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PDF LB8649W Data sheet ( Hoja de datos )
| Número de pieza | LB8649W | |
| Descripción | Digital Camera Motor Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LB8649W (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Ordering number : EN7894B
LB8649W
Monolithic Digital IC
Digital Camera Motor Driver
http://onsemi.com
Overview
The LB8649W integrates the actuator drivers required by digital cameras on a single chip.
Features
• Integrates the actuator drivers required by digital cameras on a single chip.
1. Shutter drive ("SH") /AE system constant current output stepping motor or two VCM drivers
2. Zoom system constant voltage output stepping motor or DC motor driver (forward/reverse/brake)
3. AF system constant voltage output stepping motor driver
• Zero standby mode current consumption (allows batteries to be connected directly)
• Four independent power supply systems (SH/AE, AF, zoom, and input logic systems)
• Low-voltage drive (allows operation from two NiMH batteries)
• Built-in thermal protection circuit
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Maximum supply voltage
VB max
VB power supply
Maximum input voltage
Maximum output voltage
Maximum output current
Allowable power dissipation
VCC max
VIN max
VOUT max
IO max
Pd max
VCC power supply
Per channel
When mounted on a circuit board *1
Operating temperature
Topr
Storage temperature
Tstg
*1 Specified circuit board : 76.1 × 114.3 × 1.6mm3, glass epoxy.
Ratings
10.5
10.5
10.5
10.5
600
1.0
-20 to +80
-55 to +150
Unit
V
V
V
V
mA
W
°C
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
Semiconductor Components Industries, LLC, 2013
June, 2013
31407 TI PC B8-6247, B8-6569 No.7894-1/9
1 page  
LB8649W
(3) SH/AE system VCM driver constant current control or stepping motor drive
Input
Output
IN9
IN10
IN11
IN12
INHD
OUT9 OUT10 OUT11 OUT12
Vref
ISH
Mode
Low Low Low Low
−−−−−
−
Standby
High
Low
*
*
High
Low
Low
*
*
High
Low
*
High
*
*
Low
High
*
*
High
Low
*
*
High
*
Low
High
*
*
Low
Low
High
Low
High
Low
High
Low
High
High
Low
High
Low
High
1.0V
Low 0.67V
Setting
voltage
state
SH & AE
Hold
* * Low High
Low High
Low Low Low Low
−−−−
Discharged
Standby
Notes
1. "−" indicates the output off state, "*" indicates "Don't care".
2. OUT9 and OUT10 are for SH, and provide stable startup characteristics with fast charge and fast discharge circuits.
3. OUT10 and OUT11 are for AE.
4. In standby mode, the ISH pin voltage is discharged by an internal transistor and thus is set to 0V.
5. Furthermore, the ISH pin is also set to the discharged state when inputs are provided to IN1 through IN8. This is for startup
correction.
6. When INHD is low, the Vref voltage will be 1.0V, and when high, the Vref voltage will be 0.67V.
Notes on Application Design
(1) Constant current level setting (ISH, IAE, RFG1/2, and OUT9 to OUT12)
The constant current level for the OUT9/10 pair is set by the ISH input voltage and the resistor connected to RFG1. As
shown in the block diagram, the current is controlled so that the voltage generated across the current detection resistor
connected between RFG1 and ground and the ISH input voltage become equal. The output current can be determined
from the following equation.
(Output current between OUT9 and OUT10) = (ISH input voltage) ÷ (RFG1 resistance + 0.05Ω)
The 0.05Ω here is the shared impedance of the emitter of the output transistor that drives the constant current and the
constant current control amplifier's sensing line.
Similarly, the constant current level for the OUT11/12 pair is set by the IAE input voltage and the resistor connected to
RFG2.
Note that since the constant current control block is connected to PGND internally to the IC, if voltage is provided to
ISH and IAE through a voltage divider, the voltage divider resistor ground must be connected to PGND.
(2) Rapid charge and discharge circuits (FC1, OUT9, and OUT10)
The SH control block (OUT9/10) includes rapid charge and rapid discharge circuits to support burst (rapid sequential)
imaging.
Since this type of circuit is not included in the AE control block (OUT11/12), the OUT9/10 block must be used for
shutter drive.
No.7894-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LB8649W.PDF ] | |
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