BD83A44EFV-M BD83A44MUF-M
Pin Configuration
(TOP VIEW)
(TOP VIEW)
1
24
23
22
21
20
19
18
17
16
15
14
13
REG
VCC
24
23
22
21
20
19
2
GND
CSH
3
1
2
3
4
5
6
18
17
16
15
14
13
PWM
LDSW
N.C.
EN
LDSW
N.C.
4
PWM
SYNC
5
SYNC
SW
ADIM
SW
6
N.C.
ADIM
EXP-PAD
EXP-PAD
COMP
7
COMP
PGND
PLSET
FAIL
PGND
PLSET
FAIL
8
RT
RT
9
ISET
ISET
10
LGND
OVP
11
LED1
LED4
LED3
7
8
9
10
11
12
12
LED2
BD83A44EFV-M
BD83A44MUF-M
Pin Descriptions
Pin No.
EFV MUF
Signal Type
Pin Name
Function
(Note 1)
PWM dimming signal: The LED current can be controlled according to On Duty of the input
PWM signal.
4
5
1
2
PWM
I
I
External synchronization frequency input / SSCG setting: The internal oscillation
frequency can be externally synchronized by inputting an external clock signal to the SYNC
pin before the Self Diagnosis is completed. When using spread spectrum mode (SSCG),
short the SYNC pin and the REG pin beforehand.
SYNC
DC dimming setting: ISET pin voltage can be changed according to the voltage input to the
ADIM pin. When using only PWM dimming, short the ADIM pin with the REG pin
6
7
3
4
ADIM
I
Phase compensating capacitor connection: The reference voltage and LED pin voltage
generated by REF Voltage block are compared and output by Error AMP. Connect a filter for
phase compensation.
COMP
A
Resistor connection for oscillation frequency setting: DC/DC oscillation frequency (fOSC
can be set by connecting a resistor (RRT) between the RT pin and the GND pin.
)
8
5
6
7
8
9
RT
A
A
P
P
P
P
P
Resistor connection for LED current setting: LED current (ILED) can be set by connecting
a resistor (RISET) between the ISET pin and the GND pin.
9
ISET
LGND
LED1
LED2
LED3
LED4
Large current ground 1: GND of the current driver (the LED1, LED2, LED3, and LED4
pins).
10
11
12
LED cathode connection 1: Open drain output of the current driver ch 1 for LED drive.
Connect to the LED cathode.
LED cathode connection 2: Open drain output of the current driver ch 2 for LED drive.
Connect to the LED cathode.
LED cathode connection 3: Open drain output of the current driver ch 3 for LED drive.
Connect to the LED cathode.
13 10
14 11
LED cathode connection 4: Open drain output of the current driver ch 4 for LED drive.
Connect to the LED cathode.
Overvoltage protection and short circuit protection detection : When OVP pin voltage
rises to 1.21 V or more, the overvoltage protection (OVP) is activated, and DC/DC converters
are switched OFF. If OVP pin voltage is 0.1 V or less for 3.56 ms, Short Circuit Protection
(SCP) is activated, and both DC/DC converter and the current driver are turned OFF.
15 12
16 13
OVP
FAIL
A
Error output flag: Outputs the status of protective operation from the FAIL pin. Since this
pin is an open drain output, use a resistor to pull it up to the REG pin, etc.
O
(Note 1) A: Sensitive signal such as detect and reference, I: Input signal from other units, O: Output signal to other units, P: Large current signal susceptible to
impedance, including transient current.
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