參數(shù)資料
型號(hào)： UPC29S78
英文描述： Useage of Three-Terminal Regulators | User＇s Manual[05/2000]
中文描述： 使用三端穩(wěn)壓器|用戶手冊(cè)[05/2000]
文件頁(yè)數(shù)： 21/35頁(yè)
文件大?。?/td> 187K
代理商： UPC29S78
User’s Manual G12702EJ8V0UM00
28
<8> Peak output current IOpeak
This is the current at which the overcurrent protection circuit operates. It is defined as the output current
when the output voltage is lowered by 2% from its initial value.
As described in chapter 3, the overcurrent protection circuit operates together with the stable operation area.
Moreover, note that IOpeak decreases as temperature increases (negative temperature characteristic). Figure
6-4 shows the IOpeak-VIN-VO characteristics of the
PC7800A Series. For a nonlinear load such as a motor or
lamp, select a power supply IC that has sufficient leeway (50% or less of normal characteristic graph).
<9> Output short circuit current IOshort
This is the current that flows when output is short-circuited. Since most NEC power supply ICs have an on-
chip limiting circuit for securing SOA, the following relation holds.
IOshort < IOpeak
Like IOpeak, IOshort displays a negative temperature characteristic.
Refer to Figure 6-4 for temperature
characteristics of the output short circuit current and changes with respect to input voltage.
Figure 6-4. Example of IOpeak Characteristics (
PC7800A Series)
3.0
2.5
2.0
1.5
1.0
0.5
IOpeak- (VIN
VO) characteristic
Voltage difference between input and output VIN
VO (V)
Peak
output
current
I
Opeak
(A)
T
J
= 0°C
125°C
75°C 25°C
0
5
10
15
20
25
30
35
6.4 Design Methods
(A) Input circuit design
Determine the capacity of a smoothing capacitor of an input circuit using an O.H. Shade graph or simulator
so that the minimum value of the input voltage is not lower than the measurement conditions of output
voltage.
At this time, connect a film capacitor between input and GND of the power supply IC separate from the
smoothing capacitor to prevent abnormal oscillation (refer to the data sheet of each product type for capacitor
values).
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