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參數(shù)資料
| 型號： | R1282D002A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2CH PWM DC/DC CONTROLLER |
| 中文描述： | DUAL SWITCHING CONTROLLER, 805 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 0.90 MM HEIGHT, TSON-10 |
| 文件頁數(shù)： | 5/18頁 |
| 文件大?。?/td> | 327K |
| 代理商： | R1282D002A-TR |
R1282D002A
Operation of Step-up DC/DC Converter and Output Current
5
Step-up DC/DC Converter makes higher output voltage than input voltage by releasing the energy
accumulated during on time of L
X
Transistor on input voltage.
<Basic Circuit>
V
IN
GND
V
OUT
C
L
Diode
Inductor
Lx Tr
i2
i1
I
OUT
<Current through L>
Discontinuous Mode
Continuous Mode
Step 1. L
X
Tr. is on, then the current IL
=
i1 flows, and the energy is charged in L. In proportion to the on time of L
X
Tr. (Ton), IL
=
i1 increases from IL
=
IL
X
min
=
0 and reaches IL
X
max.
Step 2. When the L
X
Tr. is off, L turns on Schottky Diode (SD), and IL
=
i2 flows to maintain IL
=
IL
X
max.
Step 3. IL
=
i2 gradually decreases, and after Tf passes, IL
=
IL
X
min
=
0 is true, then SD turns off. Note that in the
case of the continuous mode, before IL
=
IL
X
min
=
0 is true, Toff passes, and the next cycle starts, then L
X
Tr. turns on again.
In this case, IL
X
min>0, therefore IL
=
IL
X
min>0 is another starting point and IL
X
max increases.
With the PWM controller, switching times during the time unit are fixed. By controlling T
on
, output voltage is
maintained.
IL
ILxmax
ILxmin
Tf
t
Ton
T=1/fosc
Toff
IL
ILxmax
ILxmin
t
Ton
T=1/fosc
Iconst
Toff
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