltage,
the user should connect a resistor between Pin 6 and Pin 5. The
following table shows the resistor values needed to trim the outVo(%)
R up
R down
ON/OFF
ON/OFF
ON/OFF
Vin(_)
Vin(_)
Vin(_)
Remote Enable Circuit
Negative Logic
(Permanently Enabled)
ON/OFF
35-75V
2.45V & 1.225V
20W
Quarter-brick
Positive Logic
(Permanently Enabled)
5V
1
54.9
68.1
2
24.9
30.1
3
14.3
17.8
4
9.13
11.5
5
6
7
8
6.34 4.32 2.8 1.69
7.68 5.36 3.48 2.1
Vin(+)
9
825
1.05
10
0.0
0.0
5V
274k
ON/OFF
50k
TTL
TTL/
CMOS
ON/OFF
Vin(_)
Vin(_)
Open Collector Enable Circuit
Vin(_)
Direct Logic Drive
Figure A: Various circuits for driving the ON/OFF pin.
Product # DQ62412QKA02
100pF
50k
Phone 1-888-567-9596
Figure B: Internal ON/OFF pin circuitry
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 12
Input:
Outputs:
Current:
Package:
Technical Specification
put voltage up or down.
Resistor values in Kohms for the desired increase/decrease
(typical) in output voltage (%)
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.
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: The maximum current limit remains
constant as the output voltage drops. However, once the impedance of the short across the output is small enough to make the
output voltage drop below the specified Output DC CurrentLimit Shutdown Voltage, 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.
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 web site
(www.synqor.com) 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.
Vin(+ )
Vin
External
Input
Filter
Electrolytic
Capacitor
47µF
35-75V
2.45V & 1.225V
20W
Quarter-brick
2.45Vout(+ )
Trim
ON/OFF
Iload
Rtrim-up
Cload
OP RTN
or
Rtrim-down
Vin(_)
Cload
1.225 Vout(+ )
Iload
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Product # DQ62412QKA02
Phone 1-888-567-9596
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 13
Input:
Outputs:
Current:
Package:
Technical Specification
35-75V
2.45V & 1.225V
20W
Quarter-brick
L
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.
More detailed information is available in the application note
titled “EMI Characteristics” on the SynQor website.
Vin(+)
C
Vin(_)
Figure E: Internal Input Filter Diagram (values listed on page 3).
Startup Inhibit Period: The Startup Inhibit Period ensures
that the converter will remain off for at least 200ms when it is
shut down for any reason. When an output short is present,
this generates a 5Hz "hiccup mode," which prevents the converter from overheating. In all, there are seven ways that the
converter can be shut down, initiating a Startup Inhibit Period:
• Input Under-Voltage Lockout
• Input Over-Voltage Shutdown (not present in Quarter-brick)
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t0, t1, and t2:
Before time t0, when the input voltage is below the UVL threshold, the unit is disabled by the Input Under-Voltage Lockout feature. When the input voltage rises above the UVL 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.
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.
• Output Over-Voltage Protection
• Over Temperature Shutdown
• Current Limit
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.
• Short Circuit Protection
• Turned off by the ON/OFF input
Vin
Under-Voltage
Lockout Turn-On
Threshold
ON/OFF
(pos logic)
ON
OFF
OFF ON
ON
4ms (typical
Vout
turn on time)
TBDms
(typical start-up
inhibit period)
t0
200ms
200ms
t1
t
t2
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # DQ62412QKA02
Phone 1-888-567-9596
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 14
Input:
Outputs:
Current:
Package:
Technical Specification
35-75V
2.45V & 1.225V
20W
Quarter-brick
PART NUMBERING SYSTEM
ORDERING INFORMATION
The part numbering system for SynQor’s DualQor 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.
DQ 6 24 12 Q K A 02 N K S
Options (see
Ordering Information)
Output Power
Thermal Design/Profile
Performance Level
Package Size
Output Voltage 2
Output Voltage 1
Model Number
Input Voltage
DQ62412QKA02xyz
35 - 75 V
Output
Max Output
Voltages
Power
2.45/1.225 V
20 W
The following option choices must be included in place of
the x y z spaces in the model numbers listed above.
Input Voltage
Options Description: x y z
Product Family
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.
Enable
Logic
Pin
Length
K - 0.110"
P - Positive N - 0.145"
N - Negative R - 0.180"
Y - 0.250"
Feature
Set
S - Standard
Application Notes
A variety of application notes and technical white papers
can be downloaded in pdf format at www.synqor.com.
Contact SynQor for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
Product # DQ62412QKA02
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 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.
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 15