Sanyo LB1940T 2-ch h-bridge constant current driver Datasheet

Ordering number : EN7232A
LB1940T
LB1940U
Monolithic Digital IC
2-ch H-Bridge Constant Current Driver
Overview
The LB1940T and LB1940U are 2-phase exciter type bipolar stepping motor driver ICs that feature low-voltage,
(supporting 3V battery) and low current operation with low saturation voltage. These ICs enable constant-current control
of actuators, and are optimal for driving the actuators of PC peripherals such as USB compatible scanners, FDDs, and
printers, as well as for controlling the shutter, iris, and AF of a digital still camera.
Features
• Low-voltage driving
2-power source type:
VS = 1.6 to 7.5V, VDD = 1.9 to 6.5V
Single power source type: VS = VDD = 1.9 to 7.5V
• Low saturation output:
VO(sat) = 0.3V at IO of 200mA
• Constant-current control
• Built-in reference voltage (Vref = 0.9V)
• Small-sized, low-profile package (LB1940T: TSSOP20; 225mil; thickness (t) = 1.2mm max.)
(LB1940U: MSOP20; thickness (t) = 0.85mm max.)
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VB max
VS1, VS2, VDD
-0.3 to +10.5
V
Output applied voltage
VOUT max
OUT1, OUT2, OUT3, OUT4
-0.3 to +10.5
V
-0.3 to +10.5
Output Current
IO max
Input applied voltage
VIN max
ENA1, ENA2, IN1, IN2, VC
Allowable power dissipation
Pd max
Mounted on a specified board *
Operating temperature
Topr
-20 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
400
800
mA
V
mW
* Mounted on a Specified board: 114.3mm×76.1mm×1.6mm, glass epoxy
Any and all SANYO Semiconductor products described or contained herein do not have specifications
that can handle applications that require extremely high levels of reliability, such as life-support systems,
aircraft's control systems, or other applications whose failure can be reasonably expected to result in
serious physical and/or material damage. Consult with your SANYO Semiconductor representative
nearest you before using any SANYO Semiconductor products described or contained herein in such
applications.
SANYO Semiconductor assumes no responsibility for equipment failures that result from using products
at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition
ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor
products described or contained herein.
D2706 MS IM / 93004 JO IM No.7232-1/8
LB1940T/1940U
Allowable Operating Range at Ta = 25°C
Parameter
Function-guaranteed voltage range
Symbol
Conditions
Ratings
min
typ
unit
max
VOPR1
VDD system, VS = 2.0V
1.9
6.5
VOPR2
VS system, VDD = 5.0V
1.6
7.5
V
Low level input threshold voltage
VIL
ENA1, ENA2, IN1, IN2
-0.3
1.0
V
High level input threshold voltage
VIH
ENA1, ENA2, IN1, IN2
2.0
6.0
V
VC input voltage
VC
0.19
1.0
V
Electrical Characteristics at Ta = 25°C, VS = 3V, VDD = 5V
Parameter
Standby current dissipation
Symbol
ISTB
Conditions
Ratings
min
typ
VS = VDD = 6.5V
unit
max
0.1
1.0
0.95
µA
Regulator output circuit
VREF output voltage
VREF
IOL = 0 to 1mA
0.85
0.9
SVDD output voltage
VSVDD
IOL = 10mA
4.70
4.85
V
VO(sat)1
VDD = 5.0V, VS = 2.0V
IO = 200mA (PNP side)
0.20
0.30
V
VO(sat)2
VDD = 5.0V, VS = 2.0V
IO = 200mA (NPN side)
0.10
0.15
V
IOUT1
VDD = 6.0V, VC = 0.2V, VS = 3.5V
RL = 5Ω (between OUT-OUT), RFB = 2Ω
94
100
106
mA
180
200
220
mA
1.5
3
mA
4
7
mA
-1
µA
100
µA
V
H bridge output circuit
OUT output saturation voltage
(at saturation control)
OUT output current
(at constant current control)
IOUT2
VC =
Rb
Ra + Rb
VREF (Ra = 70kΩ, Rb = 20kΩ) *
VDD = 6.0V, VS = 2.0V
RL = 5Ω (between OUT-OUT), RFB = 1Ω
VS system operating current
IS1
VDD system operating current
Rb
VC =
consumption
IDD1
Rb
VC =
dissipation
Ra + Rb
Ra + Rb
VREF (Ra = 70kΩ, Rb = 20kΩ) *
VREF (Ra = 70kΩ, Rb = 20kΩ) *
ENA1 = 2V
VC input current
IVC
VDD = 6.0V, VS = 2.0V, VC = 1.9V
IIH
VIH = 5.5V
0
Control input circuit
Control pin maximum input current
IIL
VIL = GND
80
-1
0
* For Ra and Rb, refer to Application Circuit Diagram.
No.7232-2/8
LB1940T/1940U
Package Dimensions
Package Dimensions
unit : mm (typ)
3246
unit : mm (typ)
3262
[LB1940T]
5.2
0.5
6.5
20
11
[LB1940U]
11
0.5
6.3
4.4
4.4
6.4
20
1
0.22
10
0.15
(1.0)
1.2max
0.65
(0.3)
1
10
(0.35)
0.125
0.2
0.85max
(0.65)
0.08
0.5
0.08
SANYO : TSSOP20(225mil)
SANYO : MSOP20(225mil)
Pd max - Ta
Allowable Power Dissipation, Pd max - mW
1000
Mounted on a Specified board:
114.3mm×76.1mm×1.6mm glass epoxy
800
800mW
600
400
200
0 LB1940T/U
--20
0
20
40
60
Ambient Temperature, Ta- °C
80
100
ILB01486
True Table
Input
Output
ENA
IN
1
2
L
L
H
1
OUT
2
SVDD
3
Mode
1
2
4
H
L
H
on
L
H
L
on
Forward rotation
Standby (current dissipation zero)
H
H
L
A blank means “don’t care”.
Reverse rotation
L
H
on
Reverse rotation
H
L
on
Forward rotation
A blank means “off”.
No.7232-3/8
LB1940T/1940U
Pin Assignment
VC1
1
20 VS1
S-GND
2
19 SVDD
VS1 1
20 VC1
SVDD 2
VC2
3
18 V DD
Vref
4
17 OUT1
ENA1
5
ENA2
6
VDD 3
18 VC2
OUT1 4
17 Vref
RFG1 5
16 ENA1
LB1940U
OUT2 6
16 RFG1
LB1940T
19 S-GND
15 ENA2
OUT3 7
14 IN1
RFG2 8
13 IN2
15 OUT2
IN1
7
14 OUT3
OUT4 9
12 FC1
IN2
8
13 RFG2
VS2 10
11 FC2
FC1
9
12 OUT4
FC2 10
Top view
11 VS2
Top view
Pin Description
Pin No.
Pin
LB1940T
LB1940U
Name
1
20
VC1
Pin No.
Description
Reference voltage input for 1ch
Pin
LB1940T
LB1940U
Name
1
10
VS2
Description
Motor power supply (+)
control
2
19
S-GND
GND for control system
2
9
OUT4
Motor drive output 4
3
18
VC2
Reference voltage input for 2ch
3
8
RFG2
Constant-current detection pin
4
17
Vref
Reference voltage output
4
7
OUT3
Motor drive output 3
5
16
ENA1
Signal input for 1ch control
5
6
OUT2
Motor drive output 2
6
15
ENA2
Signal input for 2ch control
6
5
RFG1
Constant-current detection pin 1
7
14
IN1
Signal input for 1ch control
7
4
OUT1
Motor drive output 1
8
13
IN2
Signal input for 2ch control
8
3
VDD
Control system power supply (+)
9
12
FC1
C connection pin for 1ch phase
9
2
SVDD
10
1
VS1
control
Control system power output
compensation
10
11
FC2
C connection pin for 2ch phase
Motor power supply (+)
compensation
No.7232-4/8
+
--
FC1
VS1
RFG1
OUT1
300Ω
65kΩ
65kΩ
ENA2
VDD-SW
Reference voltage
logic circuit
VDD
IN1
65kΩ
ENA1
OUT2
IN2
65kΩ
S-GND
VC1
VREF
OUT3
SVDD
OUT4
RFG2
VS2
FC2
+
--
VC2
LB1940T/1940U
Block Diagram
300Ω
80kΩ
80kΩ
80kΩ
80kΩ
No.7232-5/8
LB1940T/1940U
Application Circuit Diagram
VDD
VS2
VS1
ENA1
OUT1
ENA2
CPU
IN1
IN2
OUT2
LB1940T
LB1940U
OUT3
OUT4
S-GND
FC1
SVDD
FC2
Vref
Ra
VC1
VC2
RFG1
RfB
RFG2
RfB
Rb
At constant-current control: The OUT current is controlled so that the RFG pin voltage is equal to the VC input pin
voltage.
For example, IOUT = 200mA (= 0.2V/1Ω) when VC = 0.2V and RFB = 1Ω.
*: There is no priority relationship between respective input voltages (ENA, IN) and respective supply voltages
(VDD, VS). For example, operation with VIN = 5V, VDD = 3V, VS = 2V is possible.
Note: The input voltage range to the reference voltage input pin VC for constant-current setting is from 0.19V to
1.0V.
Constant current setting
The composition of the constant-control circuit of this IC is as shown
in the figure below.
The voltage entered in the VC pin is entered as a reference to the “+”
side input of the constant-current control amplifier.
The “-” side of this constant-current control amplifier is connected to
the RFG pin via the wire bonded resistor Rb (= 0.1Ω).
The constant-current control circuit consists of comparison of the
voltage generated at the external current detection resistor with the
above reference voltage.
In addition, since the bias current Ib (= 1.5µA) flows out of the
positive (+) input of the constant current control amplifier during the
constant current control, if the voltage is input to the VC pin by
dividing the VREF voltage by 4.5 according to the dividing resistance
(70kΩ and 20kΩ) as shown in the figure, the formula for calculating
the VC voltage is as follows :
VC = VREF/4.5+Ib×20kΩ = VREF/4.5+0.03
Therefore, the theoretical equation to set the constant current IOUT is as follows:
IOUT = VC/(RFB+Rb) = (VREF/4.5+0.03)/(RFB+Rb)
No.7232-6/8
LB1940T/1940U
No.7232-7/8
LB1940T/1940U
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Information (including circuit diagrams and circuit parameters) herein is for example only; it is not
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This catalog provides information as of December, 2006. Specifications and information herein are subject
to change without notice.
PS No.7232-8/8
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