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參數(shù)資料
| 型號： | RP505K061B-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 2 X 2 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-8 |
| 文件頁數(shù)： | 32/32頁 |
| 文件大?。?/td> | 938K |
| 代理商： | RP505K061B-TR |
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RP505K
9
TECHNICAL NOTES
When you use these ICs, consider the following issues:
Set the same level as AGND and PGND.
Set the same level as AV
IN
and PVIN.
Place the external parts as close as possible to the IC by using a short as possible wiring. Especially, place the
capacitor as close as possible to the VIN and PGND pins. Ensure the VDD and GND lines are sufficiently robust.
If their impedances are too high, the electrical potential of the inside of the IC could be fluctuated by switching
current, and noise pickup or unstable operation could be the results. Please note that the large switching
current flows through the VDD line, the GND line, an inductor, the LX, and the VOUT line. Separate the line
between the VOUT pin and an inductor (A and B versions), and the line between a resistor for setting output
voltage (R1) and an inductor (C version), from the line connected to the load. Use a ceramic capacitor with the
small ESR value.
The recommended capacitance value for the C
IN
capacitor connected between the VIN and PGND pins is 4.7F
or more. Also, the recommended capacitance value for the COUT capacitor is 10F.
The Inductance value should be set within the rage of 1.0 to 2.2H. However, the inductance value is limited by
output voltage, so please refer to the table below. For stable operation, the phase compensation is set
according to the specified inductance value and the specified COUT capacitance value. Select the inductor with
low DC resistance, with large permissive current, with high resistant to magnetic saturation. Select the
inductance value considering the load current by the conditions of use. If the inductance value is small, the LX
peak current may increase along with the increase of load current. When the LX peak current reaches to the “LX
limit current”, the current limit circuit may be activated.
【Inductance range vs. output voltage range】
V[V]
L=1.0μH
L=1.5μH
L=2.2μH
0.6~1.55
○
1.6~2.3
×
○
2.35~3.3
×
○
Please note that Current limit circuit and Latch type protection circuit could be affected by self-heating or heat
dissipation environment.
For adjustable output voltage type (C version), the output voltage (V
OUT
) is adjustable by changing the R1 and
R2 values as follows.
VOUT = VFB
× (R1 + R2) / R2
(0.8V <
= VOUT <
= 3.3V)
If the R1 and R2 values are large, the impedances of the VFB pin become large and could be easily affected by
noise. Therefore, set the R2 value to 220k or less. If the operation becomes unstable due to the high
impedance, the impedance should be decreased. The C1 value can be calculated by the following formula.
Please use the value close to the calculation result.
C1 = 4.84
× 10-6 / R2 [F]
The performance of power supply circuits using this IC largely depends on the peripheral circuits. Please be
very careful when setting the peripheral parts. When designing the peripheral circuits of each part, PCB
patterns, and this IC, please do not exceed the rated values (Voltage, Current, Power).
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