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Quasi-resonant CoolSET design guide
ICE2QRxx65/80x
Design Guide
16
8 August 2011
Figure 9 Schematic of the 12W 5V evalulation board with ICE2QR4780Z
6
Input Power Curves for Quasi Coolset 650V/800V
The purpose of the input power curve is to simplify the selection of the CoolSET
®
device. The curve is a
function of ambient temperature to the input power of the system in which the input filter loss, bridge rectifier
loss and the MOSFET power loss are considered. The only information needed is the required output power,
the input voltage range, the operating ambient temperature and the efficiency of the system. The required
input power can then be calculated as equation (14).
o
in
P
P
(14)
where P
in
: input power, P
o
: output power, η : efficiency
It then simply looks up the closed input power at the required ambient temperature from the input power
curve.
The input power curves for the Quasi Resonant CoolSET family are listed below.
ICE2QR0665: Vin=85Vac~265Vac
ICE2QR0665: Vin=230Vac±15%
Figure 10 Input power curve for ICE2QR0665