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參數(shù)資料
| 型號： | R1285L591A |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, DSO12 |
| 封裝： | 2.70 X 3 MM, DFN-12 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 241K |
| 代理商： | R1285L591A |
R1285L
10
●Inverting DC/DC converter output voltage setting [ R1285L00xB ]
The output voltage VOUTN of the inverting DC/DC converter is controlled with maintaining the VFBN as 0V.
VOUTN can be set with adjusting the values of R1 and R2 as in the next formula.
VOUTN = VFBN - (VREF-VFBN) x R2 / R1
DC/DC converter’s phase may lose 180 degree by external components of L and C and load current. Because of
this, the phase margin of the system will be less and the atability will be worse. Therefore, the pahse must be
gaind.
A pole will be formed by external components, L and C.
Fpole ~ 1 / {2 x π x √(L2xC2)}
Zero will be formed with R2 and C4.
Fzero ~ 1 / (2 x π x R2 x C4)
Set the cutt-off frequency of the Zero close to the cutt-off frequency of the pole by L and C.
If the noise of the system is large, the output noise affects the feedback and the operation may be unstable. In
that case, another resistor R3 will be set. The appropriate value range is from 1k
Ω to 5kΩ.
●
Set a ceramic 1
μF to 2.2μF capacitor between VREF and GND as C5. [ R1285L00xB ]
Operation of Step-up DC/DC Converter and Output Current
Discontinuous Mode
ILxmax
ILxmin
Ton
Toff
T=1/fosc
Tf
IL
t
ILxmax
IL
ILxmin
Ton
Toff
T=1/fosc
t
Continuous Mode
<Current through L>
<Basic Circuit>
Inductor
Diode
CL
Lx Tr
VIN
VOUT
IOUT
IL1
IL2
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