BD61243FV Datasheet, PDF (20/31 Pages) Rohm – Multifunction Single-phase Full-wave

BD61243FV
Functional Descriptions – continued
7. Hall Input Setting
Hall input voltage range is shown in operating conditions (P.3). Adjust the value of hall element bias resistor R1,R2
in Figure 49 so that the input voltage of a hall amplifier is input in "Input Voltage Range 1"(P.3) including signal
amplitude. R2 is resistance to correct the temperature characteristic of the hall element.
Hall Input Upper Limit
H–
VREF+0.3V
H+
Operating Hall Input
Voltage Range
H–
H+
0V
Hall Input Lower Limit
Figure 48. Hall Input Voltage Range
REFE- REF
RENCE
H–
-
COMP
+
H+
C1
IH
Hall Bias Current;
IH[A] = VREF[V] / (R1+R2//RH)[Ω]
R1
Hall
VH
RH
C2 R2 _{Hall Bias Voltage;}
VH[V] = VREF[V] x (R2//RH) / (R1+R2//RH)[Ω]
Figure 49. Hall Input Application
(1) Reducing the Noise of Hall Signal
Vcc noise or the like depending on the wiring pattern of board may affect Hall element. In this case, place a
capacitor like C1 in Figure 49. In addition, when wiring from the hall element output to IC hall input is long, noise
may be induced on wiring. In this case, place a capacitor like C2.
8. High-speed detection protection
High-speed detection protection begin lock protection action when it detects that the hall input signal is in an abnormal
state (more than Typ 2.5kHz). Noise may be induced on wiring. In this case, place a capacitor like C2 in Figure 49.
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