1
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO# 131115-1, 150410-1
75 WATT QH SINGLE SERIES
DC/DC CONVERTERS
Features
Small size, 1.45” x 2.28” x 0.52”
industry standard 1/4 brick
Excellent thermal performance with metal baseplate
High Efciency
Fast over voltage protection
Pulse-by-pulse current limiting, dead short
current limiting
Over-temperature protection
Auto-softstart
Very Low noise
Low prole magnetics run cooler
Constant frequency for normal operation
More than 2:1 input voltage range
Remote Sense with high regulation
Remote ON/OFF
Super energy saving, 6 mA input idle current
Output trim with very low temperature coefcient
Water Washable, wide humidity application
Good shock and vibration damping
Low Cost
5 Year Warranty
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Selection Chart
Model
Input Range
VDC
Iin
ADC
Vout
VDC
Iout
ADC
Min Max TYP
24S3.20QH
18 36 3.31 3.3 20
24S5.15QH 18 36 3.63 5 15
24S12.6QH 18 36 3.59 12 6.25
24S15.5QH 18 36 3.55 15 5
24S24.3QH
18 36 3.55 24 3.13
48S24.3QH 36 75 1.76 24 3.13
The 75 Watt single QH series of DC/DC Converters
provide precisely regulated dc outputs. All outputs are
fully isolated from the inputs, allowing the output to
be used with positive or negative polarity and various
grounding options. The QH Series meets the most
rigorous requirements in an industry standard case size
for industrial process control and telecom applications.
Standard features include remote sensing, output trim,
and remote on/off. Threaded-through holes are provided
to allow easy mounting or add a heat sink for extended
temperature use.
Description
Default ON/OFF logic is positive.
Add -N to the model number to order negative On/Off logic.
2
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO# 131115-1, 150410-1
75 WATT QH SINGLE SERIES
DC/DC CONVERTERS
Input Parameters
Model 24S3.20QH 24S5.15QH 24S12.6QH 24S15.5QH 24S24.3QH Units
Voltage Range
MIN
TYP
MAX
18
24
36
VDC
Input Overvoltage (100 ms) MAX 50 VDC
Input Ripple Rejection (120Hz) TYP 60 dB
Undervoltage Lockout Yes
Input Reverse Voltage Protection Yes
Input Current No Load
100% Load
TYP
TYP
50
3.3
50
3.6
50
3.6
50
3.6
50
3.6
mA
A
Inrush Current MAX 0.2 A
2
s
Reected Ripple, 12µH
Source Impedance (3)
TYP 10 mA p-p
Efciency TYP 79 85 86 87 87 %
Switching Frequency TYP 360 kHz
Recommended Fuse (2) A
Input Parameters
Model 48S24.3QH Units
Voltage Range
MIN
TYP
MAX
36
48
75
VDC
Input Overvoltage (100 mSec) MAX 85 VDC
Input Ripple Rejection (120Hz) TYP 60 dB
Undervoltage Lockout Yes
Input Reverse Voltage Protection Yes
Input Current No Load
100% Load
TYP
TYP
80
1.8
mA
A
Inrush Current MAX 0.2 A
2
s
Reected Ripple, 12µH
Source Impedance (3)
TYP 10 mA p-p
Efciency TYP 87 %
Switching Frequency TYP 360 kHz
Recommended Fuse (2) A
Unless otherwise stated, these specications apply for baseplate temperature TB=23±2ºC, nominal input voltage, and rated full load. (1)
* Absolute Maximum Ratings. Caution: Stresses in excess of the Absolute Maximum Ratings can cause permanent damage to the device (see Note 1.)