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| 型號： | UPC16318 |
| 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)： | 17/35頁 |
| 文件大小： | 187K |
| 代理商： | UPC16318 |
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User’s Manual G12702EJ8V0UM00
24
5.5 Precautions Related to Low Saturation Types
Since a low saturation type of power supply IC uses a PNP transistor in the output stage, particular care is
needed. In a low input state before the output voltage enters regulation state (such as at startup), a large circuit
current flows because the output stage transistor is saturated.
Depending on the product, the circuit current is
decreased at startup by an on-chip rushing current prevention circuit, but even in this case a relatively large circuit
current flows compared to normal operation (For details, refer to the "Circuit operating current at startup IBIAS(S)" rating
of each product). Thus, care is needed in the following matters.
On startup, be careful of the output capacity of the power supply on the input side and the output impedance,
since a circuit operating current flows in the input superimposed on the load current.
It is not possible to adjust the output voltage by inserting a resistor or the like in the GND. This is because the
circuit operating current increases at startup.
Be sure to connect a low impedance type capacitor to the output to increase stability against abnormal oscillation.
5.6 Thinking on Various Protection Circuits
NEC power supply ICs, which have on-chip overcurrent protection circuits, limiting circuits for securing SOA, and
overheat protection circuits, are very difficult to destroy in their normal operating state.
Nonetheless, you should not design circuits that put too much confidence in these protection circuits. These
protection circuits are for protection against sudden accidents. To the best of your ability, avoid operating protection
circuits for long stretches of time. In particular, be careful using the overheat protection circuit since this is like
operating at a temperature exceeding the absolute maximum rating.
6. POWER SUPPLY IC DATA SHEET APPEARANCE AND DESIGN METHODS
6.1 Absolute Maximum Ratings
This item shows values that must not be exceeded even momentarily under any usage conditions or test
conditions. Moreover, it is a mistake to think that use at the absolute maximum ratings is possible. Design should be
performed so that even in an abnormal state the equipment being considered leaves room for the absolute maximum
ratings.
In addition, it is assumed that GND is the lowest potential in the case of a positive output power supply and that
INPUT is the lowest potential in the case of a negative output power supply (see chapter 2).
6.2 Recommended Operating Conditions
If used under these conditions, it is possible to obtain output voltage precision as expected.
Think of this as a
criterion for selecting a power supply IC.
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