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参数资料
| 型号： | RS5RM5633B-T2-FA |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.25 A SWITCHING REGULATOR, 60 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP-8 |
| 文件页数： | 27/29页 |
| 文件大小： | 585K |
| 代理商： | RS5RM5633B-T2-FA |
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7
RS5RM
OPERATION OF STEP-UP DC/DC CONVERTER
Step-up DC/DC Converter charges energy in the inductor when Lx Transistor (LxTr) is ON, and discharges the
energy with the addition of the energy from Input Power Source thereto when LxTr is OFF, so that a higher out-
put voltage than the input voltage is obtained.
The operation will be explained with reference to the following diagrams :
< Current through L >
< Basic Circuits >
i2
SD
LX Tr
i1
L
CL
VIN
IOUT
VOUT
IL
IL min
IL max
topen
ton
toff
t
T=1/ fosc
Step.1: LxTr is turned ON and current IL (=i1 ) flows, so that energy is charged in L. At this moment, IL(=i1 ) is
increased from ILmin (=0) to reach ILmax in proportion to the on-time period (ton) of LxTr.
Step.2: When LxTr is turned OFF, Schottky diode (SD) is turned ON in order that L maintains IL at ILmax, so that
current IL (=i2) is released.
Step.3: IL (=i2) is gradually decreased, and in the case of discontinuous mode, IL reaches ILmin (=0) after a time
period of topen, so that SD is turned OFF. In the case of a continuous mode,the time period (toff) runs out
before IL reaches ILmin (=0), so that LxTr is turned ON in the next cycle, and SD is turned OFF. In this
case, ILmin does not reach zero, and IL (=i1) increases from ILmin (>0).
In the case of PWM control system, with the oscillator frequency (fosc) maintained constant, the output volt-
age is maintained constant by controlling the on-time period (ton).
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