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AK45C048HS018-6 Datasheet(PDF) 11 Page - Astec America, Inc |
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AK45C048HS018-6 Datasheet(HTML) 11 Page - Astec America, Inc |
11 / 17 page Technical Reference Notes (TRN) AK45C 100W Series 36 Vdc to 75 Vdc Inputs, 100 W _____________________________________________________________ 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 (Radj-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 (Radj-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. |
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