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PDF HTA20012S Data sheet ( Hoja de datos )
| Número de pieza | HTA20012S | |
| Descripción | HIGH RELIABILITY DC-DC CONVERTER | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
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PD-97309B
HIGH RELIABILITY
DC-DC CONVERTER
HTA-SERIES
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 3.805" x 1.5"
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. Non-
screened versions of the HTA converters are available for
system development purposes. Variations in electrical
specifications and screening to meet custom requirements
can be accommodated.
Circuit Description
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.
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.
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
n Down Hole Exploration Tools
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.
The current limit point exhibits a slightly negative temperature
coefficient to reduce the possibility of thermal runaway.
www.irf.com
1
07/30/10
www.DataSheet.in
1 page  
HTA-SERIES
Notes for Electrical Performance Characteristics Table
1. Parameter is tested as part of design characterization or after design changes. Thereafter, parameter shall be
guaranteed to the limits specified.
2. Parameter verified during line and load regulation tests.
3. Output load current must be distributed such that at least 20% of the total load current is being provided by one
of the outputs.
4. Load current split equally between outputs on dual output models.
5. 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.
6. Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit on
page 6.
7. 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.
8. Overload power dissipation is defined as the device power dissipation with the load set such that VOUT = 90% of
nominal.
9. 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.
10. Transient recovery time is from the change in load condition until the output is within 3% of the nominal output
voltage.
11. Recovery time is measured from initiation of the transient to where VOUT has returned to within ±1% of VOUT at
50% load.
12. Load transient time ≥ 10µs.
Fig I. Circuit for Measuring Output Ripple Voltage
+ Vout
DUT Return
50 Ω
0.1 µF
50 Ω Coax
1 µF
Oscilliscope or Equivalent
with 10 MHz Bandwidth.
Multiply readings by 2.
50 Ω
Termination
RL for IRATED
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5
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5 Page 
HTA-SERIES
Efficiency Curve for HTA20003R3S
Fig VIII. Efficiency vs. Temperature
75
74
73
72
71
70
69
68
67
66
65
0 20 40 60 80 100 120 140 160 180 200
Temperature C
150 Vin
200 Vin
250 Vin
Efficiency Curve for HTA20005S
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0
Fig IX. 25°C Efficiency vs. Output Loading
12 34
Output Load (A)
5
www.irf.com
150 Vin
200 Vin
250 Vin
11
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| PDF Descargar | [ Datasheet HTA20012S.PDF ] | |
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