m66515fp Renesas Electronics Corporation., m66515fp Datasheet - Page 3

• Manufacturer Part Number: m66515fp
• Description: Laser Diode Driver/controller
• Manufacturer: Renesas Electronics Corporation.

M66515FP
Block Diagram
Explanation of operation
1. Laser driving current values
The values of the laser driving currents I
capacitor connected to the C
(1) I
Here 0 V
GND
(2) I
Here 0 V
2. Switching operation
When DATA="L", the LD driving current is I
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 C
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 V
Rev.1.00, Sep.22.2003, page 3 of 11
SW
B
(bias current)
(switched current)
CC
C
B
<3.5 V (typ), the internal current source is turned off and the C
V
V
CC
CC
-1.8 V, I
-2.7 V, I
H
SW
B
pin is forced to "L" level, and the charge on the capacitor connected to the C
(max) =30 mA, and R
(max) =120 mA, and R
H
pin.
SW
and I
SW
B
+I
B
is the value of the resistance connected between the R
can be approximated as follows, if V
B
S
; when DATA="H", the LD driving current is I
is the value of the resistance connected between the R
H
pin is forced to "L" level.
C
is the voltage of the hold
B
.
H
pin is forcibly
B
pin and GND
S
pin and