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DATA SHEET
Fig. D: Configuration for decreasing output voltage.
Vin (+)
SQE48 Converter
Vout (+)
(Top View)
SENSE (+)
Vin
ON/OFF
TRIM
R T-DECR
Rload
SENSE (-)
Vin (-)
Vout (-)
Trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could
cause unwanted triggering of the output overvoltage protection (OVP) circuit. The designer should ensure that the difference
between the voltages across the converter’s output pins and its sense pins does not exceed 10% of V OUT ( NOM ), or:
[V OUT ( ? ) ? V OUT ( ? )] ? [V SENSE ( ? ) ? V SENSE ( ? )] ? V O - NOM X 10% [V]
This equation is applicable for any condition of output sensing and/or output trim.
3
3.1
PROTECTION FEATURES
INPUT UNDERVOLTAGE LOCKOUT
Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops below a
pre-determined voltage.
The input voltage must be typically 34V for the converter to turn on. Once the converter has been turned on, it will shut off
when the input voltage drops typically below 33V. This feature is beneficial in preventing deep discharging of batteries used
in telecom applications.
3.2
OUTPUT OVERCURRENT PROTECTION (OCP)
The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the con-
verter will switch to constant current operation and thereby begin to reduce output voltage.
If the converter is equipped with the special OCP version designated by the suffix K in the part number, the converter will
shut down in approximately 15ms after entering the constant current mode of operation. The standard version (suffix 0) will
continue operating in the constant current mode until the output voltage drops below 60% at which point the converter will
shut down as shown in Figure 14.
Once the converter has shut down, it will attempt to restart nominally every 200 ms with a typical 3-5% duty cycle as shown
in Figure 15. The attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the
output voltage rises above 40-50% of its nominal value.
Once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and con-
tinues normal operation.
3.3
OUTPUT OVERVOLTAGE PROTECTION (OVP)
The converter will shut down if the output voltage across Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of the
OVP circuitry. The OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the
converter has shut down, it will attempt to restart every 200ms until the OVP condition is removed.
3.4
OVERTEMPERATURE PROTECTION (OTP)
The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation out-
side the thermal derating curves, or operation in abnormal conditions such as system fan failure. Converter with the non-
latching option will automatically restart after it has cooled to a safe operating temperature.
SQE48T40015 DC-DC Converter
6
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