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rev0.2 nov. 09, 2004(lf) p 1 /fs276 general description the fs276, a 1-chip composed of hall sensor a nd output coil drivers, applied to a 2-phase dc motor. the high sensitivity of hall effect sensor is suitable for motors from mini-type cpu coolers to blowers and dc fans. typical operation current is 0.4a and operating voltage range is from 3.0v ~ 20v. using few external components, fs276, a high performance integrated ic, is designed for a 2-phase dc motor circuit. the circuit diagram of the typical application example is as below. features ? 1 chip hall sensor/drivers ? wide operating voltage range: 3.0v~20v ? output sink current up to 0.4a ? package : to-92sp-4 typical application circuit to-92sp-4 vcc ftc s276 pb free
rev0.2 nov. 09, 2004(lf) p 2 /fs276 functional block diagram regulator 4 2 3 1 amp hall sensor pre-driver mark view pin description name no. status description vcc 1 p ic power supply no 2 o coil driver output it is low state during the n magnetic field. so 3 o coil driver output it is low state during the s magnetic field. gnd 4 p ic ground ftc s276. 1 2 3 4
rev0.2 nov. 09, 2004(lf) p 3 /fs276 absolute maximun ratings ( at ta = 25 o c ) zener breakdown voltage (vz) ---- ------------ ------------ ------------ ------------ ------- 35v no/so pin voltage(off) ------------------------------------------------------------------- 30v vcc pin voltage ---------- ------------- ------------ ------------ ------------ ------------ ------- 20v peak sink current (io) peak current------------------------------------------------------------------------- 1a Q 100us hold current---------- ------------ ------------ ------------ ------------ ------------ ---- 600ma continuous current ---------------------------------------------------------------- 400ma power dissipation ta=25 o c ------------ ------------ ------------ ------------ ------------ ------------ ------ 700mw ta=95 o c ------------ ------------ ------------ ------------ ------------ ------------ ------ 450mw thermal resistance ja = ----------------------------------------------------------------------------------- 0.15 o c/mw operating temperature range ---- ------------- ------------ ------------ ----------- -20 o c to +85 o c storage temperature range ------ ------------ ------------ ------------ ------------ - -65 o c to +150 o c junction temperature ----------------------------------------------------------------------- +150 o c lead temperature (soldering, 10 se c) ------------ ------------ ------------ ---------- ---- +260 o c room temp 2 ~ 5 / sec 2 ~ 5 / sec 150 10 90 30 sec 255 5 10 1 sec second soldering condition c o c o c o c o
rev0.2 nov. 09, 2004(lf) p 4 /fs276 dc electrical characteristics (at ta = 2 5 o c) parameter symbol test conditions min typ max unit operating voltage v cc no use pin is open (fig1) 3 - 20 v quiescent supply current i cc no use pin is open v cc : 3v to 20v (fig1) - 18 20 ma output leakage current i leak vcc=12v, vce=20v - <0.1 10 ua no/so saturation voltage v sat io = 400ma - 400 800 mv ac eletrical characteristics parameter symbol test conditions min typ max unit rise time (t r ) rl=100ohm(5w) cl=20pf (fig1) 0.1 0.3 us fall time (t ? ) rl=100ohm(5w) cl=20pf (fig1) 100 180 ns
rev0.2 nov. 09, 2004(lf) p 5 /fs276 magnetic characteristics (1mt = 10gauss) FS276LF-A ta = -20 o c to +85 o c parameter symbal min. typ max. unit operate point bop +5 +60 gauss release point brp -60 -5 gauss hysteresis bhys 60 gauss fs276lf-bu ta = -20 o c to +85 o c parameter symbal min. typ max. unit operate point bop +80 gauss release point brp -80 gauss hysteresis bhys 60 gauss fs276lf-c ta = -20 o c to +85 o c parameter symbal min. typ max. unit operate point bop +100 gauss release point brp -100 gauss hysteresis bhys 60 gauss fs276 magnetic hysteresis characteristics output voltage in voltage output voltage in voltage
rev0.2 nov. 09, 2004(lf) p 6 /fs276 test circuits: fig 1 ftc s276 vcc rl1 rl2 cl1 cl2 vout2 vout1 rl1=rl2=100 ohm cl1=cl2=20 pf
rev0.2 nov. 09, 2004(lf) p 7 /fs276 typical characteristics vcc - v 0 20 45 -20 40 35 30 25 20 15 10 40 60 80 100 temperature - figure 4 bop - gauss - 45 - 40 - 35 - 30 - 25 - 20 - 15 - 10 369121520 c o figure 2 brp - gauss 75 70 65 60 55 50 45 40 -20 20 40 60 80 100 temperature - c o figure 6 bhys - gauss -20 20 40 60 80 100 temperature - c o figure 5 brp - gauss - 50 - 45 - 40 - 35 - 30 - 25 - 20 - 15 vcc - v 0 3 6 9 12 15 20 figure 3 72 70 68 66 64 62 60 58 bhys - gauss vcc - v 0 3 6 9 12 15 20 figure 1 45 40 35 30 25 20 15 10 bop - gauss
rev0.2 nov. 09, 2004(lf) p 8 /fs276 function descriptions hall sensor location the fig 2 is the hall sensor location, where marks the ic number. the best sensitivity, which can be intensified as much as possible, depends on the vertical distance and position between magnetic pole and the hall sensor (fig 3). for the single-phase motor, this design is very important. fig 2 fs276 hall sensor location n s d d1: hall sensor to case is 0.52mm fig 3 magnetic distribution and z-axis position
rev0.2 nov. 09, 2004(lf) p 9 /fs276 application note the example of typical application circuit fig 4 is the example of typical application ci rcuit. the red, yellow, and black wires are the input points of the motor system: red, the input of power supply; yellow, the output of fg; black, the ground signal. r c is an external pull-up resistance for the use of measuring fg signal. in view of the design, the value of r c could be decided by the transistor saturation voltage (v on ), sink current (i c ), and off-level voltage (v c ). the formula is: r c = c on c i v v ? for example: v c = +5v for ttl level. i c = 10ma at 0.2v saturation voltage the safety value of r c = 470 [ d1 is the reverse protection diode. as if the red and black wires reversely connect with the power source, the current will flow through the ground via ic and coils l1 and l2 to power supply. under such kind of circumstances, the ic and coils are easy to be burned out. therefore, d1, the reverse protection diode, is necessary for the design. however, d1 will also cause an extra voltage drop on the supply voltage. c1 is a capacitor to reduce the ripple noise ca used during the transient of the output stages. the volume of the ripple noise depends on the coil impedance and characteristics. fig 4 application circuit
rev0.2 nov. 09, 2004(lf) p 10 /fs276 package outline (lead free) unit:mm 2 - 3 d e g . 2 - 5 d e g . 3 . 6 6 0 . 1 2 15.01.0
rev0.2 nov. 09, 2004(lf) p 11 /fs276 packing specifications bag & box dimension carton label ftc logo 240mm 400mm 650mm carton packing quantity specifications 1000 ea/1 bag 25 bags/1 inside box 4 inside boxes/1 carton bag bag label 160 mm 200 mm box label 190 mm 630 mm 100 mm ftc logo inside bo x
rev0.2 nov. 09, 2004(lf) p 12 /fs276 label specification bag lebal,inside box & carton label order information part number operating temperature package description FS276LF-A -20 o c to 85 o c to-92sp-4 60g (b) fs276lf-bu -20 o c to 85 o c to-92sp-4 08g (b) fs276lf-c -20 o c to 85 o c to-92sp-4 100g (b) feeling technology corp. product type: fs276lf- x lot no: xxxxxxxx date code: xxx package type: sip- 4l marking type: xxxxx tatal q'ty: xxxxx 7.5 cm 5.5 cm l1] lead free

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