Document
AH375
SINGLE PHASE HALL EFFECT LATCH
Description
Pin Assignments
AH375 is an integrated Hall-Effect latched sensor 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 open drain output. An internal band-gap regulator provides a temperature compensated supply voltage for internal circuits and allows a wide operating supply range.
When the magnetic flux density (B) is larger than operate point (Bop), output is switched on (OUT pin is pulled low). The output state is held on until a magnetic flux density reversal falls below Brp. When B is less than Brp, the output is switched off.
(Top View) SIP-3L
3. OUT 2. GND 1. Vdd
(Top View)
GND 2. SC59
3. OUT 1. Vdd
The AH375 is available in SIP-3L and SC59 packages.
Features
• Bipolar Hall-Effect latch sensor • 2.2V to 20V DC Operating voltage • Temperature compensation • Open drain pre-driver • 25mA maximum output sink current • Operating temperature: -40°C to +125°C • SIP-3L and SC59 packages
(SC59 is commonly known as SOT23 in Asia) • Green Molding Compound (No Br, Sb) (Note 1)
Applications
• Brush-Less DC Motor • Brush-Less DC Fan • Revolution Counting • Speed Measurement
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
Vdd
AH375
Document number: DS31172 Rev. 6 - 2
RL
C1
AH375 3 2
Output
GND
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AH375
SINGLE PHASE HALL EFFECT LATCH
Pin Descriptions
Pin Name Vdd GND OUT
P/I/O P P O
Pin # 1 2 3
Description Positive Power Supply Ground Output Pin
Functional Block Diagram
Vdd 1
Regulator
Hall plate
Amp
23 OUT
2 GND
Absolute Maximum Ratings (TA = 25°C)
Symbol
Vdd B VDS Id TS
TJ(MAX)
PD
Characteristics Supply Voltage Magnetic Flux Density Output OFF Voltage Output “On” Current Storage Temperature Range Maximum Junction Temperature
Package Power Dissipation
θJC Thermal Resistance
Continuous
SIP-3L SC59 SIP-3L SC59
Recommended Operating Conditions
Values
20 Unlimited
30 25 -65~+150 150 550 230
227 543
Unit V
V mA °C °C mW
°C/W
Symbol
Parameter
Conditions
Min
Max
Unit
Vdd Supply Voltage (Note 2) TA Operating Ambient Temperature
Operating Operating
2.2 -40
20 V 125 °C
Notes: 2. The output of IC will be switched after the supply voltage is over 2.2V, but the magnetic characteristics won't be normal until the supply is over 2.5V.
AH375
Document number: DS31172 Rev. 6 - 2
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AH375
SINGLE PHASE HALL EFFECT LATCH
Electrical Characteristics (TA = 25 °C, Vdd = 12V)
Symbol
VDS (SAT) Ioff Idd
Characteristic
Output Saturation Voltage Output Leakage Current Supply Current
Test Conditions
Iout = 20mA VDD = 14V Output Open
Min
-
Typ.
300 <0.1
2
Max
Unit
700 mV 10 uA 4 mA
Magnetic Characteristics (TA = 25 °C, Vdd = 2.5V to 20V, Note 3)
Symbol
Parameter
Min Typ.
Bops(south pole to brand side) Brps(south pole to brand side)
Bhy(|Bopx|-|Brpx|)
Operation Point Release Point Hysteresis
5 30 -60 -30
- 60
Notes: 3. Magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
(1mT = 10 Gauss)
Max
Unit
60 Gauss -5 Gauss - Gauss
Operating Characteristics
SS
Marking side
Marking side
NN
(SC59) (SIP-3L)
(Output Voltage)
Output
(off-state)
Vdd
Turn off
Bhy
Turn on
V SAT
Brp 0
(on-state)
VSAT Bop
( Magnetic Flux Density B)
AH375
Document number: DS31172 Rev. 6 - 2
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© Diodes Incorporated
AH375
SINGLE PHASE HALL EFFECT LATCH
Performance Characteristics
(1) SIP-3L TA (°C) PD (mW) TA (°C) PD(mW)
25 50 60 70 80 85
550 440 396 352 308 286
105 110 115 120 125 130
198 176 154 132 110
88
P D (m W ) 600 500 400 300 200 100 0 -04 0
P ow er D iss ipation C urve 25 50 75 100
90 95 100
264 242 220
135 140 150
66 44
0
125
150 TA (°C )
(2) SC59 (commonly known as SOT23 in Asia)
TA (°C) 25 50 60 70 80 85 90 100 110 120 130 140 150 PD (mW) 230 184 166 147 129 120 110 92 74 55 37 18 0
P D (m W ) 300
Pow er D issipation C urve
200
100
0 -400 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0
TA (°C)
AH375
Document number: DS31172 Rev. 6 - 2
4 of 9 www.diodes.com
July 2010
© Diodes Incorporated
Ordering Information
AH375
SINGLE PHASE HALL EFFECT LATCH
AH375 - X X - X
Package
P : SIP-3L W : SC59
Lead Free
L : Lead Free G : Green (Note 4)
Packing
A : Ammo Box (Note 7) B : Bulk (Note 8) 7 : Tape & Reel
Device AH375-PL-A
Bulk
Package Packaging
Part
Code (Note 5, 6) Quantity Number
Suffix
P
SIP-3L
NA
NA
7” Tape and Reel
Part
Quantity
Number
Suffix
NA NA
Ammo Box Part
Quantity Number Suffix
4000/Box -A
AH375-PL-B
P
SIP-3L 1000
-B
NA
NA NA NA
AH375-PG-A
P
SIP-3L
NA
NA
NA
NA 4000/Box .