Page 1
Monolithic Digital IC
Ordering number : EN3976A
33098HA (OT)/D111TS No. 3976-1/6
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Three-Phase Brushless Motor Driver IC
LB1857M
Overview
The LB1857M is a three-phase brushless motor driver IC
designed for use as a camcorder capstan or drum motor
driver, or as a digital audio tape player/recorder motor
driver.
Features
• 120° voltage linear system
• Appropriate for portable applications, since the
LB1857M reduces system power requirements by using
motor voltage control for speed control.
• Built-in torque ripple compensation circuit
• Small external capacitances due to the adoption of a soft
switching technique (chip capacitor).
• Built-in thermal shutdown circuit
• Built-in FG amplifier
Package Dimensions
unit: mm
3073A-MFP30S
SANYO: MFP30S
[LB1857M]
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
V
CC
1 max 7 V
Supply voltage V
CC
2 max 16 V
V
S
max VCC2V
Output applied voltage V
O
max VS+ 2 V
Output current I
O
max 1.5 A
Allowable power dissipation Pd max 1.0 W
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –55 to +125 °C
Allowable Operating Ranges at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
V
CC
1VCC1 ≤ VCC2 4.0 to 6.0 V
Supply voltage V
CC
2 4 to 14 V
V
S
Up to VCC2V
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No. 3976-2/6
LB1857M
Electrical Characteristics at Ta = 25°C, VCC1 = 5 V, VCC2 = 7 V, VS= 3 V
Ratings
Parameter Symbol Conditions
min typ max
Unit
I
CC
1 VBR= 5 V 4.5 6.5 mA
Supply current I
CC
2 VBR= 5 V 13 20 mA
I
S
VBR= 5 V, RL= ∞ 6.5 9.0 mA
Output quiescent current
I
CCOQ
V
STBY
= 0 V 180 µA
I
SOQ
V
STBY
= 0 V, RL= ∞ 150 µA
Output saturation voltage V
O(sat)
I
OUT
= 0.6 A, sink + source 2.3 V
Output TRS withstand voltage V
O(sus)
I
OUT
= 20 mA*1 16 V
Output quiescent voltage V
OQ
VBR= 5 V 1.4 1.5 1.6 V
Hall amplifier input offset voltage V
HOFFSET
*1 –5 +5 mV
Hall amplifier common mode input
V
HCOM
1.4 2.8 V
voltage range
Hall I/O voltage gain GV
HO
Rangle = 8.2 kΩ 32.0 35.0 38.0 dB
Brake pin high level voltage V
BRH
2.0 V
Brake pin low level voltage V
BRL
0.8 V
Brake pin input current I
BRIN
100 µA
Brake pin leakage current I
BRLEAK
–30 µA
FRC pin high level voltage V
FRCH
2.8 V
FRC pin low level voltage V
FRCL
1.2 V
FRC pin input current I
FRCIN
100 µA
FRC pin leakage current I
FRCLEAK
–30 µA
Upper side residual voltage V
XH
I
OUT
= 100 mA, VCC2 = 6 V, VS= 2 V 0.32 0.49 V
Lower side residual voltage V
XL
I
OUT
= 100 mA, VCC2 = 6 V, VS= 2 V 0.39 0.48 V
Overlap level OL V
CC
2 = 6 V, VS= 3 V 60 70 80 %
Standby on voltage V
STBYL
*2 –0.2 +0.1 V
Standby off voltage V
STBYH
2 5 V
Standby pin bias current I
STBYIN
10 µA
Thermal protection circuit operating
T
TSD
*1 150 180 210 °C
temperature
Thermal protection circuit hysteresis
∆T
TSD
*1 15 °C
[FG amplifier]
Input offset voltage V
FG OFFSET
–8 +8 mV
Open loop voltage gain GV
FG
f = 1 kHz 60 dB
Source output saturation voltage V
FG OU
IO= –2 mA 3.7 V
Sink output saturation voltage V
FG OD
IO= 2 mA 1.3 V
Common mode signal exclusion ratio CHR *1 80 dB
FG amplifier common mode input
V
FG CH
0 3.5 V
voltage range
Phase margin φM *1 20 deg
Schmitt amplifier threshold voltage V
FGS SH
V
FGIN
+
= 2.5 V,
2.45 2.50 2.55 V
when V
FGOUT
2 goes from high to low
Schmitt amplifier hysteresis width V
FGS HIS
V
FGIN
+
= 2.5 V 20 40 60 mV
Note: 1. These are target settings, and are not measured. The overlap ratings are taken as test ratings without change.
2. When the standby pin is open the IC will be in the standby state.
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No. 3976-3/6
LB1857M
Pin Assignment
Block Diagram
Top view
Allowable power dissipation, Pd max – W
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No. 3976-4/6
LB1857M
Pin Functions
Pin No. Symbol Pin voltage Equivalent circuit Pin function
4 V
S
≤ VCC2 Power supply input that determines the output
amplitude. It must be set to a voltage equal or
lower than V
CC
2.
5 V
CC
2 4 to 14 V Power supply for power amplifier systems other
than motor drive transistors. Power supply pin
that provides voltage for blocks other than control
blocks supplied by V
CC
1.
6 V
CC
1 4 to 6 V Power supply that provides voltage for the Hall
amplifier, the forward/reverse circuit, the FG
amplifier, and the thermal shutdown circuit.
8 ANGLE Connect a resistor between this pin and GND.
Changing the value of this resistor will change the
Hall input-output gain (motor waveform slope).
10 FG
IN
–
0 V min FG signal input pin
11 FG
IN
+
3.5 V max
(When V
CC
1 is 5 V)
12 FG
OUT
1 FG amplifier output pin
7 ST. BY (H): 0.1 V max All circuits can be made inoperative either by
(L): 2.0 V min connecting this pin to GND, or by leaving it open.
(When V
CC
1 is 5 V)
In that state the supply current will be
approximately 100 µA. Hold at 2 V or higher
during normal operation.
Continued on next page
Unit (resistance: Ω)
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Continued from preceding page.
Pin No. Symbol Pin voltage Equivalent circuit Pin function
No. 3976-5/6
LB1857M
19 BR (H): 2.0 V min Motor brake pin
(L): 0.8 V max
Low level: Motor drive
(under 0.8 V)
High level: Motor brake
(over 2.0 V)
20 W
IN
2 1.4 V min W phase Hall element input pins.
21 W
IN
1 2.8 V max Logic high is defined to be states where
22 V
IN
2
(When V
CC
1 is 5 V)
W
IN
1 > WIN2.
23 V
IN
1
V phase Hall element input pins.
24 U
IN
2
Logic high is defined to be states where
25 U
IN
1
V
IN
1 > VIN2.
U phase Hall element input pins.
Logic high is defined to be states where
U
IN
1 > UIN2.
13 FG
OUT
2 FG Schmitt amplifier output pin
27 U
OUT
Output pin
28 V
OUT
3 W
OUT
26 R
f
Output transistor GND
1, 2, FRAME GND for all circuits other than output transistors.
14, 15, (GND)
16, 17,
29, 30
18 FRC (H): 2.8 V min Pin for setting the motor to forward or reverse
(L): 1.2 V max rotation
(When V
CC
1 is 5 V) Low level: Forward rotation
(under 1.2 V: when V
CC
1 is 5 V)
High level: Reverse rotation
(over 2.8 V: when VCC1 is 5 V)
Unit (resistance: Ω)
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Sample Application Circuit
Logic Value Table
Inputs:
High: For each phase, the input 1 potential is at least 0.2 V higher than the input 2 potential.
Low: For each phase, the input 1 potential is at least 0.2 V lower than the input 2 potential.
Forward/reverse control:
High: 2.8 V to V
CC
1
Low: 0 to 1.2 V
PS No. 3976-6/6
LB1857M
This catalog provides information as of March, 1998. Specifications and information herein are subject to
change without notice.
■ 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:
➀ 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:
➁ 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.
Source
Input
Forward and reverse control
Sink
U V W
F/RC
1
W phase → V phase
H H L
L
V phase → W phase H
2
W phase → U phase
H L L
L
U phase → W phase H
3
V phase → W phase
L L H
L
W phase → V phase H
4
U phase → V phase
L H L
L
V phase → U phase H
5
V phase → U phase
H L H
L
U phase → V phase H
6
U phase → W phase
L H H
L
W phase → U phase H
Units (resistance: Ω, capacitance: F)
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