EQ2660-9R Datasheet, PDF (15/26 Pages) Power-One – Q Series Data Sheet 66 – 132 Watt DC-DC Converters

Q Series Data Sheet
®
66 – 132 Watt DC-DC Converters
Efficiency
η [%]
90
V_{i nom}
85
V_{i max}
80
V_{i min}
JM082
75
I_o [A]
1
2
3
4
5
Fig. 16a
Efficiency versus input voltage and current per output
(BQ2320)
η [%]
90
V_{i nom}
JM083
V_{i min}
85
V_{i max}
80
75
I_o [A]
1
2
3
4
5
Fig. 16b
Efficiency versus input voltage and current per output
(EQ2320)
Hold-up Time
The Q Series converters provide virtually no hold-up time. If
hold-up time is required, use external output capacitors or
decoupling diodes together with input capacitors of adequate
size.
Formula for additional external input capacitor:
C_{i ext} = –_η–2–••–(^P–_V^o–_ti–•₂–^t_–^h––•_V–1_i –_m^0–_i⁰_n–_2)–
where as:
C_{i ext} = external input capacitance [mF]
P_o = output power [W]
η = efficiency [%]
t _h = hold-up time [ms]
V_{i min} = minimum input voltage [V]
V_ti = threshold level [V]
Thermal Considerations and Protection
If a converter is located upright in quasi-stationary air
(convection cooling) at the indicated maximum ambient
temperature T_{A max} (see table Temperature specifications), and
is operated at its nominal input voltage and output power, the
temperature T_C measured at the Measuring point of case
temperature (see Mechanical Data) will approach T_{C max} after
the warm-up phase. However, the relationship between T_A
and T_C depends heavily on the operating conditions and the
integration into a system. The thermal conditions are
influenced by input voltage, output current, airflow, and
temperature of surrounding components and surfaces. T_{A max}
is therefore, contrary to T_{C max}, an indicative value only.
Caution: The installer must ensure that under all operating
conditions T_C remains within the limits stated in the table
Temperature specifications.
Note: Sufficient forced cooling or an additional heat sink improves
the reliability or allows T_A to be higher than T_{A max}, as long as T_{C max}
is not exceeded. In rack systems without proper thermal
management, the converters must not be packed too densely! In
such cases the use of a 5 or 6 TE front panel is recommended.
A temperature sensor generates an internal inhibit signal,
which disables the outputs, if the case temperature exceeds
T_{C max}. The outputs are automatically re-enabled when the
temperature drops below this limit. This feature is not fitted to
48Q models.
Operating BQ – GQ models with output current beyond I_{o nom}
requires a reduction of the ambient temperature T_A to 50 °C or
forced cooling. When T_{C max} is exceeded, the converter runs
into its thermal protection and switches off; see fig. 17a.
Note: According to the railway standard EN 50155, the con-
verters BQ – GQ can be operated with P_{o nom} continously at T_A =
70 °C, and then for 10 min at T_A = 85 °C without shutdown.
P_o
P_{o max}
05116b
forced
cooling
P_{o nom}
0.75 P_{o nom}
convection
cooling
T_{C max}
Fig. 17a
T_A
T_{A min} 50 60 70 80 90 100 °C
Output power derating versus T_A for BQ – GQ models
Fig. 17b shows the operation of 48Q models beyond T_A =
50 °C with forced cooling.
P_o
P_{o nom}
0.4 P_{o nom}
convection
cooling
05110b
forced
cooling
T_{C max}
T_A
–10 30 40 50 60 70 80 °C
Fig. 17b
Output power derating versus T_A for 48Q models
BCD20011- G Rev AG, 12-Mar-2012
Page 15 of 26
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