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© 2022 ROHM Co., Ltd.
65UG067E Rev.001
Dec.2022
User’s Guide
BD83A14EFV-M-001
Operation mode settings
The table below describes the settings for SYNC terminals.
Table 2. Mode settings
Terminal
Setting
Function
SYNC
GND or OPEN
Fixed Frequency Mode Determined by RRT
REG
Spread Spectrum Mode (SSCG) of the Frequency
Determined by RRT
Pulse Input
Synchronizing to the frequency applied in SYNC pin
For unused channels, pull down the LED pin to GND with 10kΩ.
The ISET terminal voltage can be adjusted according to the voltage
input to the ADIM_P terminal.
The LED current can be calculated from the following equation.
𝐼
=
×
× 10
[mA]
𝑉
= 1.089
[V]
(when 90% ≤ D
ADIM_P
≤ 100%)
𝑉
= 1.089 ×
× 𝐷
_
[V]
(when 18% < D
ADIM_P
< 90%)
𝐼
is the output current per 1ch (LED current)
(Recommended operating condition
:
20 mA to 120 mA)
𝑅
is the LED current setting resistor
(Recommended operating condition
:
8.8kΩ to 53kΩ)
𝑉
is the ADIM_P pin input OnDuty
(Recommended operating condition
:
18% to 100%)
Figure 4. Setting LED4 to Unused
Figure 5. I
LED
vs D
ADIM_P
(R
ISET
= 15.1 kΩ)
