ISL6551EVAL1 Intersil, ISL6551EVAL1 Datasheet - Page 28

• Manufacturer Part Number: ISL6551EVAL1
• Description: EVALUATION BOARD ISL6551
• Manufacturer: Intersil

Specifications of ISL6551EVAL1

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Isolated
• Voltage - Output: 3.3V
• Current - Output: 60A
• Voltage - Input: 36 ~ 75V
• Regulator Topology: Buck
• Frequency - Switching: 470kHz
• Board Type: Fully Populated
• Utilized Ic / Part: ISL6551
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

ISL6550. For instance, when R40 or R42 is somehow
shorted by debris or solder, the output voltage would be
programmed up to 5V (the reference of ISL6550) and the
local over-voltage setpoint is also moved up relative to the
output voltage level. In a such situation, the master over-
voltage circuit will over-ride the local over-voltage setpoint
whenever it is greater than 4.19V and protect the processor
or the load from being over-stressed.
FIGURE 41. OVER VOLTAGE (V
FIGURE 40. OVER VOLTAGE (V
OUTPUT VOLTAGE; CHANNEL 2: LATSD
SIGNAL; CHANNEL 3: START SIGNAL
OUTPUT VOLTAGE; CHANNEL 2: LATSD
SIGNAL; CHANNEL 3: START SIGNAL
28
OUT
OUT
=3.63V). CHANNEL 1:
=3.6V). CHANNEL 1:
Application Note 1002
Efficiency Curves
Figures 42 to 44 show the efficiency curves for different
output voltages, and the data are taken at around 400 LFM
airflow with a PAPST-MOTOREN TYP 4600 fan. Each figure
illustrates that the lower the input line is, the higher the
efficiencies at which the converter operates. This is mainly
because the higher the input line is, the lower the duty cycle
is, and the higher the conduction and switching losses of the
primary switches are. Note that the input and output voltages
are measured at TP9 & TP10 and TP4 & TP5, respectively.
Figure 45 shows the full-load efficiencies of the converter for
various input lines. Each curve shows that the higher the
output voltage is, the higher the efficiency is for the same
reasons, as mentioned above.
FIGURE 42. EFFICIENCY CURVES FOR
FIGURE 43. EFFICIENCY CURVES FOR
92
90
88
86
84
82
80
78
76
74
72
70
68
66
64
92
90
88
86
84
82
80
78
76
74
72
70
68
66
64
0 5 10 15 20 25 30 35 40 45 50 55 60
0 5 10 15 20 25 30 35 40 45 50 55 60
V
V
OUT
OUT
=2.64V@~400 LFM
=3.3V @~400 LFM
Iout (A)
Iout (A)
36V
48V
75V
36V
48V
75V