APX9268 datasheet(9/13 Pages) ANPEC

9 / 13 page

Rev. A.7 - Mar., 2008

www.anpec.com.tw

APX9268

Application Information

For example:

CC = 5V, IFG = 3mA, VFG = 0.2V, RFG = 1.6KΩ

The value of resistor in the range of 1k

Ω to 10kΩ is

recommended.

Thermal Consideration

The IC is safe to operate below the line and it will cause

the thermal protection if the operating area is above the

line. For example, T

A= 75°C, the maximum power dis-

sipation is about 0.35 W (See Power Dissipation

vs. Ambient Temperature). Mounted on a board, there is

60x38x1.6t mm, Glass epoxy. The power dissipation can

be calculated by the following equation:

D = (VCC - VOH + VOL) x IOUT + VCC x ICC

For example:

CC = 5V, ICC = 4mA, IOUT = 270mA, VOH = 4.83V,

OL = 0.17V,

then

D = 0.111W

The GND pin provides an electrical connection to ground

and channeling heat away. The printed circuit board (PCB)

forms a heat sink and dissipates most of the heat into

ambient air.

Figure 2 Different of output signal depending on the

shape

Input Protection Diode & Zener Diode & Capacitor

It should be added a protection diode (D1) to protect the

damage from the power reverse connection. However,

the protection diode will cause a voltage drop on the

supply voltage. The current rating of the diode must be

larger than the maximum output current. Connecting

VCC and GND with a Zener diode (D2) can avoid exceed-

ing the absolute maximum rating voltage. For the noise

reduction purpose, there is a capacitor (C1) 1

µF

(recommended) connecting VCC and GND (See Typical

Application Circuit).

Hall input

The output signal of this IC is the amplified hall input

signal, therefore, the output signal depends on hall input.

When the hall input is small, the output signal becomes

gentle. Oppositely, the input signal is large, the output

becomes steep (See Figure 2 Different of output sig-

nal depending on the shape of hall input signal). The

in put/output gain is 48dB(typ.). Thus, please adjust the

amplitude of hall input to meet the adequate output

voltage.

FG Resistor

The value of the FG resistor could be decided by the fol-

lowing equation:

−

(IN+)-(IN-)

OUT1

(IN+)-(IN-)

OUT1

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