SA276 SILAN | Alldatasheet

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HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV: 1.2 2008.09.27 Http: www.silan.com.cn Page 1 of 5 BRUSH­LESS DC­FAN DRIVER WITH ON­CHIP HALL SENSOR TO ­ 94 1 2 3 4

DESCRIPTION

SA276 mainly designed for electronic commutation of brush­less DC fan. This IC internally includes the Hall Plate, Regulator, Pre­Amplifier, Comparator, and a pair of complementary open­collector 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.

FEATURES

  • On­chip hall sensor * Wide operating voltage: 3.5V to 20V * 400mA (avg) output sink current * Build­in power­reverse protecting diode only for reverse power connecting

APPLICATIONS

  • Dual coils brush­less DC fan * Dual coils brush­less DC motor * Revolution counting * Speed measurement

ORDERING INFORMATION

SA276 TO­94 BLOCK DIAGRAM REG Hall 41VCC DO DOB GND PRE AMP ABSOLUTE MAXIMUM RATINGS (Ta mb=25°C) Characteristics Symbol Value Unit Supply Voltage VCC 25 V Reverse Vcc Polarity Voltage Vrcc ­25 V Magnetic Flux Density B Unlimited G Continuous 400 mA Hold 500 mAOutput On Current Peak (start up) Iomax 700 mA

HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV: 1.2 2008.09.27 Http: www.silan.com.cn Page 2 of 5 Characteristics Symbol Value Unit Maximum Junction Temp Tj 170 °C Storage Temperature Range Tstg ­55~+150 °C Operating Temperature Range Ta mb ­25~+85 °C Package Power Dissipation(Ta mb≤ 85°C) Ptot 500 mW Maximum Jointing Temp t≤ 10s Tsd 260 °C ELECTRICAL CHARACTERISTICS (Ta mb=25°C, VCC=4.0V to 20V) Characteristics Symbol Test Condition Min. Typ. Max. Unit Supply Voltage Vcc 3.5 25 V Supply Current Icc VCC=20V, RL ’ 16 25 mA Low Supply Voltage Vce VCC=3.5V, IL=100mA 0.4 V Output Saturation Voltage Vce(sat) V CC=12V, IL=300mA 0.3 0.5 V Output Leakage Current Icex VCE=12V, VCC=12V <0.1 10 µ A Output Rise Time tr VCC=12V, RL=820Ω ,CL=20pF 3.0 10 µ s Output Falling Time tf VCC=12V, RL=820Ω ,CL=20pF 0.4 2 µ s Switch Time Differential Δ t VCC=14V, RL=820Ω ,CL=20pF 3.0 10 µ s Output Zener Breakdown Vz 40 V MAGNETIC CHARACTERISTICS Characteristics Symbol Test circuit Min. Typ. Max. Unit SA276­A 0 ­­ 50 SA276­B 0 ­­ 60 Operate Point SA276­D Bop Ta mb=­20~+85°C ­­ ­­ 90 G SA276­A ­50 ­­ 0 SA276­B ­60 ­­ 0 Release Point SA276­D Brp Ta mb=­20~+85°C G SA276­A 0 ­­ 100 SA276­B 0 ­­ 120 Hysteresis SA276­D Bhys Ta mb=­20~+85°C ­­ ­­ 180 G

HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV: 1.2 2008.09.27 Http: www.silan.com.cn Page 3 of 5 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 VCC SA276 1 2 3 4 DO DOB GND PIN DESCRIPTION Pin No. Symbol Description

1 VCC Power supply

2 DO Positive output

3 DOB Negative output

4 GND Ground. HALL SENSOR LOCATION Unit X 1.75 mm Y 1.35 mm TEST CIRCUIT

HANGZHOU SILAN MICROELECTRONICS CO.,LTD REV: 1.2 2008.09.27 Http: www.silan.com.cn Page 4 of 5 TYPICAL APPLICATION CIRCUIT PACKAGE OUTLINE TO­94 UNIT: mm