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ADP1110AR-12 View Datasheet(PDF) - Analog Devices

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ADP1110AR-12 Datasheet PDF : 16 Pages
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ADP1110
1.5 V to +5 V, +10 V Dual Output Step-Up Converter
The circuit of Figure 35 illustrates a way to get outputs of
+10 V and +5 V from the same converter. The main 5 V output
is derived from the feedback provided by the 487 kand 11 k
resistors. Capacitor C1 should be a multilayer ceramic variety
for best performance, but a good quality tantalum capacitor will
also give good performance at lower cost.
ONE
ALKALINE
CELL
1.5V
L1
50µH
220
CTX50-4
1
2
ILIM
VIN SW1 3
ADP1110
FB 8
AO SET GND SW2
6754
NC NC
D1
+10V
3mA
D2 487k
D3
+5V
3mA
4.7µF
11k4.7µF
NOTE: ALL DIODES 1N5818
Figure 35. 1.5 V to +5 V, +10 V Dual Output Step-Up
Converter
1.5 V-Powered Laser Diode Driver
Figure 36 shows a circuit suitable for driving many laser diodes
that incorporate a photodiode to monitor the laser diode
current, this circuit makes use of the gain block and current-
limit functions to provide a feedback system based on the
average laser diode current. This current must be controlled
very closely or permanent damage to the laser diode is likely to
be the result.
To ensure that the laser is operating at the proper power level,
the actual optical power from the laser should be monitored
with a calibrated photodiode or optical power meter. In
addition, the actual diode current should also be monitored, and
R1 can be adjusted to give the correct output power.
NOTES
1. All inductors referenced are Coiltronics CTX-series except
where noted.
2. If the source of power is more than an inch or so from the
converter, the input to the converter should be bypassed with
approximately 10 µF of capacitance. This capacitor should be
a good quality tantalum or aluminum electrolytic.
TOSHIBA
TOLD-9321
0.022µF 5.1k
2N3906
220
1µF
100µF
OS-Con
1k
1
1N4148
ILIM
2
VIN SW1 3 10
MJE210
1N5818
2
ADP1110
1.5V
SET 7
AO FB GND SW2
6
8
5
4 1k
2.2µH
Figure 36. 1.5 V-Powered Laser Diode Driver
–14–
REV. 0
 

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