User manual

CD5.121
CD–Series
DC/DC Converter; 12V, 8A
Jan. 08 / Rev. 1.1 DS-CD5.121-EN / All parameters are specified at 12V, 8A and 24Vdc input at 25°C ambient unless otherwise noted.
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10. FUNCTIONAL DIAGRAM
Fig. 10-1 Functional diagram
+
+
-
-
V
OUT
Input Fuse
&
Input Filter
Output
Voltage
Regulator
Power
Converter
Output
Filter
DC
ok
Output
Over-
Voltage
Protection
Reverse
Polarity
Protection
&
Inrush
Limiter
Chassis
Ground
+
-
Over-
Temperature
Protection
11. RELIABILITY
Input: 24Vdc
Lifetime expectancy min. 173 000h 40°C, 12V, 4A
min. 63 000h 40°C, 12V, 8A
min. 35 000h 40°C, 12V, 9.6A
min. 179 000h 25°C, 12V, 8A
MTBF SN 29500, IEC 61709 1 161 000h 40°C, 12V, 8A
1 904 000h 25°C, 12V, 8A
MTBF MIL HDBK 217F 610 000h 40°C, 12V, 8A, Ground Benign GB40
817 000h 25°C, 12V, 8A, Ground Benign GB25
The Lifetime expectancy shown in the table indicates the operating hours (service life) and is determined by the
lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours.
Lifetime expectancy is calculated according to the capacitor’s manufacturer specification. The prediction model allows
a calculation of up to 15 years from date of shipment.
MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates
reliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily
represent the life of a product.