參數(shù)資料
型號(hào): XC62E_1
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(yè)數(shù): 6/12頁(yè)
文件大小: 620K
代理商: XC62E_1
6/12
XC62E
Series
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 hFE
characteristics be used.
2. RB 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.
TYPICAL APPLICATION CIRCUIT
Standard Circuit
OPERATIONAL EXPLANATION
V
IN
(MIN.)-1.2(V)
R
B
0.7(V)
R
BE
I
OUT
(MAX.)
hFE
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 setting 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.
NOTES ON USE
3. RBE Resistor, CL Capacitor
To prevent oscillation due to output load variation, use of a phase compensation capacitor CL is recommended. Please
use a Tantalum capacitor of at least 10mF. Please also use an RBE resistor of less than 47k
An RBE 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
F or more (Tantalum) between the external transistor's emitter and the ground pin.
Protection Circuit
The built-in protection circuit is to protect the IC only. Therefore to prevent output shorts and overshoot current through
the transistor, use of a resistor RB or an overshoot current protection circuit is recommended.
Care should also be taken with the transistor's power dissipation.
.
V
IN
V
OUT
Vss
CE
R
BE
R
B
EXT
R
V
IN
PNP Tr
C
Tantalum
L
TaC
External Components:
PNP Tr.: 2SA1213
RBE: 20k
Ω
~ 47k
Ω
RB: Please refer to Note 2 on the following page.
C
IN
: 10
μ
F (Tantalum)
CL: 47
μ
F (Tantalum) 10
μ
F minimum
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