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参数资料
| 型号： | R3117Q422C-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： | 4/29页 |
| 文件大小： | 456K |
| 代理商： | R3117Q422C-C-F |
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R3117x
12
Put Equation (3) into Equation (4), then
VS = -VDET
× (Ra + Rb) / Rb + Ra × ISENSE
Ra
× ISENSE is an error in VS.
Ra
× ISENSE = Ra × (-VDET) / RSENSE
= -VDET
× Ra / RSENSE
The error range is -VDET
× Ra/RSENSE (Fig.3) and to make it small, choosing the low detector threshold voltage
type and set the resistance values Ra, Rb as RSENSE >>Ra. Refer to the electrical characteristics table to see the
RSENSE value.
VDD
SENSE
GND
R3117x
Series
DOUT
-VDET
Ra
Rb
Vs
VDD
RSENSE
SENSE
GND
R3117x
Series
-VDET
Ra
Rb
Vs
ISENSE
Ia
Ib
Fig.2
Fig.3
Accuracy Detector Threshold
If the VDD bias voltage is lager than 5.25V, and to keep the detector threshold accuracy level, or if the maximum
operating voltage line must be used as the VDD bias voltage, the input voltage must be set low by using the
divider resistors which are shown in Fig.4.
VDD
GND
R3117x
Series
DOUT
SENSE
-VDET
Ra
Rb
Vs
R2
R1
VB
Fig.4
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