Application Notes
CoolConverter
™
Family
Galaxy’s
C
OOL
C
ONVERTER
™
Family features:
• Patented single-stage power conversion architecture, control,
and magnetic design allow unprecedented power density and
efficiency in an isolated power supply.
• An advanced microcontroller reduces parts count while
adding features, performance, and flexibility in the design.
• Low common-mode noise as a result of lower capacitance in
the transformer compared to planar magnetics and metal
baseplate designs.
• Higher reliability than planar transformer designs that can
suffer from via fatigue from thermal cycling, and metal
baseplate designs with board to board interconnects that are
subject to mechanical stress on electrical connections.
Protection and Control
Valid Input Voltage Range:
The converter measures the input voltage and will
not allow operation outside of the input voltage
specification. As shown by the graphs, hysteresis is
added to both the high and low voltage to prevent
the converter from turning on and off repeatedly
when the voltage is held near either voltage
extreme. At low line this assures the maximum
input current is not exceeded; at high line this
assures the semiconductor devices in the converter
are not damaged by excessive voltage stress.
ON/OFF Logic Option:
The ON/OFF control logic can be either Negative
(standard) or Positive to enable the converter. For
Negative logic, the ON/OFF pin is brought below
1.0V with respect to the –INPUT pin to enable the
converter. The pull-down must be able to sink
100µA. For Positive logic, the ON/OFF pin is
brought to greater than 4.0V with respect to the
–INPUT pin and be limited to less than 10V. To
request the Positive logic version, add the suffix (P)
to the standard part number. The ON/OFF pin has a
built-in pull-up resistor of approximately 100kΩ to
+5V.
48Vin: 30
24Vin: 15
32
16
34
17
36
18
38
19
40
20
48Vin: 70
24Vin: 35
72
36
74
37
76
38
78
39
80
40
Taurus Series, Page 3
WWW.GALAXYPWR.COM
Part No. 99–001 Rev. 5.0–090803
GALAXY [ GALAXY POWER, INC. ]
