ICE2QR4765_12 Datasheet, PDF (19/22 Pages) Infineon Technologies AG – Off-Line SMPS Quasi-Resonant PWM Controller with integrated 650V Startup Cell/Depletion CoolMOS In DIP-8

CoolSET^® - Q1
ICE2QR4765
Input power curve
6 Input power curve
Two input power curves gives typical input power versus ambient temperature are showed below;
Vin=85~265Vac(Figure 12) and Vin=230Vac(Figure 13). The curves are derived based on a typical
discontinuous mode flyback model which considers either 50% duty ratio or 115V maximum secondary to primary
reflected voltage(high priority). The calculation is based on no copper area as heatsink for the device. The input
power already includes power loss at input comman mode choke and bridge rectifier and the CooLMOS. The
device saturation current(I_{D_plus}@T_j=125°C) is also considered.
To estimate the out power of the device, it is simply multiplying the input power at a particulary ambient
temperature with the estimated efficiency for the application. For example, a wide range input voltage(Figure 12),
operating temperature is 50 °C, estimated efficiency is 85%,the output power is 16.2W(19W*0.85).
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Am bient Tem perature[⁰C]
Figure 12 Input Power curve Vin=85~265Vac;Pin=f(T_a)
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Figure 13 Input Power curve Vin=230Vac;Pin=f(T_a)
Version 2.3
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November 14, 2012