参数资料
| 型号： | PSS5A12-7 |
| 厂商： | Power-One |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | SWITCHING REGULATOR 61.2W 5.1V |
| 标准包装： | 1 |
| 系列： | * |
PSK, PSS Series Data Sheet
?
Thermal Considerations and Protection
When a switching regulator is located in free, quasi-stationary
air (convection cooling) at a temperature T A max and is operated
at its nominal output current I o nom , the case temperature T C
can rise over T C max after the warm-up phase. T C is measured
at the measuring point of case temperature; see Mechanical
Data .
Under practical operating conditions, the ambient temperature
Positive Switching Regulators
sink, forced cooling, etc.) are taken to ensure that the case
temperature T C does not exceed its maximum value.
The regulater is protected by an internal temperature sensor,
which inhibits the output above T C max . The output auto-
matically recovers, when the temperature drops below T C max .
I o / I o nom
T A may exceed T A max , provided that additional measures (heat
I o / I o nom
1.0
0.9
0.8
05031a
forced
cooling
1.0
05032a
0.7
0.6
convection cooling
T C max
0.9
0.5
0.8
forced
0.4
0.7
0.6
0.5
convection cooling
cooling
T C max
0.3
0.2
0.1
0.4
0.3
0
T A min
50
60
70
80
90
°C
T A
0.2
0.1
0
T A min
40
50
60
70
80 °C
T A
Fig. 5b
Output current derating versus temp. (models -7 or -9)
Fig. 5a
Output current derating versus temperature (models -2)
Auxiliary Functions
I inh [mA]
Inhibit (Remote On / Off)
The inhibit input allows to enable or disable the output with a
control signal. In systems with several regulations, this feature
can be used to control the activation sequence of the
5
4
3
06034a
Table 5: Inhibit characteristics
2
1
Output on
Output off
Characteristics
Conditions
min typ max Unit
0
–40
–20
0
20
40
V
V inh
V o = off
V inh Inhibit input voltage V o = on V i min – V i max
T C min – T C max
–50
+2.4
+0.8
+50
V
Fig. 7
Specification of the inhibit signal (typical)
t r
t f
Switch-on time
Switch-off time
V i = V i nom
R L = V o nom / I o nom
130
25
ms
V o / V o nom
1
06001
I i inh Input current when inhibited V i = V i nom
25
mA
Vi+
Gi–
06009a
Vo+
i
Go–
I inh
V inh
0.1
0
Inhibit
1
0
t r
t f
t
t
Fig. 6
Specification of the inhibit signal (typical)
Fig. 8
Output response as a function of the inhibit signal
BCD20029-G Rev AB, 12-Aug-2013
MELCHER
The Power Partners.
Page 10 of 20
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