參數(shù)資料
型號(hào)： QUIETPOWER
廠商： Vicor Corporation
元件分類： DC/DC變換器
英文描述： Output Ripple Attenuation SiP
中文描述： 輸出紋波衰減的SiP
文件頁(yè)數(shù)： 3/8頁(yè)
文件大?。?/td> 144K
代理商： QUIETPOWER
Set your site on PICOR at www.picorpower.com
PRELIMINARY
Vicor Corp.
Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715
QPO-1 Data Sheet
Page 3 of 8
Application Notes
Figure 1
—Typical Configuration using Remote Sensing
Figure 2
—Typical Configuration using Trim Control
R
HR
co
C
QPO
OUT
9
8
S
2
7
SC SET6
CESR 5
R
4
10
17
V
3
G
1
SC
16
PEAK
IN
15
14
18
11
13
QPO
IN
12
GND
19
G
20
QPO-1
R
SA
Load
Cps*
Rps
+
–
{
{
10
IN*
20k**4.7uF**
1W
Module
+ OUT
+ Sense
–
Sense
Module
–
OUT
Trim
C
SC
*
*Optional Component
See Description
**Required only for
engineering samples
Qp*
R
HR
R
SS
C
co
15uF
S
2
SC SET
6
CESR
R
5
V
3
G
1
SC
16
4
GND
19
G
20
QPO-1
R
SA
Load
+
–
IN*
C
SC
*
Module
+ OUT
Trim
Module
–
OUT
QPO
OUT
9
8
7
10
17
PEAK
IN
15
14
18
11
13
QPO
IN
12
{
{
*Optional Component
See Description
20k**4.7uF**
**Required only for
engineering samples
Functional Description
The QPO-1 is an active power filter that provides attenuation
of power supply output PARD. The measured attenuation
performance over frequency is shown in Figure 3 at output
voltage conditions of 3.3 and 28 Vdc. The user can select
and optimize the attenuation versus power dissipation by
setting the headroom voltage of the active loop.
The conditions in Figure 3 were measured with a low current
headroom setting of 375mV with approximately 100mV
peak-to-peak ripple voltage on the input to the QPO-1. The
remote sense circuit configuration was used as shown in
Figure 1 with the peak detector function enabled. Some
power supplies need to sense the output ripple for proper
operation. Cps couples the unfiltered ripple back to the sense
input while Rps provides the DC feedback to the power
supply from the load.
Typical improvement in output noise and transient
performance with a 3.3V converter is shown in Figure 4.
This measured data demonstrates the reduction in noise and
ripple at the output of the QPO-1 versus the source output as
well as the transient capability stepping from 1 to 10A
load current - the maximum current rating. This particular
converter has sufficient output capacitance and response
time to load changes such that no additional capacitance,C
IN,
is needed on the input of the QPO-1 to reach a 10A level and
still maintain the output within ±50mV.
Ch1: QPO
IN
Ch4: QPO
OUT
Ch3: Load Current – 10A peak, pulse width = 400μS
Load Current Static = 1A
Load Current Transient = 9A
Headroom Voltage @ 100mA = 400mV
Attenuation VS Frequency
-70
1.00E+02
-60
-50
-40
-30
-20
-10
0
1.00E+03
1.00E+04
Frequency (Hz)
1.00E+05
1.00E+06
A
28V 10A
3.3V 10A
Figure 3
— Attenuation vs. Frequency
Figure 4 – Transient Response using a Vicor
3.3V Half Brick Converter
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