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AH266

HIGH VOLTAGE HALL EFFECT LATCH



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AH266 pdf
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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.
Pin Assignments
( Top View )
266
12 3 4
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 VZ = 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)
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. 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.
Typical Applications Circuit
266
123 4
Vcc
Coil 1 Coil 2
AH266
Document number: DS30876 Rev. 5 - 2
Brush-Less DC Fan
1 of 7
www.diodes.com
December 2013
© Diodes Incorporated



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AH266 pdf
Pin Descriptions
Pin Name
VCC
DO
DOB
GND
P/I/O
P
O
O
P
Pin #
1
2
3
4
Description
Power Supply Input
Output Pin
Output Pin
Ground
Functional Block Diagram
V1CC
REG.
Hal
Plal te
Amp
AH266
DO
DOB
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
VCC
Vout (off)
IO (con)
IO (hold)
IO (peak)
B
TST
PD
θJA
θJC
Supply Voltage
Output “OFF ” Voltage
Parameter
Output “ON” Current
Magnetic Flux Density
Storage Temperature Range
Power Dissipation (Note 6)
Thermal Resistance Junction-to-Ambient (SIP-4)
Thermal Resistance Junction-to-Case (SIP-4)
Rating
28
28
400 (Note 5)
500
700
Unlimited
-65 to +150
550
227
49
Unit
V
V
mA
mA
mA
Gauss
°C
mW
°C/W
°C/W
AH266
Document number: DS30876 Rev. 5 - 2
2 of 7
www.diodes.com
December 2013
© Diodes Incorporated



Part Number AH266
Description HIGH VOLTAGE HALL EFFECT LATCH
Maker Diodes - Diodes
Total Page 7 Pages
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