LB8632V データシートの表示（PDF） - SANYO -> Panasonic

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LB8632V

Low-Voltage/Low-Saturation Camera Motor Driver

SANYO -> Panasonic 

LB8632V

Sample IB and VCC Pin Applications

1. Stabilized Power Supply

A low-saturation type stabilized power supply can be formed using an external pnp transistor (2SB815). This circuit

has a wide operating voltage range of 1.5 to 7.5 V, and can supply stable power to other pins and loads. This circuit

outputs a constant voltage 1.37 times the Vcont input voltage. A 1.86 V constant voltage output can be acquired by

directly connecting the VREF reference voltage (1.36 V) to the Vcont pin.

• This circuit sets up a constant voltage output of 1.86 V or lower.

When R1 is 20 kΩ, the output voltage can be set to any voltage

between 0.8 and 1.86 V (typical) by adjusting R2.

• This circuit sets up a constant voltage output of 1.86 V or higher.

Taking the manufacturing variation in the IC internal sensing resistor

(3.6 to 10 kΩ) into account, the total resistance of the external

sensing resistors (R1 and R2) should be about 1 kΩ.

Example: A constant voltage output VREG of 3.05 V is acquired

when R1 is 360 Ω and R2 is 680 Ω.

• Making the OUT pin output voltage a constant voltage.

Connect the OUT pin, which is to be made a constant voltage output,

to the VCC pin. When one side of the bridge output is connected,

when the connected side is a high-level output the circuit will be a

constant voltage drive circuit, and when the other side is a high-level

output the circuit will be a saturated drive circuit.

• Generating a hold voltage.

This circuit uses a resistance maintaining transistor to lower the

VCONT input and generate a hold voltage.

A 0.8 V (typical) hold voltage is acquired when R2 is 0 Ω.

• Generating a set constant voltage for different modes.

The VCONT input has a high impedance of 1 µA maximum, and thus

the set constant voltage can be changed as required for each mode by

inputting the CPU D/A converter output.

No. 5161-7/18

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