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參數(shù)資料
| 型號： | XC62EP5001ML |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Boosting Voltage Regulators |
| 中文描述： | 提高電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 191K |
| 代理商： | XC62EP5001ML |
353
3
G
Standard Circuit
G
Functional Description
Output voltage (V
OUT
) can be fixed by revising the external transistor's base current. This can be done by comparing the detected voltage level
and the set voltage power supply level.
With the XC62EP (CE negative voltage), if a voltage above the CE pin's "H" level is applied, the IC will enter stand-by mode where the base and
differential amplifier's currents are regulated.
G
Special Note
1. Protection Circuit
The built-in protect circuit is to protect the IC only. Therefore to prevent output shorts and overshoot current through the transistor, use of a
resistor R
B
or an overshoot current protection circuit is recommended.
Care should also be taken with the transistor's power dissipation.
G
Suggestions for External Components
1. PNP Transistor
The selection of a transistor should take into account output current, input voltage and power dissipation for each specific application. It is
recommended that a transistor that has a low output saturated voltage (V
CE
) and high h
FE
characteristics be used.
2. R
B
Resistor
Although the IC unit is protected by a base current remitter circuit, it is recommended that a resistor (R
B
) be connected between the
transistor's base and the IC's EXT pin to protect the transistor.
Required output current can be calculated using the following equation although characteristic variations and conditions of use should be
carefully checked before use. The following equation also indicates the conditions needed to obtain I
OUT
(max.) at V
IN
(min.). However, the
larger the input current, the larger the output current (I
OUT
) that can be obtained.
V
IN
(min)-1.2(V) 0.7(V) I
OUT
(max)
R
B
R
BE
h
FE
3. R
BE
Resistor, C
L
Capacitor
To prevent oscillation due to output load variation, use of a phase compensation capacitor C
L
is recommended. Please use a Tantalum
capacitor of at least 10
μ
F. Please also use an R
BE
resistor of less than 47k
.
An R
BE
resistor of between 20k
and 47k
is recommended for less power consumption.
4. Input Impedance
In order to control oscillation brought about as a result of impedance at the power supply line, connect a capacitor of 10
μ
F or more (Tantalum)
between the external transistor's emitter and the ground pin.
μ
μ
μ
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