Diodes AH266 User Manual
Ah266, Description, Features
AH266
Document number: DS30876 Rev. 5 - 2
1 of 7
December 2013
© Diodes Incorporated
AH266
HIGH VOLTAGE HALL EFFECT LATCH
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
and voltage range from 4V to 28V. The
devices are available in low cost die forms or rugged 4 pin SIP
packages.
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
Z
= 62V (Typ.)
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)
Pin Assignments
Applications
Dual-Coil Brushless DC Motor
Dual-Coil Brushless DC Fan
Revolution
Counting
Speed Measurement
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. S 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.
Typical Applications Circuit
1 2
4
3
266
Coil 1
Coil 2
V
cc
Brush-Less DC Fan
266
1 2
4
3
( Top View )
SIP-4
Green