CP1032
Chopper Regulators
Fig.3 Power Dissipation vs. Ambient
Temperature
40
35
P
D
: With infinite heat sink
Fig.4 Overcurrent Protection
Characteristics (Typical Value)
6
5
Output voltage V
O
(V)
Power dissipation P
D
(W)
30
25
20
15
10
5
0
−20
0
25
50
75 85
4
Shutdown operating
3
2
T
a
=25°C
V
IN
=12V
V
O
=5V
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
1
0
Ambient temperature T
a
(°C)
Note) Oblique line portion:Overheat protection may operate in this area.
Output current I
O
(A)
Fig.5 Efficiency vs. Input Voltage
100
T
j
=25°C
90
V
O
=12V,
I
O
=3A
V
O
=12V,
I
O
=1A
Fig.6 Switching Current vs. Output
Saturation Voltage
4
3.5
Switching current I
SW
(A)
T
j
=25°C
3
2.5
2
1.5
1
0.5
Efficiency
η
(%)
80
V
O
=5V,
I
O
=1A
70
V
O
=5V,
I
O
=3A
60
50
0
5
10
15
20
25
30
35
40
Input voltage V
IN
(V)
0
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
Output saturation voltage V
SAT
(V)
Fig.7 Operating Dissipation Current vs.
Input Voltage
15
Fig.8 Reference Voltage Fluctuation vs.
Junction Temperature
1.5
V
IN
=12V
V
O
=5V
Operating disspation current I
Q'
(mA)
I
O
=3A
10
Reference voltage fluctuation (%)
40
T
j
=25°C
V
O
=5V
1
0.5
0
−0.5
−1
−1.5
−25
No load
I
O
=1A
5
0
0
5
10
15
20
25
30
35
Input voltage V
IN
(V)
0
25
50
75
100
125
Junction temperature T
j
(°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
Tel:886-3-3214525
Http: www.ceramate.com.tw
Page
6
of 12
Rev 1.1 Aug.31, 2004
Fax:886-3-3521052
CERAMATE [ CERAMATE TECHNICAL ]
