AH375

AH375 SINGLE PHASE HALL EFFECT LATCH Description 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. The AH375 is available in SIP-3L and SC59 packages. Pin Assignments (Top View) 3. OUT 2. GND 1. Vdd SIP-3L (Top View) 3. OUT GND 2. 1. Vdd SC59 Applications • • • • Brush-Less DC Motor Brush-Less DC Fan Revolution Counting Speed Measurement 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) 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 RL C 1 AH375 2 3 Output GND AH375 Document number: DS31172 Rev. 6 - 2 1 of 9 www.diodes.com July 2010 © Diodes Incorporated 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 2 GND 3 2 OUT Absolute Maximum Ratings (TA = 25°C) Symbol Vdd B VDS Id TS TJ(MAX) PD θJC Characteristics Supply Voltage Magnetic Flux Density Output OFF Voltage Output “On” Current Storage Temperature Range Maximum Junction Temperature Package Power Dissipation Thermal Resistance Values 20 Unlimited 30 25 -65~+150 150 550 230 227 543 Unit V V mA °C °C mW °C/W Continuous SIP-3L SC59 SIP-3L SC59 Recommended Operating Conditions Symbol Vdd TA Notes: Parameter Supply Voltage (Note 2) Operating Ambient Temperature Conditions Operating Operating Min 2.2 -40 Max 20 125 Unit V °C 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. 2 of 9 www.diodes.com July 2010 © Diodes Incorporated AH375 Document number: DS31172 Rev. 6 - 2 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