AK45C

AK45C ASTEC | Alldatasheet

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Technical Reference Notes (TRN) AK45C 100W Series

36 Vdc to 75 Vdc Inputs, 100 W

ASTEC POWER - Andover 1 of 17 REV Description Date Approved PR-B Preliminary Release 6/1/00 PR-C Revised Graph sizes (Prelim) 10/25/00 PR-D Update Outline Drawing 12/21/00 PR-E New P/N’s / Standoff locations 3/13/01 KTF PR-F Revised Part Numbers Added –M1 Option 3/28/01 PR-G Update Various Specifications 4-5-01 KTF TECHNICAL REFERENCE NOTED (TRN) AK45C 100 WATT SERIES DC-DC CONVERTER ASTEC POWER ANDOVER, MA

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. to absolute maximum ratings for extended periods can adversely affect device reliability. Table 1. Absolute Maximum Ratings Table 2. Input Specifications impedance: TA = 25 ºC.) See Figure 10. CAUTION: This power module is not internally fused. An input line fuse must always be used.

Table 3. Output Specifications tantalum capacitors) See Figure 11.

the maximum overshoot may exceed 5%. Table 4. Isolation Specifications Table 5. General Specifications

Table 6. Feature Specifications

Figure 1. Typical Input Current vs Input Voltage.

Figure 2. 018S, Efficiency vs Load Current. Figure 3. 025S Efficiency vs Load Current.

Figure 4. 033S Efficiency vs Load Current. Figure 5. 050S Efficiency vs Load Current.

Figure 6. Typical Output Voltage Startup Figure 7. Typical Output Ripple Vi = Vi,nom, Io = Io,max. Vi = Vi,nom, Io = Io,max. Figure 8. Typical Dynamic Response Figure 9. Typical Dynamic Response

Cs offsets possible battery impedance. Measure current as shown above. Figure 10. Input Reflected-ripple Test Setup. using a BNC socket. Position the load between 51 mm and 76 mm (2 in. and 3 in.) from module. Figure 11. Peak-to-Peak Output Noise Measurement Test Setup.

Technical Reference Notes (TRN) AK45C 100W Series ASTEC POWER - Andover 11 of 17 Feature Descriptions Output Overvoltage Clamp The output overvoltage clamp consists of a separate control loop, independent of the primary control loop. This control loop has a higher voltage setpoint than the primary loop. In a fault condition the converter goes into “Hiccup Mode”, and the output overvoltage clamp ensures that the output voltage does not exceed Vo,clamp,max. This secondary control loop provides a redundant voltage-control that reduces the risk of output overvoltage. Output Current Protection To provide protection in an output overload or short circuit condition, the converter is equipped with current limiting circuitry and can endure the fault condition for an unlimited duration. At the point of current-limit inception, the converter goes into “Hiccup Mode”, causing the output current to be limited both in peak and duration. The converter operates normally once the output current is brought back into its specified range. Enable (Optional) Two enable option are available. Positive Logic Enable, no suffix, and Negative Logic Enable, suffix “N”. Positive Logic Enable turns the converter on during a logic-high voltage on the enable pin, and off during a logic-low. Negative Logic Enable turns the converter of during a logic-high and on during a logic-low. Output Voltage Adjustment Output voltage adjustment is accomplished by connecting an external resistor between the Vadj Pin and either the +Vout or –Vout Pins. With an external resistor between the Vadj Pin and -Sense Pin (R adj-down) the output voltage set point (Vo,adj) decreases (see Figure 12). The following equation determines the required external resistor value to obtain an adjusted output voltage: Radj_down .510 ,%Vo adj 10.2 kohm Where Radj-down is the resistance value and %Vo,adj is the percent change in the output voltage. With an external resistor between the Vadj Pin and +Sense Pin (R adj-up) the output voltage set point (Vo,adj) increases (see Figure 13). The following equation determines the required external resistor value to obtain an adjusted output voltage: Radj_up ..5.1Vo( ),100 %Vo adj ,.1.225%Vo adj 510 ,%Vo adj 10.2 kohm Where Radj-up is the resistance value and %Vo,adj is the percent change in the output voltage.

Figure 12. Circuit Configuration to Decrease Output Voltage. Figure 13. Circuit Configuration to Increase Output Voltage.

and maximum ambient temperature of 50 ºC. Determine PD (Figure 17): PD = ~8 W. Figure 14. Forced Convection Power Derating

Figure 15. 018S Pwr. Diss. vs Load Current. Figure 16. 025S Pwr. Diss. vs Load Current.

Figure 17. 033S Pwr. Diss. vs Load Current. Figure 18. 050S Pwr. Diss. Vs. Load Current

Technical Reference Notes (TRN) AK45C 100W Series ASTEC POWER - Andover 16 of 17 Outline Drawing Dimensions are in inches (millimeters) Tolerances: x.xx ± 0.02 in (± 0.5mm) x.xxx ± 0.010 in (± 0.25mm) Pin Assignment 1. -Vin 2. No Pin 3. Enable (on/off) 4. No pin 5. +Vin 6. - Output 7. - Sense 8. Trim 9. + Sense 10. + Output View From Pin Side All pins are 0.040 diameter except pins 6 & 10 which are 0.060 diameter.

Table 8. Part Numbers Table 9. Options may be observed until complete drying has occurred.