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B048K060T24 Datasheet, PDF (12/15 Pages) Vicor Corporation – VI Chip - BCM Mus Converter Module | |||
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Application Note (continued)
PRELIMINARY
The thermal resistance of the PCB to the surrounding environment in
proximity to Vâ¢I Chips may be reduced by low profile heat sinks surface
mounted to the PCB.The PCB may also be coupled to a cold plate by low
thermal resistance standoff elements as a means of achieving effective
cooling for an array of Vâ¢I Chips, without a direct interface to their case.
CASE 3âCombined direct convection to the air and conduction to the PCB.
Parallel use of the Vâ¢I Chip internal thermal resistances (including Junction-
to-Case and Junction-to-BGA) in series with external thermal resistances
provides an efficient thermal management strategy as it reduces total
thermal resistance. This may be readily estimated as the parallel network of
two pairs of series configured resistors.
Vâ¢I Chip Bus Converter Module
Vâ¢I Chip Bus Converter Level 1 DC Behavioral Model for 48 V to 6 V, 240 W
IOUT
ROUT
+
5.5 mâ¦
+
1/8 ⢠Iout
Vâ¢I
1/8 ⢠Vin
++
VIN
IQ
47 mA
ââ
K
â
VOUT
â
©
Figure 25âThis model characterizes the DC operation of the Vâ¢I Chip bus converter, including the converter transfer function and its losses. The model enables
estimates or simulations of output voltage as a function of input voltage and output load, as well as total converter power dissipation or heat generation.
Vâ¢I Chip Bus Converter Level 2 Transient Behavioral Model for 48 V to 6 V, 240 W
L IN = 20 nH
+
CIN
VIN
RCIN
1.5 mâ¦
4.0µF
IQ
47 mA
â
1/8 ⢠Iout
IOUT
3.2 nH
Vâ¢I
++
ââ
K
10 mâ¦
1/8 ⢠Vin
ROUT
Lout = 1.1 nH
5.5 mâ¦
COUT
RCOUT
0.15 mâ¦
55.0 µF
+
VOUT
â
©
Figure 26âThis model characterizes the AC operation of the Vâ¢I Chip bus converter including response to output load or input voltage transients or steady state
modulations. The model enables estimates or simulations of input and output voltages under transient conditions, including response to a stepped load with or
without external filtering elements.
vicorpower.com 800-735-6200
Vâ¢I Chip Bus Converter Module
B048K060T24
Rev. 1.0
Page 12 of 15
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