Ordering number : EN7947B
Monolithic Digital IC
LB11948T
Overview
PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver
The LB11948T is a low saturation voltage output PWM current control bipolar drive stepping motor driver. It is optimal for use as the driver for the miniature low-voltage stepping motors used in portable electronic equipment such as portable thermal printers.
Features
• PWM current control (external excitation) • Simultaneous on state prevention function (through current prevention) • Thermal shutdown circuit • Noise canceller function • Low-power mode control pin
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter VS supply voltage Logic system supply voltage Peak output current Continuous output current Emitter output voltage Input voltage Allowable power dissipation Operating temperature Storage temperature Note * : Specified PCB : 114.3×76.1×1.6mm Symbol VS VCC IO peak IO max VE VIN Pd max Topg Tstg Mounted on the specified PCB* tW ≤ 20μS Conditions Ratings -0.3 to +18 -0.3 to +18 0.5 0.4 1.0 -0.3 to VCC 1.2 -20 to +85 -40 to +150 Unit V V A A V V W °C °C
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment.
D2607 MS PC 20060201-S00001/N2206/D1504TN(OT)/81004TN(OT) No.7947-1/13
LB11948T
Recommended Operating Conditions at Ta = 25°C
Parameter VS supply voltage VCC supply voltage Reference voltage Symbol VS VCC VREF VCC ≤ 4V VCC > 4V Conditions Ratings 3.0 to 15 3.0 to 15 0.0 to 1.0 0.0 to 1.5 Unit V V V V
Electrical Characteristics Ta = 25°C, VS = VCC = 5V, VREF = 0.3V
Parameter [Output Block] VS system supply current IVS OFF IVS ON IVS wt Output saturation voltage 1 Output saturation voltage 2 Output saturation voltage 3 Output saturation voltage 4 Output leakage current VO (sat) 1 VO (sat) 2 VO (sat) 3 VO (sat) 4 IO1 (leak) IO2 (leak) Upper and lower side output diodes Forward voltage 1 (upper side) Forward voltage 2 (lower side) [Logic Block] VCC system supply current ICC OFF ICC ON ICC wt Input voltage VI on VI off Input current Reference voltage : 1V Current setting reactive current Reference current CR pin current 1 CR pin current 2 Sense voltage 1 Thermal shutdown temperature * Note * : Design guarantee value IIN V1V IE IREF ICR1 ICR2 VSEN1 TS VREF = 0.3V, VE = 0.3V CR = 0.5V CR = 3V VREF = 0.5V * VIN = 5V IO = 1mA 70 0.95 -22 -1 -2 1.65 0.475 2.2 0.5 170 2.75 0.525 100 1 -17 PH1 = PH2 = 0V, EN1 = EN2 = 3.0V, ST = 3.0V PH1 = PH2 = EN1 = EN2 = 0V, ST = 3.0V PH1 = PH2 = EN1 = EN2 = ST = 0V 2.0 0.8 130 1.05 -10.5 6.5 7 10 11 13.5 15 1 mA mA μA V V μA V mA μA μA mA V °C VF1 VF2 I = 400mA I = 400mA 0.9 0.9 1.1 1.1 1.3 1.3 V V PH1 = PH2 = 0V, EN1 = EN2 = 3.0V, ST = 3.0V PH1 = PH2 = EN1 = EN2 = 0V, ST = 3.0V PH1 = PH2 = EN1 = EN2 = ST = 0V IO = +0.2A (source) IO = +0.4A (source) IO = -0.2A (sink) IO = -0.4A (sink) VO = VBB (sink) VO = 0V (source) -50 0.2 0.3 0.2 0.3 28 40 5 52 1 0.4 0.5 0.4 0.5 50 μA mA μA V V V V μA μA Symbol Conditions min Ratings typ max Unit
Truth Table
Channel 1 Input ST H H H L PHASE1 L H * * Input ENABLE1 L L H * OUT1H L OFF OFF Output OUT1 L H OFF OFF PHASE2 L H * * Input ENABLE2 L L H * OUT2H L OFF OFF Channel 2 Output OUT2 L H OFF OFF
Note * : Levels shown as an asterisk (*) can be set to be either high or low.
No.7947-2/13
LB11948T
Package Dimensions
unit : mm (typ) 3259
1.4
9.75 30 16
Pd max -- Ta
Specified PCB : 114.3×76.1×1.6mm PCB material : glass epoxy
Allowable power dissipation, Pd max – W
1.2
1.0
5.6
7.6
0.8 0.62
0.5
0.6
1 0.65 (0.33) 0.22
15 0.15
0.4
(1.0) 1.2max
0.2 0 – 20
0.08
0
20
40
60
80 85
100
Ambient temperature, Ta – °C
SANYO : TSSOP30(275mil)
Pin Assignment
Top view
No.7947-3/13
LB11948T
Pin Functions
Pin No. 1 2 3 4 5 6 Pin Name OUT1OUT1 NC NC D-GND E1 Output Output Unused Unused Lower side internal diode anode connection Constant current control sensing The motor current is set by the value of the sensing resistor Re connected between the E1 pin and ground. The current is set according to the following equation : IO = VREF/Re (A) 7 8 9 10 11 12 13 14 VS1 NC VCC CR VREF1 NC ENABLE1 PHASE1 VS power supply Unused VCC power supply RC oscillator connection Current setting system reference voltage input VREF1 voltage range : 0 to 0.5V Unused Output is turned on when ENABLE1 is low, and the output is turned off (operating state) when ENABLE1 is high. Logic level input : phase switching When PHASE1 = high : Output pin states : OUT1 : high, OUT1- : low. When PHASE1 = low : Output pin states : OUT1 : low, OUT1- : high. 15 ST Standby mode setting When ST = high : the IC operates in normal operating mode. When ST = low : the IC operates in standby mode. The VS and VCC current drain levels are under 1μA in this mode. 16 17 NC 1VREG Unused 1V regulator circuit output The LB11948 includes an internal 1V regulator circuit, and this pin is the output from that circuit. The VREF1 and VREF2 reference voltages can be set by voltage dividing the 1V regulator output. 18 PHASE2 Logic level input : phase switching When PHASE2 = high : Output pin states : OUT2 : high, OUT2- : low. When PHASE2 = low : Output pin states : OUT2 : low, OUT2- : high. Output is turned on when ENABLE2 is low, and the output is turned off (operating state) when ENABLE2 is high. Current setting reference voltage input VREF2 voltage range : 0 to 0.5V 21 22 23 24 25 GND PGND NC VS2 E2 Ground (small signal circuit system ground) Power system ground (high current circuit system ground) Unused VS power supply Constant current control sensing The motor current is set by the value of the sensing resistor Re connected between the E2 pin and ground. The current is set according to the following equation : IO = VREF/Re (A) 26 27 28 29 30 D-GND2 NC NC OUT2 OUT2Lower side internal diode anode connection Unused Unused Output Output Description
19 20
ENABLE2 VREF2
No.7947-4/13
LB11948T
Block Diagram
10μF
VCC
VS1
ENABLE1 OUT1 Stepping Motor
OUT1PHASE1
E1
Control block
Blanking time + -
ENABLE2
VS2
OUT2
PHASE2 OUT2-
ST Blanking time + -
E2
S-GND
Thermal shutdown circuit
Reference voltage OSC VCC VREF2 56kΩ
P-GND
P-GND
1VREG
CR
VREF1
10kΩ 30kΩ
680pF
1Ω
1Ω
No.7947-5/13
10μF
LB11948T
Sample Application Circuit
1 OUT1-
OUT2- 30 OUT2 29 NC 28 NC 27 D-GND2 26 1Ω E2 25 VS2 24 NC 23 PGND 22 GND 21 VREF2 20
M
2 OUT1 3 NC 4 NC 5 D-GND
1Ω 8V
6 E1 7 VS1
10μF
5V 56kΩ 680pF
9 VCC 10 CR 11 VREF1 12 NC
LB11948T
10μF
8 NC
ENABLE2 19 Logic level input PHASE2 18 1VREG 17
16
Logic level input
13 ENABLE1 14 PHASE1 15 ST
30kΩ 10kΩ
Logic level input PHASE1 PHASE2
90 deg
200 Hz
No.7947-6/13
LB11948T
Drive Sequence Table 2 Phase Excitation Drive Sequence Table 1 Clockwise drive
No. 0 1 2 3 PHASE1 0 1 1 0 ENABLE1 0 0 0 0 OUT1 0 1 1 0 OUT11 0 0 1 PHASE2 0 0 1 1 ENABLE2 0 0 0 0 OUT2 0 0 1 1 OUT21 1 0 0
Table 2 Counterclockwise drive
No. 0 1 2 3 PHASE1 0 1 1 0 ENABLE1 0 0 0 0 OUT1 0 1 1 0 OUT11 0 0 1 PHASE2 1 1 0 0 ENABLE2 0 0 0 0 OUT2 1 1 0 0 OUT20 0 1 1
1-2 Phase Excitation Drive Sequence Table 3 Clockwise drive
No. 0 1 2 3 4 5 6 7 PHASE1 0 0 1 1 1 1 0 0 ENABLE1 0 0 1 0 0 0 1 0 OUT1 0 0 OFF 1 1 1 OFF 0 OUT11 1 OFF 0 0 0 OFF 1 PHASE2 0 0 0 0 1 1 1 1 ENABLE2 1 0 0 0 1 0 0 0 OUT2 OFF 0 0 0 OFF 1 1 1 OUT2OFF 1 1 1 OFF 0 0 0
Table 4 Counterclockwise drive
No. 0 1 2 3 4 5 6 7 PHASE1 0 0 1 1 1 1 0 0 ENABLE1 0 0 1 0 0 0 1 0 OUT1 0 0 OFF 1 1 1 OFF 0 OUT11 1 OFF 0 0 0 OFF 1 PHASE2 1 1 1 1 0 0 0 0 ENABLE2 1 0 0 0 1 0 0 0 OUT2 OFF 1 1 1 OFF 0 0 0 OUT2OFF 0 0 0 OFF 1 1 1
No.7947-7/13
LB11948T
2 Phase Excitation Drive Sequence
Clockwise drive
0
1
2
3
4
5
6
7
PHASE1
PHASE2
ENABLE1
ENABLE2
OUT1
OUT1-
OUT2
OUT2-
Counterclockwise drive
0
1
2
3
4
5
6
7
PHASE1
PHASE2
ENABLE1
ENABLE2
OUT1
OUT1-
OUT2
OUT2-
No.7947-8/13
LB11948T
1-2 Phase Excitation Drive Sequence
Clockwise drive
0
1
2
3
4
5
6
7
PHASE1
PHASE2
ENABLE1
ENABLE2
OUT1
OUT1-
OUT2
OUT2-
: Output off state
Clockwise drive
0
1
2
3
4
5
6
7
PHASE1
PHASE2
ENABLE1
ENABLE2
OUT1
OUT1-
OUT2
OUT2-
: Output off state
No.7947-9/13
LB11948T
Switching Operation Timing Chart
OUTA
OUTA
IO
Spike noise
E1
CR
tn
tn: The noise canceller operating time
No.7947-10/13
LB11948T
Usage Notes (1) Simple Formulas for Determining Resister and Capacitor Values The formula for setting the rising time (T1) and the falling time (T2) for the RC oscillator are shown below. (Refer to Fig. 1)
T2 V2
V1 T1
Fig. 1 Formulas Oscillation period T = T1+T2 (sec) Threshold voltages V1 = ((VCC - Vset1) × 10.7k/48.7k) + Vset1 (V) V2 = ((VCC - Vset2) × 42.7k/80.7k) + Vset2 (V) Vset1 : VCE voltage of transistor for internal comparator hysteresis = 0.05V Vset2 : VCE voltage of reference resistance switching transistor of oscillation circuit = 0.1V When charging : T1 = -C × R × ln {(VCC - V2)/(VCC - V1)} (sec) When discharging : T2 = -C × Rin × ln (V1/V2) (sec) Rin : Internal discharge resistance of the CR pin1.3kΩ C : External capacitor R : External resistor Oscillation frequency Fc = 1/T (Hz)
The T2 fall time serves as the noise canceling time (Tn). This time is a forced-on time for the output, and the output is not turned off even when the E pin voltage is higher than the sense voltage that has been preset by VREF.
No.7947-11/13
LB11948T
(2) Constant current settings The reference voltages of the VREF1 and VREF2 pins can be set by dividing the resistance voltage from the 1V regulator output pin (1VREG). The output current is set using the VREF reference voltage applied to the VREF1 and VREF2 pins and the Re resistor connected between the E1 and E2 pins and ground. The bias current of the output transistor also flows from the E pins so that the Iout output current flowing to the motor is reduced by an amount equivalent to the bias current. In addition, in controlling the constant current, the voltage is sensed by the E pins (pad area on IC chip) so that the amount equivalent to the wire bonding resistance (rw) from the pad to the package pins is added to the current sensing resistance (Re). Therefore, the formula for calculating the current setting is as shown below. (Refer to Fig. 2) IOUT = VREF / (Re + rw) - Ibias [A]
Re : Sensing resistance of resistor connected between E pins and ground rw : Amount equivalent to wire bonding resistance from pad to pins rw = 50 - 100mΩ Ibias : Output transistor bias current The Ibias current corresponds to the current setting reactive current (IE) in the specifications for the electrical characteristics. Current setting reactive current IE ratings : Min : -22mA Typ : -17mA Max : -10.5mA
IO
Ibias
Sense current : Ie = IO+Ibias Wire (rw)
IC E1 pin
Re
VREF
IC VREF1 pin
Fig. 2 (3) VREF pins The VREF pins are the reference voltage input pins for the preset current, so take special care to ensure that they are not affected by noise. If these pins will be affected by noise, connect a capacitor to VREF1 and VREF2 pins.
(4) Notes on the Ground Pins Since this IC switches large currents, the following notes on ground lines must be observed. • The PCB pattern lines in areas that handle large currents must be as wide as possible so as to have low impedances, and must be kept as far as possible from the small signal systems. • The ground terminals on the sensing resistors Re connected to the E pins (E1 and E2) must be connected as close as possible to the IC GND (pin 21), PGND (pin 22), or DGND (pins 5 and 26) pins as possible. • The capacitors between VCC and ground and between VBB and ground must be as close as possible to the corresponding VCC and VBB pin in the pattern.
No.7947-12/13
LB11948T
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This catalog provides information as of December, 2007. Specifications and information herein are subject to change without notice. PS No.7947-13/13
