參數(shù)資料
型號(hào)： R1211D103A
廠商： Ricoh Co., Ltd.
英文描述： STEP-UP DC/DC CONTROLLER
中文描述： 升壓型DC / DC控制器
文件頁(yè)數(shù)： 10/40頁(yè)
文件大?。?/td> 385K
代理商： R1211D103A
R1211x
Output Current and Selection of External Components
10
<Basic Circuit>
i1
CL
L
X
Tr
V
IN
I
OUT
V
OUT
i2
Inductor
GND
Diode
<Circuit through L>
Discontinuous Mode
Continuous Mode
IL
ILxmax
ILxmin
Tf
t
Ton
T=1/fosc
Toff
IL
ILxmax
ILxmin
t
Ton
T=1/fosc
Iconst
Toff
There are two modes, or discontinuous mode and continuous mode for the PWM step-up switching regulator
depending on the continuous characteristic of inductor current.
During on time of the transistor, when the voltage added on to the inductor is described as V
IN
, the current is
V
IN
×
t/L. Therefore, the electric power, P
ON
, which is supplied with input side, can be described as in next formula.
Ton
ON
×
.............................................................................................................................. Formula 1
dt
t/L
V
P
2
IN
0
=
∫
With the step-up circuit, electric power is supplied from power source also during off time. In this case, input
current is described as (V
OUT
V
IN
)
×
t/L, therefore electric power, P
OFF
is described as in next formula.
×
×
........................................................................................................ Formula 2
dt
t/L
)
V
(V
V
P
IN
OUT
IN
Tf
0
OFF
=
∫
In this formula, Tf means the time of which the energy saved in the inductance is being emitted. Thus average
electric power, P
AV
is described as in the next formula.
∫
∫
In PWM control, when Tf = Toff is true, the inductor current becomes continuos, then the operation of
switching regulator becomes continuous mode.
In the continuous mode, the deviation of the current is equal between on time and off time.
Toff/L
)
V
(V
/L
V
IN
OUT
ON
IN
×
=
×
T
................................................................................................... Formula 4
Further, the electric power, P
AV
is equal to output electric power, V
OUT
×
I
OUT
, thus,
{
}
/(2
T
V
)
V
(V
L
2
/
T
V
f
I
ON
IN
IN
OUT
ON
IN
OSC
OUT
×
=
×
×
×
×
=
dt}
t/L
)
V
(V
V
dt
t/L
V
{
)
T
1/(T
P
IN
OUT
IN
Tf
0
2
IN
Ton
0
OFF
ON
AV
×
×
+
×
×
+
=
................................................... Formula 3
)
V
L
OUT
2
2
2
×
×
.................................................... Formula 5
相關(guān)PDF資料
PDF描述
R1211D103C STEP-UP DC/DC CONTROLLER
R1211D104A STEP-UP DC/DC CONTROLLER
R1211N002B STEP-UP DC/DC CONTROLLER
R1215D002A STEP-UP DC/DC CONTOLLER
R1215D002B STEP-UP DC/DC CONTOLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R1211D103C 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER
R1211D104A 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER
R12-11D5-12 制造商:NTE Electronics 功能描述:POWER RELAY DPDT 12VDC 5A PLUG IN 制造商:NTE Electronics 功能描述:General Purpose Relay 制造商:NTE Electronics 功能描述:POWER RELAY, DPDT, 12VDC, 5A, PLUG IN; Relay Type:General Purpose; Coil Voltage VDC Nom:12V; Contact Current Max:5A; Contact Voltage AC Nom:240V; Contact Voltage DC Nom:28V; Coil Resistance:160ohm; Contact Configuration:DPDT ;RoHS Compliant: Yes
R12-11D5-24 制造商:NTE Electronics 功能描述:POWER RELAY DPDT 24VDC 5A PLUG IN 制造商:NTE Electronics 功能描述:POWER RELAY, DPDT, 24VDC, 5A, PLUG IN 制造商:NTE Electronics 功能描述:RELAY-5AMP-DC-24V 制造商:NTE Electronics 功能描述:POWER RELAY, DPDT, 24VDC, 5A, PLUG IN; Relay Type:General Purpose; Coil Voltage VDC Nom:24V; Contact Current Max:5A; Contact Voltage AC Nom:240V; Contact Voltage DC Nom:28V; Coil Resistance:650ohm; Contact Configuration:DPDT ;RoHS Compliant: Yes
R1211N002A 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:Step-up DC/DC Controller
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*