Advance Data Sheet: MaxetaTM iFA Series
Operating Information:
Output Over-Current Protection: The power modules are equipped with current limit, over-current slow hiccup, and over- current trip fast hiccup mode protection. These three protection mechanisms safeguard the module during output overload and short circuit conditions. During overload conditions, the power modules protect themselves by first entering a current limit operation mode by lowering the module output voltage. The relatively long off duration slow hiccup mode current protection circuit is triggered once the filtered peak switch current reaches the preset value. The modules will operate normally once the output current returns to the specified operating range. The fast over-current trip protection is used to protect against short circuit or switch shoot-through conditions. It is a non-latch fast acting protection circuit. The triggering threshold is normally set quite high.
Over-Current Adjustment: The over- current limit set point cannot be adjusted externally in this design.
Input Over-voltage Protection: The power modules have an internal protection circuit to help guard against application of over voltage at the input of the power module. The modules shut down to protect themselves when the input line voltage exceeds 36Vdc. When the input over- voltage condition is removed, the unit will auto restart and operate normally.
Input Under-voltage Lockout: The power modules also feature an input under voltage lockout circuitry that ensures that the power module is off at low input voltage levels.
The power module will operate normally when the input voltage returns to the specified range.
Output Over-Voltage Protection: The power modules have a protection circuit, independent of the main PWM control loop that reduces the risk of over voltage appearing at the output of the power module during a fault condition. If there is a fault in the main regulation loop, the over voltage
protection circuitry will latch the power module off once it detects the over-voltage condition as specified on the electrical data page. To remove the module from the latched condition, either turn the input power off and back on or reset the remote ON/OFF pins providing that over-voltage conditions have been removed. The reset time of the ON/OFF pins should be 500ms or longer.
Output Over-Voltage Adjustment: The output over-voltage set point cannot be adjusted externally in this design.
Output Under-Voltage Warning: The iFA series power module has internal circuitry to protect against output under-voltage conditions. If an under-voltage condition is present on the output, the module will signal this condition using the “Power Good” pin. There is a delay between the under-voltage condition appearing at the module output and the module switching the “Power Good” pin to high impedance.
Thermal Protection: When the power module exceeds the maximum operating temperature, it will turn-off to protect itself against thermal damage. The module will auto restart as soon as it cools down below the recovery temperature.
Thermal Warning: There is no thermal warning feature for this design.
Remote On/Off: The iFA series power modules have two remote on/off pins, which are isolated from the input side as well as the output side. To control the power module from the input side, the user must supply a switch between the Vin(-) terminal and the – ON/OFF terminal of ON/OFF pins. A 15KΩ external resistor with 0.25W or more power rating is recommended to connect between the Vin(+) terminal and the +ON/OFF terminal. The maximum allowable leakage current of the switch is 50uA. The maximum current sinking capability of the ON/OFF terminal is 5mA or less. The current required to maintain the module ON status must be greater than 1mA.
