Chopper Regulators
Fig.10 Oscillation Frequency Fluctuation vs.
Junction Temperature
5
VIN=12V
4
Vo=5V
3
2
1
0
–1
–2
–3
–4
–5
–25
0 25 50 75 100 125
Junction temperature Tj (˚C)
Fig.12 Threshold Voltage vs. Junction
Temperature
4.5
VIN=12V
4
VTHH
3.5
3
VTHL
2.5
2
1.5
VTH(ON)
1
0.5
–50 –25 0 25 50 75 100 125
Junction temperature Tj (˚C)
Fig.14 Power Dissipation vs. Ambient
Temperature (Typical Value)
3
Cu area 740mm2
2
Cu area 180mm2
Cu area 100mm2
Cu area 70mm2
1
Cu area 36mm2
0
–20
0 20 40 60 80 100
Ambient temperature Ta (˚C)
PQ1CZ1
Fig.11 Overcurrent Detecting Level
Fluctuation vs. Junction Temperature
15
10
5
0
–5
–10
–15
–25
0 25 50 75 100 125
Junction temperature Tj (˚C)
Fig.13 Operating Dissipation Current vs.
Input Voltage
10
Tj=25˚C
Vo=5V
9
Io=0.2A
8
Io=1A
7
No load
6
5
0
10
20
30
40
Input voltage VIN (V)
PWB
PWB
Cu
Material : Glass-cloth epoxy resin
Size
: 50 X 50 X 1.6mm
Cu thickness : 35µm