SM8135A
LED × 3, I
= 20mA, PWM Pulse Input Dimming on EN
LED MAX
C1 = 1µF
C2 = 1µF
C1M C1P
C2M C2P
2.7 to 4.6V
VIN
VOUT
DIN1
Charge pump
1/ 1.ꢁ/ 2
C4 = 1µF
C3 = 1µF
MAX 20mA
3
Mode control
&
Output voltage control
&
DIN2
DIN3
Protection
Current
control
&
Current
detect
TSD
DIN4 (connect to ground)
ISET
Control
logic
EN
10kHz to 100kHz
RSET = 120kΩ
NC
(open at any time)
GND
GND
PGND
Note. If the driving LED is less than 4 pcs, unused DIN pins should be connect to GND.
Dimming and ON/OFF control is performed using PWM pulse input on EN with a maximum LED current determined by resistor
RSET (see P.6 “Setting LED current using PWM signal input on EN”).
The PWM control signal duty ratio must be in the range 10 to 100% (see “Electrical Characteristics”).
The PWM control signal frequency must be in the range 10kHz to 100kHz (see “Electrical Characteristics”).
SEIKO NPC CORPORATION —17
NPC [ NIPPON PRECISION CIRCUITS INC ]
