SVFA0510S Series
6.3 PROTECTION FEATURES
6.3.1 Input Undervoltage Lockout
The SVFA0510S Series provides input undervoltage lockout protection. For input voltages below the turn-on voltage, the converter will
remain off. When the input voltage exceeds the turn-on voltage, the converter will start. For input voltages below the operating range of
the converter but above the UVLO turn-off voltage, the converter may reach its maximum duty cycle and the output may drop out of
regulation.
6.3.2 Output Soft-Start
The SVFA0510S Series utilizes an output soft-start function to ramp the output in a controlled manner, eliminating output voltage
overshoot and limiting inrush current at turn on. A voltage mode soft-start ensures the output waveform remains consistent regardless
of changes in the load current. The output rise time is approximately 3 ms. The soft-start function is active whether the module is
turned on with an application of input voltage or from release of the INH pin. The turn-on delay time is specified from the application of
input voltage (or release of INH pin) until the output reaches 90% of its final value.
6.3.3 Output Short Circuit Protection
The SVFA0510S Series provides output short circuit protection. When a sustained high peak current is detected, the converter will shut
down and enter a hiccup mode. After a delay, the converter will attempt a soft-start. This sequence will continue until the fault is
removed, allowing the converter to soft-start and resume normal operation.
6.4 THERMAL CONSIDERATIONS
The SVFA0510S is rated for full power operation at 125 °C. Operation above 125 °C is allowed at reduced power. Specifically, the
output power should be derated linearly from full power at 125 °C to half power at 130 °C and to zero power at 135 °C. The operating
temperature of the converter is specified on the baseplate of the converter. The converter is designed to be conduction-cooled, with the
baseplate mounted to a heat sink, chassis, PCB or other thermal surface. The internal power dissipating components are mounted to
the baseplate of the converter and all heat flow is through the baseplate. The lid of the converter does not provide a good thermal path.
The hybrid DC-DC converter contains many semiconductor components. The maximum temperature rise from junction to case is 11 °C
at full load.
Sales Information
Phone:(425) 353-3010
Fax: (425) 353-4030
SVFA0510S - 6.0
Page 7
E-mail: vptsales@vptpower.com
Web: www.vptpower.com