SI-7502 SLA5011 SLA6503

Transcription

1 -phase Stepper Motor Pentagon Connection Driver ICs SI-0 SLA0 SLA0 Absolute maximum ratings Type No. Parameter Symbol Ratings Unit Motor supply voltage VCC V Auxiliary supply voltage VS V Control voltage Vb V SI-0 Reference voltage Vref. V Detected voltage V V Power dissipation PD W Ambient operating temperature TOP 0 to + C Drain source voltage VDSS 0 V Drain current ID ± A (Ta = C) SLA0 Avalanche energy proof quantity (Single pulse) EAS mj Power dissipation PT W Channel temperature Tch C Storage temperature Tstg 0 to + C Collector-Base voltage VCBO 0 V Controller-Emitter voltage VCEO 0 V Emitter-Base voltage VEBO V Collector current IC A SLA0 Collector current (Pulse) IC (pulse) A Base current IB A Power dissipation PT W Junction temperature Tj C Storage temperature Tstg 0 to + C

2 SI-0, SLA0 and SLA0 Electrical characteristics Type No. Parameter Symbol Limit min typ max Unit Condition ICC 0 ma VCC = V, Vb =.V Supply current Is. ma VS =.V Ib 0 ma Vb =.V Input current IIU-L, IIL-L. ma VIU = VIL = 0.V SI-0 Upper drive circuit drive current IOU-on ma Vb = V, AIU to EIU pin open IOU-off µa Vb = V Lower drive circuit voltage VOL-on VS. V Vb = V, AIL-EIL pin open VOL-off. V Vb = V Oscillation frequency F 0 0 khz Vb = V Detected current V 0..0 V Vb = V, Vref pin Gate threshold voltage VTH.0.0 V VDS = V, ID = 0µA Current transmission conductance Re(yfs).. S VDS = V, ID = A DC ON-resistance RDS(ON) Ω VGS = V, ID = A SLA0 Input capacity CISS 00 pf VDS = V, f =.0MHz, Output capacity COSS 0 pf VGS = 0V Di forward voltage between source and drain VSD.. V ISD = A Di reverse recovery time between source and drain trr ns ISD = ±0mA Collector cut-off current ICBO µa VCB = 0V SLA0 Collector emitter voltage VCEO 0 V IC = ma DC current gain hfe 000 VCE = V, IC = A Collector emitter saturation voltage VCE(sat). V IC = A, IB = ma Block diagram Control power supply Auxiliary power supply Main power supply Vb Vs Vcc Variable current resistor Excitation signal RX Reference voltage Trigger pulse generator circuit SI-0 Level shift current control unit SLA0 Motor Comparator amplifier SLA0 Current detection resistor Rs

3 SI-0, SLA0 and SLA0 Equivalent circuit diagram SI-0 0 R0 Trigger pulse generator circuit R R R R Tr R R Tr R R Tr R R Tr R R Tr R + R R R R R R0 Tr SLA0 R = KΩ Typ R = Ω Typ SLA0

4 SI-0, SLA0 and SLA0 External connection diagram VB (V) C + C + C + VS(V) VCC(~V) C C C C Di : 0 µ F/V : 0 µ F/V : µ F/V : 0pF : kω : RK- (Sanken) Excitation signal input Aiu Biu Ciu Diu Eiu Ail Bil Cil Dil Eil 0 0 SI-0 0 SLA0 SLA0 Ao Bo Co Do Eo Stepper motor Activ High PD RX C IO Di IO (typ) IOPD (typ) a R' = 0./ = (. a 0.0) / Rs = Vb R' / (0000+R') = 0 Rx / (0+Rx) External dimensions (Unit: mm) SI-0 SLA0/SLA0 Pin- marking (White dots) 0(max) pin (max) Lot No. SI - 0 # P. ±0. =.0 pin (max) R R pin pin #. ±0. R : 0.mm.0 ±0..0 ±0..min(.). φ. ±0.. ±0..max. Pin. ±0. a b.0 ±0.. ±0.. ±0... ±0.. ±0. JAPAN ±0. P. ±0. =. ±.0.max. Lead board thickness resin 0. max.. ± ±0. a : Type No. b : Lot No. 0

5 SI-0, SLA0 and SLA0 Application Note Determining the output current Io (motor coil current) The main elements that determine the output current are Current detection resistor Rs, Supply voltage Vb, and Variable current resistor RX. () Normal mode To operate a motor at maximum current level, set RX to infinity (open). From Fig. A, when the maximum output current ripple is designated as IOH, its value will be, VH IOH =... [A] VH can be computed as follows: VH = 0. x Vb 0.0 (center value)... [B] From equations [A] and [B], the output current IOH can be computed as follows: I IOH = (0. x Vb 0.0) The relationship between IOH and is shown in Fig. B. () Power down mode When an external resistor RX is connected, VH changes as shown in the Fig. C even when is retained. Obtain the power down output current IOHPD from Fig. C and equation [A]. Fig. A IOH O Waveform of output current Fig. B Output current vs. Current detection resistor Output current IOH (A) IOH(min) (Vb=V) IOH(max)= 0. Vb 0.0 Rs IOH(min)= 0. Vb 0.0 Rs IOH(max) (Vb=V) (Ω) Detection resistor Rs Fig. C Detection voltage vs. Variable current resistor Detection voltage VH (V) RX VH(max)= Vb RX VH(min)=. RX Vb RX VH(max) (Vb=V) VH(min) (Vb=V) Relation between Output Current Io (Control Current) and Motor Winding Current The SI-0 adopts the total current control system; therefore, the output current Io is different from the motor winding current. In a general pentagonal driving system, the current flows as shown in Figure D. The relation between Io and is as follows: 0. 0 (KΩ) Variable current resistor Rx Fig. D Coil current flow at pentagonal driving Io = x The following relation is obtained depending on driving systems: Io = x VCC To SI-0 Detection resistor

6 SI-0, SLA0 and SLA0 Motor connection The -phase stepping motor supports various driving systems and the motor connection varies depending on those driving systems. In some driving systems, the use of the motor may be restricted by patents. Therefore, be sure to ask the motor manufacturer about the motor connection and driving system to be used. Thermal design The driver (SLA0/SLA0) dissipation varies depending on a driving system to be used even if those output currents (control current) are the same. Therefore, measure the temperature rise of the driver under the actual operation conditions and determine the size of heatsink. Figure E shows an SLA0/SLA0 derating curve. This derating curve indicates Tj = C; however, before using this device, set a margin and select a heatsink so that Tc < 0 C (Al FIN temperature on the back of the SLA) is obtained. Fig. E SLA0/SLA0 Derating curve (W) Power dissipation PT 0 0 mm AI Heatsink 0 0 mm AI Heatsink Without Heatsink ( C) Ambient temperature Ta