PD-97816
HTM27092S
HIGH RELIABILITY
DC-DC CONVERTER
Description
The HTM27092S is a single output 92W DC-DC converter
designed to operate in extremely high temperature environments
such as those encountered in oil exploration. Features include
small size, low weight and high tolerance to environmental
stresses such as wide wide temperature extremes, severe
shock and vibration. All internal components and assembly
processes have been selected and developed to ensure reliable
performance in the intended operating environments.
The converter incorporates a fixed frequency forward topology
with magnetic feedback and internal EMI filter. It also includes
an external inhibit port and have an adjustable output voltage.
It is enclosed in a hermetic 4.5" x 2.15" x 0.40" (4.0"x1.5"x0.40"H
excluding mounting tabs and I/O pins) AlSi package and weighs
less than 80 grams. The package utilizes rugged ceramic
feed-thru, copper-cored pins and is sealed using laser welding.
.
Full environmental screening includes temperature cycling,
constant acceleration, fine and gross leak, and burn-in. Please
refer to Device Screening table. Variations in electrical
specifications and screening to meet custom requirements
can be accommodated
165°C, 270V Input, 92W, 92V Single Output
HTM
Features
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190 to 400V DC Input Range
Up to 92W Output Power
92V, 1.0A Rated Output Voltage and Current
Internal EMI Filter
Magnetically Coupled Feedback
80% Minimum Efficiency
-20°C to +165°C continuous with transient up to +175°C
100MΩ @ 500V DC Isolation
Under-Voltage Lockout
Short Circuit and Overload Protection
Output Over Voltage Limiter
Adjustable Output Voltage within 10% of nominal
External Inhibit
Low Weight < 80 grams
Circuit Description
The HTM27092S converter utilizes an enhanced forward
topology with two power switches and resonant reset. The
nominal switching frequency is 520 kHz. Electrical isolation
and tight output regulation are achieved through the use of a
magnetically coupled feedback. Voltage feed-forward with
duty factor limiting provides high line rejection and protection
against output over voltage due to certain component failures
in the internal control loop. This mechanism limits the maximum
output voltage to approximately 20% over the nominal
regardless of the line voltage with an output load that is
≥
25% of the full rated output power.
Output current is limited under load fault conditions to
approximately 125% of the rating. An overload condition
causes the converter output to behave like a constant current
source with the output voltage dropping below nominal. The
converter will resume normal operation when the load current
is reduced below the current limit point. This protects the
converter from both overload and short circuit conditions.
Applications
n
Down Hole Exploration Tools
The current limit point exhibits a slightly negative
temperature coefficient to reduce the possibility of
thermal runaway.
An external Inhibit port An external inhibit port (Pin 4) is
provided to control converter operation.The converter’s
operation is inhibited when this pin is pulled low. It is
designed to be driven by an open collector logic device.
The pin may be left open for normal operation and has
a nominal open circuit voltage of 4V with respect to the
input return (Pin 2).
The output voltage of all models can be adjusted using
a single external resistor within
±10%
of nominal output
voltage.
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HTM27092S
Absolute Maximum Ratings
Input voltage range
Output power
Lead temperature
Operating case temperature
Storage temperature
PRELIMINARY
Recommended Operating Conditions
Input voltage range
Output power
Storage temperature
190Vdc to 400Vdc
0 to Max. Rated
-20°C to +165°C
-20°C to +165°C
-0.5Vdc to +400Vdc
Internally limited
-20°C to +175°C
-55°C to +175°C
+300°C for 10 seconds Operating temperature
Electrical Performance Characteristics
Conditions
-20°C
≤
T
C
≤
+165°C
Group A
V
IN
= 270V DC
±
5%, C
L
= 0
unless otherwise specified
Limits
Min.
190
Parameter
Input Voltage
Output Voltage ( V
OUT
)
Output Power ( P
OUT
)
Output Current ( I
OUT
)
Line Regulation ( VR
LINE
)
Subgroup
Nom.
270
Max.
400
94
92
1.05
900
Unit
V
V
W
A
mV
1,2,3
1,2,3
1,2,3
1,2,3
I
OUT
= 100% Rated Load, Note 1
V
IN
= 190, 270, 400 Volts, Note 2
V
IN
= 190, 270, 400 Volts, Note 2
V
IN
= 190, 270, 400 Volts, Notes 1, 4
I
OUT
= 10, 50, 100% Rated Load
V
IN
= 190, 270, 400 Volts, Notes 1, 4
I
OUT
= 10, 50, 100% Rated Load
90
0
0
-900
Load Regulation ( VR
LOAD
)
Input Current, No Load ( I
IN
)
Input Ripple Current
Input Current Inhibited
Input Under Voltage Lockout
Turn-on (Input Voltage Rising)
Turn-off (Input Voltage Decreasing)
Output Ripple ( V
RIP
)
Efficiency ( E
FF
)
Switching Frequency ( F
S
)
Synchronization Input
Frequency Range
Pulse Amplitude, High
Pulse Amplitude, Low
Pulse Rise Time
Pulse Duty Cycle
1,2,3
-920
920
mV
1,2,3
1,2,3
1,2,3
1,3
2
1,2,3
1,2,3
1,2,3
1,2,3
I
OUT
= 0. Pin 4 open
I
OUT
= 100% Rated Load, BW = 10MHz
Pin 4 shorted to Pin 2
160
160
135
V
IN
= 190, 270, 400 Volts, Notes 1, 3
I
OUT
= 10%, 100% Rated Load
I
OUT
= 100% Rated Load , Note 1
Sync. Input (Pin 6) open
80
470
85
20
230
5.0
180
190
160
600
mA
mA
P-P
mA
Min Load, Note 1
V
mVP-P
%
580
kHz
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
Notes 1, 12
500
4.0
-0.5
600
10
0.8
100
kHz
V
V
ns
%
20
80
For Notes to Electrical Performance Characteristics, refer to page 4
2
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PRELIMINARY
Electrical Performance Characteristics
(continued)
HTM27092S
Conditions
Group A
-20°C
≤
T
C
≤
+165°C
V
IN
= 270V DC
±
5%, C
L
= 0
unless otherwiese specified
Notes 1, 12
Limits
Min.
3.0
-0.5
Parameter
Enable Input ( Inhibit Function )
Open Circuit Voltage
Drive Current ( Sink )
Voltage Range
Current Limit Point
Expressed as a Percentage
of Full Rated Output Power
Power Dissipation, Load Fault ( P
D
)
Load Transient Response
Amplitude
Recovery
Amplitude
Recovery
Line Transient Response
Amplitude
Recovery
Turn-on Response
Overshoot ( V
OS
)
Turn-on Delay ( T
DLY
)
Capacitive Load ( C
L
)
Subgroup
1,2,3
Nom.
Max.
5.0
100
50
Unit
V
µA
V
%
W
1,2,3
1,2,3
V
OUT
= 90% of Nominal
Short Circuit, Overload, Note 7
105
150
35
4,5,6
Load Step, 50% to/from 100%
Notes 1, 8
-5000
+5000
1200
mV
µs
mV
µs
4,5,6
Load Step, 10% to/from 50%
Notes 1, 8
Input Voltage Step, 190V to/from 400V
-5000
+5000
1200
4,5,6
I
OUT
= 100% Rated Load
Notes 1, 9, 10
V
IN
= 190, 270, 400 Volts
-3000
+3000
1500
2000
mV
µs
mV
ms
µF
4,5,6
I
OUT
= 50% Rated Load
Notes 1, 11
I
OUT
= 100% Rated Load
5.0
1000
60
1
No effect on DC Performance
Notes 1, 5, 6, 12
MIL-STD-461, CS101
30Hz to 50KHz, Notes 1, 12
Input to Output or Any Pin to Case
except Pin 10, test @ 500VDC
Line Rejection
Isolation
Device Weight
1
1
40
100
50
dB
ΜΩ
80
g
For Notes to Electrical Performance Characteristics, refer to page 4
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HTM27092S
PRELIMINARY
Notes for Electrical Performance Characteristics
Table
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Unless otherwise specified, “Rated” load is 92 watts, 1.0 Amps.
Parameter verified during line and load regulation tests.
Guaranteed for a D.C. to 20 MHz bandwidth. Tested using a 20 kHz to 10 MHz bandwidth.
Load is varied for output under test. Regulation relative to output voltage at 50% rated load.
Capacitive load may be any value from 0 to the maximum limit without compromising dc performance.
A capacitive load in excess of the maximum limit may interfere with the proper operation of the
converter’s overload protection, causing erratic behavior during turn-on.
Overload power dissipation is defined as the device power dissipation with the load set such that
V
OUT
= 90% of nominal.
Load step transition time
≥
10µs.
Recovery time is measured from initiation of the transient to where V
OUT
has returned to within
±1%
of
steady state value.
Line step transition time
≥
100µs.
Turn-on delay time from either a step application of input power or a logic low to a logic high transition on
the inhibit pin to the point where V
OUT
= 90% of nominal.
Parameter is tested as part of design characterization or after design changes. Thereafter, parameter
shall be guaranteed to the limits specified.
Fig 1. Circuit for Measuring Output Ripple Voltage
50
Ω
50
Ω
Coax
1 µF
Oscilliscope or Equivalent
with 10 MHz Bandwidth.
Multiply readings by 2.
50
Ω
Termination
0.1 µF
+ Vout
DUT
Return
R
L
for I
RATED
4
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PRELIMINARY
HTM27092S
Typical Efficiency Curves
Fig 2: Efficiency vs Output Current at 25°C with Vin = 190V, 270V and 400V
E fficiency vs Output Current at 25°C
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.05
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.15
0.25
0.35
0.45
0.55
0.65
E fficiency
190V Vin
270V Vin
400V Vin
0.8
0.75
0.85
0.9
Output Current, A
Fig 3: Efficiency vs Output Current at 165°C with Vin = 190V, 270V and 400V
E fficiency vs Output Current at 165°C
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.05
0.15
0.25
0.35
0.45
0.55
0.65
E fficiency
190V Vin
270V Vin
400V Vin
0.8
0.75
0.85
0.9
0.95
0.95
Output Current, A
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