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BD1206GUL Fiches technique(PDF) 8 Page - Rohm

No de pièce BD1206GUL
Description  Backlight LED Driver for Small LCD Panels (Charge Pump Type)
Download  13 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BD1206GUL Fiches technique(HTML) 8 Page - Rohm

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Technical Note
8/12
BD1206GUL
www.rohm.com
2010.02 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
(6) Power sequence
EN signal must be released after VBAT voltage enough rise up.
Prohibit the VBAT rise up during EN=”H”.
VBAT
EN
Fig.8
Power sequence
(7) PWM control
PWM control by the external terminal (PWMIN) is possible.
It becomes PWM operation, which used LED current by a register setup as the base and is the best for the brightness
compensation by external control.If the application with is not use PWM, PWMIN pin must be short to VBAT.
Fig.9 External PWM input solution
It is possible to make it a PWMIN input before EN/LED* is “H”.
A PWM drive becomes effective after the time of LED current standup.
When rising during PWM operation, as for the standup time of VOUT, only the rate of PWM Duty becomes late.
Appearance may be influenced when extremely late frequency and extremely low Duty are inputted.
Please secure over 120 μs “H” sections at the time of PWM pulse Force.
EN/LED* is an internal enable signal
PWMIN
LED Current
L
Compulsion OFF
H
Normal operation
EN /L ED *
VO U T
PW M IN in p u t
LE D C u rrent
In te rn a l S o ft-S ta rt T im e
N on-P W M
PW M IN in p u t
L E D Cu rre n t


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