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Application Note AN9959
LCL_PWR_EN (TP6)
VB Secondary Rail (TP1)
VGATE (TP4)
D C-DC_EN (TP2 )
Vout (TP3)
Iout (2A / DIV)
5V / DIV
2ms / DIV
FIGURE 5. ISL6160EVAL2 Vout TURN-OFF
ISL6160EVAL2 Performance
FIGURE 2. ISL6160EVAL2 PHOTOGRAPH
Efficiency
Figure 6 displays the ISL6160EVAL2 efficiency versus load
current. It highlights the efficiency advantages of a switching
IOUT (1A/DIV)
VB INPUT CURRENT (1A/DIV)
regulator at a higher load current. The designed current limit
of this evaluation bd is ~3.5A. The dashed portion of the
curve was collected from a modified evaluation board with
an increased overcurrent protection limit. The curve
indicates maximum efficiency at about 4.5A of output current
and approximately 25W of input power.
VB RAIL (5V/DIV)
VB RAIL 5V/DIV
VPHASE (10V/DIV) (TP9)
90
85
VOUT (5V/DIV) (TP3)
TIME (4 μ s/DIV)
FIGURE 3. ISL6160EVAL2 OPERATIONAL WAVEFORMS
LCL_PWR_EN (TP6 )
80
75
70
65
25W
MEAN CURRENT INTO VB SWITCH * VB
MEAN LOAD CURRENT * VOUT
VGATE (TP4)
1
1.5
2
2.5 3 3.5
4
4.5
5
LOAD CURRENT (A)
FIGURE 6. ISL6160EVAL2 EFFICIENCY vs LOAD CURRENT
VB Secondary Rail (TP1)
D C-DC_EN (TP2 )
Vout (TP3)
ISL6160 related efficiency improvements can only come
from lowering the RDSon of the VB FET (Q3) switch and the
threshold voltage across the sense resistor that invokes
current regulation and shutdown. HIP6006 related efficiency
improvements are explained in the Power Supply Design
Considerations section of this document.
Transient Response
5V / DIV
20ms / DIV
Figure 7 shows a laboratory oscillogram of the
FIGURE 4. ISL6160EVAL2 Vout TURN-ON
ISL6160EVAL2 in response to a 0-3.5A, 250A/ms load
transient. The output voltage responds rapidly and is within
2% of its nominal value in less than 150 μ s.
2
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