BK60C-H ASTEC | Alldatasheet

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Technical Reference Notes (TRN) BK60C-H Series

36 Vdc to 75 Vdc Inputs, 150 W

ASTEC POWER - Andover 1 of 14 REV Description Date Approved PR-A Preliminary Release 4/30/00 PR-B Preliminary Release 9/05/00 PR-C Remove 1.5, 2, 5V unit – misc. updates 3/28/01 KTF TECHNICAL REFERENCE NOTES (TRN) BK60C-H SERIES HIGH EFFICIENCY 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 9. Table 3. Output Specifications

Table 3. Output Specifications (continued) tantalum capacitors) See Figure 10.

Table 4. Isolation Specifications Table 5. General Specifications Table 6. Feature Specifications

Table 6. Feature Specifications (continued)

Figure 1. Typical Input Current vs Input Voltage. Figure 2. 018F Efficiency vs Load Current. Figure 3. 025F Efficiency vs Load Current . Figure 4. 033F Efficiency vs Load Current.

Figure 5. Typical Output Voltage Startup Figure 6. Typical Output Ripple (033F) Vi = Vi,nom, Io = Io,max. Vi = Vi,nom, Io = Io,max . Figure 7. Typical Dynamic Response (033F) Figure 8. Typical Dynamic Response (033F)

Cs offsets possible battery impedance. Measure current as shown above. Figure 9. 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 10. Peak-to-Peak Output Noise Measurement Test Setup.

Technical Reference Notes (TRN) BK60C-H Series ASTEC POWER - Andover 9 of 14 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 off 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 +Sense or –Sense 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 11). The following equation determines the required external resistor value to obtain an adjusted output voltage: Where R adj-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 (Radj-up) the output voltage set point (Vo,adj) increases (see Figure 12). The following equation determines the required external resistor value to obtain an adjusted output voltage: Where Radj-up is the resistance value and %Vo,adj is the percent change in the output voltage. Radj_down .100 ,%Vo adj 2 koh m Radj_up ..Vo ( ) ,100 %Vo adj ,.1.225%Vo adj ,100 .2 %Vo adj ,%Vo adj kohm

Technical Reference Notes (TRN) BK60C-H Series ASTEC POWER - Andover 10 of 14 Figure 11 . Circuit Configuration to Decrease Output Voltage. Figure 12 . Circuit Configuration to Increase Output Voltage. +Vin -Vin Case Enable -Vout +Vout -Sense +Sense Vadj RloadRadj-down +Vin -Vin Case Enable -Vout +Vout -Sense +Sense Vadj Rload Radj-up

A, and maximum ambient temperature of 55 ºC. Determine PD (Figure 16): PD = 13 W. Figure 13. Forced Convection Power Derating

Figure 16. 033F Pwr. Diss. vs Load Current.

Technical Reference Notes (TRN) BK60C-H Series ASTEC POWER - Andover 13 of 14 Outline Drawing Tolerances: x.xx +/- 0.02 in (x.x +/- 0.5mm) x.xxx +/- 0.010 in (x.xx +/- 0.25mm Pin Assignment 1. -Vin 2. Case 3. Enable (on/off) 4. + Vin 5. - Output 6. - Sense 7. Trim 8. + Sense 9. + Output All pins are 0.040 diameter except pins 5 & 9 which are 0.080 diameter.

Table 9. Options