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| Ampson Technology, Inc. A277 COMPLEMENTARY OUTPUT HALL EFFECT LATCHED SINK DRIVER FEATURES ! ! ! ! ! ! On-chip Hall sensor with two different sensitivity and hysteresis settings for A277. Internal bandgap regulator allows temperature compensated operations and a wide operating voltage range. High output sinking capability up to 400mA for driving large load. Lower current change rate reduces the peak output voltages during switching. Build in protection diode for chip reverse power connecting. Available in die form or rugged low profile 4 pin SIP packages. GENERAL DESCRIPTION A277 are integrated Hall sensors with output drivers designed for electronic commutation of brushless 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 complementary open-collector drivers for sinking large current loads. An internal bandgap regulator is used to provide temperature compensated supply voltage for internal circuits and allows a wide operating supply range. If a magnetic flux density larger than threshold Bop, DO is turned on(low) and DOB is turned off (high). The output state is held until a magnetic flux density reversal falls below Brp causing DO to be turned off and DOB turned on. A277 are rated for operation over temperature range from -20 oC to 85 oC and voltage range from 3.5V to 20V. The devices are available in low cost die forms or rugged 4 pin SIP packages. 1/6 12/26/2001 REV.1.0 Ampson Technology, Inc. APPLICATIONS ! ! ! ! Brushless DC Motor Brushless DC Fan Revolution Counting Speed Measurement A277 FUNCTIONAL BLOCK DIAGRAM VCC 1 2 REG. OUTPUT(DO) HALL SENSOR 3 OUTPUT(DOB) 4 VSS PIN DESCRIPTION 277 XXX 1 : VCC 2 : DO 3 : D0B 4 : VSS 123 4 REMARK : XXX : DATE CODE ( ex : 52Z ) 52 : WEEK ( ex=>52:52 WEEK . 35:35 WEEK ) Z : YEAR ( ex=>Z:DC2001 , Y:DC2002 , X:DC2003 ) Name Vcc DO DOB Vss P/I/O P O O P Pin # 1 2 3 4 Description Positive Power Supply Output Pin Output Pin Ground 2/6 12/26/2001 REV.1.0 Ampson Technology, Inc. ABSOLUTE MAXIMUM RATING ( at Ta=25 oC ) Supply Voltage, Vcc --------------------------------- 20V Reverse VCC Polarity Voltage, VRCC-------------- -35V Magnetic flux density, B ---------------------------- Unlimited Output OFF Voltage, Vce -------------------------- 50V(Note 1) Output ON Current, Ic Continuous -------------------------------- 400mA Hold-------- --------------------------------- 500mA Peak (Start Up) --------------------------- 700mA Operating Temperature Range, Ta -------------------------------------------- (-20 oC to +85 oC) Storage Temperature Range, Ts--------------------------------------------- (-65 oC to +150 oC) Package Power Dissipation, Pd -------------------------------------------- 500mW Maximum Junction Temp , Tj----------------------- 175 oC (Note1) Output Zener protection voltage. A277 ELECTRICAL CHARACTERISTICS ( Ta =+25 oC , Vcc=4.0V to 20V ) Characteristic Symbol Conditions Min Low Supply Voltage Vce Vcc=3.5V, IL=100mA -- Supply Voltage Vcc -- 3.5 Output Saturation Voltage Vce(sat) Vcc=14V, IL=300mA -- Output Leakage Current Icex Vce=14V, Vcc=14V -- Supply Current Icc Vcc=20V, Output Open -- Vcc=14V, RL=820, Output Rise Time tr -- CL=20pF Vcc=14V, RL=820, Output Falling Time tf -- CL=20pF Vcc=14V, RL=820, Switch Time Differential t -- CL=20pF Typ Max Units 0.4 -- V -- 20 V 300 600 mV < 0.1 10 uA 13 20 mA 3.0 0.3 3.0 10 1.5 10 us us us 3/6 12/26/2001 REV.1.0 Ampson Technology, Inc. MAGNETIC CHARACTERISTICS Characteristic Operate Point Release Point Hysteresis Symbol Bop Brp Bhys Ta=+25 oC Min Max 0 -70 40 70 0 110 A277 Ta=0 oC to 70 oC Units Min Max 0 -70 20 70 0 140 G G G TEST CIRCUIT 14V Vout1(DO) RL1 Vout2(DOB) RL2 RL1=RL2=820 Ohm CL1=CL2=20 pF CL1 CL2 4/6 12/26/2001 REV.1.0 Ampson Technology, Inc. HYSTERESIS CHARACTERISTICS A277 DOB Output Voltage in Volts RP OFF Output Voltage in Volts 12 10 8 6 4 ON -200 -100 0 2 100 OP 200 OFF A277 DO 12 10 8 6 4 RP -200 -100 0 2 100 ON 200 OP Magnetic Flux Density in Gauss Magnetic Flux Density in Gauss Power Dissipation VS. Environment Temperature Ta (oC) Pd (mW) 25 50 60 70 80 85 90 95 100 105 110 115 120 550 525 515 505 485 475 465 455 445 425 405 385 365 P o w e r D is s ip a tio n C u rv e 600 500 400 300 200 100 0 25 50 75 100 125 150 T a (C ) P d (m W ) NoteTO92 4 pin (SIP-4L) package. 5/6 12/26/2001 REV.1.0 Ampson Technology, Inc. PACKAGE INFORMATION Active Area Depth Package Sensor Location A277 1.96mm Top View Marking Site 0.7mm 1.482mm Top View 1 2 3 4 PACKAGE DIMENSION 5o -7o 14.25mm +/-1.25mm 1.55mm +/-0.1mm 0.85mm +/-0.1mm 3o -5 o 0.30mm +/-0.1mm 0.38mm +/-0.03mm 3.65mm +/-0.1mm 0.46mm +/-0.03mm 0.38mm +/-0.03mm 5.22mm +/-0.1mm 4.20mm +/-0.1mm Marking Site 5o -7 o 3o -5o 1.27mm +/-0.03mm REMARK: XXX(DATE CODE) 6/6 12/26/2001 REV.1.0 3.81mm +/-0.03mm 277 XXX |
Price & Availability of A277
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