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Application Note 9906
Phase-to-Phase Current Sharing
Figures 4 and 5 take the transient response to yet another
level of detail, in order to showcase the phase-to-phase
current matching. As it can be easily observed in either
figure, the phase-to-phase steady-state current matching of
the evaluation board is typically 1A or less. During transient
edge dynamic response, the phase-to-phase current
mismatch is evident, result of the specific timing
relationships that govern the HIP6301’s operation. The
matching appearance of the current waveforms flowing
through each of the converter’s phases suggests equally
matched channel-to-channel power dissipation and thermal
performance.
1.7V>
VCORE
I L2
I L4
excitation. In both figures (4 and 5), the dynamic transient
excitation occurs at time T0. As it may be noticed in Figure 4,
the first-order response of the converter (representing the
bulk of the current step) takes place in a time interval of only
5 μ s to 6 μ s. The converter’s response to the tail end of the
transient (Figure 5) is equally fast; however, in this case, the
current ramp-down of the output inductors is, mainly, only a
function of the inductor value and the output voltage.
One important parameter contributing to an exemplary
phase-to-phase current matching is layout. As it may be
observed in the layout plots included at the end of the
application note, all channels have an identical, tight layout,
with a ground plane exhibiting minimal voids between the
controller and the individual channel blocks.
Circuit Efficiency
Figure 6 shows the laboratory-measured evaluation board
efficiency. Measurements were performed at room
temperature, with approximately 100 linear feet per minute
(100 lfm) air flow.
88
86
84
0A>
I L3
5 μ s/DIV.
dI/dt = 500A/ μ s
82
80
T0
T1
FIGURE 4. HIP6301EVAL2 OUTPUT VOLTAGE AND PHASE
CURRENTS TRANSIENT RESPONSE - LEADING
EDGE (0A - 54A)
78
76
74
72
1.7V>
VCORE
0
5
10
15
20
25
30
35
40
45
50
55 60
OUTPUT CURRENT (A)
FIGURE 6. HIP6301EVAL2 EFFICIENCY (ROOM
TEMPERATURE, 100LFM AIR FLOW)
Output Short-Circuit Protection
I L4
Figure 7 captures the circuit’s response to an output
0A>
I L2
dI/dt = 500A/ μ s
T0
I L3
5 μ s/DIV.
T1
overloading caused by a short-circuit. At time T0, a short-
circuit is applied to the output of the converter. Responding
to the output overload, the circuit ramps up the output
current. At time T1, the current has reached a level high
enough to trip the over-current protection. The converter
shuts down and the output voltage collapses under the
FIGURE 5. HIP6301EVAL2 OUTPUT VOLTAGE AND PHASE
CURRENTS TRANSIENT RESPONSE - FALLING
EDGE (54A - 0A)
An additional important aspect of the transient response
operation is the response speed of the converter. As it can
be seen, it takes around a microsecond for the duty cycle of
one phase to exhibit a visible response to the transient
3
current draw of the output short-circuit.
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