TOP245P_1 POWERINT [Power Integrations, Inc.], TOP245P_1 Datasheet - Page 18

• Manufacturer Part Number: TOP245P_1
• Description: Title 32W (47W peak) Multiple Output supply
• Manufacturer: POWERINT [Power Integrations, Inc.]

DER-19
10 Thermal Performance
At full continuous output power, the temperature of key components was monitored using
thermocouples. In a 25°C ambient, Figure 11 gives the resulting temperature profiles.
All key components are operating well within specified temperature ranges and this
design would support operation in ambient levels up to 50°C.
11 Waveforms
11.1 Drain Voltage and Current, Normal Operation
Figure 12 - 195 V
Lower: I
div
DRAIN
100
Power Integrations, Inc.
Tel: [phone] Fax: [phone]
www.powerint.com
, 0.5 A / div Upper: V
90
80
70
60
50
40
30
20
10
0
180
Figure 11 - Key Component Temperature Rise variation with Line Voltage
AC
, Full Continuous Load
200
TOP245P Multiple Output Set Top Box
DRAIN
, 200 V, 2 µs /
Line Voltage (Vrms)
220
240
Figure 13 - 265 VAC, Full Continuous Load
Lower: I
DRAIN
260
, 0.5 A / div Upper: V
280
DRAIN
TOP245P
Transformer
3V3 Diode
5V Diode
Ambient
March 30, 2004
Page 18 of 25
, 200 V / div