LB1975_08 SANYO [Sanyo Semicon Device], LB1975_08 Datasheet

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LB1975_08

Manufacturer Part Number
LB1975_08
Description
For Fan Motor 3-phase Brushless Motor Driver
Manufacturer
SANYO [Sanyo Semicon Device]
Datasheet
1.LB1975_08.pdf (10 pages)
Ordering number : EN6087B
LB1975
Overview
Features
Specifications
Absolute Maximum Ratings at Ta = 25°C
Supply voltage
Output current
Maximum input current
Allowable power dissipation
Operating temperature
Storage temperature
The LB1975 is a 3-phase brushless motor driver IC suited for use in direct PWM driving of DC fan motors for air
conditioners, water heaters, and other similar equipment. Since a shunt regulator circuit is built in, single power supply
operation sharing the same power supply for the motor is supported.
• Withstand voltage 46V, output current 2.5A
• Direct PWM drive output
• 3 built-in output top-side diodes
• Built-in current limiter
• Built-in FG output circuit
Parameter
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
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
device, the customer should always evaluate and test devices mounted in the customer
equipment.
'
s products or equipment. To verify symptoms and states that cannot be evaluated in an independent
V CC max
V M max
I O max
I REG max
Pd max1
Pd max2
Topr
Tstg
Symbol
Monolithic Digital IC
For Fan Motor
3-phase Brushless Motor Driver
V REG pin
Independent IC
With infinite hear sink
Conditions
D1708 MS / 21003AS (OT) / 52199RM (KI) No.6087-1/10
Ratings
'
s products or
-20 to +100
-55 to +150
2.5
46
10
20
7
3
Unit
mA
°C
°C
W
W
V
V
A

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LB1975_08 Summary of contents

Page 1

Ordering number : EN6087B LB1975 Overview The LB1975 is a 3-phase brushless motor driver IC suited for use in direct PWM driving of DC fan motors for air conditioners, water heaters, and other similar equipment. Since a shunt regulator circuit ...

Page 2

Allowable Operating Ranges 25°C Parameter Symbol Supply voltage range Input current range I REG FG pin applied voltage pin output current I FG Electrical Characteristics 25°C, V ...

Page 3

Continued from preceding page. Parameter Symbol V CTL Pin Input voltage V CTL 1 V CTL 2 Input bias current I B 1(CTL 2(CTL) V CTL Amplifier Reference voltage V CREF Output voltage V COUT 1 V COUT ...

Page 4

Pin Assignment V CTL OSC (NC) V CREF IN1 − V COUT REG S/S F/R Truth Table Input IN1 IN2 IN3 ...

Page 5

Block Diagram and Peripheral Circuit V REG Reg Hys.Amp H IN1 H IN2 H IN3 V CTL Amp V CTL 40kΩ V CTL V CREF Pin Functions Pin No. Pin name Pin voltage ...

Page 6

Continued from preceding page. Pin No. Pin name Pin voltage 4 F/R 0. OUT1 7 OUT2 8 OUT3 GND3 15 GND1 12 GND2 17 FG1 0.0V ...

Page 7

Continued from preceding page. Pin No. Pin name Pin voltage 27 V CTL 0. CREF 0. − 2. COUT 0. − 0.7V LB1975 Function Output duty cycle control ...

Page 8

IC Description 1. Direct PWM Drive The LB1975 employs the direct PWM drive principle. Motor rotation speed is controlled by varying the output duty cycle according to an analog voltage input (V CTL ). This eliminates the need to alter ...

Page 9

Start/Stop Control Circuit The start/stop control circuit turns the source-side output transistors OFF (motor stop) when a High signal is input at the S/S pin or when the pin is Open. When a Low signal is input at the ...

Page 10

Sample calculation for internal power dissipation (approximate) The calculation assumes the following parameters 30V Source-side output transistor ON duty cycle 80% (PWM control) Output current (RF pin average ...

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