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SS2509KSOT Datenblatt(PDF) 5 Page - SEC Electronics Inc.

Teilenummer SS2509KSOT
Bauteilbeschribung  Hall Latch - High Sensitivity
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Hersteller  SECELECTRONICS [SEC Electronics Inc.]
Direct Link  http://www.secsemi.com
Logo SECELECTRONICS - SEC Electronics Inc.

SS2509KSOT Datenblatt(HTML) 5 Page - SEC Electronics Inc.

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SS2509
Hall Latch - High Sensitivity
5
V3.10
Nov 1, 2013
state. The correct state is attained after the first excursion beyond BOP or BRP.
The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on in the pres-
ence of a sufficiently strong North 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)
between the supply (VDD Pin) and ground (GND Pin) of the device to reduce both external noise and noise gener-
ated by the chopper stabilization technique. As is shown in the two figures in next page, a 0.1μF capacitor is typi-
cal.
For reverse voltage protection, it is recommended to connect a resistor or a diode in series with the VDD pin. When
using a resistor, three points are important:
- the resistor has to limit the reverse current to 50mA maximum (VCC / R1
≤ 50mA)
- the resulting device supply voltage VDD has to be higher than VDD min (VDD = VCC – R1*IDD)
- the resistor has to withstand the power dissipated in reverse voltage condition (PD = VCC
2/R1)
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-
ring on the device supply voltage VDD. The diode D1 provides additional reverse voltage protection.
The SS2509 have been optimized for commutation applications in 5V and 12V brushless DC motors. The follow
figure is the typical application circuit for 3 phase brushless DC motors.
SS2509
R2
C2
VDD
GND
OUT
C1
SS2509
R1:100
R2
C2
VDD
GND
OUT
C1
Z1
D1
Automotive and Severe Environment Protec-
tion Circuit
Typical Three-Wire Application Circuit


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