®
®
PRELIMINARY
INNOVATION and EXCELLENCE
Triple Output
TWR Models
xDSL Line Card
30 Watt, DC/DC Converters
Features
I
Independently regulated 3.3V and
±12V or ±15V outputs
3.3V @ 4.25A and ±12V @ ±625mA
or ±15V @ ±500mA
30 Watts output power
87% efficiency; 75mV ripple/noise
Input ranges: 18-36V or 36-75V
2" x 2" plastic package
UL 1950 and EN60950 safety approvals
Fully isolated, 1500Vdc guaranteed
Basic Insulation transformer construction
Input under and overvoltage shutdown
Independent OVP; Short circuit protection
Thermal shutdown
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This family of triple output DC/DC converters was developed for xDSL line card
applications. Two independently regulated converters in a 2" x 2" x 0.5" plastic
package offer 3.3V @ 4.25A and ± 12V @ ±625mA or ± 15V @ ±500mA. Unlike
topologies that provide auxiliary bipolar secondary voltages, the TWR-3.3/4250-
12/625 and TWR-3.3/4250-15/500 have fully regulated bipolar control loops that
offer the same ±1% load regulation seen on the 3.3V primary output.
Available with input ranges of 18 to 36V (-D24), or 36 to 75V (-D48), this TWR
series offers 87% efficiency, ±1% line regulation, input overvoltage and undervoltage
shutdown circuitry, output overvoltage and short circuit protection, as well as current
limiting protection and thermal shutdown. The standard on/off control function can
be substituted with a sync option for multiple converter applications.
TWR triple output converters will deliver full output power in ambient,
still air environments ranging from –40 to +65°C. Designed using Basic Insula-
tion transformer construction, this family of converters guarantees 1500Vdc of
isolation voltage and meets IEC950, UL1950 and EN6950 safety standards.
"D48" models are CE marked (meet LVD requirements); CB reports are avail-
able upon request.
+V
IN
+3.3V OUTPUT
SWITCH
CONTROL
–V
IN
OUTPUT
RETURN
INPUT
UNDERVOLTAGE
AND OVERVOLTAGE
COMPARATORS
ON/OFF
CONTROL
OR OPTIONAL
SYNC
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
+12/15V OUTPUT
–12/15V OUTPUT
Figure 1. Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
XWR Series
Performance Specifications and Ordering Guide
V
OUT
(Volts)
+3.3
±12
+3.3
±12
+3.3
±15
+3.3
±15
3 0 W, T R I P L E O U T P U T D C / D C C O N V E RT E R S
➀
Input
Regulation (Max.)
Line
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
Model
TWR-3.3/4250-12/625-D24
TWR-3.3/4250-12/625-D48
TWR-3.3/4250-15/500-D24
TWR-3.3/4250-15/500-D48
I
OUT
➁
(mA)
4250
±625
4250
±625
4250
±500
4250
±500
Output
R/N (mVp-p)
➂
Typ.
75
100
75
100
75
100
75
100
Max.
125
150
125
150
125
150
125
150
Load
➃
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
V
IN
Nom.
(Volts)
24
48
24
48
Range
(Volts)
18-36
36-75
18-36
36-75
I
IN
➄
(mA)
100/1410
50/700
100/1410
50/700
Efficiency
Min.
84%
85%
84%
85%
Typ.
86%
87%
86%
87%
Package
(Case,
Pinout)
C22, P31
C22, P31
C22, P31
C22, P31
➀
Typical at T
A
= +25°C under nominal line voltage and maximum ouput currents.
➁
Any combination of +3.3V and ±12V/±15V rated output current, not to exceed the
published I
OUT
specification (30 Watts).
➂
Ripple/Noise (R/N) measured over a 20MHz bandwidth, specified with 0.2µF ceramic output capacitors.
➃
Tested from 10% load to 100% load, other outputs at maximum load.
➄
Nominal line voltage, no-load/full-load conditions.
PA R T N U M B E R S T R U C T U R E
M E C H A N I C A L S P E C I F I C AT I O N S
T WR
-
3.3
/
4250
-
12
/
625
-
D48 S
Output
Configuration:
T
= Triple
Wide Range Input
Nominal Primary Output
Voltage (+3.3 Volts)
Maximum Primary Output
Current in mA
Add "S" suffix
as desired
Input Voltage Range:
D24
= 18-36 Volts
(24V nominal)
D48
= 36-75 Volts
(48V nominal)
Maximum Auxiliary Output
Current in mA from each output
0.50
(12.70)
STANDOFF
0.020 (0.51)
2.00
(50.08)
PLASTIC CASE
0.040 ±0.001 DIA.
(1.016 ±0.025)
0.20 MIN
(5.08)
1.800
(45.72)
0.10
(2.54)
Nominal Auxiliary Output
Voltages (±12 or ±15 Volts)
0.200
(5.08)
5
Part Number Suffixes
The On/Off Control (pin 4) provided is designed for positive logic.
This pin can also be replaced with a Sync function by adding the
"S" suffix to the model number.
No Suffix
Positive polarity On/Off Control
S Suffix
Sync function replaces On/Off Control
0.100
(2.54)
1
2
0.400
(10.16)
Case C22
6
7
4
8
1.200
(30.48)
3 EQ. SP. @
0.400 (10.16)
2.00
(50.08)
0.40
(10.16)
BOTTOM VIEW
TEMPERATURE DERATING
30
28
26
24
22
D48 MODELS
I/O Connections
Pin
1
2
3
4
5
6
7
8
Function P31
+Input
–Input
No Pin
On/Off Control
+12V/15V Output
+3.3V Output
Common
–12V/15V Output
Output Power (Watts)
20
18
16
14
12
10
8
6
4
2
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
D24 MODELS
Ambient Temperature (
°
C)
2
3 0 W, T R I P L E O U T P U T D C / D C C O N V E RT E R S
TWR Models
Output (continued)
Short Circuit Current:
3.3V Output
±12V/±15V Output
Overvoltage Protection:
➁
3.3V Output
±12V Output
±15V Output
Maximum Capacitive Loading:
3.3V Models
5V Models
2.5 Amps average, continuous
2.0 Amps average, continuous
Magnetic feedback, transorb
4.2Vdc
30Vdc (±15V differential)
36Vdc (±18V differential)
1000µF
680µF
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, full-load conditions, unless noted.
➀
Input
Input Voltage Range:
D24 Models
D48 Models
Overvoltage Shutdown:
D24 Models
D48 Models
Start-Up Threshold:
➁
D24 Models
D48 Models
Undervoltage Shutdown:
➁
D24 Models
D48 Models
Input Current:
Normal Operating Conditions
Standby Mode:
Off, OV, UV, Thermal Shutdown
Input Reflected Ripple Current:
Source Impedance:
D24 Models
D48 Models
Internal Input Filter Type
Reverse-Polarity Protection:
➁
D24 Models
D48 Models
On/Off Control
(Pin 4)
➁ ➂ ➃ ➅
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
37-40 Volts (38V nominal)
77-81 Volts (79V nominal)
16-18 Volts (17V nominal)
34-36 Volts (35V nominal)
16-17 Volts (16.5V nominal)
32.5-35.5 Volts (34.5V nominal)
See Ordering Guide
10mA
Dynamic Characteristics
Dynamic Load Response:
300µsec maximum
3.3V (50-100% step to 2%V
OUT
)
±12V/±15V (50-100% step to 2%V
OUT
) 300µsec maximum
Start-Up Time:
➁
V
IN
to V
OUT
:
3.3V
±12V/±15V
On/Off to V
OUT
Switching Frequency
10msec
15msec
TBD
350kHz (±25kHz)
200mAp-p max., 140mAp-p (typ.)
200mAp-p max., 140mAp-p (typ.)
Pi (0.039µF - 2.2µH - 3µF)
1 minute duration, 4A maximum
1 minute duration, 2A maximum
On = open or 13V to +V
IN
,
I
IN
= 50µA @ 13V
Off = 0-0.8V, I
IN
= 1mA @ 0V
1-2.7 Volts
0-0.9 Volts
2.8-5 Volts
35kΩ minimum
3.5-4.8 Volts
35mA
160-360nsec
Environmental
MTBF:
➆
D24 Models
D48 Models
Operating Temperature
(Ambient):
➁
Without Derating:
D24 Models
D48 Models
With Derating
Case Temperature:
Maximum Operational
For Thermal Shutdown
Storage Temperature
Dimensions
Case Material
Pin Material
Weight:
TBC
TBC
–40 to +60°C
–40 to +65°C
To +100°C (See Derating Curves)
+100°C
+110°C minimum, +118°C maximum
–40 to +120°C
Sync
(Option, Pin 3):
➂ ➃ ➅
Input Threshold (Rising Edge Active)
Input Voltage Low
Input Voltage High
Input Resistance
Output High Voltage (100µA load)
Output Drive Current
Input/Output Pulse Width
Physical
2" x 2" x 0.5" (50.8 x 50.8 x 12.7mm)
Diallyl phthalate, UL94V-0 rated
Brass, solder coated
TBD
Output
V
OUT
Accuracy:
3.3V Output
±12V/±15V Output
Ripple/Noise
(20MHz BW)
➄
Line/Load Regulation
Efficiency
Minimum Loading Per Specification:
+3.3V Output
±12V/±15V Output
Minimum Loading For Stability
➇
Isolation Voltage:
Input-to-Output
Input-to-Case
Ouput-to-Case
Isolation Capacitance
Isolation Resistance
±1.5%
±2%
See Ordering Guide
See Ordering Guide
See Ordering Guide
10% of I
OUT
maximum
±30mA
No load
1500Vdc minimum
Plastic case
Plastic case
470pF
100MΩ
Primary to Secondary Insulation Level
Basic
➀
All models are specified with external 0.2µF ceramic output capacitors.
➁
See Technical Notes/Graphs for details.
➂
The On/Off control function can be replaced with a Sync function. See Part
Number Suffixes and Technical Notes for details.
➃
Applying a voltage to On/Off Control (pin 4) when no input power is applied to the converter
can cause permanent damage.
➄
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
➅
On/Off control is designed to be driven with open collector or by appropriate voltage
levels. Voltages must be referenced to the input return pin (–Input).
➆
Demonstrated MTBF available on request.
➇
For conditions with less than minimum loading, outputs remain stable. However, regulation
performance will degrade
Current Limit Inception:
3.3V @ 97%V
OUT
(±12/±15V @ I
OUT
max.) 5.0-6.5 Amps
0.825-1.35 Amps
±12V @ 97%V
OUT
(+3.3V @ I
OUT
max.)
±15V @ 97%V
OUT
(+3.3V @ I
OUT
max.)
0.625-1.15 Amps
Temperature Coefficient
±0.02% per °C
3
XWR Series
3 0 W, D UA L O U T P U T, M I X E D - VO LTAG E D C / D C C O N V E R T E R S
Absolute Maximum Ratings
Input Voltage:
Continuous:
D24A Models
D48A Models
Transient (100msec): D24A Models
D48A Models
42 Volts
81 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
4 Amps
2 Amps
Current limited. Devices can withstand
an indefinite output short circuit.
Model Number
TWR-3.3/4250-12/625-D24
TWR-3.3/4250-12/625-D48
TWR-3.3/4250-15/500-D24
TWR-3.3/4250-15/500-D48
Fuse Value
4 Amps
2 Amps
4 Amps
2 Amps
Input Reverse-Polarity Protection
➁
D24A Models
D48A Models
Output Current
➁
Start-Up Threshold and Undervoltage Shutdown
Under normal start-up conditions, TWR 30W triples will not begin to regulate
until the ramping input voltage exceeds the Start-Up Threshold Voltage (typi-
cally 17V for "D24" models and 35V for "D48" models). Once operating,
devices will not turn off until the input voltage drops below the Undervoltage
Shutdown/Lockout limit (typically 16.5V for "D24" models and 34.5V for "D48"
models). Subsequent re-start will not occur until the input is brought back
up to the Start-Up Threshold. This built-in hysteresis obviously avoids any
indeterminate on/off conditions at a single voltage.
Start-Up Time
On/Off Control (Pins 3 & 4) Max. Voltages
Referenced to –Input (pin 2)
No Suffix
+V
IN
"S" Suffix
+5.7 Volts
Storage Temperature
Lead Temperature
(Soldering, 10 sec.)
–40 to +120°C
+300°C
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied, nor recommended.
TECHNICAL NOTES
For all models in the TWR 30W Series, V
IN
to V
OUT
Start-Up Time is the
interval between the time at which a rapidly ramping input voltage crosses the
turn-on threshold point and the fully loaded output voltages enter and remain
within their specified accuracy bands. Actual measured times will vary with
output capacitance and load.
The On/Off to V
OUT
Start-Up Time assumes the converter is turned off via
the On/Off Control with the nominal input voltage already applied to the
converter. The specification defines the interval between the time at which the
converter is turned on and the fully loaded output voltages enter and remain
within their specified accuracy bands.
On/Off Control
The On/Off Control pin (pin 4) is provided for remote on/off operation.
TWR 30W Series converters are designed so that they are enabled when the
control pin is pulled high or left open (normal mode) and disabled when the
control pin is pulled low (to less than +0.8V relative to –Input, pin 2).
Dynamic control of the on/off function is best accomplished with a mechani-
cal relay or an open-collector/open-drain drive circuit (optically isolated if
appropriate). The drive circuit should be able to sink appropriate current (see
Performance/Functional Specifications) when activated..
Applying an external voltage to pin 4 when no input power is applied to the
converter can cause permanent damage to the converter. The on/off control
function, however, is designed such that the converter can be disabled (pin
4 pulled low) while input power is ramping up and then "released" once
the input has stabilized. The time duration between the point at which the
converter is released and its fully loaded output voltage settles to within
specified accuracy can be found in the Performance/Functional Specifications.
I/O Filtering and Noise Reduction
All models in the TWR 30W Series achieve their rated ripple and noise
specifications without the use of external input/output capacitors. In critical
applications, input/output ripple/noise may be further reduced by installing
additional external I/O caps. Input capacitors, which function primarily as
energy-storage elements, should be selected for bulk capacitance, low ESR
and high rms-ripple-current ratings. Output capacitors, which function more
as true filter elements, should be selected for bulk capacitance, low ESR,
and appropriate frequency response. All caps should have appropriate volt-
age ratings and be mounted as close to the converters as possible. Tem-
perature variations for all parameters should obviously be taken into consid-
eration.
The most effective combination of external I/O capacitors will be a function
of line voltage and source impedance, as well as. load and layout conditions.
Our Applications Engineers will be happy to recommend potential solutions
and can discuss the possibility of our modifying a given device’s internal
filtering to meet your specific requirements. Contact DATEL for further infor-
mation.
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of sustained, non-current-limited, input-voltage polarity
reversals exists. For DATEL TWR 30W DC/DC Converters, you should use
slow-blow type fuses with values no greater than the following.
®
®
INNOVATION and EXCELLENCE
ISO 9001 REGISTERED
DS-0486
12/00
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
Internet: www.datel.com
Email: sales@datel.com
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
DATEL GmbH München, Germany Tel: 89-544334-0
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do
not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
4
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