SynQor IQ24280HEC14NRS Half-brick dc-dc converter Datasheet

Technical
Specification
IQ24280HEC14
18-36 V
Input
28 V
Output
14 A
Current
2250 Vdc
Isolation
Half-brick
DC-DC Converter
The IQ24280HEC14 InQor™ Exa converter is an isolated, fixed switching frequency DC-DC converter that
uses synchronous rectification to achieve extremely high
efficiency and power density. The 24 Vin modules feature 2,250 Vdc isolation and low common mode noise. The Exa series converters offer industry leading useable
output power for any standard “half-brick” module.
RoHS compliant (see last page).
IQ24280HEC14 Module
Operational Features
• Ultra-high efficiency, 93% at full rated load current,
95% at half rated load current
• Delivers up to 14 A of output current (392 W)
• Wide input voltage range: 18 – 36 V, with 50 V 100
ms input voltage transient capability
• Fixed frequency switching provides predictable EMI
performance
• No minimum load requirement means no preload resistors required
• Wide output voltage trim range (-50% to +20%), see
trim section
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 damage and consequent hazardous conditions
• Active back bias limit provides smooth startup with
external load induced pre-bias
• Latching output over-voltage protection protects load
from damaging voltages
• Thermal shutdown protects converter from abnormal
environmental conditions
Mechanical Features
•
•
•
•
Industry standard half-brick pin-out configuration
Brick size: 2.39" x 2.49" (63.1 x 60.6 mm)
Total height only 0.512" (13 mm)
Total weight: 4.3 oz. (123 grams)
Control Features
• On/Off control referenced to input side
Product # IQ24280HEC14
Phone 1-888-567-9596
Safety Features
• 2250 V, 30 MW input-to-output isolation provides
input/output ground separation
• UL/cUL 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 flammability requirements
www.synqor.com
Doc.# 005-IHE2428 Rev. B
09/19/08
Page 1
Input:
Output:
Current:
Package:
Technical Specification
18-36 V
28 V
14 A (392 W)
Half-brick
MECHANICAL
DIAGRAM
2.49 (63.1)
2.00 (50.8)
1.400 (35.56)
0.24
1.000 (25.40)
0.700 (17.78)
0.400 (10.16)
(6.2)
0.512 +0.002/-0.005
(13 +0.05/-0.12)
Overall height
9
8
7 6
5
0.145 typ.
(3.68)
0.24
2.39
(6.2)
(60.6)
Top View
1.90
(48.3)
Side View
1.90
(48.3)
M3 Threaded Standoff
4 Places
0.23
(5.9)
1
2
3
4
0.54 (13.8)
0.400 (10.16)
1.000 (25.40)
1.400 (35.56)
0.027 +0.007/-0.010
(0.69 +0.17/-0.25)
Bottom side
Clearance
PIN DESIGNATIONS
NOTES
1) Applied torque per screw should not exceed 6in-lb. (0.7 Nm)
2) Baseplate flatness tolerance is 0.004" (0.10 mm) TIR for surface
3) Pins 1, 2, 4, 6-8, are 0.040" (1.02mm) diameter with 0.080"
(2.03 mm) diameter standoff shoulders
4) Pins 5, 9 are 0.080" (2.03 mm) diameter shoulderless pins.
5) Other pin extension lengths available
6) All Pins: Material - Copper Alloy
Finish - Matte Tin over Nickel plate
7) Undimensioned components are shown for visual reference only.
8) Weight: 4.3 oz. (123 g) typical
9) All dimensions in inches (mm)
Tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm)
x.xxx +/-0.010 in. (x.xx +/-0.25mm)
10) Workmanship: Meets or exceeds IPC-A-610C Class II
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
Reserved
Not connected
4
Vin(-)
Negative input voltage
5
Vout(-)
Negative output voltage
6
SENSE(-)
Return remote sense
7
TRIM
Output voltage trim
8
SENSE(+)
Positive remote sense
9
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.
Product # IQ24280HEC14
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-IHE2428 Rev. B
09/19/08
Page 2
Input:
Output:
Current:
Package:
Technical Specification
18-36 V
28 V
14 A (392 W)
Half-brick
IQ24280HEC14 ELECTRICAL CHARACTERISTICS
TA=25°C, airflow rate=300 LFM, Vin=24 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
Operating Transient Protection
Isolation Voltage (input to output)
Operating Temperature
Storage Temperature
Voltage at ON/OFF input pin
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
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
Output Voltage Regulation
Over Line1
Over Load1
Over Temperature
Total Output Voltage Range
Output Voltage Ripple and Noise2
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output DC Current-Limit Shutdown Voltage3
Back-Drive Current Limit while Enabled
Back-Drive Current Limit while Disabled
Maximum Output Capacitance
DYNAMIC CHARACTERISTICS
Output Voltage during Load Current Transient
For a Step Change in Output C urrent (0.1 A/µs)
For a Step Change in Output Current (5 A/µs)
Settling Time
Turn-On Transient
Turn-On Time
Output Voltage Overshoot
EFFICIENCY
100% Load
50% Load
TEMPERATURE LIMITS FOR POWER DERATING CURVES
Semiconductor Junction Temperature
Board Temperature
Transformer Temperature
ISOLATION CHARACTERISTICS
Isolation Voltage (dielectric strength)
Isolation Resistance
Isolation Capacitance4
Note
Note
Note
Note
1:
2:
3:
4:
Typ.
-40
-55
-2
Max.
Units
50
40
50
2250
100
125
18
V
V
V
V
°C
°C
V
Continuous
Continuous
100 ms transient, square wave
Basic insulation, Pollution Degree 2
50 V transient for 100 ms
18
24
36
V
16.5
15.0
1.0
17.0
15.5
1.5
17.5
16.0
2.0
30
400
125
V
V
V
A
mA
mA
V
mA
mA
A
µH\µF
µF
300
100
1.5
5
250
0.34\23
470
27.22
28.00
+0.25\70
+0.25\70
+0.215
27.15
110
25
0
16
17.5
11.5
4
3
3
0
20
40
28.75
V
+0.560
28.82
%\mV
%\mV
V
V
210
55
14
19
6
4
5
1.5
1.5
8
24
37
40
5
93
95
125
125
125
2250
30
1000
mV
mV
A
A
V
A
mA
mF
Notes & Conditions
100% Load, 18 Vin, trimmed up 20%
0.25 V/µs input transient
RMS thru 3.3 µH inductor
RMS
Fast blow external fuse recommended
Internal values; see Figure E
Typical ESR 0.1-0.2 W
Over sample, line, load, temperature & life
20 MHz bandwidth
Full Load
Full Load
Subject to thermal derating
Output Voltage 10% Low
Negative current drawn from output source
Negative current drawn from output source
14A Resistive Load
V
V
ms
50% to 75% to 50% Iout max, 200 µF load cap
“
To within 1% Vout nom
ms
%
Full load, ON/OFF to Vout=90% nom.
No load, 5 mF load cap
%
%
Figures 1 & 2
Figures 1 & 2
°C
°C
°C
Package rated to 150°C
UL rated max operating temp 130°C
V
MW
pF
Line and load regulation is limited by duty cycle quantization and does not indicate a shift in the internal voltage reference.
For applications requiring reduced output voltage ripple and noise, consult SynQor applications support (e-mail: [email protected]).
If the output voltage falls below the Output DC Current Limit Shutdown Voltage for more than 50ms, then the unit will enter into hiccup mode, with a 500ms off-time.
Higher values of isolation capacitance can be added external to the module.
Product # IQ24280HEC14
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-IHE2428 Rev. B
09/19/08
Page 3
Input:
Output:
Current:
Package:
Technical Specification
18-36 V
28 V
14 A (392 W)
Half-brick
ELECTRICAL CHARACTERISTICS (Continued)
Parameter P
FEATURE CHARACTERISTICS
Switching Frequency Regulation Stage
Switching Frequency Isolation Stage
ON/OFF Control (Option N)
Off-State Voltage
On-State Voltage
ON/OFF Control
ON/OFF Control Hysteresis
Pull-Up Voltage
Pull Up Resistance
Output Voltage Trim Range
Output Over-Voltage Protection
Over-Temperature Shutdown
Over-Temperature Shutdown Restart Hysteresis
RELIABILITY CHARACTERISTICS
Calculated MTBF (Telcordia)
Calculated MTBF (MIL-217)
Field Demonstrated MTBF
STANDARDS COMPLIANCE
Parameter
STANDARDS COMPLIANCE
UL/cUL 60950-1
EN60950-1
Needle Flame Test (IEC 695-2-2)
IEC 61000-4-2
Min.
Typ.
Max.
Units
232
116.0
235
117.5
237
118.5
kHz
kHz
18
1.0
V
V
4.0
-2
4.75
-50
125
1.5
5.00
10
130
120
10
TBD
TBD
5.25
+20
135
V
V
kW
%
%
°C
°C
106 Hrs.
106 Hrs.
106 Hrs.
Notes & Conditions
Over sample, temp & life
Over sample, temp & life
Measured across Pins 9 & 5; see trim section
Over full temp range; % of nominal Vout
Average PCB Temperature
TR-NWT-000332; 80% load,300LFM, 40ºC Ta
MIL-HDBK-217F; 80% load, 300LFM, 40ºC Ta
See website for details
Notes & Conditions
File # E194341, Basic insulation
Certified by TUV
Test on entire assembly; board & plastic components UL94V-0 compliant
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.
QUALIFICATION TESTING
Parameter
QUALIFICATION TESTING
Life Test
Vibration
Mechanical Shock
Temperature Cycling
Power/Thermal Cycling
Design Marginality
Humidity
Solderability
Product # IQ24280HEC14
# Units
32
5
5
10
5
5
5
15 pins
Phone 1-888-567-9596
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
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, continuous Vin applied except 5 min/day
MIL-STD-883, method 2003
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Doc.# 005-IHE2428 Rev. B
09/19/08
Page 4
Input:
Output:
Current:
Package:
Technical Specification
100
18-36 V
28 V
14 A (392 W)
Half-brick
60
95
50
Power Dissipation (W)
Efficiency (%)
90
85
80
75
70
18 Vin
24 Vin
36 Vin
65
40
30
20
18 Vin
24 Vin
10
36 Vin
0
60
0
2
4
6
8
10
12
0
14
2
4
6
Load Current (A)
Figure 1: Efficiency at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
10
12
14
Figure 2: Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25°C.
16
16
14
14
12
12
10
10
Iout (A)
Iout (A)
8
Load Current (A)
8
8
6
6
400 LFM (2.0 m/s)
4
400 LFM (2.0 m/s)
4
300 LFM (1.5 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
2
200 LFM (1.0 m/s)
2
100 LFM (0.5 m/s)
100 LFM (0.5 m/s)
0
0
25
40
55
70
25
85
40
55
70
85
Ambient Air Temperature (°C)
Ambient Air Temperature (°C)
Figure 3: Encased converter (without heatsink) max. output power derating vs.
ambient air temperature for airflow rates of 100 LFM through 400 LFM. Air flows
across the converter from input to output (nominal input voltage).
Figure 4: Encased converter (with 1/2” heatsink) max. output power derating vs.
ambient air temperature for airflow rates of 100 LFM through 400 LFM. Air flows
across the converter from input to output (nominal input voltage).
Figure 5: Turn-on transient at full load (resistive load) (10 ms/div).
Ch 1: Vout (5 V/div)
Ch 2: ON/OFF input (5 V/div)
Figure 6: Turn-on transient at zero load (10 ms/div).
Ch 1: Vout (5 V/div)
Ch 3: ON/OFF input (5 V/div)
Product # IQ24280HEC14
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Doc.# 005-IHE2428 Rev. B
09/19/08
Page 5
Input:
Output:
Current:
Package:
Technical Specification
Figure 7: Output voltage response to step-change in load current
(50%-75%-50% of Iout(max); dI/dt = 0.1 A/μs; 1 ms/div). Load cap: 1 uF
ceramic and 100 μF, 15 mW ESR electrolytic capacitors. Top trace: Vout
(1 V/div). Bottom trace: Iout (10 A/div).
Figure 11
3.3 µH
source
impedance
Figure 8: Output voltage response to step-change in load current
(50%-75%-50% of Iout(max): dI/dt = 5 A/µs; 2 ms/div). Load cap: 100 µF,
15 mW ESR electrolytic capacitor. Top trace: Vout (1.0 V/div). Bottom trace:
Iout (10 A/div).
Figure 10
Figure 12
iS
VSOURCE
18-36 V
28 V
14 A (392 W)
Half-brick
iC
470 µF,
0.2W ESR
electrolytic
capacitor
DC-DC
Converter
VOUT
1 µF
ceramic
capacitor
100 µF,
10mW ESR
electrolytic
capacitor
Figure 9: Test set-up diagram showing measurement points for Input
Terminal Ripple Current (Figure 10), Input Reflected Ripple Current
(Figure 11) and Output Voltage Ripple (Figure 12).
Figure 10: Input Terminal Ripple Current, ic, at full rated output current and nominal input voltage with 3.3 µH source impedance and
470 µF electrolytic capacitor (200 mA/div; 2 µs/div). See Figure 9.
Figure 11: Input reflected ripple current, is, through a 3.3 µH source
inductor, using a 470 µF input capacitor, at nominal input voltage and
rated load current (10 mA/div; 2 µs/div). See Figure 9.
Figure 12: Output voltage ripple at nominal input voltage and rated load
current (50 mV/div; 2 µs/div). Load capacitance: 1 µF ceramic capacitor
and 100 µF electrolytic capacitor. Bandwidth: 20 MHz. See Figure 9.
Product # IQ24280HEC14
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09/19/08
Page 6
Input:
Output:
Current:
Package:
Technical Specification
Figure 13: Output voltage response to step-change in input voltage
(18 V to 36 V in 200 µs; 400 µs/div). Load cap: 470 µF, 15 mW ESR
electrolytic capacitor. Top trace: Vin (5.0 V/div). Bottom trace: Vout
(1.0 V/div), at zero load current.
18-36 V
28 V
14 A (392 W)
Half-brick
Figure 14: Load current (10 A/div; 20 ms/div) as a function of time
when the converter attempts to turn on into a 1 mW short circuit.
37
35
33
Output Voltage (V)
31
29
27
25
23
21
19
17
18 Vin
15
24 Vin
13
36 Vin
11
9
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
Load Current (A)
Figure 15: Output voltage vs. load current showing typical current
limit curves and OVP shutdown point.
Product # IQ24280HEC14
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Doc.# 005-IHE2428 Rev. B
09/19/08
Page 7
Input:
Output:
Current:
Package:
Technical Specification
18-36 V
28 V
14 A (392 W)
Half-brick
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The converter series uses a two-stage power conversion topology.
The first stage 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 stepdown to achieve the low output voltage required.
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(-).
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 on-state resistance,
dissipate significantly less energy than Schottky diodes, enabling
the converter to achieve high efficiency.
The series of half-brick, quarter-brick and eighth-brick converters
uses the industry standard footprint and pin-out configuration.
ON/OFF
Remote Enable Circuit
Negative Logic
(Permanently Enabled)
5V
ON/OFF
CMOS
Vin(_)
Vin(_)
Open Collector Enable Circuit
Pin 8 should be connected to Vout(+) and Pin 6 should be connected to Vout(-) at the point on the board where regulation is desired.
If these connections are not made, the converter will deliver an
output voltage that is slightly higher than its specified value.
OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits the
user to adjust the output voltage across the sense leads up or
down according to the trim range specifications. SynQor uses
industry standard trim equations.
Vin(_)
ON/OFF
REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Note: The output over-voltage protection circuit senses the voltage
across the sense leads (pins 8 and 6) to determine when it should
trigger, not the voltage across the converter’s output pins (pins 9
and 5).
ON/OFF
Vin(_)
The ON/OFF signal is active low (meaning that a low voltage
turns the converter on). Figure A details four possible circuits for
driving the ON/OFF pin.
Direct Logic Drive
To decrease the output voltage, the user should connect a resistor
between Pin 7 (TRIM) and Pin 6 (SENSE(–) input). For a desired
decrease of the nominal output voltage, the value of the resistor
should be:
Rtrim-down =
Phone 1-888-567-9596
kW
where
Figure A: Various circuits for driving the ON/OFF pin.
Product # IQ24280HEC14
(100%
)_2
∆
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∆% =
Vnominal – Vdesired
Vnominal
Doc.# 005-IHE2428 Rev. B
x 100%
09/19/08
Page 8
Input:
Output:
Current:
Package:
Technical Specification
To increase the output voltage, the user should connect a resistor
between Pin 7 (TRIM) and Pin 8 (SENSE(+) input). For a desired
increase of the nominal output voltage, the value of the resistor
should be
Rtrim-up =
– 2) x V
( Vnominal
1.225
DES
+ VNOM
kW
VDES – VNOM
Figure B graphs the relationship between the trim resistor value,
Rtrim-up and Rtrim-down, showing the total range the output voltage can be trimmed up or down.
100,000.0
Trim Resistance (kOhms)
10,000.0
18-36 V
28 V
14 A (392 W)
Half-brick
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed
to turn off when the input voltage is too low, helping to avoid
an input system instability problem, which is described in more
detail in the application note titled “Input System Instability” on
the SynQor 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* 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
DC Current Limit Inception” point*, then a fast linear current limit
controller will reduce the output voltage to maintain a constant
output current. If as a result, the output voltage falls below the
“Output DC Current Limit Shutdown Voltage”* for more than
50 ms, then the unit will enter into hiccup mode, with a 500 ms
off-time. The unit will then automatically attempt to restart.
Back-Drive Current Limit: If there is negative output current
of a magnitude larger than the “Back-Drive Current Limit while
Enabled” specification*, then a fast back-drive limit controller will
increase the output voltage to maintain a constant output current.
If this results in the output voltage exceeding the “Output OverVoltage Protection” threshold*, then the unit will shut down. The
full I-V output characteristics can be seen in Figure 15.
1,000.0
100.0
10.0
1.0
0.1
0.0
0
5
10
15
20
25
% Increase in Vout
30
35
40
45
50
% Decrease in Vout
Figure B: Trim Graph for 28 Vout 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 filtered to eliminate noise.
Output Over-Voltage Limit: If the voltage directly across
the output pins exceeds the “Output Over-Voltage Protection”
threshold*, the converter will immediately stop switching. This
shutdown is latching; unlike other shutdown types, the converter
will not restart unless the input power is cycled or the ON/OFF
input is toggled.
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.
* See Electrical Characteristics page.
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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.
18-36 V
28 V
14 A (392 W)
Half-brick
Output Filtering and External Output Capacitance:
Figure D below shows the internal output filter components. This
filter dramatically reduces output voltage ripple. However, some
minimum external output capacitance is required, as specified in
the Output Characteristics section on the Electrical Specifications
page. No damage will occur without this capacitor connected,
but peak output voltage ripple will be much higher.
Application Circuits: Figure C below provides a typical circuit
diagram which details the input filtering and voltage trimming.
Input Filtering and External Input Capacitance: Figure D
below shows 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 Specifications page.
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
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 # IQ24280HEC14
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Doc.# 005-IHE2428 Rev. B
09/19/08
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Input:
Output:
Current:
Package:
Technical Specification
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
seven ways that the converter can be shut down, initiating a
Startup Inhibit Period:
• Input Under-Voltage Lockout
• Output Over-Voltage Protection
• Over Temperature Shutdown
• Current Limit
• Short Circuit Protection
• Turned off by the ON/OFF input
Figure F shows three turn-on scenarios, where a Startup
Inhibit Period is initiated at t0, t1, and t2:
18-36 V
28 V
14 A (392 W)
Half-brick
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.
Thermal Considerations: The maximum operating baseplate temperature, TB, is 100 ºC. As long as the user’s
thermal system keeps TB < 100 ºC, the converter can
deliver its full rated power.
A power derating curve can be calculated for any heatsink
that is attached to the base-plate of the converter. It is only
necessary to determine the thermal resistance, RTHBA, of the
chosen heatsink between the base-plate and the ambient air
for a given airflow rate. This information is usually available
from the heatsink vendor. The following formula can the be
used to determine the maximum power the converter can
dissipate for a given thermal condition if its base-plate is to
be no higher than 100 ºC.
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.
This value of power dissipation can then be used in
conjunction with the data shown in Figure 2 to determine
the maximum load current (and power) that the converter
can deliver in the given thermal condition.
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.
For convenience, Figures 3 and 4 provide Power derating
curves for an encased converter without a heatsink and
with a typical heatsink.
max
Pdiss =
100 ºC - TA
RTHBA
Vin
Under-Voltage
Lockout TurnOn Threshold
ON/OFF
(neg logic)
ON
OFF ON
Vout
OFF
ON
9ms (typical
turn on time)
200ms
(typical start-up
inhibit period)
t0
200ms
200ms
t1
t
t2
Figure F: Startup Inhibit Period (turn-on time not to scale)
Product # IQ24280HEC14
Phone 1-888-567-9596
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Doc.# 005-IHE2428 Rev. B
09/19/08
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Input:
Output:
Current:
Package:
Technical Specification
18-36 V
28 V
14 A (392 W)
Half-brick
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 3 characters for options.
A “-G” suffix indicates the product is 6/6 RoHS compliant.
I Q 24
28 0 H E C
14 N N S - G
6/6 RoHS
Options (see
Ordering Information)
Output Current
Thermal Design
Performance Level
Package Size
Model Number
Input
Voltage
Output
Voltage
Max Output
Current
IQ24280HEC14xyz
18 - 36 V
28 V
14 A
IQ24500HEC08xyz
18 - 36 V
50 V
8A
Output Voltage
Input Voltage
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.
The following options must be included in place of the x y z
spaces in the model numbers listed above.
Options Description: x y z
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
R - 0.180"
S - Standard
Not all combinations make valid part numbers, please contact
SynQor for availability.
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 # IQ24280HEC14
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-IHE2428 Rev. B
09/19/08
Page 12
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