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GENERAL DESCRIPTION

FS211
2 PHASE DC MOTOR DRIVE IC

The FS211, a 1-chip composed of hall sensor and output coil drivers, applied to 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 0.3A and operating voltage range is wide. FG signal, an open collector, provides a square waveform output for the detection of the motor speed. Using few external components, FS211,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: 4.0V~20V Output sink current up to 0.3A Low quiescent supply current under 5mA Built-in FG output Package : TO-92SP-4

TO-92SP-4

TYPICAL APPLICATION CIRCUIT

FTC
S211

FGtupO

Rev0.4 April.08, 2003 P1/FS211

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FUNCTIONAL BLOCK DIAGRAM

FS211

Regulator

Hall Sensor Pre-driver

AMP 3

MARK VIEW

PIN DESCRIPT ON
NAME NO. STATUS DESCRIPTION

FTC S211

FG

Rotation speed output (O.C.)

NO

O/P

Coil driver output It is low state during the N magnetic field. /Power input Coil driver output It is low state during the S magnetic field. /Power input IC Ground

SO

O/P

4
GND 4 P

Rev0.4 April.08, 2003 P2/FS211

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ABSOLUTE MAXIMUM RATINGS

FS211
35V 30V

Zener Breakdown Voltage (Vz) -----------------------------------------------------------NO/SO Pin Voltage (VCP(Note 1)) ---------------------------------------------------------

Peak Sink Current (Io) Hold Current-------------------------------------------------------------------------Continuous Current ---------------------------------------------------------------500mA 350mA

Peak Reverse Current (IR) -----------------------------------------------------------------

100mA

FG Pin OFF Voltage (VFG) -----------------------------------------------------------------

30V

FG Sink Current (IFG) ------------------------------------------------------------------------

10mA

Power Dissipation Ta=25J ----------------------------------------------------------------------------Ta=70J ----------------------------------------------------------------------------600mW 450mW -20oC -65 oC 85 oC 150 oC

Operating Temperature Range ---------------------------------------------------Storage Temperature Range ------------------------------------------------------

Junction Temperature -----------------------------------------------------------------------

+150 oC +230 oC

Lead Temperature (Soldering, 10 sec) --------------------------------------------------

Note 1: VCP mean Coil Power

Rev0.4 April.08, 2003 P3/FS211

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DC ELECTRICAL CHARACTERISTICS

FS211
TEST CONDITIONS MIN TYP MAX UNIT

PARAMETER

SYMBOL

Minimum Operating Voltage Maximum Operating Voltage Quiescent Supply current NO/SO Saturation Voltage FG OFF Leakage Current FG ON Saturation Voltage Note:

VCP VCP ICP VSAT IOFF VON

No use pin is open (Fig1) ICP 10mA No use pin is open (Fig1) No use pin is open VCP : 4.0V 20V (Fig1) Io = 300mA (Fig1) (Fig2) IC=5mA(Fig2)

4.0 20.0 2.0 7.0 1.5 1 0.2 0.5

V V mA V
g A

Fig1 The IC output state is under N magnetic field.

AC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Rise time Fall time Propagation delay time Response frequency

(tr) (t) (tPHL / tPLH )

RL=1K CL=10pF (Fig3) RL=1K CL=10pF (Fig3) RL=1K CL=10pF (Fig3)

500 500

nS nS
g S

kHz

Rev0.4 April.08, 2003 P4/FS211

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MAGNETIC CHARACTERISTICS

FS211
Ta= 20J 85J MAX UNIT G G 120

FS211-A PARAMETER Bop Brp Bhys MIN

TYP +60 -60

FS211-B PARAMETER Bop Brp Bhys MIN

Ta= TYP +90 -90

20J

85J MAX UNIT G G 180

VNO
V

VSO
V

-60 ( -90 NO ,

60 + +90) N IP

-60 ( -90 SO ,

60 + +90) N IP

Rev0.4 April.08, 2003 P5/FS211

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TEST CIRCUITS:

FS211

A V V

Fig 1 Test Circuit

A V
Fig 2 Test Circuit

A V
Fig 3 Test Circuit
Rev0.4 April.08, 2003 P6/FS211

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FUNCTION DESCRIPTIONS
Hall Sensor Location

FS211

The figure 4 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 (figure 5). For the 2-phase motor, this design is very important.

Y X Y 1.75 1.35

UNIT mm mm

Fig 4 FS211 Hall Sensor Location

S d

Fig 5 Magnetic Distribution

Rev0.4 April.08, 2003 P7/FS211

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Darlington-pair Transistor Output

FS211

The figure 6 is the circuit diagram of Darlington-pair transistor. Under the heavy current loading, the power loss of the high saturation voltage can be calculated into the following formula: Pc= (VBEQ1+VCE(SAT)Q2) * Io According to the IC package and the curve of the power loss, the Pc should be applied to and within the safety value. 30V is the voltage of Zener breakdown diode. However, if the voltage, excluding that of the power supply, is more than 30V under the long-time operation, the diode will be destroyed.

2,3

+ Q2 _ VCE(SAT)

Q1 + VBE _

Fig 6 Darlington-pair Transistor Output

Rev0.4 April.08, 2003 P8/FS211

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current and confirm the voltage level of rotation speed.

FS211
The situation of the long-time

FG Output: The Circuit Diagram of Open Collector Transistor

operation with the high voltage or with the high current will do damage to the transistor and cause FG malfunction. Figure 8 illustrates the relation between dynamic magnetic field and FG.

VC R uup reitance P -l s s

FG output

Fig 7 FG Circuit Diagram

N pole 0 S pole

VFG (Depnd on suply voltage) 0V

Fig 8 FG Waveform

Rev0.4 April.08, 2003 P9/FS211

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APPLICATION NOTE
The Example of Typical Application Circuit

FS211

Figure 9 is the example of typical application circuit. 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. Rc is an external pull-up resistance for the use of measuring FG signal. In view of the design,the value of Rc could be decided by the transistor saturation voltage(VON),sink current(IC),and off-level voltage(VC). The formula is: For example: Vc = +5V for TTL level. Ic = 5mA at 0.5V saturation voltage (IC specification.) The safety value of Rc= 1K[ RC=(VC-VON) / IC

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 caused during the transient of the output stages. The volume of the ripple noise depends on the coil impedance and characteristics.

VCC D1

R wire

VC

C1

RC FG OUTPUT Y wire

IC FG

L1

L2

FS211

NO SO

B wire

Internal circuit of 2-phase DC motor

Fig 9 Application Circuit

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PACKAGE OUTLINE
.22 .50 5 0 .206 0( .2) 00

FS211
23 de

g.

2-

2-0.3C 2-0.12C) ( 0

5 de

g.

.2.1 4 0 .16.)40 0( 05

1.55 .50 0 .1 0( 60 .2) 00 .37 .30 0 0 .29 0( 0 .12) 00

.56 3 .144 0(

0 .50 00 .2)

.754 0 .18 0( 0

.25 00 .1) 00

15.3 0

mm (inch) 1.27 .25 00 ..1) 0( 05 0 .1 0 83 .15 0( 0 .25 00 .1) 00 .1 0 83 .15 0( 0 .13 00 . 50 0 )

Rev0.4 April.08, 2003 P11/FS211

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PACKING SPECIFICATIONS BAG & BOX DIMENSION

FS211

160mm

FT C L o go

100mm

200mm

BA

GL A B E L
O X B AL B E L

630mm

AB

G 190mm N SI DE O X I B

400m m

650m m

240m m

C A R TO N LA B EL

FTC Logo

C A R TO N

Rev0.4 April.08, 2003 P12/FS211