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PDF LB1976 Data sheet ( Hoja de datos )
| Número de pieza | LB1976 | |
| Descripción | DC Fan Motor Driver | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number : ENN6088A
Monolithic Digital IC
LB1976
DC Fan Motor Driver
Overview
The LB1976 is a three-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.
Features
• Withstand voltage 60 V, output current 2.5 A
• Direct PWM drive output
• 3 built-in output top-side diodes
• Built-in current limiter
• Built-in FG output circuit
Package Dimensions
unit: mm
3147C-DIP28H
[LB1976]
28 15
R1.7
1 14
20.0
26.75
(1.81)
1.78
0.6 1.0
SANYO: DIP28H
Any and all SANYO 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 representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO 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 products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
21003AS (OT) / 52199RM (KI) No. 6088-1/12
1 page  
LB1976
Duty – VCTL characteristics
100
80
60
40
20
0
VCTL1
VCTL2
Control voltage, VCTL — V
Block Diagram and Peripheral Circuit
VREG
S/S F/R
FG1 FG2
VCC
VCC
Reg
+
LVSD
TSD
Hys.Amp
+
IN1 –
+
IN2 –
Logic
+
VM
OUT1
OUT2
OUT3
VCTL
+
+
IN3 –
31 kΩ
VCTL 40 kΩ VCTL Amp
–
+
2.35 V
PWM
OSC
VCREF VCOUT
OSC
Current
limiter
RF
0.5 V
Rf
GND1 GND2 GND3
VM
A11965
No. 6088-5/12
5 Page 
LB1976
Power Supply Stabilizing Capacitors
If the VCC line fluctuates drastically, the low-voltage protection circuit may be activated by mistake, or other
malfunctions may occur. The VCC line must therefore be stabilized by connecting a capacitor of at least several µF
between VCC and GND. Because a large switching current flows in the VM line, wiring inductance and other factors can
lead to VM voltage fluctuations. As the GND line also fluctuates, the VM line must be stabilized by connecting a
capacitor of at least several µF between VM and GND, to prevent exceeding VMmax or other problems. Especially when
long wiring runs (VM, VCC, GND) are used, sufficient capacitance should be provided to ensure power supply stability.
VCREF Pin, VCOUT Pin
These pins are always used in the Open condition. If chattering occurs in the PWM switching output, connect a capacitor
(about 0.1 µF) between VCREF and ground or between VCOUT and GND.
IC Heat Dissipation Fins
A heat sink may be mounted to the heat dissipation fins of this IC, but it may not be connected to GND. The sink should
be electrically open.
Sample calculation for internal power dissipation (approximate)
The calculation assumes the following parameters:
VCC = 5 V
VM = 30 V
Source-side output transistor ON duty cycle 80% (PWM control)
Output current IO = 1 A (RF pin average current)
• ICC power dissipation P1
P1 = VCC ×ICC = 5 V ×14 mA = 0.07 W
• Output drive current power dissipation P2
P2 = VM ×11 mA = 30 V ×11 mA = 0.33 W
• Source-side output transistor power dissipation P3
P3 = VO (source) ×IO ×Duty (on) = 0.9 V ×1 A ×0.8 = 0.72 W
• Sink-side output transistor power dissipation P4
P4 = VO (sink) ×IO = 1.1 V ×1 A = 1.10 W
• Total internal power dissipation P
P = P1 + P2 + P3 + P4 = 2.22 W
IC Temperature Rise Measurement
Because the chip temperature of the IC cannot be measured directly, measurement according to one of the following
procedures should always be carried out.
• Thermocouple measurement
A thermocouple element is mounted to the IC heat dissipation fin. This measurement method is easy to implement, but
it will be subject to measurement errors if the temperature is not stable.
• Measurement using internal diode characteristics of IC
This is the recommended measurement method. It makes use of the parasitic diode incorporated in the IC between FG1
and GND. Set FG1 to High and measure the voltage VF of the parasitic diode to calculate the temperature.
(Sanyo data: for IF = –1 mA, VF temperature characteristics are about –2 mV/°C)
NC Pins
Because NC pins are electrically open, they may be used for wiring purpose etc.
No. 6088-11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LB1976.PDF ] | |
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