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參數(shù)資料
| 型號： | MC78BC43NTR |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Micropower Voltage Regulator |
| 中文描述： | 4.3 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO5 |
| 封裝： | PLASTIC, SOT-23, 5 PIN |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 60K |
| 代理商： | MC78BC43NTR |
MC78BC00 Series
http://onsemi.com
5
APPLICATIONS INFORMATION
Introduction
The MC78BC00 series of micropower voltage regulators
are specifically designed for ultra-low dropout voltage and
an output current which ranges from several tens of mA to
several hundreds of mA making them ideal for
battery-powered equipment. These regulators also have a
chip enable function which minimizes supply current in
stand-by mode. An input bypass capacitor is recommended
if the regulator is located an appreciable distance (
≥
4
inches) from the input voltage source. These regulators
require a 10 F capacitance between the output terminal and
ground for stability. Most types of aluminum, tantalum or
multilayer ceramic will perform adequately. Solid tantalums
or other appropriate capacitors are recommended for
operation below 25
°
C. The bypass capacitors should be
mounted with the shortest possible leads or track lengths
directly across the regulator input and output terminals.
With economical electrolytic capacitors, cold temperature
operation can pose a serious stability problem. As the
electrolyte freezes, around -30
°
C, the capacitance will
decrease and the equivalent series resistance (ESR) will
increase drastically, causing the circuit to oscillate. Quality
electrolytic capacitors with extended temperature ranges of
-40
°
to +85
°
C are readily available. Solid tantalum
capacitors may be the better choice if small size is a
requirement. However, a maximum ESR limit of 3.0 must
be observed over temperature to maintain stability.
Figure 9. Typical Operation
Out
External PNP Transistor
V
O
Ext
R
A
R
B
Gnd
10 F
V
in
V
ref
5
1
2
In
3
CE
Error
Amplifier
4
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