ADDC02808PB Analog Devices, Inc., ADDC02808PB Datasheet
ADDC02808PB
Related parts for ADDC02808PB
ADDC02808PB Summary of contents
Page 1
... The unit is designed for high reliability and high performance applications where saving space and/or weight are critical. The ADDC02808PB has been characterized over a wide variety of load conditions. Its transient response has been set to insure output stability over a broad range of load capacitance. For ...
Page 2
... –2– 0.5 V dc, unless otherwise noted; full temperature range is ADDC02808PB Min Typ 52 7. ...
Page 3
... RETURN Output Return. 16 RETURN Output Return. 17 RETURN Output Return –3– ADDC02808PB Function Feedback loop connection for remote sensing output voltage. Must always be connected to output return for proper operation. Feedback loop connection for remote sensing output voltage. Must always be connected to +V for proper operation ...
Page 4
... ADDC02808PB–Typical Performance Curves 100 120 OUTPUT POWER – Watts Figure 1. Efficiency vs. Line and Load at +25 C (Load Pulsewidth –55 –45 –35 –25 –15 – CASE Figure 2 ...
Page 5
... FREQUENCY – Hz Figure 8. Incremental Input Impedance (Magnitude) REV 0.1 0.01 0.001 10 10k 50k Figure 9. Incremental Output Impedance (Magnitude OUT IN 5mV 1mV 0.5mV 100 10k 100k 0 Figure 10. Output Frequency Spectrum –5– ADDC02808PB 100 1k 10k 100k FREQUENCY – FREQUENCY – MHz ...
Page 6
... ADDC02808PB–Typical EMI Curves & Test Setup for 28 V 130 CONDUCTED EMISSIONS CE101 110 90 CE101–1 4.5 AMPS 0.0001 0.001 FREQUENCY – MHz Figure 11. Conducted Emissions, MIL-STD-461D, CE101, +28 V Hot Line 100 W Load 130 CONDUCTED EMISSIONS CE102 110 90 70 LIMIT 28VDC ...
Page 7
... PULSED OUTPUT POWER VS. PULSE LENGTH The maximum specified pulsed output power in the standard configuration of the ADDC02808PB is 200 W. This limit is based on issues of working down to the minimum input volt- age, of providing a reasonable short circuit current limit, and so on. However, this power level assumes that the junction tem- peratures of the converter’ ...
Page 8
... Maintains T 110 Baseplate JMAX TRANSIENT RESPONSE The standard ADDC02808PB is designed to deliver large changes, or pulses, in load current with minimum output volt- age deviation and an ultrafast return to the nominal output voltage. The compensation of the feedback loop is optimized, and output stability is insured, for a broad range of external load ...
Page 9
... ESR 7.9 7.8 7.7 at the expense of . The predicted 7.6 LOAD 7.5 7.4 –200 Figure 24. Predicted Response for 24 A Step Load Change, di/ with Factory Set Internal Compensation Optimized for C –9– ADDC02808PB Typical Settling Time R Deviation (Within 1%) ESR 10 m –4% 125 –2.5% 100 s 2.5 m – – ...
Page 10
... F and R LOAD RESPONSE AT END OF PULSE The previous section describes how the ADDC02808PB con- verter responds to the positive step change in load current that occurs at the beginning of a power pulse. This section will discuss the converter’s response at the end of the power pulse when the load current is abruptly returned to a small value. Figures 26-29 show the converter’ ...
Page 11
... Figures 32 and 33 show the typical source and sink capabilities of the status out- put. Refer to the paragraphs describing Pin 3 (ADJUST) for effect on status trip point 0.2 0.4 0.6 0 Figure 32. Source Capability of Status Output –11– ADDC02808PB 96 95 104 105 1.0 1.2 1.4 1.6 – mA ...
Page 12
... ADDC02808PB 1.0 0.8 0.6 0.4 0.2 0.0 1.0 4.0 7.0 10.0 I – Figure 33. Sink Capability of Status Output Pin AUX Pin 5 is referenced to the input return and provides a semi- regulated voltage supply for miscellaneous system use. The maximum permissible current draw and the voltage varies with the output load of the converter shown in Figure 34 ...
Page 13
... Figure 3 (typical low line dropout vs. load) shows that the converter can work continuously down to and below under reduced load conditions. The ADDC02808PB can be modified to survive, but not work through, the upper limit input voltages defined in MIL-STD- 704A (aircraft) and MIL-STD-1275A (military vehicles). MIL- ...
Page 14
... stated in terms of current limits (e.g., derate maximum rating), NAVMAT also specifies a maximum junction tem- perature of the semiconductor devices in a power supply. The NAVMAT component deratings applicable to the ADDC02808PB are as follows: Resistors 80% voltage derating 50% power derating Capacitors 50% voltage and ripple voltage derating ...
Page 15
... ADDC02808PB dc/dc converter will be different for several reasons. The purpose of this section is to describe the various MIL-STD-461D baseline tests and the ADDC02805SA converter’s corresponding performance and then explain how the EMI performance of the ADDC02808PB will differ from this baseline 100 W Out, Baseline Performance: The ...
Page 16
... ADDC02808PB In almost all systems the output ground of the converter is ultimately connected to the input ground of the system. The parasitic capacitances and inductances in this connection will affect the common-mode voltage and the CE102 measure- ment. In addition, the inductive impedance of this ground connection can cause resonances, thereby affecting the perfor- mance of the common-mode filter in the power supply. In response to these ambiguities, the Analog Devices’ ...
Page 17
... A repetitively pulsed load will cause large input currents at the fundamental frequency (and harmonics) of the pulse waveform. The result of Items 1 and 2 is that the ADDC02808PB con- verter will have higher conducted and radiated emissions in the 1/2 MHz to 10 MHz range. The emissions in this range are dominated by differential currents ...
Page 18
... The peak in the radiated emissions in the 20 MHz–30 MHz range of Figure 14 is dominated by common-mode noise. This common-mode noise emission is changed only slightly between the ADDC02808PB and the ADDC02805SA converters since it does not depend on the power level or the differential input filter. The turns ratio on the transformer has been changed expect the common-mode emissions might be 2– ...
Page 19
... C1 PS2 28RTN 1 2 ADDC02808PB I SHARE NOTE: VALUE DEPENDENT ON SOURCE IMPEDANCE. REFER TO SECTION ON SYSTEM INSTABILITY CONSIDERATIONS. Figure 45. Typical Connections for Paralleling Two Converters –19– ADDC02808PB RLOAD OUT 13 12 +SENSE PS1 +SENSE PS2 RLOAD – ...
Page 20
... The high current pins (10–17) are 40 mil (1.02 mm) diameter; are 99.8% copper; and are plated with gold over nickel. 4. The signal carrying pins (1–9) are 18 mil (0.46 mm) diam- eter; are Kovar; and are plated with gold over nickel. Screening Levels for ADDC02808PB Ruggedized Industrial (TV) MIL-STD-883, TM2017 N/A ...