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參數(shù)資料
| 型號： | 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[05/2000] |
| 文件頁數(shù)： | 18/35頁 |
| 文件大?。?/td> | 187K |
| 代理商： | UPC29S78 |
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User’s Manual G12702EJ8V0UM00
25
6.3 Electrical Specifications
NEC guarantees the minimum values and maximum values of electrical characteristics at the time of shipment.
Therefore, whether or not it is possible to satisfy the specifications of the power supply to be designed must be
determined by adequately investigating each rating and condition in each item of the electrical characteristics. Each
item of the electrical characteristics is described below (Since the explanations below are mainly for positive output
power supply ICs, reread them while reversing polarities for negative power supply ICs).
<1> Output voltage VO
This item is the most important rating in using a power supply IC. Pay attention to measurement conditions.
If power supply specifications are within this range of conditions, the expected precision (for example
±5%) is
obtained (see Figure 6-1).
Figure 6-1. Output Voltage Conceptualization (For
PC7805AHF) Guaranteed Range Inside Broken Lines
5.4
5.2
5.0
4.8
50
0
50
100
150
VIN = 10 V
IO = 5 mA
Junction temperature TJ (
°C)
Output
voltage
V
O
(V)
<2> Line regulation REGIN
When the input voltage increases, the output voltage also increases. This item shows how much the output
voltage changes when the input voltage VIN is varied within the measured conditions. As shown in Figure 6-
2, output voltage changes nearly linearly with respect to input voltage. Therefore, it is possible to infer how
much the output voltage will change from the initial period when the initial input voltage is changed to a given
input voltage.
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