当前位置：文档库 › AH284T-YL中文资料

AH284T-YL中文资料

AH266

High Voltage Hall Effect Latch

Features

- On-chip Hall plate

- Operating voltage: 4V~28V

- Output current: 400mA(Continuous , 25o C) - Reverse protection diode only for chip reverse power connecting (Note)

- Output protection Zener breakdown Vz=62V(Typ) - Package: SIP-4L

(Note)

Protection diode only exists at power pin(1,4) output, not including pin (2,3).

Application

- Dual-coil Brush-less DC Motor - Dual-coil Brush-less DC Fan - Revolution Counting - Speed Measurement

Pin Assignment

1. VCC

2. DO 4. GND

3. DOB

General Description

AH266 is an integrated Hall sensor with output drivers designed for electronic commutation of brush-less DC motor applications. The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide switching hysteresis for noise rejection, and complementary darlington open-collector drivers for sinking large current loads. An internal bandgap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range.

If a magnetic flux density (B) is larger than operate point (Bop), DO turn on (low) and DOB turn off (high). The outputs state is latched prior to reach release point (Brp). if B< Brp, DO turn off and DOB turn on. AH266 is rated for operation over temperature range from -20o C to 85 o C and voltage range from 4V to 28V. The devices are available in low cost die forms or rugged 4 pin SIP packages.

Pin Configuration

Name Description

VCC Positive Power Supply DO

Output Pin DOB Output Pin GND

Ground

Ordering Information

AH266X -X X X -X

Packing Blank :Tube A :Taping

P:SIP-4L

Package Lead L :Lead Free Blank: Normal

Wafer Body Magnetic Characteristics

A~Z : if necessary to specify

AH266

High Voltage Hall Effect Latch

Block Diagram

REG.

Hall Plate

Amp

DOB

Typical Application Circuit

124

3266

coil1coil2

Vcc

Brush-less DC Fan

Note: This application circuit can’t protect reverse coil current if power is connecting reverse.

AH266

High Voltage Hall Effect Latch

Absolute Maximum Ratings (at Ta = 250C )

Parameter

Symbol

Rating Unit

Supply voltage

VCC 28 V Output “OFF ” voltage Vout (off) 28 V Io (con) 400 (Note 1) mA Io (hold) 500 mA Output “ON” current

Io (peak) 700 mA

Magnetic flux density

B Unlimited Gauss Operating temperature range Top -20~+85 °

C Storage temperature range Tstg -65~+150 °C Power dissipation (Note 2) P

D 550 mW Thermal Resistance

θjc 227 °C/W

Note 1: Io(con) is 150 mA at 85°C

2: See Performance Characteristic for other conditions

Electrical Characteristics ( Ta = 25°C )

Characteristic Symbol

Conditions

Min Typ

Max

Unit

Supply Voltage

Vcc

－ 4 － 28 V

Output Zener Breakdown Vz Output Turn off 54 62 70 V

Output Saturation Voltage Vce(sat) Vcc 24V, Ic 400mA － 1.1 1.5 V Output Leakage Current Icex Vce=24V, Vcc=24V － < 0.1 10 μA Supply Current Icc Vcc=24V, Output Open － 5 10 mA

Output Rise Time tr Vcc=24V, RL=820?, CL=20pF － 1.0 5 μs Output Falling Time tf Vcc=24V, RL=820?, CL=20pF

－ 1.0 1.5 μs Switch Time Differential ?t

Vcc=24V, RL=820?, CL=20pF －

3.0 10 μs

Test Circuit

266

CL1

CL2

24V

Vout1(DO)

Vout2(DOB)

RL1=RL2=820 Ohm CL1=CL2=20 pF

RL2

RL1

AH266

High Voltage Hall Effect Latch

Magnetic Characteristics (Ta=+25o C)

(1mT = 10 Gauss) A grade

Characteristic

Symbol

Min.

Typ.

Max.

Unit

Operate Point Bop 10 - 70 Gauss Release Point Brp -70 - -10 Gauss Hysteresis Bhy - 80 - Gauss B grade

Characteristic

Symbol

Min.

Typ.

Max.

Unit

Operate Point Bop - - 100 Gauss Release Point Brp -100 - - Gauss Hysteresis Bhy - 80 - Gauss

O u t p u t V o l t a g e i n V o l t s

Magnetic Flux Density in Gauss

DOB

Bop

Brp

B hy Turn on

Turn off B hy Turn off Turn on Vsat

Vsat

Performance Characteristics (SIP-4L)

Ta (°C)

25 50 60 70 80 85 90 95 100

Pd (mW) 550 440 396 352 308 286 264 242 220 Ta (°C) 105 110 115 120 125 130 135 140 150 Pd (mW)

198 176 154 132 110 88 66 44 0

Power Dissipation Curve

01002003004005006000

3045607590105120135150Ta (。C)

Pd (mW)

AH266

High Voltage Hall Effect Latch

Operation Characteristics

Marking side

B hy

V sat

V cc

( O u t p u t V o l t a g e )

V d

( Magnetic flux density )

High

Low

( SIP4 )

Marking Information

266

Part Number

( Front View )

"2" = 2002

"1" = 2001

X XX X X

AH266

High Voltage Hall Effect Latch

Package Information

Active Area Depth

Package Sensor Location

0.7mm

1234

1.971mm

Package Dimension

14.25mm +/-1.25mm

1.03mm +/-0.1

+/-0.1mm

0.38mm +/-0.03mm

5.22m m +/-0.1m m 4.20m m +/-0.1m m

3.65mm +/-0.1mm

1.42mm+/-0.1mm

1.27mm +/-0.03mm

0.41mm +/-0.03mm

0.30mm +/-0.1mm

+/-0.03m m

0.46mm +/-0.03mm

0.2mm Max.5o

-7

-5

3o -5

5o -7