A
25 to 45 Watt UW Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
1
eco# 041007-1
PI
INPUT
FILTER
1
2
8
5
4
3
7
6 + OUTPUT
CMN
+ SENSE
TRIM
- SENSE
+ INPUT
- INPUT
ON/OFF
VOLTAGE
FEED
FORWARD
PWM
SHIELDED COPPER CASE
THERMAL SHUTDOWN
C1
D1
C2
Features
Ultra Wide Input Voltage Range
Low Noise, Highly Regulated Single Outputs
No Derating to 80C Case Temperature
Six-Sided Shielded Low Thermal
Gradient Copper Case
Overvoltage Protected Output
Pulse by Pulse Digital Current Limiting Thermal
Overload Protection
Direct Paralleling of Outputs
5 Year Warranty
Description
These converters are state-of-the-art 100kHz Bipolar based
designs that provide outstanding efficiency of up to 91% at full
load. The output is regulated with a high loop gain feed
forward control method that provides linear regulator type
performance with a true, high efficiency switching DC/DC
topology. The large amount of loop gain insures excellent
input ripple rejection and line transient response.
Outstanding line and load regulation are achieved over the
full input voltage range and over the specified load current
range by the use of external voltage sensing circuitry. Also
included are a logic shutdown pin to control converter operation
and an output voltage trim pin.
The converters are protected from output shorts to common
by a high speed, pulse by pulse digital, current limit circuit and
a resettable thermal shutdown circuit. The output and the
power switch are overvoltage protected.
25 to 45 Watt UW Single Series Block Diagram
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1
A
25 to 45 Watt UW Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
2
eco# 041007-1
NOTES
*
All parameters measured at Tc = 25C, nominal input voltage
and full rated load unless otherwise noted. Refer to the
CALEX Application Notes for the definition of terms,
measurement circuits and other information.
(2)
Determine the correct fuse size by calculating the maximum DC
current drain at low line input, maximum load then adding 20 to
25 percent.
(3)
No minimum load required.
(4)
Short term stability is specified after a 30 minute warm-up at full
load and with constant line, load and ambient conditions.
(5)
The transient response is specified as the time required to settle
from 25 to 75% step load change (rise time of step = 2Sec.) to
a 1% error band.
(6)
Dynamic response is the peak overshoot voltage during the
transient response time defined in note 5 above.
(7)
The input ripple rejection is specified for DC to 120Hz ripple with
a modulation amplitude of 1% Vin.
(8)
For module protection only, see also note 2.
(9)
The user must not let the output at the pins exceed this voltage
due to the combined effects of line drops and output trim.
(10) The logic shutdown pin is Open Collector TTL, CMOS, and relay
compatible. The input to this pin is referenced to input minus and
is protected to +100 VDC.
(11) The functional temperature range is intended to give an additional
data point for use in evaluating this power supply. At the low
functional temperature the power supply will function with no
side effects, however, sustained operation at the high functional
temperature will reduce expected operational life. The data
sheet specifications are not guaranteed over the functional
temperature range.
(12) The case thermal impedance is specified as the case temperature
rise over ambient per package watt dissipated.
(13) Specifications subject to change without notice.
(14) 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 specific
manufacturing process. Converters are not hermetically sealed.
*
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A
25 to 45 Watt UW Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
3
eco# 041007-1
NOTE: Keep V1 < 0.3 volts for optimum regulation
LOAD
6
V1
3
5
V1
7
DC/DC
+ OUTPUT
+ SENSE
- SENSE
- OUPUT
TRIMPOT
FIXED RESISTOR
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4
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4
3
10K
TRIM UP
TRIM DOWN
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5
10
15
20
25
30
35
40
LINE INPUT (VOLTS)
76
77
78
79
80
81
82
83
84
EFFICIENCY (%)
12S5.5000UW EFFICIENCY Vs. LINE INPUT
50% FULL LOAD
100% FULL LOAD
0
20
40
60
80
100
LOAD (%)
65
70
75
80
85
EFFICIENCY (%)
12S5.5000UW EFFICIENCY Vs. LOAD
LINE = 7VDC
LINE = 12VDC
LINE = 40VDC
5
10
15
20
25
30
35
40
LINE INPUT (VOLTS)
0.0
1.0
2.0
3.0
4.0
5.0
INPUT CURRENT (AMPS)
12S5.5000UW INPUT CURRENT Vs. LINE INPUT VOLTAGE
50% FULL LOAD
100% FULL LOAD
Typical Performance (Tc=25C; Full Rated Load)
Mechanical tolerances unless otherwise noted:
X.XX dimensions: 0.020 inches
X.XXX dimensions: 0.005 inches
Seal around terminals is not hermetic. Do not immerse units in any
liquid.
Connections for Output Trim
BOTTOM VIEW
SIDE VIEW
A
25 to 45 Watt UW Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4
eco# 041007-1
Typical Performance (Tc=25C; Full Rated Load)
10
15
20
25
30
35
40
LINE INPUT (VOLTS)
86
88
90
92
EFFICIENCY (%)
24S12.2500UW EFFICIENCY Vs. LINE INPUT
50% FULL LOAD
100% FULL LOAD
0
20
40
60
80
100
LOAD (%)
50
55
60
65
70
75
80
85
EFFICIENCY (%)
24S12.2500UW EFFICIENCY Vs. LOAD
LINE = 14VDC
LINE = 24VDC
LINE = 40VDC
10
15
20
25
30
35
40
LINE INPUT (VOLTS)
0.0
1.0
2.0
3.0
4.0
INPUT CURRENT (AMPS)
24S12.3500UW INPUT CURRENT Vs. LINE INPUT VOLTAGE
50% FULL LOAD
100% FULL LOAD
15
20
25
30
35
40
LINE INPUT (VOLTS)
0.0
1.0
2.0
3.0
4.0
INPUT CURRENT (AMPS)
24S15.3000UW INPUT CURRENT Vs. LINE INPUT VOLTAGE
50% FULL LOAD
100% FULL LOAD
5
10
15
20
25
30
35
40
LINE INPUT (VOLTS)
10
15
20
25
CURRENT (mAMPS)
12S5.5000UW IDLE CURRENT Vs. LINE INPUT
15
20
25
30
35
40
LINE INPUT (VOLTS)
10
12
14
16
18
CURRENT (mAMPS)
24S15.3000UW IDLE CURRENT Vs. LINE INPUT
FREQUENCY (Hz)
-60
-50
-40
-30
-20
ATTENUATION (dB)
12S5.5000UW
LINE to OUTPUT TRANSFER FUNCTION Vs FREQUENCY
100
1K
10K
FREQUENCY (Hz)
-70
-60
-50
-40
-30
-20
ATTENUATION (dB)
24S12.2500UW
LINE TO OUTPUT TRANSFER FUNCTION
100
1K
10K
0
20
40
60
80
100
120
140
OUTPUT LOAD (%)
0
20
40
60
80
100
120
OUTPUT VOLTAGE (%)
OUTPUT VOLTAGE Vs. OUTPUT LOAD
-30
-20
-10
0
10
20
30
40
50
60
70
80
CASE TEMPERATURE (Deg C)
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
NORMALIZED OUTPUT (%)
OUTPUT VOLTAGE Vs. CASE TEMPERATURE
FREQUENCY (Hz)
.001
.01
.1
1
IMPEDANCE (OHMS)
OUTPUT IMPEDANCE Vs. FREQUENCY
5V OUTPUT
12V & 15V OUTPUT
10
100
1K
10K
100K
1M
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