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BD1603NUV Datasheet(PDF) 6 Page - Rohm

No. de pieza BD1603NUV
Descripción Electrónicos  Backlight LED Driver for Small LCD Panels (Charge Pump Type)
Download  9 Pages
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Fabricante Electrónico  ROHM [Rohm]
Página de inicio  http://www.rohm.com
Logo ROHM - Rohm

BD1603NUV Datasheet(HTML) 6 Page - Rohm

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Technical Note
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www.rohm.com
2011.02 - Rev.B
© 2011 ROHM Co., Ltd. All rights reserved.
BD1603NUV
BD1603NUV
VIN
GND
VOUT
COUT
9.
Brightness control
Brightness control takes place in this LSI as follows.
a) PWM
The EN pin is turned ON or OFF repeatedly via the PWM signal.
It is recommended that the PWM frequency is 100Hz or below. This frequency must be determined, fully evaluating
the linearity of brightness to the PWM duty. Brightness control must take place as shown in “b” below if the rush
current causes a problem when the EN pin is ON.
Fig.15 PWM Brightness Control
Fig.16 ON/OFF Pin Control
Fig.17 ON/OFF Pin Control
(4.5V, 100Hz)
(5.0V, 100Hz)
b) Switching the LED Current
Switching the LED current takes place via the external switch.
The constant must be determined, considering the ON resistance of the switch transistor.
Fig18. Brightness Control via the External Transistor
10. Cautions on PCB Design
BD1603NUV is equipped with a double charge pump. As the load current becomes larger, the input current also becomes
larger.
Wire a substrate in a way that the wiring impedance can be minimized. Special care should be taken for the input
voltage, ground, output and flying capacitor connection pin.
Wire the ground of an output capacitor (COUT) near the GND pin of this LSI.
Position a bypass capacitor to be inserted between VIN (input voltage) and GND near this LSI and wire it near the
VIN and GND pins of this LSI.
Heat radiation is controlled by the wiring status to the back metal. Connect it with GND plane as much as possible
by a wide area.
About the FSEL terminal and the VSEL terminal, process fixed logic by the PCB pattern when using it by fixed
logic.
Fig19. How to Ground in PCB Design
BD1603NUV
EN
PWM signal
BD1603NUV
VOUT


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