HIP6004EVAL3 Intersil, HIP6004EVAL3 Datasheet - Page 3

• Manufacturer Part Number: HIP6004EVAL3
• Description: EVALUATION BOARD EMBED HIP6004
• Manufacturer: Intersil

Specifications of HIP6004EVAL3

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 1.3 ~ 3.5V
• Current - Output: 14A
• Voltage - Input: 5 ~ 12V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: HIP6004
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Frequency - Switching: -

Transient Response
Figures 6 and 7 show laboratory oscillograms of the
HIP6005EVAL3 which are similar to those shown in Figures
3 and 4 for the HIP6004EVAL3. There are small differences
in the transient responses of the two different evaluation
boards. Since the HIP6005EVAL3 uses a larger output
inductor and identical control loop compensation (R5, R8,
C8, and C9), the closed-loop gain crossover frequency is
lower than for the HIP6004EVAL3. Check the Feedback
Compensation section of either data sheet for details on loop
compensation design. Table 1 details simulated closed-loop
bandwidth and phase margin for both reference boards at
both +5V and +12V input sources.
f
0dB
MARGIN
2.15
2.05
1.95
FIGURE 6. HIP6005EVAL3 TRANSIENT RESPONSE TO
75
70
90
80
85
FIGURE 5. HIP6005EVAL3 EFFICIENCY vs LOAD
TABLE 1. CONTROL LOOP CHARACTERISTICS
VIN = 5V
2
INTEL TEST TOOL
IN = 5V
37kHz
68
VIN = 12V
HIP6004EVAL3
o
4
LOAD CURRENT (A)
IN = 12V
TIME (100 s/DIV)
74kHz
6
54
3
o
-5% REGULATION LIMIT
8
+5% REGULATION LIMIT
IN = 5V
23kHz
74
HIP6005EVAL3
o
10
VOUT = 2.8V
Application Note 9706
IN = 12V
12
48kHz
64
o
14
Output Voltage Droop with Load
Both the HIP6004EVAL3 and HIP6005EVAL3 use a droop
function to maintain output voltage regulation through load
transients with fewer (or less costly) output capacitors. With a
high di/dt load transient typical of the Pentium Pro
microprocessor, the largest deviation of the output voltage is at
the leading edge of the transient. The droop function adds a
voltage change as a function of load that counters the transient
deviation.
Figure 8 illustrates the static-load droop characteristic. With
no-load the output voltage is above the nominal output level.
The output decreases (or droops) as the load increases.
With a dynamic load, the droop function pre-biases the
output voltage to minimize the total deviation. Prior to the
application of load, the output voltage is above the nominal
level and the transient deviation results in an output lower
than the nominal level. Figure 3 illustrates the droop function
performance on the HIP6004EVAL3 converter. The transient
deviation is approximately 110mV. At light load, the output
voltage is about 50mV higher than the nominal output
voltage of 2.05V. At full load, the output voltage is about
60mV lower than nominal. The total deviation is within
over 100mV without this function. Since the voltage
excursions at the transient edges are mainly a function of the
output capacitors, the converter uses fewer capacitors.
The HIP6004/5EVAL3 implements the droop function by
using the average voltage drop across the output inductor.
2.85V
1.5V
60mV with the droop function compared to a deviation of
0A
FIGURE 7. 0A TO 14A LOAD TRANSIENT RESPONSE
1V/DIV
COMP
5A/DIV
VOUT
(50mV/DIV)
I
L
TIME (50 s/DIV)