1
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO# 121004-1, 130226-2, 160405-1
75 WATT HE TRIPLE SERIES
DC/DC CONVERTERS
Features
Small size 2.4” x 2.28” x 0.53” half-brick package
Excellent Thermal Performance with metal baseplate
High Efciency
Volt-seconds clamp and fast over voltage clamp
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
Negative logic primary shutdown as an option
Very low temperature coefcient
Water Washable
Trimmable output voltage
Low Cost
5 Year Warranty
Available in both RoHS and Non-RoHS construction.
See ordering info below model selection chart.
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Selection Chart
Model
Input Range
VDC
Iin
ADC Vout
VDC
Iout
ADC
Min Max TYP
24T5.12HE 18 36 3.63 5, ±12 15, ±2.0
24T5.15HE 18 36 3.60 5, ±15 15, ±2.0
48T5.12HE 36 75 1.80 5, ±12 15, ±2.0
48T5.15HE 36 75 1.79 5, ±15 15, ±2.0
48T5.17HE 36 75 1.78 5, ±17 15, ±2.0
The Standard Triple HE DC/DC converter provides three
regulated low voltage DC outputs at high efciency
and low cost. The unit has feedback from the +5 Vdc
output. The auxiliary outputs are cross regulated to the
main feedback loop (reference the block diagram). The
Standard Triple HE meets rigorous requirements in an
industry standard case size and is well suited for most
telecommunication applications.
The Standard Triple HE includes primary remote
on/off control plus threaded-through holes to allow
easy mounting or the addition of a heat sink for high
temperature use.
Description
The output currents are the maximum ratings of each of the outputs. It is up to the user to
ensure that the total power output is below 75 Watts.
Default ON/OFF logic is positive.
Add -N to the model number to order negative ON/OFF logic.
To order RoHS, add (RoHS) to part number.
75 Watt HE Triple Series Block Diagram
2
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO# 121004-1, 130226-2, 160405-1
75 WATT HE TRIPLE SERIES
DC/DC CONVERTERS
Input Parameters
Model 24T5.12HE 24T5.15HE Units
Voltage Range
MIN
TYP
MAX
18
24
36
V
Input Overvoltage (100 ms) MAX 50 V
Input Ripple Rejection (120Hz) TYP 50 dB
Undervoltage Lockout Yes
Input Reverse Voltage Protection Yes
Input Current No Load
Typ Load
TYP
TYP
15
3.67
mA
A
Inrush Current MAX 0.5 A2s
Reected Ripple, 12µH
Source Impedance (3) TYP 20 mA p-p
Efciency TYP 85 85 %
Switching Frequency TYP 325 kHz
Recommended Fuse (2) A
Input Parameters
Model 48T5.12HE 48T5.15HE 48T5.17HE Units
Voltage Range
MIN
TYP
MAX
36
48
75
V
Input Overvoltage (100 mSec) MAX 85 V
Input Ripple Rejection (120Hz) TYP 50 dB
Undervoltage Lockout Yes
Input Reverse Voltage Protection Yes
Input Current No Load
Typ Load
TYP
TYP
12
1.8
mA
A
Inrush Current MAX 0.5 A2s
Reected Ripple, 12µH
Source Impedance (3) TYP 20 mA p-p
Efciency TYP 88 89 %
Switching Frequency TYP 325 kHz
Recommended Fuse (2) A
Unless otherwise stated, these specications apply for baseplate temperature TB=23±2ºC, nominal input voltage, and rated typ load. (1)
Notes:
(1) Refer to the CALEX Application Notes for the denition of terms,
measurement circuits, and other information.
(2) These units are not fused and need to be fused by the user. Refer
to the CALEX Application Notes for information of fusing. For inrush
current, refer to the specications above.
(3) 33µF capacitor connected between the two “Input” pins. Then insert
current sensor in series with 12µH inductor between 33µF and the
source. The reected ripple current is measured over a 5 Hz to 20
MHz bandwidth. Noise should be minimized in the measurement.
(4) Noise is measured per the CALEX Application Notes. Output noise
is measured with a 10µH tantalum capacitor in parallel with a 0.1 µF
ceramic capacitor connected across the output to CMN. Measurement
bandwidth is 0-20MHz.
(5) Optimum performance is obtained when this power supply is operated
within the minimum to maximum load specications. No damage to
module will occur, when the output is operated at less than minimum
load, but the output voltage may contain a low frequency component
that may exceed output noise specications. Total output power must
not exceed 75W.
(6) Load Transient Recovery Time is dened as the time for the output
to settle from a 50% to 75% or 25% step load change to a 1% error
band (rise time of step = 2µs).
(7) Load Transient Overshoot is dened as the peak overshoot during a
transient as dened in the Note 6 above.
(8) Load regulation is dened as the output voltage change when
simultaneously changing all outputs from typ. to min load and noting
the change. The voltage is measured at the output pin.
(9) Cross regulation is dened as the change in one output (set at 70%
of maximum load) when only one of the other outputs is changed for
70% of maximum to 20% of maximum load.
(10) Most switches would be suitable for the logic ON/OFF control. In
case there is a problem you can make the following estimations and
then leave some margin.
When open collector is used for logic high, “Open Circuit Voltage at
ON/OFF Pin”, “Output Resistance” and “External Leakage Current
Allowed for Logic High” are used to estimate the high impedance
requirement of open collector.
When switch is used for logic low, “Open Circuit Voltage at ON/
OFF Pin”, “Output Resistance” and “LOW Logic Level” are used to
estimate the low impedance requirement of the switch.
Continued on page 4.
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2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO# 121004-1, 130226-2, 160405-1
75 WATT HE TRIPLE SERIES
DC/DC CONVERTERS
Output Parameters (VO1)
Model 24T5.12HE 48T5.12HE
24T5.15HE 48T5.15HE
48T5.17HE
Units
Output Voltage 5 V
Output Voltage Setpoint Accuracy
@ Typ Load MAX ±1 %
Turn On Overshoot Min-Max Load TYP 0 %
Temperature Coefcient TYP
MAX
0.003
0.01 %/ºC
Noise and Ripple RMS (4) TYP
TYP
100
50
mV p-p
mV rms
Load Current (5) (12) MIN
TYP
MAX
1.5
10
15
A
Load Transient Overshoot (7) TYP 4 %
Load Transient Recovery Time (6) TYP 200 µs
Load Regulation (5)
Min-Typ Load
TYP
MAX
1
1.2 %
Line Regulation
Vin = Min-Max
TYP
MAX
0.01
0.1 %
Overvoltage Protection (OVP) Threshhold
OVP Type - Non-latching
Open Loop Overvoltage Clamp
TYP 130 %
Output Current Limit
Vout = 90% of Vout-nom TYP 120 %
Output Short Circuit Current
Vout = 0.25V MAX 175 %
Unless otherwise stated, these specications apply for baseplate temperature TB=23±2ºC, nominal input voltage, and rated typ load. (1)
Output Parameters (VO2, VO3)
Model 24T5.12HE 48T5.12HE 24T5.15HE 48T5.15HE 48T5.17HE Units
Output Voltage ±12 ±15 ±17 V
Output Voltage Setpoint Accuracy
@ Typ Load MAX ±5.5 %
Turn On Overshoot Min-Max Load TYP 0 %
Temperature Coefcient TYP
MAX
0.02
0.05 %/ºC
Noise and Ripple RMS (4) TYP
TYP
150
100
150
100
200
150
200
150
200
150
mV p-p
mV rms
Load Current (5) (12)
MIN
TYP
MAX
0.2
1.041
2.0
0.2
0.833
2.0
0.2
0.735
2.0
A
Load Transient Overshoot (7) TYP 4 %
Load Regulation (5)
Min-Typ Load
TYP
MAX
3.5
5%
Line Regulation
Vin = Min-Max
TYP
MAX
0.5
1%
Cross Regulation (9) TYP 4 %
Absolute Regulation TYP 8 %
Output Voltage Protection
Open Loop Overvoltage Clamp Yes (Volt-Seconds Clamp) %
4
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO# 121004-1, 130226-2, 160405-1
75 WATT HE TRIPLE SERIES
DC/DC CONVERTERS
General Specications
All Models Units
Primary Remote ON/OFF Function
HIGH Logic Level for ON MIN 3.0 VDC
External Leakage Current
Allowed for Logic High (14) MAX 10 µA
Input Diode Protection
Voltage MAX 50 VDC
LOW Logic Level or Tie
ON/OFF Pin to -INPUT MAX 1.0 VDC
Sinking Current for Primary
Logic Level MAX 500 µA
Open Circuit Voltage at
ON/OFF Pin (10)
Positive Logic
Negative Logic
TYP
TYP
2.3
1.5
VDC
VDC
Output Resistance (10) TYP 3 k Ω
Idle Current
(Module is OFF) TYP 2 mADC
Turn-on Time to 1% error TYP 20 ms
Remote ON/OFF Logic (13) HIGH - Module ON
LOW - Module OFF
Output Voltage Trim
Trim Range MIN
MAX ±10 % of Vout
Input Resistance TYP 10 kΩ
Open Circuit Voltage TYP 2.5 V
Trim Limit
Maximum Output Voltage MAX 110 % of Vout
Isolation
Input to Output Isolation
10µA Leakage
Vnom = 24V
Vnom = 48V
MIN
MIN
700
1544
VDC
VDC
Input to Output Resistance MIN 10 MΩ
Input to Output Capacitance TYP 1800 pF
Environmental
Calculated MTBF, Bellcore
Method 1, Case 1 >1,000,000 h
Baseplate Operating
Temperature Range
MIN
MAX
-40
100 ºC
Storage Temperature MIN
MAX
-40
120 ºC
Thermal Impedance (11) TYP 7 ºC/W
Thermal Shutdown
Baseplate
Temperature (Auto Restart)
TYP 110 ºC
General
Unit Weight TYP 4.6/114 oz/g
Case Dimension 2.4” x 2.28” x 0.53”
Torque on Mounting Inserts MAX 12 in. oz.
Agency Approvals Designed to Meet UL60950
Chassis Mounting Kit MS25
Pin Function Pin Function
1Primary ON/OFF 7 TRIM
2 -V IN 8 + V1
3 + VIN 9 - V1
4 CASE 10 N/U
5 - V2 11 + V3
6 + V2 12 - V3
TOLERANCE: ALL DIMENSIONS ARE TYPICAL IN
INCHES UNLESS OTHERWISE NOTED:
X.XX ±0.020
X.XXX ±0.005
(11) Thermal impedance is tested with the converter mounted
vertically and facing another printed circuit board 1/2 inch away.
If converter is mounted horizontally with no obstruction, thermal
impedance is approximately 7°C/W.
(12) Minimum load is dened 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 congured with negative logic for Remote ON/
OFF.
(14) When an external On/Off switch is used, such as open collector
switch, logic high requires the switch to be high-impedance.
Switch leakage currents greater than 10µA may be sufcient to
trigger the ON/OFF to the logic-low state.
(15) When using the trim function, the user should remember that all
three voltages will go up or down at the same time.
(16) Water Washability - Calex DC/DC converters are designed
to withstand most solder/wash processes. Careful attention
should be used when assessing the applicability in your specic
manufacturing process. Converters are not hermetically sealed.
(17) Torque fasteners into threaded mounting inserts at 12 in. oz. or
less. Greater torque may result in damage to unit and void the
warranty.
(18) RoHS Compliance:
See Calex Website www.calex.com/RoHS.html for the complete
RoHS Compliance statement.
The RoHS marking is as follows.