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| SA276 BRUSH-LESS DC-FAN DRIVER WITH ON-CHIP HALL SENSOR DESCRIPTION SA276 mainly designed for electronic commutation of brush-less DC fan. This IC internally includes the Hall Plate, Regulator, Pre-Amplifier, Comparator, and a pair of complementary open-collector Outputs (DO, DOB). SA276 internally includes power-reverse protecting diode, the protecting diode only protects chips but not for coils. If necessary, add one external diode to block the reverse current from coils. TO - 94 12 34 FEATURES * On-chip hall sensor * Wide operating voltage: 3.5V to 20V * 400mA (avg) output sink current * Build-in power-reverse protecting diode only for reverse power connecting ORDERING INFORMATION Device SA276 Package TO-94 APPLICATIONS * Dual coils brush-less DC fan * Dual coils brush-less DC motor * Revolution counting * Speed measurement BLOCK DIAGRAM 2 4 PRE AMP DO GND DOB VCC 1 REG Hall 3 ABSOLUTE MAXIMUM RATINGS (Tamb=25C) Characteristics Supply Voltage Reverse Vcc Polarity Voltage Magnetic Flux Density Output Current On Continuous Hold Peak (start up) Iomax Symbol VCC Vrcc B Value 25 -25 Unlimited 400 500 700 Unit V V G mA mA mA HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV: 1.2 2008.09.27 Page 1 of 5 SA276 Characteristics Maximum Junction Temp Storage Temperature Range Operating Temperature Range Package Power Dissipation(Tamb85C) Maximum Jointing Temp t10s Symbol Tj Tstg Tamb Ptot Tsd Value 170 -55~+150 -25~+85 500 260 Unit C C C mW C ELECTRICAL CHARACTERISTICS (Tamb=25C, VCC=4.0V to 20V) Characteristics Supply Voltage Supply Current Low Supply Voltage Output Saturation Voltage Output Leakage Current Output Rise Time Output Falling Time Switch Time Differential Output Zener Breakdown Symbol Vcc Icc Vce Vce(sat) Icex tr tf t Vz VCC=20V, RL VCC=3.5V, IL=100mA VCC=12V, IL=300mA VCE=12V, VCC=12V VCC=12V, RL=820,CL=20pF VCC=12V, RL=820,CL=20pF VCC=14V, RL=820,CL=20pF Test Condition Min. 3.5 16 0.4 0.3 <0.1 3.0 0.4 3.0 40 0.5 10 10 2 10 Typ. Max. 25 25 Unit V mA V V A s s s V MAGNETIC CHARACTERISTICS Characteristics SA276-A Operate Point SA276-B SA276-C SA276-D SA276-A Release Point SA276-B SA276-C SA276-D SA276-A Hysteresis SA276-B SA276-C SA276-D Bhys Tamb=-20~+85C Brp Tamb=-20~+85C Bop Tamb=-20~+85C Symbol Test circuit Min. 0 0 ---50 -60 -80 -90 0 0 --Typ. ------------Max. 50 60 80 90 0 0 --100 120 160 180 G G G Unit HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV: 1.2 2008.09.27 Page 2 of 5 SA276 While the magnetic flux density B is larger than operate point Bop, DO will turn on and output low potential, DOB will turn off and output high potential. Each output is latched until the magnetic flux density B is lower than release point Brp, and then DO; DOB transfer each state. PIN CONFIGURATION SA276 1 VCC 2 DO 3 DOB 4 GND PIN DESCRIPTION Pin No. 1 2 3 4 Symbol VCC DO DOB GND Power supply Positive output Negative output Ground. Description HALL SENSOR LOCATION Unit X Y 1.75 1.35 mm mm TEST CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV: 1.2 2008.09.27 Page 3 of 5 SA276 TYPICAL APPLICATION CIRCUIT PACKAGE OUTLINE TO-94 UNIT: mm HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV: 1.2 2008.09.27 Page 4 of 5 |
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