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参数资料
| 型号： | R1230D1.51B-TR |
| 英文描述： | Analog IC |
| 中文描述： | 模拟IC |
| 文件页数： | 11/20页 |
| 文件大小： | 882K |
| 代理商： | R1230D1.51B-TR |
Rev. 1.15 - 11 -
I
External Components
1. Inductor
Select an inductor that peak
current does not exceed ILmax. If 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 C
IN
, use a capacitor with low ESR (Equivalent Series Resistance) Ceramic type of a capacity at least 10
μ
F
for stable operation.
C
OUT
can reduce ripple of Output Voltage, therefore as much as 10
μ
F tantalum type is recommended.
I
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
less.
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