V048K015T80 Datasheet, PDF (7/20 Pages) Vicor Corporation – VI Chip - VTM Voltage Transformation Module

Pin/Control Functions
+IN/-IN DC VOLTAGE PORTS
The VTM input should not exceed the high end of the range
specified. Be aware of this limit in applications where the VTM
is being driven above its nominal output voltage. An internal
over/under voltage lock-out function prevents operation outside
of the specified input range. The VTM will turn on when the
input voltage rises above the under voltage lock-out specified.
If the input voltage exceeds the over voltage lock-out, the VTM
will shutdown until the over voltage fault clears. The VTM
does not have internal input reverse polarity protection. Adding
a properly sized diode in series with the positive input or a
fused reverse-shunt diode will provide reverse polarity protection.
A minimum 8 µF Aluminum Electrolytic capacitor should be
applied at the input of the VTM. Additional capacitance, e.g.
100 µF, may be added to enhance dynamic performance or to
compensate for high source impedance.
+Out
-Out
+Out
-Out
43
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
W
Y
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
21
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
W
Y
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
+In
Temp.
Monitor
Signal
Ground
Primary
Control
-In
Bottom View
SG – Signal Ground
Figure 15—VTM BGA configuration
The Signal Ground (SG) pin provides a Kelvin return for the
P ^{R E L I M I N A RY Primary Control (PC) and Temperature Monitor (TM) ports.}
Even though the SG pin is referenced to the –IN of the VTM, it
should not be used as an additional –IN connection.
PC – Primary Control
The Primary Control (PC) pin is a multifunction pin for
controlling the VTM as follows:
Enable/Disable – If the PC is left floating or is pulled to
logic HI, the VTM output is enabled. To disable the output,
the PC pin must be pulled lower than 2.4 V, referenced to
SG. Optocouplers, open collector transistors or relays can
be used to control the PC pin. The PC port should not be
toggled at a rate higher than 1 Hz.
Signal
Name
+In
–In
TM
SG
PC
+Out
–Out
BGA
Designation
A1-L1, A2-L2
AA1-AL1, AA2-AL2
P1, P2
T1, T2
V1, V2
A3-G3, A4-G4,
U3-AC3, U4-AC4
J3-R3, J4-R4,
AE3-AL3, AE4-AL4
+OUT/-OUT DC Voltage Output Ports
The output (+OUT) and output return (-OUT) are through two
sets of contact locations. The respective +OUT and –OUT
groups must be connected in parallel with as low an
Primary Auxiliary Supply – The PC port can source up to
2.4 mA at 5 Vdc.
interconnect resistance as possible. Within the specified input
voltage range, the Level 1 DC behavioral model shown in
Figure 27 defines the output voltage of the VTM. The current
Alarm – The VTM contains watchdog circuitry that
source capability of the VTM is shown in the specification table.
monitors output overload, input over voltage, input under
voltage, or excessive internal temperature. In response to
any of these abnormal conditions the PC port will toggle as
shown in Figure 14.
To take full advantage of the VTM, the user should note the
low output impedance of the device as shown in Figure 9.
The low output impedance provides fast transient response
without the need for bulk POL capacitance. Limited-life
TM – Temperature Monitor
electrolytic capacitors required with conventional converters
can be reduced or even eliminated, saving cost and valuable
The Temperature Monitor (TM) provides a linear output
board real estate.
proportional to the internal temperature of the VTM. At 300ºK
(+27ºC) the TM output is 3.0 V and varies 10 mV/ºC. TM
accuracy is +/-5ºC if the SG pin is used as the ground return of
the TM signal. This feature is useful for validating the thermal
design of the system as well as monitoring the VTM
temperature in the final application.
45 ^{Vicor Corporation Tel: [phone] vicorpower.com}
V•I Chip Voltage Transformation Module Rev. 1.6
Page 7 of 20