DRV5023_16 Datasheet, PDF (14/28 Pages) Texas Instruments – Digital-Switch Hall Effect Sensor

DRV5023
SLIS151E – MAY 2014 – REVISED FEBRUARY 2016
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Feature Description (continued)
7.3.4 Output Stage
The DRV5023 output stage uses an open-drain NMOS, and it is rated to sink up to 30 mA of current. For proper
operation, calculate the value of the pullup resistor R1 using Equation 1.
V_ref max _{d R1 d} V_ref min
30 mA
100 µA
(1)
The size of R1 is a tradeoff between the OUT rise time and the current when OUT is pulled low. A lower current
is generally better, however faster transitions and bandwidth require a smaller resistor for faster switching.
In addition, ensure that the value of R1 > 500 Ω to ensure the output driver can pull the OUT pin close to GND.
NOTE
V_ref is not restricted to V_CC. The allowable voltage range of this pin is specified in the
Absolute Maximum Ratings.
V_ref
OCP
Gate
Drive
R1
OUT
I_SINK
C2
GND
Figure 17.
Select a value for C2 based on the system bandwidth specifications as shown in Equation 2.
u ¦_BW +]
1
2S u R1 u C2
(2)
Most applications do no require this C2 filtering capacitor.
14
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