- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄297328 > RP500N313A-TR-F (RICOH COMPANY LTD) 0.9 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO6 PDF資料下載
參數(shù)資料
| 型號： | RP500N313A-TR-F |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.9 A SWITCHING REGULATOR, 1440 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | LEAD FREE, SOT-23, 6 PIN |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 664K |
| 代理商： | RP500N313A-TR-F |
RP500x
10
Operation of step-down DC/DC converter and Output Current
The DC/DC converter charges energy in the inductor when LX transistor is ON, and discharges the energy
from the inductor when LX transistor is OFF and controls with less energy loss, so that a lower output voltage
than the input voltage is obtained. The operation will be explained with reference to the following diagrams:
<Basic Circuit>
<Current through L>
Pch Tr
L
Nch Tr
VIN
i1
VOUT
CL
i2
GND
T=1/fosc
ton
toff
topen
ILmin
ILmax
IL
i1
i2
Step 1: Pch Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment, IL increases
from ILmin (=0) to reach ILmax in proportion to the on-time period (ton) of Pch Tr.
Step 2: When Pch Tr. turns off, Synchronous rectifier Nch Tr. turns on in order that L maintains IL at ILmax,
and current IL (=i2) flows.
Step 3: IL (=i2) decreases gradually and reaches IL=ILmin=0 after a time period of topen, and Nch Tr. turns off.
Provided that in the continuous mode, next cycle starts before IL becomes to 0 because toff time is not
enough. In this case, IL value increases from this ILmin (>0).
In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton), with
the oscillator frequency (fosc) being maintained constant.
The maximum value (ILmax) and the minimum value (ILmin) of the current flowing through the inductor are the
same as those when Pch Tr. turns on and off.
The difference between ILmax and ILmin, which is represented by ΔI:
I = ILmax - ILmin = VOUT
× topen / L = (VIN - VOUT) × ton / L ......................................Equation 1
wherein,
T = 1 / fosc = ton + toff
duty (%) = ton / T
× 100 = ton × fosc × 100
topen <
= toff
In Equation 1, VOUT
× topen / L and (VIN - VOUT) × ton / L respectively show the change of the current at "ON", and
the change of the current at "OFF".
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RS11120-KDD-4F | 21 CONTACT(S), FEMALE, RIGHT ANGLE TELECOM AND DATACOM CONNECTOR, SOLDER |
| RS5C348A | 4-WIRE SERIAL INTERFACE |
| RS5C348B | 4-WIRE SERIAL INTERFACE |
| RT5C348B | 4-WIRE SERIAL INTERFACE |
| RV5C348A | 4-WIRE SERIAL INTERFACE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RP500X | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:The RP500X Series are CMOS-based step-down DC/DC Converters with synchronous rectifier. |
| RP50-2405S | 制造商:RECOM 制造商全稱:Recom International Power 功能描述:50 Watt Single Output |
| RP50-2405SN | 制造商:RECOM 制造商全稱:Recom International Power 功能描述:50 Watt Single Output |
| RP50-2405SP | 制造商:RECOM 制造商全稱:Recom International Power 功能描述:50 Watt Single Output |
| RP50-241.8S | 制造商:RECOM 制造商全稱:Recom International Power 功能描述:50 Watt Single Output |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。