CP1032
Chopper Regulators
Fig.3 Power Dissipation vs. Ambient
Fig.4 Overcurrent Protection
Temperature
Characteristics (Typical Value)
6
5
4
3
2
40
PD : With infinite heat sink
35
30
25
20
15
10
Shutdown operating
Ta=25°C
VIN=12V
VO=5V
1
0
5
0
−20
0
25
50
75 85
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Ambient temperature Ta (°C)
Note) Oblique line portion:Overheat protection may operate in this area.
Output current IO (A)
Fig.5 Efficiency vs. Input Voltage
Fig.6 Switching Current vs. Output
Saturation Voltage
100
4
VO=12V, IO=1A
Tj=25°C
VO=12V, IO=3A
Tj=25°C
3.5
3
90
80
70
2.5
2
VO=5V, IO=1A
VO=5V, IO=3A
1.5
1
60
50
0.5
0
0
5
10
15
20
25
30
35
40
0
0.25 0.5 0.75
1
1.25 1.5 1.75
2
Input voltage VIN (V)
Output saturation voltage VSAT (V)
Fig.7 Operating Dissipation Current vs.
Fig.8 Reference Voltage Fluctuation vs.
Junction Temperature
Input Voltage
15
1.5
VIN=12V
VO=5V
Tj=25°C
VO=5V
1
IO=3A
10
0.5
0
IO=1A
No load
5
0
−0.5
−1
−1.5
−25
0
5
10
15
20
25
30
35
40
0
25
50
75
100
125
Input voltage VIN (V)
Junction temperature Tj (°C)
* All specs and applications shown above subject to change without prior notice.
1F-5 NO.66 SEC.2 NAN-KAN RD ., LUCHU , TAOYUAN, TAIWAN
Email: server@ceramate.com.tw
Http: www.ceramate.com.tw
Rev 1.1 Aug.31, 2004
Tel:886-3-3214525
Page 6 of 12
Fax:886-3-3521052
CERAMATE [ CERAMATE TECHNICAL ]
