Document
Ordering number : EN7633A
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Monolithic Digital IC
LB1945D
Overview
PWM Current Control
Stepping Motor Driver
The LB1945D is a PWM current control stepping motor driver that uses a bipolar drive technique. It is optimal for use with the carriage and paper feed stepping motors used in printers.
Functions and Features
• PWM current control (external clock) • Digital load current selection function (supports 1-2, W1-2, and 2-phase excitation) • Built-in high and low side diodes • Simultaneous on state prevention function (through-current prevention) • Built-in thermal shutdown circuit • Noise canceling function
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter Motor supply voltage Output peak current Output continuous current Logic system supply voltage Logic input voltage range Emitter output voltage range Allowable power dissipation Operating temperature Storage temperature Symbol VBB max IO peak IO max VCC max VIN VE Pd max Topr Tstg Independent IC tW ≤ 20μs Conditions Ratings 30 1.0 0.8 6.0 -0.3 to VCC 1.0 2.8 -20 to +90 -55 to +150 Unit V A A V 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.
41107 TI PC B8-6489, 6394 No.7633-1/9
LB1945D
Recommended Operating Range at Ta = 25°C
Parameter Motor supply voltage Logic system supply voltage Reference voltage Symbol VBB VCC VREF Conditions
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Ratings 10 to 28 4.75 to 5.25 1.5 to 5.0 Unit V V V
Electrical Characteristics at Ta = 25°C, VBB = 24V, VCC = 5V, VREF = 5V
Parameter Output block Output stage supply current Output saturation voltage 1 Output saturation voltage 2 Output saturation voltage 3 Output saturation voltage 4 Output leakage current IBB ON IBB OFF VO sat1 VO sat2 VO sat3 VO sat4 VO1(leak) VO2(leak) VSUS I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V ENABLE = 3.2V IO = +0.5A, sink side IO = +0.8A, sink side IO = -0.5A, source side IO = -0.8A, source side VO = VBB, sink side VO = 0V, source side L = 3.9mH, IO = 1.0A* -50 30 V 0.3 0.5 1.6 1.8 0.5 1.0 2.0 0.2 0.5 0.7 1.8 2.0 50 V V V V μA mA Symbol Conditions min Ratings typ max Unit
Output sustain voltage Logic block Logic supply current
ICC ON ICC OFF VIH VIL IIH IIL VREF/ VSEN IREF ICR TS TSHY
I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V ENABLE = 3.2V
50 7 3.2
70.0 10.0
92 13
mA
Input voltage
1.8 VIH = 3.2V VIL = 0.8V I1 = 0.8V, I2 = 0.8V I1 = 3.2V, I2 = 0.8V I1 = 0.8V, I2 = 3.2V VREF = 5.0V, I1 = 0.8V, I2 = 0.8V CR = 1.0V 35 7 9.5 13.5 25.5 17.5 -1.0 170 40 50 10 10 15 30 25 65 13 10.5 16.5 34.5 32.5
V μA
Input current Set current control threshold value Reference current CR pin current Thermal shutdown temperature Thermal shutdown hysteresis
μA μA °C °C
*: The design specification items are design guarantees and are not measured.
Package Dimensions
unit:mm (typ) 3147C
3.5
Pd max – Ta
Independent IC
28
15
Allowable power dissipation, Pd max – W
3.0 2.8 2.5
R1.7
12.7 11.2
8.4
1
20.0 26.75
14
0.4
2.0
1.5
1.34
1.0
4.0
0.5 0 -20
4.0
(1.81)
1.78
0.6
1.0
0
20
40
60
80
100
Ambient temperature, Ta – °C
SANYO : DIP28H(500mil)
No.7633-2/9
LB1945D
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Pin Assignment
ENABLE1
SUBGND
D-GND
PHASE1
VREF1 16 13 VREF2
OUTA
OUTA
VBB
28
27
26
25
24
E1
23
22
21
20
19
18
17
15
LB1945D
1 OUTB
2 OUTB
3 NC
4 SUBGND
5 VBB
6 E2
7 D-GND
8 CR
9 PHASE2
10 ENABLE2
11 IB2
.