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BD1604MUV, BD1604MVV
Technical Note
● Cautions on layout pattern
When designing a layout pattern, lay out wires to a power line in a way that the layout pattern impedance can be minimized
and connect a bypass capacitor if necessary.
LED
VOUT
RSET
1 μ F
LED
VBAT
1 μ F
1 μ F 1 μ F
GND
Wiring from the VBAT pin
to Cin must meet a low
impedance.
LED
LED
The GND pin and
Cin must be
placed nearby.
GND
Fig.15 Example of BD1604MUV Layout Pattern
(Front, Top View)
Fig.16 Example of BD1604MUV Layout Pattern
(Rear, Top View)
● LED Current Control
There are two methods for LED current control. One method uses an external PWM signal and another changes the
resistance value of RREF (RSET) connected to the IREF (ISET) pin. For details, refer to the respective circuit examples.
Don’t make the setting of 30mA or more per channel for BD1604MUV/MVV.
1) Controlling the current by using the PWM method
The PWN signal must be input to the EN pin.
PWM signal “H” level: 1.4V or more
PWM signal “L” level: 0.4V or less
When PWM Duty is used in an area of 10% or less, the PWM cycle must be a range from 100Hz to 200Hz. When extremely
high-speed PWM control takes place, the linearity of LED current value to PWM duty is lost if the PWM duty is small (for
example, 10% or less) or it is large (for example, 90% or more).
2) Controlling the current by changing the SET resistance value
Rset-Rset1=Rset2// … //Restn.
This means that the current can be adjusted more finely by adding the types of resistance values.
ILED=480/Rset [A]
The approximate LED current can be obtained from the above expression. Because the current of 30mA or more per LED is not
permitted, make the setting in a way that the Rset resistance value can be maintained to be greater than or equal to16k ? .
Battery
C1
C2
Battery
C1
C2
Cin
VBAT
×1, ×1.5, ×2
Charge pump
VOUT
Cin
VBAT
×1, ×1.5, ×2
Charge pump
VOUT
Charge Pum p
Mode C ontrol
Over Voltage
Protect
Cout
Charge Pum p
Mode C ontrol
Over Voltage
Protect
Cout
EN
OSC
EN
OSC
PWM signal input (ON
for the signal set to High) SEL0
Vout Control
SEL0
Vout Control
SEL1
SEL2
Control
TSD
LED1
LED2
LED3
SEL1
SEL2
Control
TSD
LED1
LED2
LED3
LED4
LED4
Rset
ISET
ISET
Resistor Driver
Current Driver
Rsetn
Rset2
ISET
Rset1
ISET
Resistor Driver
Current Driver
GND
Fig.17 Controlling the Current
by Using the PWM Method
GND
Fig.18 Controlling the Current
by Changing the Resistance Value
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
7/10
2011.06 - Rev.B
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