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參數(shù)資料
| 型號： | QPO-2L |
| 廠商： | Vicor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | QPO-2L Low Voltage Output Ripple Attenuator |
| 中文描述： | QPO - 2公升低電壓輸出紋波衰減 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大小： | 290K |
| 代理商： | QPO-2L |
Picor Corporation www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 8 of 12
Headroom Slope Adjustment
This feature can be used to allow more headroom at
lighter loads inceasing the delta voltage available to
improve
transient
load
capability,
while
approximating constant power dissipation of the
QPO-2 over the full load range. The slope of this
curve is set by the slope adjust resistor RSA. Figure 9
shows the relationship of headroom resistance
versus power dissipation for a load current of 10
Amps. The same data is plotted in Figure 10 with the
slope adjust feature reducing the headroom by
150mV over the load range of 1 to 10A, for a typical
range of RHR values with a 3.3 volt output. The
headroom setting RHR value was selected at the
minimum load condition while enabling the slope
function using an RSA value of 8.2k. This feature is
useful in improving the QPO-2 efficiency when using
switching power supplies that have decreasing ripple
with increasing load current, like Vicor converters.
Figure 8 shows the headroom voltage vs. load with
different headroom resistors with RSA =8.2k.
The slope adjust feature can be effectively disabled,
providing relatively constant headroom versus load,
by using an RSA of 100k. The user can optimize
performance based on the expected variation in
load current and the desired power dissipation
range. The formula below should be used to
calculate the RSA value for the desired headroom
versus current slope. If the peak detector is enabled,
the peak of the ripple will be added back to the
headroom at a given load condition.
where: IOUT = Maximum load current change,
VHR = Change in headroom desired over
the load range,
RSA = Slope adjust resistor value,
Example: For a 5A maximum load and a 150mV
reduction in headroom.
Figures 9 and 10 demonstrate the attenuation versus
power dissipation relationship with different
headroom resistor values with corresponding
increasing power dissipation at a fixed 10A load. The
low frequency attenuation is flat with changing
headroom as indicated by the 50Hz line. The active
attenuation is dependent on the headroom voltage
and correlates to the attenuation curves presented
previously.
Figure 10 shows the increase in attenuation that can
be gained by using the slope adjust feature setting
higher headroom at lower loads while limiting the
power dissipation with reduced headroom at higher
loads staying within the 4 Watt limitation of the
package. As stated previously this will also increase
the transient capability with a load step providing
more delta voltage across the filter at lower loads.
Iload=10A (Vref Cap=25uF) 1% Rhr std. values for VOUT=3.3V
Rsa=100k (delta Vhr=0mV from 0.1 to 10A)
21 k
24.9 k
30.1 k
39.2 k
47.5 k
-60
-50
-40
-30
-20
-10
0
12
34
Watts
500 khz
50 hz
dB
3.3 V QPO-2 output voltage
69.8 k Headroom resistor
Figure 9 - Power dissipation vs. RHR (Headroom voltage)
113 k
Load Current (A)
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A
0V
200mV
400mV
600mV
V
Headroom
Rhr=64.9 k
75 k
82.5 k
124 k
102 k
93.1 k
Figure 8 - Effect of slope adjust on headroom value with
increasing current and RSA = 8.2 k.
RSA = 0.05(V/A) *
Iout
* 2.5 k
Vhr
RSA = 0.05(V/I) *
5 A
* 2.5 k = 4.167 k
0.15 V
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