IRF HTA High reliability dc/dc converter Datasheet

PD-97309A
HTA-SERIES
HIGH RELIABILITY
DC/DC CONVERTER
200V Input, Single/Dual Output
Description
The HTA Series of DC/DC converters is a family of 20W,
single and dual output, high reliability devices designed to
operate in extremely high temperature environments such as
those encountered in oil exploration applications. Features
include small size, low weight and high tolerance to
environmental stresses such as wide temperature extremes,
severe shock and vibration. All internal components are
derated to meet the intended operating environment.
Documentation including electrical stress and thermal analysis
are available.
The converters incorporate a fixed frequency single forward
topology with magnetic feedback and internal EMI filter. All
models include an external inhibit port and have an adjustable
output voltage. They are enclosed in a hermetic 1.5" x 4.0" x
0.430" AlSi package and weigh less than 70grams. The
package utilizes rugged ceramic feed-thru copper core pins
and is sealed using parallel seam welding.
Full environmental screening includes temperature cycling,
constant acceleration, fine and gross leak, and burn-in. Nonscreened versions of the HTA converters are available for
system development purposes. Variations in electrical
specifications and screening to meet custom requirements
can be accommodated.
Features
n 150 to 250V DC Input Range
n Up to 20W Output Power
n Single and Dual Output Models Include
3.3, 5, 12, 15, ±5, ±12 and ±15V
n Internal EMI Filter
n Magnetically Coupled Feedback
n High Efficiency - to 76%
n -35°C to +185°C Operating Case Temperature Range
n 10MΩ @ 500VDC Isolation
n Under-Voltage Lockout
n Short Circuit and Overload Protection
n Output Over Voltage Limiter
n Adjustable Output Voltage
n Synchronization Input and Output
n External Inhibit
n Low Weight, < 70grams
Applications
Circuit Description
n Down Hole Exploration Tools
The HTA series of converters utilize a single-ended forward
topology with resonant reset. The nominal switching frequency
is 500KHz. 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 in the
event of an internal control loop failure. This mechanism
limits the maximum output voltage to approximately 20% over
the nominal regardless of the line voltage.
The current limit point exhibits a slightly negative
temperature coefficient to reduce the possibility of
thermal runaway.
Output current is limited under any load fault condition to
approximately 125% of rated load at maximum operating case
temperature. 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.
www.irf.com
An external Inhibit port 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 4.0V with respect to the Input Return (pin 2).
The output voltage of all models can be adjusted using
a single external resistor.
1
03/03/09
HTA-SERIES
Absolute Maximum Ratings
Maximum Operating Conditions
Input voltage range
-0.5Vdc to +300Vdc
Input voltage range
150Vdc to 250Vdc
Output power
Internally limited
Output power
0 to Max. Rated
Lead temperature
+300°C for 10 seconds Operating temperature
Operating case temperature
-35°C to +185°C
Storage temperature
-55°C to +185°C
-35°C to +185°C
Electrical Performance Characteristics
Parameter
Group A
Subgroup
Conditions
-35°C ≤ TC ≤ +185°C
VIN = 200V DC ± 5%, CL = 0
unless otherwise specified
Input Voltage
Output voltage ( Vout )
HTA2003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
1
1
1
1
1
1
1
IOUT = 100% rated load
Note 4
Limits
Min
Nom
Max
Unit
150
200
250
V
3.25
4.95
11.88
14.85
±4.95
±11.88
±14.85
3.30
5.00
12.00
15.00
±5.00
±12.00
±15.00
3.35
5.05
12.12
15.15
±5.05
±12.12
±15.15
V
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
Output power ( POUT )
Output current ( IOUT )
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
2,3
2,3
2,3
2,3
2,3
2,3
2,3
IOUT = 100% rated load
Note 4
3.20
4.85
11.64
14.55
±4.85
±11.64
±14.55
3.40
5.15
12.36
15.45
±5.15
±12.36
±15.45
1,2,3
VIN = 150, 200, 250 Volts, Note 2
0
20
W
1,2,3
VIN = 150, 200, 250 Volts, Note 2
6.10
4.00
1.67
1.33
3.20
1.34
1.06
A
Either Output, Note 3
Either Output, Note 3
Either Output, Note 3
0
0
0
0
0
0
0
Line regulation ( VRLINE )
1,2,3
VIN = 150, 200, 250 Volts
IOUT = 0, 50%, 100% rated, Note 4
-0.5
+0.5
%
Load regulation ( VRLOAD )
1,2,3
IOUT = 0, 50%, 100% rated, Note 4
VIN = 150, 200, 250 Volts
-1.0
+1.0
%
1,2,3
VIN = 150, 200, 250 Volts
Duals only, Note 5
-5.0
-3.0
-3.0
5.0
3.0
3.0
%
Cross regulation ( VRCROSS )
HTA20005D
HTA20012D
HTA20015D
For Notes to Electrical Performance Characteristics, refer to page 5
2
www.irf.com
HTA-SERIES
Electrical Performance Characteristics
Parameter
Input current, no load ( IIN )
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
Input current inhibited
Output ripple ( VRIP )
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
Switching frequency ( FS )
( continued )
Group A
Subgroup
Conditions
-35°C ≤ TC ≤ +185°C
VIN = 200V DC ± 5%, CL = 0
unless otherwise specified
1,3
Limits
Max
Unit
IOUT = 0, Pin 4 open
20
mA
2
IOUT = 0, Pin 4 open
30
mA
1,2,3
Pin 4 shorted to pin 2
5.0
mA
1,3
VIN = 150, 200, 250 Volts
IOUT = 100% rated load
Notes 4, 6
50
50
70
80
80
80
80
mV p-p
25
25
35
40
40
40
40
mV p-p
650
KHz
2
Min
Nom
VIN = 150, 200, 250 Volts
IOUT = 100% rated load
Notes 4, 6
1,2,3
Sync. Input (Pin 4) open
500
550
1
IOUT = 100% rated load
Note 4
70
75
76
76
75
76
76
74
78
79
79
78
79
79
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
2
IOUT = 100% rated load
Note 4
65
70
71
71
70
71
71
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
3
IOUT = 100% rated load
Note 4
68
73
74
74
73
73
73
Efficiency ( EFF )
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
For Notes to Electrical Performance Characteristics, refer to page 5
www.irf.com
%
3
HTA-SERIES
Electrical Performance Characteristics
Parameter
Under Voltage Lockout
Turn-on
( input voltage rising )
Turn-off
( input voltage decreasing )
Synchronization
Frequency Range
Pulse Amplitude, High
Pulse Amplitude, Low
Pulse Rise Time
Pulse Duty Cycle
Group A
Subgroup
1,2,3
( continued )
Conditions
-35°C ≤ TC ≤ +185°C
VIN = 200V DC ± 5%, CL = 0
unless otherwise specified
Min
Nom
No load, Full load
Notes 1, 4
Unit
146
V
Note 1
500
2.0
-0.5
20
Transient Recovery Specification
Max
119
1,2,3
1,2,3
1,2,3
1,2,3
Limits
650
10
0.8
100
80
KHz
V
V
ns
%
Notes 4, 10, 11, 12
Transient Load Response
Half to Full Load
4,5,6
Overshoot
Recovery Time
10
300
%
µs
Transient Load Response
Full to Half Load
4,5,6
Overshoot
Recovery Time
10
450
%
µs
Transient Load Response
10% to Half Load
4,5,6
Overshoot
Recovery Time
15
300
%
µs
Transient Load Response
Half to 10% Load
4,5,6
Overshoot
Recovery Time
15
450
%
µs
1,2,3
Note 1
-0.5
5.0
100
50
V
µA
V
115
105
130
175
150
220
%
30
W
10
200
%
ms
2200
1000
180
120
500
90
60
µF
Enable Input ( Inhibit Function )
open circuit voltage
drive current ( sink )
voltage range
Current Limit Point
Expressed as a percentage
of full rated load current
1
2
3
VOUT = 90% of Nominal, Note 4
Power dissipation, load fault ( PD )
1,2,3
Short Circuit, Overload, Note 8
4,5,6
No Load, Full Load
Notes 4, 9
Turn-on Response
Overshoot ( VOS)
Turn-on Delay (TDLY )
Capacitive Load ( CL )
HTA20003R3S
HTA20005S
HTA20012S
HTA20015S
HTA20005D
HTA20012D
HTA20015D
1
3.0
2.0
IOUT = 100% rated load
No effect on DC performance
Notes 1, 4, 7
Each output on duals
Line Rejection
1
Isolation
1
MIL-STD-461, CS101
30Hz to 50KHz, Notes 1, 4
Input to Output or Any Pin to Case
except pin 3, test @ 500VDC
Device Weight
40
50
dB
100
MΩ
70
g
For Notes to Electrical Performance Characteristics, refer to page 5
4
www.irf.com
HTA-SERIES
Notes for Electrical Performance Characteristics Table
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Parameter is tested as part of design characterization or after design changes. Thereafter, parameter shall be
guaranteed to the limits specified.
Parameter verified during line and load regulation tests.
Output load current must be distributed such that at least 20% of the total load current is being provided by one
of the outputs.
Load current split equally between outputs on dual output models.
Cross regulation is measured with 20% rated load on output under test while changing the load on the other
output from 20% to 80% of rated.
Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit on
page 6.
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 VOUT = 90% of
nominal.
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 (pin 4) to the point where VOUT = 90% of nominal.
Transient recovery time is from the change in load condition until the output is within 3% of the nominal output
voltage.
Recovery time is measured from initiation of the transient to where VOUT has returned to within ±1% of VOUT at
50% load.
Load transient time ≥ 10µs.
Fig I. Circuit for Measuring Output Ripple Voltage
50 Ω
50 Ω Coax
1 µF
Oscilliscope or Equivalent
with 10 MHz Bandwidth.
Multiply readings by 2.
0.1 µF
+ Vout
50 Ω
Termination
DUT
Return
RL for IRATED
www.irf.com
5
HTA-SERIES
Fig II. Block Diagram - Single Output
D C INP UT
IM P UT
FILTE R
1
E NA B LE
4
CA S E
3
INP U T RE TU RN
2
OU TP UT
FILTE R
PR IM A R Y
BI AS S UP P LY
CU R RE N T
S E NS E
7
+ OU TPU T
8
OU TPU T R ETU RN
DRIVE R
E R ROR
AMP
& RE F
SE N SE
A M P LIFIE R
SY N C.
IN PU T
6
S Y N C.
O UTP U T
5
11
TRIM
12
N/ C
10
+S E N SE
9
-S EN S E
C ON TRO L
V FB
Fig III. Block Diagram - Dual Output
DC INP UT
EN AB LE
CA SE
1
4
IM P UT
F ILT ER
O U TP UT
F ILT ER
P RIM A RY
B IAS SU PP LY
C URR EN T
S E NS E
O U TP UT
F ILT ER
3
7
+O UT PU T
8
O UT P UT RE T URN
9
-O UT P UT
D R IV ER
INP U T R ET UR N
2
E RRO R
A MP
& RE F
S YN C.
IN PU T
6
S YN C.
O UT P UT
5
6
10
T RIM
11
N/C
12
N/C
CO N TR O L
VFB
www.irf.com
HTA-SERIES
Technical Notes:
Remote Sensing
Output Voltage Adjust - Single Output Models
This feature is available only for single output models.
Connection of the + Sense and - Sense leads at a remotely
located load permits compensation for resistive voltage drop
between the converter output and the load when they are
physically separated by a significant distance. This
connection allows regulation to the placard voltage at the
point of application. When the remote sensing features is
not used, the sense leads should be connected to their
respective output terminals at the converter. A combination
of the compensation voltage drop and output voltage
adjustment (described below in the ‘Output Voltage
Adjustment’ section) is limited to 10% of the nominal output
voltage.
In addition to permitting close voltage regulation of remotely
located loads, it is possible to utilize the converter sense
pins to incrementally increase the output voltage. The
increased output voltage is limited to 10% maximum. The
adjustments made possible by this method are intended as
a means to “trim” the output to a voltage setting for certain
design application, but are not intended to create an
adjustable output converter. These output voltage setting
variations are obtained by connecting a resistor with an
appropriate value between the +Sense and -Sense pins
while connecting the -Sense pin to the Output Return pin as
shown in Fig IV below. The resistance value for a desired
output voltage can be determined by use of the equation
presented below.
Inhibiting Converter Output
As an alternative to application and removal of the DC voltage
to the input, the user can control the converter output by
providing TTL compatible, positive logic signal to Enable pin
(pin 4) and to Input Return (pin 2). Enable signal is internally
pulled “high” so that when not used, an open connection on
the Enable pin permits normal converter operation. When
its use is desired, a logical “low” on this port will shut the
converter down.
Synchronization of Multiple Converters
When operating multiple converters, system requirements
often may require operation of the converters at a common
frequency. To accommodate this requirement, the HTA
series of converters provide both a synchronization input
and output.
The Sync Input port permits synchronization of a HTA
connverter to any compatible external frequency source
operating between 500KHz and 650KHz. This input signal
should be referenced to the Input Return and have a 10%
to 90% duty cycle. Compatibility requires transition times
less than100ns, maximum low level of +0.8V and a minimum
high level of +2.0V. The Sync Output of another converter
which has been designated as the master oscillator provides
a convenient frequency source for this mode of operation.
When external synchronization is not required, the Sync In
pin should be left unconnected thereby permitting the
converter to operate at its own internally set frequency.
⎧
⎫
VNOM
⎬
Radj = 100 • ⎨
⎩VOUT - VNOM -.025 ⎭
Where
VNOM = device nominal output voltage, and
VOUT = desired output voltage
Finding a resistor value for a particular output voltage, is
simply a matter of substituting the desired output voltage
and the nominal device voltage into the equation and solving
for the corresponding resistor value. Under no circumstance
should RADJ be less than 500Ω.
Fig IV. Connection for VOUT Adjustment
N/C
Trim
HTA200XXS
+ Sense
RADJ
- Sense
Output Return
+ Output
To
Load
The sync output signal is a continuous pulse train set at
550 ± 50KHz, with a duty cycle of 15 ± 5.0%. This signal is
referenced to the Input Return and has been tailored to be
compatible with the HTA Sync Input port. Transition times
are less than 100ns and the low level output impedance is
less than 50Ω. This signal is active when the DC input
voltage is within the specified operating range and the
converter is not inhibited. This output has adequate drive
reserve to synchronize at least five additional converters.
www.irf.com
7
HTA-SERIES
Examination of the equation relating output voltage and
resistor value reveals a special benefit of the circuit topology
utilized for remote sensing of output voltage in the
HTA200XXS series of converters. It is apparent that as the
resistance increases, the output voltage approaches the
nominal set value of the device. In fact the calculated limiting
value of output voltage as the adjusting resistor becomes
very large, is ≈ 25mV above nominal device voltage.
The consequence is that if the +sense connection is
unintentionally broken, an HTA200XXS has a fail-safe output
voltage of Vout + 25mV, where the 25mV is independent of
the nominal output voltage. It can be further demonstrated
that in the event of both the +Sense and -Sense connections
being broken, the output will be limited to Vout + 440mV.
This 440mV is also essentially constant independent of the
nominal output voltage. While operation in this condition is
not damaging to the device, not all performance parameters
will be met.
Output Voltage Adjust - Dual Output Models
By use of the Trim pin (10), the magnitude of output voltages
can be adjusted over a limited range in either a positive or
negative direction. Connecting a resistor between the trim
pin and either the output return or the positive output will
raise or lower the magnitude of output voltages. The span
of output voltage adjustment is restricted to the limits shown
in Table I.
Table 1. Output Voltage Trim Values and Limits
HTA20005D
HTA20012D
VOUT
VOUT
RADJ
RADJ
HTA20015D
VOUT
RADJ
5.5
0
12.5
0
15.5
0
5.4
12.5K
12.4
47.5K
15.4
62.5K
5.3
33.3K
12.3
127K
15.3
167K
5.2
75K
12.2
285K
15.2
375K
5.1
200K
12.1
760K
15.1
1.0M
5.0
∞
12.0
∞
15.0
∞
4.9
190K
11.7
975K
14.6
1.2M
4.8
65K
11.3
288K
14.0
325K
4.7
23K
10.8
72.9K
13.5
117K
4.6
4.583
2.5K
0
10.6
10.417
29.9K
0
13.0
12.917
12.5K
0
8
Note that the nominal magnitude of output voltage resides in
the middle of the table and the corresponding resistor value
is set to ∞. To set the magnitude greater than nominal, the
adjust resistor is connected to output return. To set the
magnitude less than nominal, the adjust resistor is
connected to the +Output. (Refer to Fig V.)
Fig V. Connection for VOUT Adjustment
N/C
Trim
HTA200XXD
- Output
+ Output
ADJ
+
N/C
Output Return
Connect R
RADJ
To
Loads
to + to increase, - to decrease
For output voltage settings that are within the limits, but
between those listed in Table I, it is suggested that the
resistor values be determined empirically by selection or by
use of a variable resistor. The determined value can then
be replaced with a good quality fixed resistor for permanent
installation.
When use of this adjust feature is elected, the user should
be aware that the temperature performance of the converter
output voltage will be affected by the temperature
performance of the resistor selected as the adjustment
element and therefore, is advised to employ resistors with a
very small temperature coefficient of resistance.
www.irf.com
HTA-SERIES
Application Notes:
DC-DC converters constructed with aluminium-silicon
(ALSi) controlled expansion alloy benefit from low mass,
high thermal conductivity, and CTE match to substrates
mounted in them. The one disadvantage over traditional
cold rolled steel packages (CRS) however is that the ALSi
material is more brittle than the CRS. For this reason, it is
important to avoid using a thermal pad or gasket.
The HTA-Series DC-DC converter requires 8-32 size
screws and #8 flat washers.
The minimum recommended mouting surface flatness is
0.002” per inch.
www.irf.com
The Procedure for mounting the converter is as follows:
1.
Check all surfaces for foreign material, burrs, or
anything that may interfere with the different parts.
2. Place the converter on the mounting surface and line it
up with mounting holes.
3. Install screws using appropriate washers and tighten
by hand (~ 4 in.oz) in the sequence shown below in the
diagram.
.
4. Tighten the screws with appropriate torque driver using
a controlled torque of up to 20-24 in.lb in the sequence
as shown in the diagram.
9
HTA-SERIES
Efficiency Curves for HTA20003R3S
Fig VI. 25°C Efficiency vs. Output Loading
90
80
70
Efficiency %
60
50
150 Vin
200 Vin
250 Vin
40
30
20
10
0
0
1
2
3
4
5
6
7
Output Load (A)
Fig VII. 185°C Efficiency vs. Output Loading
90
80
70
Efficicency %
60
50
150 Vin
200 Vin
250 Vin
40
30
20
10
0
0
1
2
3
4
5
6
7
Output Load (A)
10
www.irf.com
HTA-SERIES
Efficiency Curve for HTA20003R3S
Fig VIII. Efficiency vs. Temperature
75
74
73
Efficiency %
72
71
150 Vin
200 Vin
70
250 Vin
69
68
67
66
65
0
20
40
60
80
100
120
140
160
180
200
Temperature C
Efficiency Curve for HTA20005S
Fig IX. 25°C Efficiency vs. Output Loading
90%
80%
70%
Efficiency
60%
50%
150 Vin
200 Vin
40%
250 Vin
30%
20%
10%
0%
0
1
2
3
4
5
Output Load (A)
www.irf.com
11
HTA-SERIES
Efficiency Curves for HTA20005S
Fig X. 185°C Efficiency vs. Output Loading
90%
80%
70%
Efficiency
60%
50%
150 Vin
40%
200 Vin
250 Vin
30%
20%
10%
0%
0
1
2
3
4
5
Output Load (A)
Efficiency
Fig XI. Efficiency vs. Temperature
85%
83%
81%
79%
77%
75%
73%
71%
69%
67%
65%
150 Vin
200 Vin
250 Vin
0
50
100
150
200
Tem perature C
12
www.irf.com
HTA-SERIES
Mechanical Diagram
0.245
Ø0.266
1.500
1.100
1
12
2
11
3
10
4
9
5
8
6
7
0.250
0.200 Typ.
Non-cum.
1.000
Ref.
Pin
Ø 0.040
0.200
2.500
3.600
4.000 MAX.
0.238 MAX.
0.430
Max.
0.075
NOTES: UNLESS OTHERWISE SPECIFIED, DIMENSIONAL TOLERANCE IS: 0.005"
Pin Designation (Single/Dual)
Pin #
Single
Dual
1
DC Input
DC Input
2
Input Return
Input Return
3
Case
Case
4
Enable
Enable
5
Sync. Output
Sync. Output
6
Sync. Input
Sync. Input
7
+ Output
+ Output
8
Output Return
Output Return
9
- Sense
- Output
10
+ Sense
N/C
11
12
Trim *
N/C
Trim
N/C
* Trim pin for Single Output models is reserved for future use.
This pin must not be used or connected for any purpose.
www.irf.com
13
HTA-SERIES
Device Screening
Requirement
MIL-STD-883
Method
Condition
No Suffix
/EM suffix
Internal Visual
2017
-
Seal (Laser Weld)
1014
-
X
X
Fine Leak Test (Unpressurized)
-
-
X
X (For info only)
(Production (For Engineering
Qualilty)
Evaluation)
X
X
Gross Leak Test (Unpressurized)
-
-
X
X
Temperature Cycling
1010
-35°C, +185°C, 10 cycles
X
Not required
-
X
Not required
3000G for 1 minute
X
Not required
-
X
Not required
48 hrs @ 185°C
X
8 hours @ 185°C
-
X
X
Not required
In accordance with
Electrical
device specification
Constant Acceleration
2001
In accordance with
Electrical
device specification
Burn-in
1015
Final Electrical (Group A)
In accordance with
device specification
Fine Leak Test
1014
A2
X
Gross Leak Test
1014
C1
X
X
External Visual
2009
-
X
X
Part Numbering
HTA 200 05 S / EM
EM = Engineering Model (evalulation purposes)
Model
Input Voltage
Blank = No Suffix (production quality)
200 = 200V
(Please refer to Device Screening Table for specific
screening requirements)
Output Voltage
Output
03R3 = 3.3V, 05 = 5V
12 = 12V, 15 = 15V
S = Single
D = Dual
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105
IR SANTA CLARA: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 03/2009
14
www.irf.com