Application Note 9706
90
VOUT = 2.8V
2.85V
VOUT
(50mV/DIV)
VIN = 5V
85
COMP
1V/DIV
80
75
VIN = 12V
1.5V
I L
5A/DIV
70
2
4
6 8
10
12
14
0A
LOAD CURRENT (A)
FIGURE 5. HIP6005EVAL3 EFFICIENCY vs LOAD
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.
+5% REGULATION LIMIT
2.15
2.05
TIME (50 μ s/DIV)
FIGURE 7. 0A TO 14A LOAD TRANSIENT RESPONSE
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
1.95
-5% REGULATION LIMIT
± 60mV with the droop function compared to a deviation of
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.
TIME (100 μ s/DIV)
FIGURE 6. HIP6005EVAL3 TRANSIENT RESPONSE TO
INTEL TEST TOOL
TABLE 1. CONTROL LOOP CHARACTERISTICS
The HIP6004/5EVAL3 implements the droop function by
using the average voltage drop across the output inductor.
HIP6004EVAL3
HIP6005EVAL3
IN = 5V
IN = 12V
IN = 5V
IN = 12V
f 0dB
? MARGIN
37kHz
68 o
74kHz
54 o
23kHz
74 o
48kHz
64 o
3
相关PDF资料
HIP6019BEVAL1 EVAL BOARD 1 FOR HIP6019B
HIP6021EVAL1 EVALUATION BOARD HIP6021
HIP6301EVAL2 EVALUATION BOARD HIP6301
HIP6302EVAL1 EVALUATION BOARD HIP6302
HIP6521EVAL1 EVALUATION BOARD HIP6521
HIP6602BCR-T IC DRVR MOSF 2CH SYC BUCK 16-QFN
HIP6603BCBZ IC DRIVER MOSFET SYNC BUCK 8SOIC
HS0005KCU04H EMULATOR E10A-USB SUPERH RISC
相关代理商/技术参数
HIP6005 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor
HIP6005A 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor
HIP6005ACB 制造商:Rochester Electronics LLC 功能描述:- Bulk
HIP6005ACB-T 制造商:Rochester Electronics LLC 功能描述:- Bulk
HIP6005B 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor
HIP6005BCB 制造商:Rochester Electronics LLC 功能描述:PWM CONTROLLER 3.5 TO 1.3V DAC RANGE,20LD SOIC - Bulk
HIP6005BCB WAF 制造商:Harris Corporation 功能描述:
HIP6005BCB-T 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller