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VTM 48 FH 060 x 020A00
11.0 SINE AMPLITUDE CONVERTER? POINT OF LOAD CONVERSION
The Sine Amplitude Converter? (SAC?) uses a high frequency
resonant tank to move energy from input to output. (The
resonant tank is formed by Cr and leakage inductance Lr in the
power transformer windings as shown in the VTM? Module
Block Diagram. See Section 10). The resonant LC tank,
operated at high frequency, is amplitude modulated as
function of input voltage and output current. A small amount
of capacitance embedded in the input and output stages of
the module is sufficient for full functionality and is key to
achieving power density.
The VTM48FH060T020A00 SAC can be simplified into the
following model:
305 pH
I OUT
R R OUT
L = 5
L IN IN = 3.7 nH
I OUT
OUT
L OUT = 600 pH
V IN IN
C IN
C OUT
+
V
C C IN IN
R R CIN
6.36 m Ω
0.9 nF
I I Q Q
0.050 A
1/8 ? I OUT
+
–
V?I
+
–
781 m Ω
1/8 ? V IN
12.6 m Ω
C
C OUT
R R COUT
20 μ Ω
68 μF
+
V OUT
K
–
Figure 17 — V ? I Chip? module AC model
At no load:
–
R OUT = 0 Ω and I Q = 0 A, Eq. (3) now becomes Eq. (1) and is
essentially load independent. A resistor R is now placed in
V OUT = V IN ? K
(1)
series with V IN as shown in Figure 18.
K represents the “turns ratio” of the SAC.
Rearranging Eq (1):
R
SAC
K K = = 1/32
K=
V OUT
V IN
(2)
IN
Vin
+
–
SAC?
1/32
OUT
Vout
In the presence of load, V OUT is represented by:
Figure 18 — K = 1/32 Sine Amplitude Converter?
V OUT = V IN ? K – I OUT ? R OUT
and I OUT is represented by:
(3)
with series input resistor
The relationship between V IN and V OUT becomes:
I OUT =
I IN – I Q
K
(4)
V OUT = (V IN – I IN ? R) ? K
(5)
R OUT represents the impedance of the SAC, and is a function of
the R DSON of the input and output MOSFETs and the winding
resistance of the power transformer. I Q represents the
Substituting the simplified version of Eq. (4)
(I Q is assumed = 0 A) into Eq. (5) yields:
quiescent current of the SAC control and gate drive circuitry.
V OUT = V IN ? K – I OUT ? R ? K 2
(6)
The use of DC voltage transformation provides additional
interesting attributes. Assuming for the moment that
Rev. 2.3
V?I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
5/2011
Page 11 of 16
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