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DATA SHEET
4.3
THERMAL DERATING
Load current vs. ambient temperature and airflow rates are given in Figure 1. Ambient temperature was varied between 25° C
and 85° C, with airflow rates from 30 to 500 LFM (0.15 to 2.5m/s).
For each set of conditions, the maximum load current was defined as the lowest of:
(i) The output current at which any FET junction temperature does not exceed a maximum specified temperature of 125° C as
indicated by the thermographic image, or
(ii) The temperature of the transformer does not exceed 125° C, or
(iii) The nominal rating of the converter.
During normal operation, derating curves with maximum FET temperature less or equal to 125° C should not be exceeded.
Temperature at thermocouple locations TC1 and TC2 shown in Fig. H should not exceed 100° C and 125° C respectively, in
order to operate inside the derating curves.
Fig. H: Locations of the thermocouple for thermal testing.
4.4
EFFICIENCY
Figure 2 shows the efficiency vs. load current plot for ambient temperature of 25oC, airflow rate of 300 LFM (1.5 m/s) with
vertical mounting and input voltages of 36V, 48V, and 72V. Also, a plot of efficiency vs. load current, as a function of ambient
temperature with Vin=48V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Figure 3.
4.5
POWER DISSIPATION
Figure 4 shows the power dissipation vs. load current plot for Ta = 25oC, airflow rate of 300 LFM (1.5 m/s) with vertical
mounting and input voltages of 36V, 48V, and 72V. Also, a plot of power dissipation vs. load current, as a function of ambient
temperature with Vin=48V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Figure 5.
4.6
STARTUP
Output voltage waveforms during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are
shown without and with external load capacitance in Figure 6 and Figure 7, respectively.
4.7
RIPPLE AND NOISE
Figure 10 shows the output voltage ripple waveform, measured at full rated load current with a 10μ F tantalum and 1μ F
ceramic capacitor across the output. Note that all output voltage waveforms are measured across a 1μ F ceramic capacitor.
The input reflected-ripple current waveforms are obtained using the test setup shown in Figure 11.
ZD-02084_1.2_October-30-2013
9
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