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參數(shù)資料
| 型號： | R1202N723D-TR-FE |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.9 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | HALOGEN FREE AND ROHS COMPLIANT, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 6/23頁 |
| 文件大小： | 572K |
| 代理商： | R1202N723D-TR-FE |
R1202x
14
In the continuous mode, the variation of current of i1 and i2 is same at regular condition.
VIN
× ton / L = (VOUT - VIN) × toff / L ..........................................................................Formula 3
The duty at continuous mode will be
duty (%)= ton / (ton + toff)
= (VOUT - VIN) / VOUT.........................................................Formula 4
The average of inductor current at tf = toff will be
IL1(Ave.) = VIN
× ton / (2 × L) .................................................................................Formula 5
If the input voltage = output voltage, the IOUT will be
IOUT = VIN
2 × ton / (2 × L × VOUT)...............................................................................Formula 6
If the IOUT value is large than above the calculated value (Formula 6), it will become the continuous mode, At this
status, the peak current (ILmax) of inductor will be
ILmax = IOUT
× VOUT / VIN + VIN × ton / (2 × L )
ILmax = IOUT
× VOUT / VIN + VIN × T × (VOUT - VIN) / (2 × L × VOUT)...............................Formula 7
The peak current value is larger than the IOUT value. In case of this, selecting the condition of the input and the
output and the external components by considering of ILmax value.
The explanation above is based on the ideal calculation, and the loss caused by LX switch and the external
components are not included.
The actual maximum output current will be between 50% and 80% by the above calculations. Especially, when
the IL is large or VIN is low, the loss of VIN is generated with on resistance of the switch. Moreover, it is necessary to
consider Vf of the diode (approximately 0.8V) about VOUT.
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