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PDF LB11975 Data sheet ( Hoja de datos )
| Número de pieza | LB11975 | |
| Descripción | High-Speed CD-ROM Spindle Motor Driver IC | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number : ENN6497A
Monolithic Digital IC
LB11975
High-Speed CD-ROM Spindle Motor Driver IC
Overview
The LB11975 is a monolithic bipolar IC developed for
uses as a spindle motor driver for high-speed CD-ROM
and DVD-ROM drives. To minimize heat generation
during high-speed rotation and braking, the LB11975
adopts direct PWM drive in the output stage. During
reverse braking the upper and lower side output transistors
are both driven in PWM mode to implement dual PWM
controlled braking. The device thus controls the current to
remain under a limit value and prevent rapid heat
generation. This prevents device destruction due to rapid
heating. The absolute maximum voltage rating is 27 V,
and the maximum current is 2.5 A.
Functions and Features
• Direct PWM drive (lower side control)
• Built-in upper and lower side output diodes
• Supports the use 3.3 V DSP devices.
• Power saving function for standby mode
• Hall FG output (1 or 3 Hall device operation)
• Built-in Hall device power supply
• Reverse rotation detection output and drive cutoff circuit
• Voltage control amplifier
• Current limiter circuit
• Thermal protection circuit
Package Dimensions
unit: mm
3251-HSOP36R
[LB11975]
17.8
(6.2)
36 19
1
(0.5)
0.8 2.0
18
0.3
0.25
2.7
SANYO: HSOP36R
Pd max — Ta
2.4
Mounted on the specified printed circuit
(114.3 × 76.1 × 1.6 mm3 glass epoxy board)
2.1
2.0
1.6
1.2
Independent IC
0.9
0.8
0.4
1.26
0.54
0
–20 0
20 40 60 80 100
Ambient temperature, Ta — °C
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
11201RM (OT) No. 6497-1/12
1 page  
Pin Assignment
LB11975
1 OUT2
2 OUT2
3 OUT3
4 OUT3
5 NC
6 GND2
7 GND2
8 VCC3
9 VCC2
OUT1 36
OUT1 35
NC 34
NC 33
NC 32
GND2 31
GND2 30
VCC3 29
LB11975
RF 28
FR FRAME
GND
10 PWM
11 FC
12 PH
13 VCREF
14 VCTL
15 S/S
16 VH
17 GND1
18 IN3-
FRAME FR
GND
VCC1 27
FG1 26
FG2 25
RS 24
IN1+ 23
IN1- 22
IN2+ 21
IN2- 20
IN3+ 19
Top view
No. 6497-5/12
5 Page 
LB11975
(3) When both the upper and lower side transistors are switched and current detection (RF) is performed in the upper side
transistor
During reverse torque braking, when the coil current increases and the limit is reached, both the upper and lower side
transistors are turned off. The motor current circuit path at this point is as follows:
Coil → upper side diode → VCC → power supply line capacitor → ground → lower side diode → coil
When the limiter circuit operates, both the upper and lower side transistors are turned off, so short-circuit breaking
does not occur, and coil current attenuation is all that occurs. Thus this technique allows current control at the set
(limiter) current to be performed even during reverse torque braking.
Regenerative Current Path
+
–
RF
Drive Mode
A13187
No. 6497-11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LB11975.PDF ] | |
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