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參數(shù)資料
| 型號： | QPO-2LZ-01 |
| 廠商： | Vicor Corporation |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 0K |
| 描述： | IC INTERFACE FILTER |
| 標(biāo)準(zhǔn)包裝： | 20 |
| 系列： | Picor®, QUIETPOWER® |
| 其它名稱： | 1102-1094-5 |
Picor Corporation www.picorpower.com
QPO-2 Data Sheet Rev. 1.6 Page 6 of 11
capacitor connected between the VREF and REFGND pins
the low frequency attenuation from 10 Hz to 10 kHz will
reduce by roughly 10 dB. Review the following transient
considerations below before selecting the operating
headroom. The RHR resistor value is determined by using
the following formula.
where; RHR is headroom setting resistor value,
QPOOUT is the expected voltage on the
QPO’s output,
VHR is the target headroom voltage for the
desired range of attenuation.
To ensure sufficient headroom during transient load
changes, a greater headroom voltage than what would
normally be set based on maximum ripple should be
considered. To provide margin to cover the instantaneous
drop in the converter output and the line drops,
additional headroom will be needed. In the example
shown in Figure 2 an additional 75 mV was included with
the headroom voltage value selected from the graph in
Figure 7 to cover the instantaneous drop in the supply
output during the 10 Amp step as explained below.
In Figure 2, a maximum load of 10 Amps allowed for the
RHR value to be calculated to provide 375 mV of headroom
to avoid exceeding 4 Watts. In this example, based on the
attenuation graph in Figure 7, 300 mV of headroom is the
point of diminishing returns so the maximum attenuation
would be achieved at the fundamental ripple frequency.
To stay within the dynamic range required by the active
loop during a transient, a total of 375 mV was used in the
formula to determine the RHR resistor value. The peak
detector will dynamically add 30 mV (derived from the 60
mV peak to peak input ripple) to the static headroom
setting providing the total dynamic headroom of typically
405 mV with the detector enabled.
The input capacitance to the QPO-2 will provide the
transient load current keeping the QPOOUT at the VREF
voltage until the converter loop responds to regulate the
load. During this time the transient load current capability
can be approximated by the formula below. The
capacitance CIN may be within the power supply that is
used or supplemented by external capacitance.
Consideration of the power supply’s sensitivity to
additional output capacitance and stability must be
understood before additional capacitance is added for
transient performance enhancement.
where; CIN = Input capacitance (assuming low
ESR/ceramic type) at the QPO-2 input,
I = Step load current change,
Tr = Converter response time,
VHR = headroom voltage.
The output voltage drop for a given supply during a
transient load step will be reduced at the output of the
QPO-2, effectively multiplying the CIN capacitance by the
ratio of VIN/VOUT which is typically greater than a
factor of 10.
I =
VHR
* CIN
2Tr
RHR =
QPOOUT
* 2.5 k
VHR +15 mV
-100
-80
-60
-40
-20
0
10
100
1K
10K
100K
1M
3M
Frequency [Hz]
27.4k
Ω (269mV)
31.6k
Ω (229mV)
33.2k
Ω(216mV)
37.4k
Ω (189mV)
Rhr=43.2k
Ω (Vheadroom=159mV)
Ω
dB
Vout=3.3V
Iload=15A
Rslope=100K
Figure 7 – Attenuation curves without slope adjust.
0
-20
-40
-60
-80
-100
10
100
1K
10K
100K
1M
3M
22.1k
Ω (198mV)
23.7k
Ω (173mV)
26.1k
Ω (146mV)
27.4k
Ω (126mV)
Rhr=29.4k
Ω (Vheadroom=103mV)
W
Vout=3.3V
Iload=10A
Rslope=8.2K
dB
Figure 8 – Attenuation Curves Using Slope Adjust Feature
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