Product Specification
TXS Series: 75…120 A DC-DC Converters
36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W
Features
•
High density design in an industry standard
¾ brick size (2.4” x 3.45” x 0.5”)
•
Highly efficient topology with synchronous
rectifiers (η up to 92 %)
•
Unique mechanical and thermal design
•
Very high reliability achieved through
generous design safety margins
•
Tightly regulated output voltage, very low
output ripple, excellent dynamic performance
•
Monotonic start up
•
Provides basic insulation. I/O electric strength
test voltage 1500 V DC
•
Output voltage trim range
±
10 %
•
Remote sense, Primary remote ON/OFF
•
Overload, over temperature protection
•
Approvals
c
UL
us
, TÜV, CE for LVD
Applications
•
•
•
•
Latest generation of broadband telecom
and datacom equipment
High end computers
Fibre optic network equipment
Gate array and RAM bank applications
Options / Accessories
•
•
•
•
•
Negative ON/OFF logic
Long pins
Wide trim range -30 %, +10 %
Horizontal heat sink
Vertical heat sink
Description
The TXS is a series of 75 to 120 A, open frame, highly efficient, board mountable DC-DC converters with a
unique patented thermal and mechanical design. These low voltage – high amperage converters supply the
next generation of microprocessors, gate arrays and integrated circuits with reliable power. The TXS series
features input under voltage lockout, overload and over temperature protection and fulfills all requirements
for a perfect fit into Distributed Power Architectures (DPAs).
Table of contents
Data section, tables
-
Selection chart, absolute max ratings
-
Approvals, safety, fusing
-
Electrical specification
-
EMC, reliability, environmental spec.
-
List of available application notes
Characteristic curves
-
Efficiency and power loss
-
Static and dynamic regulation
-
Turn on, turn off
-
Input and output ripple
-
Inrush current and MTBF figures
Description of functions
-
Trim function
-
Remote sense
-
Loss and efficiency measurements
REV. FEB 18, 2003
2
3
3-5
5-6
6
7-8
9
10
11
12
13-14
14-15
15
-
Output over voltage protection
-
Connection in parallel or in series
-
Output over current protection
-
Low input voltage
-
Over temperature protection
Implementation
-
Safety considerations
-
EMC specification
-
Stability, input impedance
-
On board input and output filters
-
Thermal considerations
-
Reliability
-
Layout considerations
-
Screw fixing
-
Mechanical drawings
-
Ordering information
15
15
16
16
17
18-19
20-22
22
22
23-25
25
26
26
27
27
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Product Specification
TXS Series: 75…120 A DC-DC Converters
36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W
Selection Chart
Model
Input voltage
range
[V]
Output
voltage
[V]
Output rated
current,
[A]
Rated power
[W]
Required airflow
[LFM]
1/2
TXS75ZY
TXS75ZA
TXS75
Z
B
TXS80ZC
TXS80ZD
TXS100ZY
TXS100ZA
TXS100ZB
TXS100ZC
TXS100ZD
TXS120ZY
TXS120ZA
TXS120ZB
1
2
36-75
1.2
1.5
1.8
2.0
2.5
1.2
1.5
1.8
2.0
2.5
1.2
1.5
1.8
75
80
100
120
90
112
135
160
200
120
150
180
200
250
144
180
216
110
160
210
250
300
250
290
350
380
500
3
400
3
450
3
500
LFM = Linear Feet per Minute (200 LFM
≈
1 m/s)
Conditions:
T
A
= 60 °C,
T
Base plate
= 100 °C,
U
i nom
±25
%,
linear airflow, stand alone module.
See pages 23 to 25 and calculation tool on TXS product CD ROM.
3
Preliminary data
Options / Accessories
Options / Accessories
Negative Logic
Unit enabled when control signal is low
Long Pin, Lengths: 0.24’’ (6.1 mm)
Wide Trim Range: 70 to 110 %
U
o nom
Horizontal Heat sink
(Includes thermal pad)
Vertical Heat sink
(Includes thermal pad)
0.24"
0.45"
0.95"
0.24"
0.45"
0.95"
(6.1 mm)
(11.4 mm)
(24.1 mm)
(6.1 mm
(11.4 mm)
(24.1 mm)
Suffix
N
P2
R
1H
2H
3H
1V
2V
3V
Remarks
see Control Specifications table 3
Standard pin length: 0.18” (4.6 mm)
Standard trim range: 90 to 110 %
U
o nom
(see pages 13/14)
To extend operating thermal range
Fins on horizontal heat sinks run from the
input pins toward the output pins. Fins on
vertical heat sinks 90 ° to this.
Absolute Maximum Ratings
Stress in excess of the absolute maximum ratings may cause performance degradation, adversely affect
long term reliability or cause permanent damage to the converter.
Parameter
Maximum Input voltage (U
i
)
Operating Base Plate Temperature (T
BP
)
Storage Temperature (T
S
)
I/O Electric Strength Test Voltage
ON/OFF Control Voltage (U
SD
)
Maximum Output Voltage (U
o
)
Conditions/Description
Continuous
Transient, 100 ms
Full load
Non operational
One minute max.
TTL compatible, referenced to V
i
(-)
Adjusted by trim and/or sense
Min
36
-40
-55
-1.0
Max
75
100
100
115
1500
5.5
120
Units
V DC
V DC
°C
°C
V DC
V DC
%
U
o nom
REV. FEB 18, 2003
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Product Specification
TXS Series: 75…120 A DC-DC Converters
36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W
Safety Specification and Approvals
Approvals
Parameter
UL/TÜV Approvals
Conditions/Description
EN 60950:2000, UL 60950
CSA 22.2 No. 60950-00
Value
UL file N E132494
o
Safety
Parameter
Isolation
Electric Strength Test Voltage
Insulation Resistance
I/O Capacitance
1
2
Conditions/Description
I/Case, I/O
O/Case
I/Case, I/O
O/Case
T
A
= 25 °C
T
A
= 25 °C
Value
Basic
1
Functional
1500 V DC
500 V DC
typ. 50 MΩ
typ. 1.6 nF
1
EN 60950:2000/UL 60950
2
100 % factory test, one second
Fusing Considerations:
This power module is not internally fused. To meet safety requirements, an input line fuse should always be
used! Select a fuse according the specified input current in Table 1. The fuse rating should be selected in the
range [1.3·I
i max
..10 A]. The UL file calls for a fuse rated F, 125 V DC, 10 A max. Refer to the fuse
manufacturer’s data for further information.
Electrical Specification
Unless otherwise stated the specification applies over the entire input voltage, output load and temperature
ranges. Sense lines are connected directly to the power pins. Trim pin is left open.
Table 1: Input Specification
Parameter
Input Voltage
Max. Input Current
TXS75ZY
TXS75ZA
TXS75ZB
TXS80ZC
TXS80ZD
TXS100ZY
TXS100ZA
TXS100ZB
TXS100ZC
TXS100ZD
1
TXS120ZY
1
TXS120ZA
1
TXS120ZB
Inrush Current: All Types
(See figures 23/24)
Reflected Input Ripple Current
(See figure 21)
Stand-by Power
External Input Capacitance for
stable Operation [µF/P
o
]
(See page 22)
1
Preliminary data
U
i
Conditions/Description
Min
36
Nom
48
Max
75
2.9
3.55
4.2
5.0
6.2
Units
A
A
I
i max
U
i min
,
I
o max,
T
BP
= 100 °C
3.9
4.85
5.7
6.4
7.8
4.8
6.0
6.9
0
10
0.3
100
0.5
A
A
A
mAp-p
W
µF
/
125 W
I
inrush
I
i R
P
i off
C
i
U
i nom
,
I
o max
U
i nom
,
I
o max
Shut down active
REV. FEB 18, 2003
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Product Specification
TXS Series: 75…120 A DC-DC Converters
36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W
Table 2: Output Specification
Parameter
Set Point
TXSxxxZY
TXSxxxZA
TXSxxxZB
TXSxxxZC
TXSxxxZD
Output Voltage Accuracy
Static Line Regulation
(see figure 9)
Static Load Regulation
(see figure 10)
Output Voltage Deviation over
Temperature Range
U
o
Overall Tolerance
Output Voltage Ripple and Noise
(see figures 17/19)
RMS
Peak to Peak
Output Voltage Trim Range
2/ 3
Output Current
TXS75xx
TXS80xx
TXS100xx
TXS120xx
Output Current Limit Threshold
Efficiency
TXS75ZY
TXS100ZY
TXS75ZA
TXS100ZA
TXS75ZB
TXS100ZB
TXS80ZC
TXS100ZC
TXS80ZD
TXS100ZD
(see figures 1-4)
Switching Frequency
Input and Output Ripple
Frequency
Dynamic Load Regulation
(see figures 11/12)
Peak Deviation
Settling Time
Start Up Time (over
U
i
or
ON/OFF) (see figures 14-16)
Admissible Load Capacitance
(see figures 15/16)
1
3
1/3
Conditions/Description
Min
1.194
1.492
1.791
1.990
2.487
Nom
1.2
1.5
1.8
2.0
2.5
± 0.05
± 0.05
Max
1.206
1.508
1.809
2.010
2.513
± 0.5
± 0.1
± 0.1
± 0.3
±1
Units
U
o
U
i nom
, 50%
I
o max
,
T
A
= 25 °C
V DC
%
U
o
%
U
o
%
U
o
%
U
o
%
U
o
U
i min
to
U
i max
,
I
o max
,
T
A
= 25 °C
U
i nom
,
0 to 100 %
I
o max
,
T
A
= 25 °C
U
i nom
,
I
o max
U
r
U
TR
U
i min
to
U
i max
,
I
o min
to
I
o max
T
A
= 25 °C
20 MHz Bandwidth
U
i min
to
U
i max
,
I
o min
to
I
o max
± 10
0
0
0
0
4
7
30
16
70
mV
mV
%
U
o nom
I
o
U
i min
to
U
i max
75
80
100
120
130
88.0
87.5
89.0
88.5
90.0
89.5
91.0
90.5
91.0
90.5
190
760
A DC
I
lim
Hiccup, self recovery
110
%
I
o nom
η
U
i nom
,
I
o max
%
F
s
4·F
s
kHz
kHz
∆
I
o
= 25 A,
dI
o
/dt = 2 A/µs
T
A
= 25 °C
± 10
100
11
0
15
100
%
U
o nom
µs
ms
mF
U
i nom
,
I
o max
C
o
2
U
i nom
,
I
o max
4
Wide trim range optional
No minimum load required
Reduced output power
of models ZB (1.8 V) and ZD (2.5 V) at minimum input voltage, highest base plate temperature
and increased
U
o
(via Trim or Sense). Explanation and limits see page 16.
Timing diagram hiccup mode: see figure 37.
REV. FEB 18, 2003
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Product Specification
TXS Series: 75…120 A DC-DC Converters
36 to 75 V DC Input, 1.2, 1.5, 1.8, 2.0 and 2.5 V Output, 90 W to 250 W
Table 3: Control Specification
Parameter
1
Conditions/Description
Min
-1
1.5
-1
1.5
Nom
Max
1.5
5.5
1.5
5.5
Units
V
Shut Down Control
(ON/OFF, Pin 3)
U
i nom
Referenced to
Unit disabled if shut down low
Unit operating if active high or open V
i
(-) (pin 1)
Inverse Shut Down
(ON/OFF, Pin 3)
Unit operating if shut down low
Unit disabled if active high or open
Shut Down Sink Current
Trim Input
1
2
3
2
1/3
U
i nom
referenced to
V
i
(-) (pin 1)
Standard shut down,
U
SD
= 0
Inverted shut down,
U
SD
= 0
Referenced to
sense (-) (pin 8)
V
mA
mA
(I
SD
)
(Trim, Pin 7)
0.02
0.12
0
20
U
o
V
kΩ
Trim Input Impedance
Shut down control signal = TTL compatible, see page 14
Control function and block diagram for
U
o
adjustment over a trim voltage
U
TR
or a trim resistor
R
TR
see pages 13/14.
Inverse shut down = option N.
Table 4: Protection Specification
Parameter
Input Under Voltage Lockout
Overload Protection
Output OVP
Models ZA, ZB, ZY
Models ZC, ZD
Over Temperature Shut Down
Over Temperature Hysteresis
1
Conditions/Description
Turn on
Turn off
Hiccup (self recovery)
Continuous limitation,
no switch off
Automatic recovery
(Thermistor)
Measurement point on PCB
Min
31
110
Nom
34
32
Max
36
130
Units
V
%
I
o max
%
U
o set
°C
K
1
125
115
120
5
U
o set
: Output voltage adjusted over trim or sense.
EMC and Reliability Specification
Table 5: EMC
Parameter
Electrostatic Discharge
Air
Contact
Electromagnetic Field
Fast Transients/Burst
To Input
To Output
Electromagnetic Emission
1
2
3
Conditions/Description
IEC/EN 61000-4-2, level 4
U
i nom
,
I
o max
IEC/EN 61000-4-3, level 2
IEC/EN 61000-4-4, level 4
U
i max
,
I
o max
CISPR 22/EN 55022, conducted
2
Value
15 kV
15 kV
3 V/m
8 kV/2.5 kHz
2 kV/5 kHz
B
Performance
criterion A
criterion A
criterion A
pass
3
1
1
1
See page 22
Radiated emissions depend heavily on the implementation.
With external filter, see pages 20/21
REV. FEB 18, 2003
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