LB1409 Datasheet, PDF (4/4 Pages) Sanyo Semicon Device – Level Meter Driver for 9 LEDs

Sample Application Circuits
(All with offset adjustment)
. _{Circuit not using Vref 2}
LB1409
Adjusting procedures
1. Turn the center of 10 kΩ VR largely to 4.7 µF
capacitor side.
2. Input AC signal of 50/u2 mV from AC IN.
3. Adjust 1 kΩ VR so that the output at OUT becomes
500 mV DC.
Equation used in the calculation of R to be inserted
in series with LED.
Gain : 20 dB
R (red) = (V_CC – 2.5) / 6 kΩ
R (green) = (V_CC – 2.8) / 18 kΩ
. _{Circuit using Vref 2}
Unit (resistance: Ω, capacitance: F)
Adjusting procedures
. _{R to be inserted in series with LED is as follows}
irrespective of V_CC.
R (red) = 360 Ω (Approx. 6 mA)
R (green) = 100 Ω (Approx. 18 mA)
. _{TR1 should be chosen with PC considered; and the}
following transistors are recommended.
Red LED drive 2SD400
Green LED drive 2SD325
Unit (resistance: Ω, capacitance: F)
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,
nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or
indirectly cause injury, death or property loss.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors
and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and
expenses associated with such use:
2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO
ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.
Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume
production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use
or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of May, 1996. Specifications and information herein are subject to change without notice.
No.683-4/4