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参数资料
| 型号： | R3117Q382A-C-F |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | LEAD FREE, SC-88, 5 PIN |
| 文件页数： | 3/29页 |
| 文件大小： | 456K |
| 代理商： | R3117Q382A-C-F |
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R3117x
11
Power supply injection order
The R3117xxxxA/C Series supervise the voltage of the SENSE pin. VDD pin and SENSE pin can be used at the
same voltage level. Likewise, VDD pin and SENSE pin can be used at the different voltage level. If the VDD pin and
SENSE pin are used at different voltage level, regarding the start-up sequence, force the voltage level to VDD pin
prior to the SENSE pin.
If the SENSE pin voltage is equal or more than the released voltage (+VDET), DOUT pin becomes "H". Besides, a
voltage beyond VDD pin is also acceptable to SENSE pin. Concerning the R3117xxxxA series (Nch open drain
output type), DOUT pin must be pulled-up with an external resistor.
t
VDD
VOUT
VSENSE
+VDET
Fig.1 Turn on sequence
Outside setting of the detection voltage
To monitor the voltage more than 5.0V or if the different detector threshold with using lower threshold device,
divider resistors can be applied to the SENSE pin. In this usage, some error range will be generated to the
detector threshold voltage caused by the internal resistor RSENSE (Fig.3) of the IC. Supposed that the detector
threshold voltage is described as Vs, the next equation will be true.
VS = -VDET
× (Ra+Rb)/Rb.
However, actually an error includes by SENSE resistance (RSENSE) of the IC inside. (Figure 3)
Ia = Ib + ISENSE
.......................................(1)
Ib = -VDET / Rb
.......................................(2)
Thus,
Ia = -VDET / Rb + ISENSE .......................................(3)
Therefore,
VS = -VDET + Ia
× Ra .......................................(4)
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