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參數(shù)資料
| 型號： | R1250V201A-E2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Negative Output Charge Pump Regulator(100mA) |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 322 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 159K |
| 代理商： | R1250V201A-E2 |
R1250V××1A
12
OPERATION
1)
Basic Operation
The R1250V
××
1A Series make SW1 through SW4 ON and OFF by the clock generated by internal oscillator (OSC)
with fixed frequency, and operate as a inverting charge pump with the capacitor C
P
and the capacitor C
OUT
.
The Output Voltage is feedback and the voltage between the Output Voltage and Reference Voltage (Vref =
V
OUT
V) is divided half, and it is compared with the GND (=0V) level by an internal operational amplifier.
By this action, the impedance of SW3 is controlled to correspond with its load current and Output Voltage keeps
“Set V
OUT
” level.
2)
Status of Internal Circuits at Standby mode and Standby Current
At Standby mode, R1250V Series keep the voltage of C
P
as shown below:
V
IN
C
IN
C
P
R
O
up to 5k
R
OUT
C
OUT
V
OUT
R1250V
××
1A
When you design a system with using this IC, consider the following subjects;
2-(1)
If very small leakage current would be a critical, the leakage current of both C
IN
and C
P
should be considered.
2-(2)
Because the voltage level of C
P
keeps as much as V
DD
level, the speed for start-up from stand-by mode is faster
than the start-up by power-on.
2-(3)
V
OUT
is internally pulled down through 5k
to GND. Time constant “
τ
” of transient response (turn-off speed) of
V
OUT
can be calculated as follows:
τ
(5[k
]
R
OUT
)
×
C
OUT
(R
OUT
: Output load resistance)
2-(4)
Load current should be OFF synchronously with this IC if the load is electronic or connected between V
IN
and
V
OUT
. If some charge is continuously flown to the Output V
OUT
at the “OFF” state, the voltage level of V
OUT
will
rise and could be beyond 0V And if the voltage will be +0.3V (that is designated as absolute maximum rating.),
this IC might be break down.
3)
Ripple Voltage
Ripple voltage of Output waveform can be roughly calculated as follows:
Vripple [mVp-p]
0.5
×
(I
OUT
[mA] + Supply Current at no load [mA]) / (Oscillator Frequency: 280000 [Hz])
/ C
OUT
[F]
Supply Current at no load [mA]
Supply Current 1 [mA]
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