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PDF LB8648T Data sheet ( Hoja de datos )
| Número de pieza | LB8648T | |
| Descripción | DSC Driver | |
| Fabricantes | Sanyo Electric | |
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Ordering number : ENN*7892
LB8648T
Monolithic Digital IC
DSC Driver
Feature and functions
• Actuator driver for digital cameras embedded in one chip
1. Constant current control for AF (auto focus) Stepping motor × 1
→ 1-2 phase, 2 phase excitation possible.
2. Constant current control for SH (shutter)/AE (aperture) VCM (Voice Coil Motor) × 2
→ SH implements start-up/falling correction circuit.
3. Constant voltage control for ZOOM DC motor × 1
→ Operation by direct battery connection.
• Stand-by current consumed is 0 (zero).
• 2 power source systems (direct source connection, DC/DC systems)
• Large working voltage range (2.2 to 9V).
• Low saturation output
• Built-in overheat protection circuitry
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Max. Power Source Voltage
VB max
VB
Max. Input Applied Voltage
Max. Output Applied Voltage
Max. Output Current
Allowable Power Consumption
VCC max
VIN max
VOUT max
IO max
Pd max1
VCC
MD1, MD2, MD3, IN1, IN2, INA, INB
OUT1, OUT2, OUT3, OUT4, OUT5, OUT6
per CH
Circuit board mounting (*1)
Operating Temperature
Topr1
Storage Temperature
Tstg
(*1) Standard mounting circuit board : 76.1mm × 114.3mm × 1.6mm glass epoxy resin
Ratings
10.5
10.5
10.5
10.5
600
1000
-20 to +80
-55 to +150
Unit
V
V
V
mA
mW
°C
°C
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82504 JO IM No.7892-1/8
1 page  
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LB8648T
Application Design Notes
1. Constant current setting (ISH, IAE, IAF, RFG1/2, OUT1 to 6)
The constant current setting between pins OUT2 and OUT3 in SH mode (MD1/2/3 = L/H/L) is determined from the
ISH input voltage and the connecting resistor of RFG1. It is controlled in such a way so that the voltage generated at
the resistor used for current detection connected between RFG1 and GND would be equal to the ISH input voltage, as
for the circuit. The formula for calculating the output current is as given below.
(OUT2 to OUT3 Output Current) = (ISH Input Voltage) ÷ (RFG1 Resistor)
In the same way, the constant current setting between pins OUT5 and OUT6 in AE mode (MD1/2/3 = L/H/H) is
determined from the IAE input voltage and the connecting resistor of RFG2.
Also, the constant current setting between pins OUT1 and OUT2 and between pins OUT4 and OUT5 in AF mode
(MD1/2/3 = H/L/H or H/H/H) is determined from the IAF input voltage and the connecting resistor of RFG1 or
RFG2, respectively.
Furthermore, as the constant current control block within the IC is connected to SGND, when supplying voltage to
the ISH pin or IAE pin which has been divided by resistors be sure to connect the ground side of these resistors to
SGND.
2. Quick charge/discharge circuitry (FC1, OUT2 to 3)
Quick recharge and quick discharge circuitry has been built in to the shutter control block (OUT2 to OUT3) to
support high-speed shutter control (consecutive shots).
Quick recharge and quick discharge circuitry has not been built in to the AF control block (OUT5 to OUT6) and the
AF control block (OUT1 to OUT2, OUT4 to OUT5). Therefore, be sure to use the block (OUT2 to OUT3) for the
shutter drive.
3. Start-up correction function (ISH, OUT2 to 3)
The ISH pin input voltage is set with the decay time constant by using the external CR. By setting the voltage to be
lower than the coil decay time constant, the start-up wave of coil current is determined from the decay time constant
of the external CR. By doing this, stable shutter operation can be carried out with respect to the power supply
variations.
mNote) For the ISH pin start-up correction, check the coil current start-up wave for the VCC reduced voltage when
othere is no ISH pin capacitor and choose a capacitance so that the decay time constant is lower than this wave.
U.cHowever, when the power supply voltage is stable or the start-up correction function is not required, the start-up
t4correction capacitor is not necessary.
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LB8648T.PDF ] | |
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