M66515FP データシートの表示（PDF） - Renesas Electronics

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M66515FP

Laser Diode Driver/Controller

Renesas Electronics 

M66515FP

Block Diagram

Explanation of operation

1. Laser driving current values

The values of the laser driving currents ISW and IB can be approximated as follows, if VC is the voltage of the hold

capacitor connected to the CH pin.

(1) ISW (switched current)

Here 0≤VC≤VCC-1.8 V, ISW (max) =120 mA, and RS is the value of the resistance connected between the RS pin and

GND

(2) IB (bias current)

Here 0≤VB≤VCC-2.7 V, IB (max) =30 mA, and RB is the value of the resistance connected between the RB pin and GND

2. Switching operation

When DATA="L", the LD driving current is ISW+IB; when DATA="H", the LD driving current is IB.

3. ENB input

Whereas the laser driving current is controlled by DATA input by controlling the driving current applied to the laser

with the current source in the M66515 turned on, control by ENB turns the current source operation on and off.

When ENB="L" the current source is turned on, and when ENB="H" the current source is turned off.

When ENB="H", the CH pin is forced to "L" level, and the charge on the capacitor connected to the CH pin is forcibly

discharged.

4. Internal reset operation

The M66515 incorporates a reset circuit to prevent the flow of excessive current to the laser when power is turned on;

when VCC<3.5 V (typ), the internal current source is turned off and the CH pin is forced to "L" level.

Rev.1.00, Sep.22.2003, page 3 of 11

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