ATS177_10

ATS177 SINGLE OUTPUT HALL EFFECT LATCH Description ATS177 is an integrated Hall-Effect latch 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-collector output. An internal bandgap 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 (DO 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 ATS177 is available in SIP-3L package. Pin Assignments (Top View) 3. DO 2. GND 1. Vcc SIP-3L Applications • • • • Brush-less DC Motor Brush-less DC Fan Revolution counting Speed measurement Features • • • • • • • • • Bipolar Hall-Effect latch sensor 3.5V to 20V DC operating voltage Temperature compensation Open-collector pre-driver 25mA maximum output sink current Built-in reverse polarity protection Operating temperature: -40°C to +125°C SIP-3L package Green Molding Compound (No Br, Sb) (Note 1) 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. Notes: Typical Application Circuit +12V D1 R1 2K U1 L1 L2 R2 1 VCC OUTPUT GND 2 ATS177 3 Q1 NPN 3K + C1 0.47uF Q2 NPN + C2 0.47uF Brush-less DC Fan ATS177 Document number: DS31055 Rev. 6 - 2 1 of 9 www.diodes.com July 2010 © Diodes Incorporated ATS177 SINGLE OUTPUT HALL EFFECT LATCH Pin Descriptions Pin name Vcc GND DO P/I/O P P O Pin # 1 2 3 Description Positive power supply Ground Digital output Functional Block Diagram Vcc 1 Regulator Hall plate 3 2 DO Amp 2 GND Absolute Maximum Ratings (TA = 25°C) Symbol VCC VRCC B VCE PD IC TJ(MAX) TS Characteristics Supply Voltage Reverse VCC Polarity Voltage Magnetic Flux Density Output OFF Voltage Package Power Dissipation Output “ON” Current Maximum Junction Temperature Storage Temperature Range Rating 20 -20 Unlimited 30 550 25 150 -65~+150 Unit V V V mW mA °C °C SIP-3L Continuous Recommended Operating Conditions Symbol VCC TA Notes: Characteristic Supply Voltage Operating Ambient Temperature (Note 2) Conditions Operating Operating Min 3.5 -20 Max 20 85 Unit V °C 2. Shall not exceed PD and Safety Operation Area. ATS177 Document number: DS31055 Rev. 6 - 2 2 of 9 www.diodes.com July 2010 © Diodes Incorporated ATS177 SINGLE OUTPUT HALL EFFECT LATCH Electrical Characteristics (TA = 25°C) Symbol VCE (sat) Icex Icc tr tf Characteristic Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Falling Time Test Conditions VCC = 14V, Ic = 20mA VCE = 14V, VCC = 14V VCC = 20V, Output Open VCC = 14V, RL = 820Ω, CL = 20pF VCC = 14V, RL = 820Ω, CL = 20pF Min Typ. 300