PI3545-00-LGIZ Datasheet, PDF (33/37 Pages) Vicor Corporation – 36 Vin to 60 Vin Cool-Power ZVS Buck Regulator & LED Driver

PI354x-00
Device
V_IN
I_LOAD
(V)
(A)
C_INPUT
Ceramic
X5R
C_OUTPUT
Ceramic
X5R
PI3542
48
10
5
5 x 2.2 µF
100 V
6 x 100 µF
PI3543
48
10
5
5 x 2.2 µF
100 V
6 x 100 µF
PI3545
48
10
5 x 2.2 µF
5
100 V
6 x 47 µF
PI3546
48
9
5 x 2.2 µF
4.5
100 V
6 x 10 µF
Table 3 — Recommended input and output capacitance
C_INPUT
Ripple
Current
(_IRMS)
0.7
0.8
.88
1.12
C_OUTPUT
Ripple
Current
(I_RMS)
1.32
Input
Ripple
(mVpp)
416
220
464
1.3
230
485
1.37
245
880
1.26
125
Output
Ripple
(mVpp)
47
22
61.6
31
62
32
114
33
Transient
Deviation
(mVpk)
Recovery
Time
(µs)
Load
Step
(A)
(Slew/µs)
-/+80
40
5
(1 A/µs)
-/+90
40
5
(1 A/µs)
-/+150
40
5
(1 A/µs)
-/+300
20
5
(1 A/µs)
Murata Part Number
Description
C3225X7S1H1106M250AB
2.2 µF 100 V 1210 X7R
C3225X7S1H106M250AB
10 µF 50 V 1210 X7R
GRM31CR60J107ME39L
100 µF 6.3 V 1206 X7R
GRM31CR61A476ME15L
47 µF 10 V 1206 X5R
GRM32ER61H106MA12
10 µF 50 V 1210 X7R
Table 4 — Capacitor manufacturer part numbers
Layout Guidelines
To optimize maximum efficiency and low noise performance
from a PI354x-00 design, layout considerations are necessary.
Reducing trace resistance and minimizing high current loop
returns along with proper component placement will
contribute to optimized performance.
A typical buck converter circuit is shown in Figure 68. The
potential areas of high parasitic inductance and resistance
are the circuit return paths, shown as LR below.
V_IN
C_IN
C_OUT
I _NV
C_NV
C_OUT
Figure 69 — Current flow: Q1 closed
When Q1 is on and Q2 is off, the majority of C_IN’s current is
used to satisfy the output load and to recharge the C_OUT
capacitors. When Q1 is off and Q2 is on, the load current is
supplied by the inductor and the C_OUT capacitor as shown in
Figure 70. During this period C_IN is also being recharged by
the V_IN. Minimizing C_IN loop inductance is important to
reduce peak voltage excursions when Q1 turns off. Also, the
difference in area between the C_IN loop and C_OUT loop is vital
to minimize switching and GND noise.
Figure 68 — Typical Buck Regulator
The path between the COUT and CIN capacitors is of
particular importance since the AC currents are flowing
through both of them when Q1 is turned on. Figure 69,
schematically, shows the reduced trace length between input
and output capacitors. The shorter path lessens the effects
that copper trace parasitics can have on the PI354x-00
performance.
Cool-Power^®
Page 33 of 37
Rev 1.3
02/2016
I
NV
C_NV
C_OUT
Figure 70 — Current flow: Q2 closed
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