=24Vdc 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.
Min.
Typ.
Max.
50
40
50
2250
100
125
18
24
17.0
15.5
1.5
300
100
1.5
10
500
0.34\23
470
27.22
28.00
+0.25\70
+0.25\70
+0.215
27.15
150
40
0
19.5
4
0
21.0
11.5
5
3
36
17.5
16.0
2.0
38
400
125
25
40
Units
V
V
V
V
°C
°C
V
V
V
V
V
A
mA
mA
V
mA
mA
A
µH\µF
µF
V
%\mV
%\mV
V
V
mV
mV
A
A
V
A
mA
mF
V
V
ms
Notes & Conditions
Continuous
Continuous
100 ms transient, square wave
Basic insulation, Pollution Degree 2
-40
-55
-2
18
16.5
15.0
1.0
50 V transient for 100 ms
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
Typical ESR 0.1-0.2
W
28.75
+0.560
28.82
250
70
18
22.5
6
4
5
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
18 A Resistive Load
50% to 75% to 50% Iout max, 200 µF load cap
“
To within 1% Vout nom
Full load, ON/OFF to Vout=90% nom.
No load, 5 mF load cap
1.5
1.5
8
24
37
93
95
125
125
125
2250
30
1000
40
5
ms
%
%
%
°C
°C
°C
V
MW
pF
Package rated to 150°C
UL rated max operating temp 130°C
Note
Note
Note
Note
1:
2:
3:
4:
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: support@synqor.com).
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 # IQ24280HZx18
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-IHZ2428 Rev. G
12/04/09
Page 2
Technical Specification
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
Input:
Output:
Current:
Package:
18-36 V
28 V
18 A
(504 W)
Half-brick
Min.
232
116.0
4.0
-2
4.75
-50
125
Typ.
235
117.5
Max.
243
118.5
18
1.0
Units
kHz
kHz
V
V
V
V
kW
%
%
°C
°C
10
6
Hrs.
10
6
Hrs.
10
6
Hrs.
Notes & Conditions
Over sample, temp & life
Over sample, temp & life
1.5
5.00
10
130
120
10
1.49
1.31
5.25
+20
135
Measured across Pins 9 & 5; see trim section
Over full temp range; % of nominal Vout
Average PCB Temperature
Tb = 70ºC
Tb = 70ºC
See website for details
Product # IQ24280HZx18
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-IHZ2428 Rev. G
12/04/09
Page 3
Technical Specification
100
95
70
60
Input:
Output:
Current:
Package:
18-36 V
28 V
18 A
(504 W)
Half-brick
Efficiency (%)
85
80
75
70
65
60
0
2
4
6
8
10
12
14
16
18
18 Vin
24 Vin
36 Vin
Power Dissipation (W)
90
50
40
30
20
10
0
0
2
4
6
8
10
12
14
16
18
18 Vin
24 Vin
36 Vin
Load Current (A)
Load Current (A)
Figure 1:
Efficiency at nominal output voltage vs. load current for
minimum, nominal, and maximum input voltage at 25°C.
Figure 2:
Power dissipation at nominal output voltage vs. load current
for minimum, nominal, and maximum input voltage at 25°C.
16
14
12
10
20
18
16
14
Iout (A)
Iout (A)
12
10
8
6
4
2
0
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
25
40
55
70
85
8
6
4
2
0
25
40
55
70
85
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
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)
Product # IQ24280HZx18
Phone 1-888-567-9596
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)
Doc.# 005-IHZ2428 Rev. G
12/04/09
Page 4
www.synqor.com
Technical Specification
Input:
Output:
Current:
Package:
18-36 V
28 V
18 A
(504 W)
Half-brick
Figure 7:
Output voltage response to step-change in load current (50%-75%-50% of
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