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參數(shù)資料
| 型號(hào)： | 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)： | 3/23頁 |
| 文件大?。?/td> | 572K |
| 代理商： | R1202N723D-TR-FE |
R1202x
11
CE
VFB
R1
Hduty
Dimming control by CE pin input
Soft-Start ( R1202xxxxA/B )
The output and referrence of the error amplifier start from 0V and the referrence gradually rises up to 1.0V.
After the softstart time (TSS), output voltage rise up to the setting voltage.
Shutdown
At standby mode, the output is completely separated from the input and shutdown by the NPN transistor of
internal IC. However, the leakage current is generated when the LX pin voltage is higher than VIN pin voltage at
standby mode.
R1202xxxxA (with auto discharge function): In the term of standby mode, the switch between VOUT to GND is
turned ON and output capacitor is discharged.
Protect Function
If the over current is detected, internal mosfet will turn-off soon. At the next operating period, mosfet will turn-on
again and continue to watch the current.
The UVLO function and the thermal shutdown function are turned off the NMOS-driver and NPN-transister
when the VIN decreases more than the UVLO detect threshold voltage or the inside of IC exceeds the thermal
shutdown detect temperature, and reset IC when the VIN rises more than the UVLO release voltage or the inside
of IC falls below the thermal shutdown release temperature, and restart the operation.
Selection of Inductor
The peak current of the inductor at normal mode can be calculated as next formula:
ILmax = 1.25
× ILED × VOUT / VIN + 0.5 × VIN × (VOUT - VIN) / (L × VOUT × fosc)
When the start-up or dimming control by CE pin, transient current flows, the peak current must be equal or
less than the current limit of the IC. The peak current should not beyond the rating current of the inductor.
The recommended inductance value is 10
μH - 22μH.
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