75 Watt HD Dual Series DC/DC Converters
Features
Small size 2.4" x 2.28" x 0.53"
Excellent thermal performance with metal baseplate
Volt-seconds clamp
Non-latching over voltage shutdown
Pulse-by-pulse current limiting,
short circuit frequency foldback
Over-temperature protection
Auto-softstart
Low noise
Constant frequency for normal operation.
2:1 input voltage range
Positive logic primary remote ON/OFF
Description Negative logic primary shutdown as an option
The HD Dual Series DC/DC family provides two independent
Very low temperature coefficient
and precisely regulated low output voltage converters in one
package reducing cost and saving board space. The HD Water Washable
Series meets rigorous requirements in an industry standard ½
Trimmable output voltages
brick package, and is well suited for telecom and industrial
applications. Low cost
Both outputs are rated for a maximum of 10 Amps, thus 5 Year Warranty
providing many possible output load combinations with a total
output power of 75 Watts. The remote trim function on each
output can be used to compensate for voltage drops between Selection Chart
the converter and the load at higher currents. Input Range V out I out
Model * VD C VD C ADC
The HD Series includes a primary remote on/off for power
conservation. The HD package features threaded-through Min Max V1 V2 **
holes to allow for easy mounting or the addition of a heat sink 24D5.3R3HD 18 36 5 3.3 10
for extended temperature operation. 24D5.2R5HD 18 36 5 2.5 10
24D5.1R8HD 18 36 5 1.8 10
24D5.1R5HD 18 36 5 1.5 10
24D3.2R5HD 18 36 3.3 2.5 10
24D3.1R8HD 18 36 3.3 1.8 10
obsolet 24D3.1R5HD 18 36 3.3 1.5 10
48D5.3R3HD 36 75
A 5 3.3 10
48D5.2R5HD 36 75 5 2.5 10
48D5.1R8HD 36 75 5 1.8 10
48D5.1R5HD 36 75 5 1.5 10
48D3.2R5HD 36 75 3.3 2.5 10
48D3.1R8HD 36 75 3.3 1.8 10
48D3.1R5HD 36 75 3.3 1.5 10
*Add (-N) to the end of the part number for negative logic on the
primary shutdown. Default ON/OFF logic is positive.
** The output currents are the maximum ratings of each of the
outputs. It is up to the user to keep the total power output at or below
the 75 Watt rating of the package.
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
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75 Watt HD Dual Series DC/DC Converters
Unless otherwise stated, these specifications apply for ambient temperature TA=23 ±2°C, nominal input voltage, and full load. (1) (2)
Input Parameters
Model 24D5.3R3HD 24D5.2R5HD 24D5.1R8HD 24D5.1R5HD 24D3.2R5HD 24D3.1R8HD 24D3.1R5HD Units
MIN 18
Voltage Range TYP 24 VD C
MAX 36
Input Overvoltage
MAX 50 VD C
100 mSec
Input Ripple Rejection
TYP 50 dB
(120Hz)
Undervoltage Lockout Yes
Input Reverse Voltage Protection Yes
Input Current 100% Load TYP 3.6 A
Inrush Current MAX 0.5 A2 S
Reflected Ripple, 12µH
TYP 20 mA P-P
Source Impedance (4)
Efficiency TYP 81 80 %
Switching Frequency TYP 360 kHz
Recommended Fuse (3) AMPS
Input Parameters
Model 48D5.3R3HD 48D5.2R5HD 48D5.1R8HD 48D5.1R5HD 48D3.2R5HD 48D3.1R8HD 48D3.1R5HD Units
MIN 36
Voltage Range TYP 48 VD C
MAX 75
Input Overvoltage
MAX 85 VD C
100 mSec
Input Ripple Rejection
TYP 50 dB
(120Hz)
Undervoltage Lockout Yes
Input Reverse Voltage Protection Yes
Input Current No Load TYP 12 mA
100% Load TYP 1.8 A
Inrush Current MAX 0.5 A2 S
Reflected Ripple, 12µH
TYP 20 mA P-P
Source Impedance (4)
Efficiency TYP 82 78 %
Switching Frequency TYP 360 kHz
Recommended Fuse (3) AMPS
NOTES:
at less than minimum load, but the output voltage may contain
(1) Refer to the CALEX Application Notes for the definition of terms, a low frequency component that may exceed output noise
measurement circuits, and other information. specifications.
(2) Full Load is defined as the main output operating at 10 Amps. (7) Load Transient Recovery Time is defined as the time for the
The auxiliary output equally loaded to bring output power to 75 output to settle from a 50 to 75% or 25% step load change to a
Watts, or 10 Amps maximum on each. 1% error band of output voltage(rise time of step = 2µ Sec).
(3) This unit is not fused and needs to be fused by the user. Refer (8) Load Transient Overshoot is defined as the peak overshoot
to the CALEX Application Notes for information on fusing. For during a transient as defined in the Note 7 above.
inrush current, refer to the specifications above.
(9) Load regulation is defined as the output voltage change when
(4) A 33 uF capacitor should be connected to two "Input" pins. Then changing load current from maximum to minimum. The voltage
place the current sensor in series with 12 µH inductor between is measured at the output pin.
33 uF and the source. The reflected ripple current is measured
(10) Most switches would be suitable for logic On/Off control, in case
over a 5 Hz to 20 MHz bandwidth. Noise should be minimized in
there is a problem, you can make following estimations and then
the measurement.
leave some margin.
(5) Noise is measured per the CALEX Application Notes. Output
When open collector is used for logic high, "Open Circuit Voltage
noise is measured with a 10 µF tantalum capacitor in parallel
at On/Off Pin", "Output Resistance" and "External Leakage
with a 0.1 µF ceramic capacitor connected across the output to
Current Allowed for Logic High" are used to estimate the high
CMN. Measurement bandwidth is 0-20 MHz.
impedance requirement of open collector.
(6) Optimum performance is obtained when this power supply is
When switch is used for logic low, "Open Circuit Voltage at On/
operated within the minimum to maximum load specifications.
Off Pin", "Output Resistance" and "LOW Logic Level" are used
No damage to the module will occur when the output is operated
to estimate the low impedance requirement of switch.
2 CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
75 Watt HD Dual Series DC/DC Converters
Unless otherwise stated, these specifications apply for ambient temperature TA=23 ±2°C, nominal input voltage, and full load. (1) (2)
Output Parameters (V1)
24D5.3R3HD 48D5.2R5HD
24D3.2R5HD 48D3.2R5HD
24D5.2R5HD 48D5.3R3HD
Model 24D3.1R8HD 48D3.1R8HD Units
24D5.1R8HD 48D5.1R8HD
24D3.1R5HD 48D3.1R5HD
24D5.1R5HD 48D5.1R5HD
Output Voltage 5 3.3 VDC
Output Voltage
MAX ±1 %
Setpoint Accuracy
Turn On Overshoot TYP 0 %
TYP 0.003
Temperature Coefficient %/°C
MAX 0.01
TYP 50 33
Noise & Ripple (5) mV P-P
MAX 100 66
MIN 1.0
Load Current (6) (12) A
MAX 10.0
Load Transient Overshoot (8) TYP 4 %
Load Transient Recovery Time (7) TYP 100 µSec
Load Regulation (9) TYP 0.5
%
Min-Max Load MAX 1
Line Regulation TYP 0.1
%
Vin = Min-Max MAX 0.5
Overvoltage Protection (OVP)
Threshhold
TYP 130 %
OVP Type - Non-latching
Open Loop Overvoltage Clamp
Output Current Limit
TYP 120 %
V out=90% of V out-nom
Output Short Circuit Current
MAX 175 %
V out = 0.25 V
Output Parameters (V2)
24D5.2R5HD 24D5.1R8HD 24D5.1R5HD
24D5.3R3HD 24D3.2R5HD 24D3.1R8HD 24D3.1R5HD
Model Units
48D5.3R3HD 48D5.2R5HD 48D5.1R8HD 48D5.1R5HD
48D3.2R5HD 48D3.1R8HD 48D3.1R5HD
Output Voltage 3.3 2.5 1.8 1.5 VDC
Output Voltage
MAX ±1.5 %
Setpoint Accuracy
Turn On Overshoot TYP 0 %
TYP 0.02
Temperature Coefficient %/°C
MAX 0.05
Noise & Ripple (5)
TYP
MAX
33
66
25
50
18
36
A 15
30
mV P-P
MIN 0.2
Load Current (6) A
MAX 10.0
Load Transient Overshoot (8) TYP 4 %
Load Regulation (9) TYP 0.5
%
Min-Max Load MAX 1
Line Regulation TYP 0.5
%
Vin = Min-Max MAX 1
(11) Thermal impedance is tested with the converter mounted vertically (14) When an external On/Off switch is used, such as open collector
and facing another printed circuit board 1/2 inch away. If switch, logic high requires the switch to be high-impedance.
converter is mounted horizontally with no obstructions, thermal Switch leakage currents greater than 10 uA may be sufficient to
impedance is approximately 7 °C/W. trigger the ON/Off to the logic-low state.
(12) Minimum load is defined as 10% of maximum load. Calex Mfg.
Co. Inc. does not guarantee performance for loads less than the
minimum. Loads less than the minimum shall not damage the
unit.
(13) The unit can be configured with negative logic for Remote ON/
OFF.
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
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75 Watt HD Dual Series DC/DC Converters
General Specifications
All Models Units
Primary Remote ON/OFF Function
HIGH Logic Level
MAX 3.0 VDC
for ON
External Leakage Current
MAX 10 µA
Allowed for Logic High (14)
Input Diode Protection
MAX 50 VDC
Voltage
LOW Logic Level
TYP 1.0 VDC
or Tie ON/OFF Pin to -Input
Sinking Current for Primary
MAX 500 µA
Logic Level
Open Circuit Voltage at
Primary On/Off Pin (10)
Positive Logic TYP 2.3 VDC
Negative Logic TYP 1.5 VDC
Output Resistance (10) TYP 3 k Ohm
Idle Current
TYP 2 mADC
(Module is OFF)
Pin Function Pin Function
Turn-on Time to 1% error TYP 20 mSec
1 CASE 6 + V2
HIGH - Module ON
Remote ON/OFF Logic (13) 2 - INPUT 7 V2 TRIM
LOW - Module OFF
Output Voltage Trim 3 + INPUT 8 - V1
MIN % of 4 ON/OFF 9 V1 TRIM
Trim Range ±10
MAX Vout 5 - V2 10 + V1
Input Resistance TYP 10 k Ohm
Open Circuit Voltage TYP 2.5 V
Trim Limit
% of
Maximum Output Voltage MAX 110
Vout
Isolation
Input to Output Isolation
10µA Leakage
VDC
48 VDC MAX 1544
24 VDC MAX 700
Input to Output Resistance MIN 10 Mohm
Input to Output Capacitance TYP 1800 pF
Environmental
Calculated MTBF, Bellcore
>1,000,000 Hr
Method 1, Case 1
Baseplate Operating MIN -40
°C
Temperature Range MAX 100
MIN -40
Storage Temperature °C
MAX 120
Thermal Impedance (11) TYP 7 °C/W
General
Unit Weight TYP 4/114 oz/g
Case Dimension 2.4" x 2.28" x 0.55"
Agency Approvals UL60950 pending
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
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