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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)： | 12/12頁 |
| 文件大小： | 290K |
| 代理商： | QPO-2L |
Picor Corporation www.picorpower.com
QPO-2L Data Sheet Rev. 1.1 Page 9 of 12
Headroom Start-up Clamp Feature
This feature allows for pre-charging the Vref
capacitance to the level just below the steady state
headroom voltage. It reduces the time for the
QPOout to reach the desired regulation voltage and
converter output overshoot that results in the delay
through the QPO filter during start-up. The
following formula can be used to calculate the RCP
resistor value to set the clamp at 90% of the final
output value. To set the clamp voltage to different
percentages of the output substitute the 0.90 with
the desired factor.
The following is a summary of typical configurations
that a user can select for the QPO-2.
o No slope adjust, no peak detect, fixed headroom,
attenuation vs headroom graph in figure 7 apply
o No slope adjust, peak detector enabled, headroom
will increase by the peak of the ripple amplitude
o Slope adjust enabled, no peak detect, headroom
will decrease with the increase in load current
o Slope adjust enabled, peak detector enabled,
headroom will vary with ripple amplitude and load
variations
The attributes of these features have been explained
in this datasheet. The optimum use of them requires
an understanding of the characteristics of the power
supply to be filtered.
Figure 10 - Power dissipation vs. RHR (Headroom voltage) with
150mV of slope adjust.
RCP = 100k* (VQPOIN - 0.90*VQPOOUT)
0.90*VQPOOUT
Iload=10A (VREF Cap=25F)
1% Rhr std. values for VOUT=3.3V
Rsa=8.4K (delta Vhr=150mV from 0.1 to 10A)
14.3 k
16.5 k
18.2 k
21 k
22.6k
24.9 k
-60
-50
-40
-30
-20
-10
0
1
2
3
4
Watts
dB
500 kHz
50 Hz
3.3 V QPO-2 output voltage
27.4 k Headroom resistor
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