SS2509-R

Hall Latch - High Sensitivity

5

V3.10

Dec 1, 2014

magnetic fields with equivalent strength and opposite direction drive the output high and low.

The TSOT-23 device is reversed from the UA package. The TSOT-23 output transistor will be latched on in the

presence of a sufficiently strong South pole magnetic field applied to the marked face.

Application Information

It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor)

ated by the chopper stabilization technique. As is shown in the two figures in next page, a 0.1μF capacitor is typi-

cal.

using a resistor, three points are important:

≤ 50mA)

When using a diode, a reverse current cannot flow and the voltage drop is almost constant (

≈0.7V).

Therefore, a 100

Ω/0.25W resistor for 5V application and a diode for higher supply voltage are recommended. Both

solutions provide the required reverse voltage protection.

When a weak power supply is used or when the device is intended to be used in noisy environment, it is recom-

mended that the second following figure is used.

The low-pass filter formed by R1 and C1 and the Zener diode Z1 bypass the disturbances or voltage spikes occur-

The SS2509-R have been optimized for commutation applications in 5V and 12V brushless DC motors. The fol-

low figure is the typical application circuit for 3 phase brushless DC motors.

SS2509-R

R2

C2

VDD

GND

OUT

C1

SS2509-R

R1:100

R2

C2

VDD

GND

OUT

C1

Z1

D1

Automotive and Severe Environment Protec-

tion Circuit

Typical Three-Wire Application Circuit