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SSTW005A0F41Z Datasheet(PDF) 7 Page - Lineage Power Corporation |
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SSTW005A0F41Z Datasheet(HTML) 7 Page - Lineage Power Corporation |
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7 / 15 page  GE Data Sheet SSTW005A0F Barracuda™ Series; DC-DC Converter Power Modules 36-75Vdc Input; 3.3Vdc, 5A, 15W Output March 26, 2013 ©2012 General Electric Company. All rights reserved. Page 7 Feature Description Remote On/Off Two remote on/off options are available. Positive logic turns the module on during a logic high voltage on the on/off pin, and off during a logic low. Negative logic remote on/off, device code suffix “1”, turns the module off during a logic high and on during a logic low. ON/OFF Vin+ Vin- Ion/off Von/off Vout+ TRIM Vout- Figure 10. Circuit configuration for using Remote On/Off Implementation. To turn the power module on and off, the user must supply a switch (open collector or equivalent) to control the voltage (Von/off) between the ON/OFF terminal and the VIN(-) terminal. Logic low is 0V ≤ Von/off ≤ 0.8V. The maximum Ion/off during a logic low is 1mA, the switch should be maintain a logic low level whilst sinking this current. During a logic high, the typical Von/off generated by the module is 2.4V, and the maximum allowable leakage current at Von/off = 2.4V is 25μA. If not using the remote on/off feature: For positive logic, leave the ON/OFF pin open. For negative logic, short the ON/OFF pin to VIN(-). Overcurrent Protection To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting continuously. At the point of current-limit inception, the unit enters hiccup mode. The unit operates normally once the output current is brought back into its specified range. The average output current during hiccup is 10% IO, max. Overtemperature Protection To provide protection under certain fault conditions, the unit is equipped with a thermal shutdown circuit. The unit will shutdown if the thermal reference point Tref (Figure 16), exceeds 125oC (typical), but the thermal shutdown is not intended as a guarantee that the unit will survive temperatures beyond its rating. The module will automatically restart upon cool-down to a safe temperature. Input Undervoltage Lockout At input voltages below the input undervoltage lockout limit, the module operation is disabled. The module will only begin to operate once the input voltage is raised above the undervoltage lockout turn-on threshold, VUV/ON. Once operating, the module will continue to operate until the input voltage is taken below the undervoltage turn-off threshold, VUV/OFF. Over Voltage Protection The output overvoltage protection consists of circuitry that independently monitors the output voltage, and shuts the module down if the output voltage exceeds specified limits. The module shall contain hiccup restart capability. Output Voltage Programming Trimming allows the user to increase or decrease the output voltage set point of the module. This is accomplished by connecting an external resistor between the TRIM pin and either the Vout+ pin or the Vout- pin. Trim Down – Decrease Output Voltage By connecting an external resistor between the TRIM pin and Vout+ pin (Radj-down), the output voltage set point decreases (see figure 11). The following equation determines the external resistor value to obtain an output voltage change from Vo,nom to the desired Vo,adj: H V V G V R adj o nom o adj o down adj ) ( ) 5 . 2 ( , , , Note: Values for G and H are defined in Table 1. Table 1. Trim Constants SSTW series Vout+ TRIM Vout- Radj-down RLOAD Vin+ ON/OFF Vin- Figure 11. Circuit Configuration to Decrease Output Voltage. Trim Up – Increase Output Voltage By connecting an external resistor between the TRIM pin and Vout- pin (Radj-up), the output voltage set point increases (see figure 12). The following equation determines the external resistor value to obtain an output voltage change from Vo,nom to the desired Vo,adj: H K V G R adj o up adj ) 5 . 2 ( 5 . 2 , Note: Values for G, H and K are defined in Table 1. The combination of the output voltage adjustment and the output voltage initial tolerance must not exceed the allowable trim range of 90% to 110% of the nominal output voltage as measured between the Vout+ and Vout- pins. Module G H K SSTW005A0F 5110 2050 0.8 |
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