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參數(shù)資料
| 型號： | R1230D121H-TL |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 920 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.9 MM HEIGHT, SON-8 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大小： | 401K |
| 代理商： | R1230D121H-TL |
Rev. 1.20
- 11 -
and VOUT=3.6V, phase back becomes also large, and even if the device is used with a heavy load, the operation will
be stable.
Rb is effective for reducing the noise on VFB, however, it is not always necessary. If it is necessary, use as much as
30k
as Rb.
s External Components
1. Inductor
Select an inductor that peak current does not exceed ILmax. If some larger current than allowable current flows,
magnetic saturation occurs and make transform efficiency worse.
Supposed that the load current is at the same, the smaller value of L is used, the larger the ripple current is.
Provided that the allowable current is large in that case and DC current is small, therefore, for large output current,
efficiency is better than using an inductor with a large value of L and vice versa.
2. Capacitor
As for CIN, use a capacitor with low ESR (Equivalent Series Resistance) Ceramic type of a capacity at least 10
F
for stable operation.
COUT can reduce ripple of Output Voltage, therefore as much as 10
F tantalum type is recommended.
3. Diode
If VFM mode is chosen at light load, use a Schottky diode with small VF. A diode with small VF makes the efficiency
of the circuit improved. Small reverse direction current, IR is an important factor, however, VF has more important
priority than IR.
s TIMING CHART
Internal Oscillator Waveform
Internal Operational
Amplifier Output
Internal Soft-start
Set Voltage
Lx Pin Output
Soft-start Time
Stable
Output
Short
Delay Time of Protection
Latched
CE pin Voltage
Output Short
The timing chart as shown above describes the waveforms starting from the IC is enabled with CE and latched with
protection. During the soft-start time, until the level is rising up to the internal soft-start set voltage, the duty cycle of Lx
is gradually wider and wider to prevent the over-shoot of the voltage. During the term, the output of amplifier is “H”,
then after the output voltage reaches the set output voltage, they are balanced with the stable state. Herein, if the
output pin would be short circuit, the output of amplifier would become “H” again, and the condition would continue for
1.5ms (Typ.), latch circuit would work and the output of Lx would be latched with “OFF”. (Output =“High-Z”)
If the output short is released before the latch circuit works (within 1.5ms after output shorted), the output of amplifier
is balanced in the stable state again.
Once the IC is latched, to release the protection, input “L” with CE pin, or make the supply voltage at UVLO level or
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