ICE2QR1765Z Datasheet, PDF (19/22 Pages) Infineon Technologies AG – Off-Line SMPS Quasi-Resonant PWM Controller with integrated 650V CoolMOS® and startup cell in DIP-7

CoolSET^® - Q1
ICE2QR1765Z
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 26W(30.6W*0.85).
Input Power curve of ICE2QR1765Z
40
35
30
25
20
15
10
5
0
0
25
35 45
55 65
75 85
95 105 115 125
Ambient Temperature[⁰C]
Figure 12 Input Power curve Vin=85~265Vac;Pin=f(T_a)
Input Power curve of ICE2QR1765Z
70
60
50
40
30
20
10
0
0
25
35 45
55 65
75 85
95 105 115 125
Ambient Temperature[⁰C]
Figure 13 Input Power curve Vin=230Vac;Pin=f(T_a)
Version 2.1
19
August 30, 2011