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參數(shù)資料
| 型號(hào)： | QPO-2LZ-01 |
| 廠商： | Vicor Corporation |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大?。?/td> | 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 9 of 11
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.
No slope adjust, no peak detect, fixed headroom,
attenuation vs headroom graph in Figure 7 apply
No slope adjust, peak detector enabled, headroom will
increase by the peak of the ripple amplitude
Slope adjust enabled, no peak detect, headroom will
decrease with the increase in load current
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.
RCP =
100k* (VQPOIN - 0.90 * VQPOOUT)
0.90 * VQPOOUT
0.1310
0.0880
0.0655
0.0880
15 places
0.0000
0.1000
0.3000
0.1000
0.3000
0.3970
0.4410
0.4
8
50
0.4
8
50
0.2000
0.0000
0.1000
0.3000
0.4410
0.3970
0.4850
0.0000
0.1000
0.3000
0.3970
0.4850
0.1500
QPO Package Outline
(Top View)
4 places
0.492
0.2560
0.2060
Figure 11 - Recommended PCB receptor patterns. (dimensions in
inches)
QPO IN
QPO OUT
0.4410
Vias to ground plane
Figure 12 - Recommended PCB copper lands for low thermal resistance.
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