DC Fan Motor Drivers
Overview
The LB1662D, 1662M are 2-phase brushless motor drivers
operated from 5 V power supply. Motor Lock protection and
automatic return can be provided with a minimum number of
external parts.
Features and Functions
.
Designed to be operated from 5 V power supply, making
stable operation possible at a reduced voltage.
.
Direct connection to a Hall element possible.
.
Built-in output transistors with output current 1.5 A
.
Built-in rotation detect function (Drive mode: ``L'', Stop
mode: ``H'')
.
Built-in motor lock protector and automatic return function
.
With radio noise reduction pin
Package Dimensions
unit : mm
3098B-DIP10S
[LB1662D]
SANYO : DIP10S
unit : mm
3097-MFP16FS
[LB1662M]
SANYO : MFP16FS
Ordering number: EN3416A
Monolithic Digital IC
LB1662D, 1662M
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
O1596HA(II)/7190TA(GTPS) No.3416-1/6
Specifications
Absolute Maximum Ratings
at Ta = 25 C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
IN
max
7
V
Output voltage
V
OUT
0.3 to +85
V
Output current
I
OUT
1.5
A
RD flow-in current
I
RD
10
mA
RD voltage
V
RD
50
V
Allowable power dissipation
Pd max
LB1662D
1.2
W
LB1662M (Independent IC)
0.9
W
LB1662M with Specified board
*
1.2
W
Operating temperature
Topr
40 to +80
C
Storage temperature
Tstg
55 to +125
C
* Specified board (20
30
1.5 mm
3
glass epoxy resin)
Allowable Operating Ranges
at Ta = 25 C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage range
V
IN
3.8 to 6.0
V
Common-mode input voltage range
V
ICM
0 to V
IN
1.5
V
Electrical Characteristics
at Ta = 25 C, V
IN
= 4.3 V
Parameter
Symbol
Conditions
min
typ
max
Unit
Output withstand voltage 1
V
OR
80
V
Output withstand voltage 2
V
O(SUS)
I
O
= 0.1
65
V
Output saturation voltage
V
O
sat 1
I
O
= 0.5 A
0.95
1.2
V
V
O
sat 2
I
O
= 1.0 A
1.15
1.5
V
V
O
sat 3
I
O
= 1.5 A, V
IN
= 4.8 V
1.4
2.0
V
V
IN
flow-in range
I
IN
1.4
2.5
3.7
mA
Amp input offset voltage
V
OFF
7
0
7.0
mV
Amp input bias current
I
BA
250
nA
RD output saturation voltage
V
RD
(sat) I
RD
= 5 mA
0.1
0.2
V
C flow-out current
I
C
1
1.5
2.8
4.1
A
C discharge current
I
C
2
0.21
0.38
0.61
A
Comparator input threshold voltage
V
TH
1
0.67
0.7V
IN
0.73
V
V
TH
2
0.34
0.38V
IN
0.42
V
LB1662D, 1662M
No.3416-2/6
Pin Assignments
Pin Functions
Pin No.
Pin name
Function
1
2
IN-
IN+
Input pins for hall element outputs.
Common-mode input voltage range is 0 to V
IN
-1.5 V, offset voltage is 7 mV
3
C
Capacitor pin (1 to 10 F) that forms automatic return circuit.
When rotation is stopped due to overload, the pin voltage increases and output stops.
After proper load adjustment, the output returns from ``stop'' mode to ``drive'' mode automatically.
The lock detect time can be set by changing the capacitor constant.
4
6
OUT1
OUT2
Output pins. The output transistor is Darlington connected.
Connect either an external capacitor or an external Zener diode for output transistor protection.
5
GND
Ground pin.
8
7
B1
B2
Base pins for Darlington connected output transistors.
If radio noise is a problem, add a capacitor (0.01 to 0.1 F).
9
RD
Open collector output. Drive mode: ``L'', Stop mode: ``H''
10
V
IN
Insert a limiting resistor between V
CC
and V
IN
and use the voltage applied between V
IN
and ground in a
range from 3.8 to 6.0 V.
In this case, the current consumption I
CC
at the V
IN
pin is 1.4 to 3.7 mA (when V
IN
= 4.3 V).
Allowable
power
dissipation,
Pd
max
W
(Independent IC)
(Independent IC)
Ambient temperature, Ta C
Glass epoxy resin (LB1662M)
Top view
LB1662D, 1662M
No.3416-3/6
Truth Table
IN+
IN
C
OUT1
OUT2
H
L
L
H
L
L
H
L
L
H
H
L
H
H
H
L
H
H
H
H
Usage Notes
(See the Sample Application Circuits.)
(1) Supply voltage (V
IN
pin)
Use these ICs with the voltage applied between V
IN
and ground in the range from 3.8 to 6.0 V. The current consumption,
I
CC
, at the V
IN
pin is from 1.4 to 3.7 mA (when V
IN
= 4.3 V). Insert diode D1 to keep coil kickback out of the power line.
This diode also prevents breakdown due to reverse connections. Also, inserting R1 limits the reverse connection current
flowing into ground and V
IN
. These ICs have a reverse connection withstand current, I
CC
= 200 mA. Check R1 around the
range from 50 to 200
.
(2) Hall input pin voltage (IN and IN+ pins)
Set the voltage levels of the input pin for the Hall element output and the Hall element output voltage to within the range of
0 V to V
IN
-1.5 V.
The gain between the Hall input pin and the output pin is 100 dB or greater. The offset voltage of the Hall input amp is
7 mV. Therefore, the Hall element output must be set with the offset voltage (
7 mV) considered.
(3) Output transistors (OUT1 and OUT2 pins)
Output current I
O
= 1.5 A max.
Output saturation voltage V
O
sat = 1.15 V/1.0 A (typ.)
The LB1662D, 1662M requires one of the three types of output protection.
1 When external capacitors are connected between OUT and ground, the capacitance should not exceed 10 F. Use
capacitance that will hold kickback voltage and back voltage to 80 V or less.
2 When external Zener diodes are connected, use one that will have a cutoff voltage of 65 V or less. If radio noise is a
problem, insert a 0.01 F to 0.1 F capacitor between B1 and B2.
3 When external capacitors are connected between OUT and B, use one that will hold kickback voltage to 65 V or less. If
it oscillates, insert resistance in series with the capacitor.
(4) Output protection function (C pin)
Capacitor pin used in forming an automatic return circuit.
If rotation is stopped due to overload, the pin voltage increases and then forces the output to become inactive. In this case,
after proper load adjustment, the output returns to the `drive' mode from the `stop' mode automatically. By changing the
capacitor value, the lock detect time period can be set.
Automatic return circuit C pin voltage
For 1 F
lock detection time about 1 seconds
lock protection time (output ON) about 0.5 second
(output OFF) about 3.5 seconds
Rotation
Ouptut on
Output off
Output
on
Output off
Rotation
Lock
Lock released
LB1662D, 1662M
No.3416-4/6
1 When a fan is rotating, the capacitor is charge at 2.8 A (typ) and discharged through the C with pulses according to the
rotational speed.
2 When a fan is locked, no discharge occurs through the C and the C voltage rises, turning OFF the output at V
TH
1 (0.7
V
IN
).
3 When the output is turned OFF, discharge occurs through the C at 0.38 A (typ). If the lock is not released when the C
voltage drops to V
TH
2 (0.38
V
IN
), the capacitor is charged to V
TH
1 again. (At this moment, the output is turned ON.)
These operations 2 and 3 repeated at a cycle of approximately t
ON
: t
OFF
= 1 : 7 protect a motor.
4 If the lock is released when the C voltage drops to V
TH
2, the output is turned ON, starting rotation.
(5) Rotation detect signal (RD pin)
Open collector output (Drive mode: ``L'', Stop mode: ``H'')
(6) Radio noise reducing (B1 and B2 pins)
These are the base pins for Darlington connected output transistors. If radio noise is a problem, add a capacitor of
approximately 0.01 to 0.1 F between B1 and B2, or 0.001 F to 0.01 F between OUT and B.
Block Diagram and Sample Application Circuit -
1
Control block
Low
current
circuit
0.47 to 10F
*1 Use (10,000 to 100,000 pF) if radio noise is a problem.
*2 Use a Zener diode or capacitor for output stage protection.
LB1662D, 1662M
No.3416-5/6
Sample Application Circuit -
2
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of October, 1996. Specifications and information herein are subject to change without notice.
* When a ceramic capacitor
oscillates, insert
resistance in series with
the capacitor.
F
LB1662D, 1662M
No.3416-6/6
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