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RV5VE001C-E1 Datasheet

  • RV5VE001C-E1

  • MULTI-POWER SUPPLY

  • 49頁(yè)

  • RICOH

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RV5VE0
脳脳脳
TYPICAL APPLICATION
鈥?/div>
RV5VE001
脳
In this example of the circuit, the output of Regulator 4 is used as the power source for CPU. The voltage input
to CSW 1, 2, 3 pins is subject to level shift within the IC so as to have the same level as that of the voltage of CPU.
Therefore CSW 1, 2, 3 pins can be directly connected to CPU. Detector 1 monitors the voltage of the battery and
Detector 2 monitors the voltage of the power source for CPU.
Application for Cellular Phones (RV5VE001
脳
)
SBD
R3
R4
R
脳
5VE001
脳
R
OUT4
V
SEN2
C
D
RESET
D
OUT
R
OUT1
I
BC1
GND
V
DD
R
OUT3
V
SEN1
CSW3
CSW2
CSW1
R
OUT2
I
BC2
C5
I/O
I/O
I/O
Tr
R2
VCC
RESET
CPU
INT
Tr
R1
C
D
C1
C2
C4 C3
Memory
Unit
Logic
Unit
C1,2,5=10碌F / C3,4=0.1碌F / C
D
=0.1碌F
R1,2,3,4=100k鈩?/div>
Tr: 2SB799(NEC PNP type,h
FE
=100 to 200)
SBD: MA717(Panasonic)
Transmitter
Unit
Receiver/Audio
Unit
APPLICATION HINTS
When using these ICs, be sure to take care of the following points :
鈥?/div>
Minimize the impedance of V
DD
and GND wiring. In particular, with respect to the V
DD
wiring, the output cur-
rent of Regulators flows thereinto, so that when the wiring impedance is high, the operation of the IC tends to be
unstable and is vulnerable to noise.
鈥?/div>
Provide a capacitor with a capacitance of about 10碌F between V
DD
pin and GND pin with a minimum wiring
length.
鈥?/div>
Rush current flows into the capacitor connected to the output of Regulators at the start of the operation of the
Regulators. In particular, Regulators 1, 2 are equipped with External PNP Transistor and accordingly have
excellent drive performance. Therefore, when Regulators 1, 2 start to operate, for example, under the conditions
that h
FE
of External PNP Transistor is 100 and the base current of the limiter is 5mA, a rush current of 500mA
flows into the regulators. When the wiring impedance is high, the Power Source Voltage applied to IC tends to
be varied by the rush current, so that the operation of IC may be adversely affected by the variation of the Power
Source Voltage.
鈥?/div>
In these ICs phase compensation is made for securing stable operation even when the load current is varied.
Select the capacitors C1 to C4 conecting the Pin R
OUT
1
to R
OUT
4
with good frequency characteristics and small
ESR.
鈥?/div>
Be sure to connect a resistor with a resistance of about 100k鈩?between the base and the emitter for preventing
the oscillation.
鈥?/div>
Set external parts as close as possible to the IC and minimize the connection between the parts and the IC.
鈥?/div>
When using a capacitor connected to C
D
pin, use a Schottky Barrier Diode (SBD) to discharge C
D
capacitor at
the time of abrupt fluctuation of power source voltage.
46

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