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PD - 94542A
AHF2815T SERIES
28V Input, Triple Output
HYBRID-HIGH RELIABILITY DC/DC CONVERTER
Description
The AHF2815T Series of DC/DC converters provide 8W of power and an extended temperature range for use in military and industrial applications. Designed to the nominal input requirements of MIL-STD-704, these devices have nominal 28VDC inputs with +5V and 15V triple outputs to satisfy a wide range of requirements. The basic circuit utilizes a pulse width modulated, feed forward topology at a nominal switching frequency of 550KHz. Input to output isolation is achieved through the use of transformers in the forward and feedback circuits. The proprietary magnetic feedback circuit provides for an extremely wide bandwidth control loop with a high phase margin. The closed loop frequency response of this converter family extends to approximately 50KHz, resulting in superior line and load transient characteristics. This feedback method is also inherently temperature and radiation insensitive. This gives the AHF Series an important advantage over converters that incorporate optocouplers in their design. Manufactured in a facility qualified to MIL-PRF-38534, these converters are fabricated utilizing DSCC qualified processes. For available screening options, refer to device screening table in the data sheet. Variations in electrical, mechanical and screening can be accommodated. Contact IR Santa Clara for special requirements.
AHF Features
16V to 40VDC Input Range (28VDC Nominal) 5V, 15V Output Infinite Short Circuit and Overload Protection 8W Output Power Fast Loop Response for Superior Transient Characteristics Operating Temperature Range from -55C to +125C Available Popular Industry Standard Pin-Out Resistance Seam Welded Case for Superior Long Term Hermeticity Efficiency Up to 75% Shutdown from External Signal 400,000 Hour MTBF at 85% Constant Switching Frequency (550KHz Nominal) Standard Microcircuit Drawing Available
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01/10/07
AHF2815T Series Specifications
TCASE = -55C to +125C, VIN = +28V 5% unless otherwise specified 7
Typical Characteristics
Conversion frequency
550KHz Recommended Operating temperature Storage case temperature -55C to +125C -65C to +135C
Temperature Range1
Test
Symbol
Conditions -55C Tc +125C Vin = 28 Vdc 5%, C L = 0 7 unless otherwise specified
Unit AHF2815T Limits Min Max 5.05 5.10 15.50 15.65 1200 66.7 60 80 5.0 1.5 1.5 8.0 25 35 75 50 75 15 50 50 T C = 25C T C = 25C T C = 25C 500 9.0 68 100 8.0 6.0 600 13 35 V V V V mA mA mV p-p mV p-p W W W W
STATIC CHARACTERISTICS 1 Output voltage
V OUT
IOUT = 0 (main) IOUT = 0 (dual)
1
Current1,2,3 Ripple Voltage
1,4
I OUT V RIP
Power
1,2,3
P OUT
V IN = 16, 28, and 40 Vdc (main) V IN = 16, 28, and 40 Vdc (dual) V IN = 16, 28, and 40 Vdc BW = DC to 2 MHz (main) V IN = 16, 28, and 40 VDC BW = DC to 2 MHz (dual) V IN = 16, 28, and 40 Vdc (main) (+dual) (-dual) (total) V IN = 16, 28, and 40 VDC IOUT = 120, 600,1200 mA (main) IOUT = 0, 33.4, 66.7 mA (dual) V IN = 16, 28, and 40 VDC IOUT = 120, 600, 1200mA (main) IOUT = 0, 33.4, 66.7 mA (dual) IOUT = 0, inhibit (pin 1) tied to input return (pin 7) IOUT = 0, inhibit (pin 1) = open IOUT = 1200mA (main) IOUT = 66.7 mA (dual) BW = DC to 2MHz P OUT = Full load Input to output or any pin to case (except pin 6) at 500 V dc Tc = +25C 5 Overload, TC = 25C Short Circuit, T C = 25C
TC = Over TC = Over
25C Temp 25C Temp
4.95 4.90 14.50 14.35 120 0.0
REGULATION 1,3 Line
VR LINE
Load1,3
VR LOAD
T C = 25C Over Temp
mV
Input current Ripple current Efficiency Isolation Load fault power dissipation3 Switching frequency Inhibit Open Circuit Voltage Weight
4
I IN I RIP E FF ISO PD FS V OI
mA mA mA p-p % M
W KHz V g
For Notes to Specifications, refer to page 3
2
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AHF2815T Series
Notes to Specifications
1. 2. 3. 4. 5. 6. 7. Tested at each output. Parameter guaranteed by line and load regulation tests. At least 20percent of the total output power should be taken from the (+5.0 volt) main output. Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. Above 125C case temperature, derate output power linearly to 0 at 135C case. TCASE = -55C to 85C for non screened grade.
Block Diagram
2 +Input 8 EMI Filter Filter & Regulator 4 Case 6 Primary Housekeeping Supply 5 -Vout +5Vout +Vout
3 Inhibit Input 1
Drive
Output Return
Pulse Width FB Modulator
CS
Error Amp & Ref
Input Return 7
Application Information
Inhibit Function
Connecting the inhibit input (Pin 1) to input common (Pin 7) will cause the converter to shut down. It is recommended that the inhibit pin be driven by an open collector device capable of sinking at least 400A of current. The open circuit voltage of the inhibit input is 11.5 1.0VDC. The total surface area of the AHF package is 4.9 square inches. If a worse case full load efficiency of 75% is assumed, then the case temperature rise can be calculated as follows:
Thermal Management
Assuming that there is no forced air flow, the package temperature rise above ambient (T) may be calculated using the following expression:
1 1 P = POUT - 1 = 2.66W - 1 = 8 .78 Eff
T = 80 (4.9)
-0.7
(2.66)
0.85
= 60.4C
T = 80 A
-0.7
p
0.85
(C)
Hence, if T AMBIENT = +25C, the DC/DC converter case temperature will be approximately 85C if no heat sink or air flow is provided.
where A = the effective surface area in square inhes (including heat sink if used), P = power dissipation in watts.
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit Drawing Number
5962-94623
Vendor Cage Code 52467
IR Standard Part Number
AHF2815T
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AHF2815T Series
Mechanical Outlines Standard
0.030 dia., 8 pins (0.760) 0.205 (5.21)
8
1 2
0.905 (22.99) 1.105 (28.07) 1.450 (36.83)
0.705 (17.91)
0.505 (12.83)
7
3 4
6
5
0.800 (20.32) 1.120 (28.45)
0.090 R Typ (2.290)
0.260 (6.600) 0.330 (8.380) MAX
Flanged
Pin Designation
Pin # 1 2 3 4 5 6 7 8 Designation Inhibit Input + Dual Output +5V Output Return - Dual Output +5V Output Case Ground Input Return +Input
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AHF2815T Series
Device Screening
Requirement
Temperature Range Element Evaluation Non-Destructive Bond Pull Internal Visual Temperature Cycle Constant Acceleration PIND Burn-In Final Electrical ( Group A ) PDA Seal, Fine and Gross Radiographic External Visual MIL-PRF-38534 2023 2017 1010 2001, Y1 Axis 2020 1015 MIL-PRF-38534 & Specification MIL-PRF-38534 1014 2012 2009 N/A Cond A N/A N/A Cond A, C N/A Yes N/A N/A N/A N/A 25C
MIL-STD-883 Method
No Suffix
N/A N/A
ES
N/A N/A Yes Cond B 500 Gs N/A 48 hrs@hi temp 25C
HB
N/A N/A Yes Cond C 3000 Gs N/A -55C, +25C, +125C N/A Cond A, C N/A Yes
CH
Class H N/A Yes Cond C 3000 Gs N/A -55C, +25C, +125C 10% Cond A, C N/A Yes
-20C to +85C -55C to +125C
-55C to +125C -55C to +125C
160 hrs@125C 160 hrs@125C
Notes:
Best commercial practice Sample tests at low and high temperatures -55C to +105C for AHE, ATO, ATW
Part Numbering
AHF 28 15 T F /CH Model Input Voltage Nominal
28 = 28V
Screening Level
(Please refer to Screening Table)
No Suffix, ES, HB, CH
Package Options
F = Flange Blank = Non-Flanged
Output Voltage
15 = 5V,15V
Output
T = Triple
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. 01/2007
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