ICE2QR0665_10 Datasheet, PDF (19/21 Pages) Infineon Technologies AG – Off-Line SMPS Quasi-Resonant PWM Controller

CoolSET^® - Q1
ICE2QR0665
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 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 42.5W(50W*0.85).
70
60
50
40
30
20
10
0
0
25
35
45
55
65
75
85
95
105 115 125
Amb ient T em p eratu re[⁰C ]
Figure 12 Input Power curve Vin=85~265Vac;Pin=f(T_a)
120
100
80
60
40
20
0
0
25
35
45
55
65
75
85
95
105 115 125
Am bient Tem p erature[⁰C ]
Figure 13 Input Power curve Vin=230Vac;Pin=f(T_a)
Version 2.3
19
April 27, 2010