Diodes AH266 User Manual

A

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Green

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, a Schmitt
trigger to provide switching hysteresis for noise rejection, and
complementary Darlington open-collector drivers for sinking large
current loads. An internal band-gap 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 operation point (Bop), DO
will turn on (low) and DOB will turn off (high). The output state is
latched prior to reaching release point (Brp). If B< Brp, DO will turn off
and DOB will turn on. AH266 is rated for operation over temperature
range from -20°C to +85°C
devices are available in low cost die forms or rugged 4 pin SIP
packages.

and voltage range from 4V to 28V. The

Pin Assignments

H266

HIGH VOLTAGE HALL EFFECT LATCH

( Top View )

266

1 243

SIP-4

Features

 On-Chip Hall Plate
 Operating Voltage: 4V to 28V
 Output Current: 400mA (Continuous, +25°C)
 Reverse Protection Diode Only for Chip Reverse Power

Connecting (Note 1)

 Output Protection Zener Breakdown V
 Lead Free package: SIP-4

 SIP-4: Available in “Green” Molding Compound (No Br, Sb)

 RoHS Compliant (Note 2)
 Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)

Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.

= 62V (Typ.)

Z

Applications

 Dual-Coil Brushless DC Motor
 Dual-Coil Brushless DC Fan
 Revolution Counting
 Speed Measurement

Typical Applications Circuit

266

Coil 1

Coil 2

AH266

Document number: DS30876 Rev. 5 - 2

V

cc

12 43

Brush-Less DC Fan

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Pin Descriptions

Pin Name P/I/O Pin # Description

V

DO O 2 Output Pin
DOB O 3 Output Pin
GND P 4 Ground

Functional Block Diagram

V

CC

1

CC

H266

P 1 Power Supply Input

DO

REG.

Hal

l

Plate

Amp

Absolute Maximum Ratings (@T

Symbol Parameter Rating Unit

VCC

V

out (off)

I

O (con)

I

O (hold)

I

O (peak)

B Magnetic Flux Density Unlimited Gauss

TST

PD

θJA

θJC

AH266

Document number: DS30876 Rev. 5 - 2

Supply Voltage 28 V

Output “OFF ” Voltage 28 V

Output “ON” Current

Storage Temperature Range -65 to +150 °C

Power Dissipation (Note 6)

Thermal Resistance Junction-to-Ambient (SIP-4) 227 °C/W

Thermal Resistance Junction-to-Case (SIP-4) 49 °C/W

= +25°C, unless otherwise specified.)

A

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400 (Note 5) mA

DOB

500 mA

700 mA

550 mW

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© Diodes Incorporated

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)

H266

Recommended Operating Conditions (@T

Symbol Characteristic Conditions Min Max Unit

VCC

TA

Notes: 4. This application circuit can’t protect reverse coil current if power is connecting reverse.

5. I

6. See Performance Characteristics for other conditions.

7. Shall not exceed P

Electrical Characteristics (@T

Symbol Characteristic Conditions Min Typ. Max Unit

Supply Voltage Operating 4 28 V

Operating Ambient Temperature (Note 7) Operating -20 85 °C

is 150 mA at +85°C.

o (con)

and Safety Operation Area.

D

= +25°C, unless otherwise specified.)

A

= +25°C, unless otherwise specified.)

A

Vz

V

CE (SAT

I

CEX

ICC

tr Output Rise Time

tf Output Falling Time

t Switch Time Differential

Output Zener Breakdown Output Turn off 54 62 70 V

Output Saturation Voltage

Output Leakage Current

Supply Current

Test Circuit

24V

VCC = 24V, IC = 400mA

VCE = 24V, VCC = 24V

VCC = 24V, Output Open

V

= 24V, RL = 820Ω, CL = 20pF

CC

V

= 24V, RL = 820Ω, CL = 20pF

CC

V

= 24V, RL = 820Ω, CL = 20pF

CC

266

－

－

－

－

－

－

1.1 1.5 V

< 0.1

5 10 mA

1.0 5 µs

1.0 1.5 µs

3.0 10 µs

10 μA

V

1 (DO)

out

RL1

2 (DOB)

V

out

RL2

CL2

RL1 = RL2 = 820 Ohm

CL1 = CL2 = 20 pF

AH266

Document number: DS30876 Rev. 5 - 2

CL1

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