Application Notes
CoolConverter™
Galaxy’s proprietary CoolConverter™ provides:
• Patent Pending 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.
Overvoltage Lockout
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.
Voltage
Rising
Voltage
Falling
75
76
77
78
79
80
Input Voltage (V)
Undervoltage Lockout
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 1.0 V
with respect to the –INPUT pin to enable the converter.
For Positive logic, the ON/OFF pin is brought to greater
than 4.0 V with respect to the –INPUT pin. To request
the Positive logic version, add the suffix (P) to the
standard part number. The positive version has a built-
in pull up resistor of approximately 100 kΩ.
Voltage
Rising
Voltage
Falling
30
32
34
36
38
40
Input Voltage (V)
Dorado, Page 3
Part No. 01-002 Rev. 1.0–110802
PRODUCT PREVIEW
GALAXY [ GALAXY POWER, INC. ]
