SM8135A
BLOCK DIAGRAM
C1M C1P C2M C2P
Charge pump
1/ 1.ꢁ/ 2
VIN
VOUT
DIN1
Mode control
&
Output voltage control
&
Protection
DIN2
DIN3
Current
control
&
Current
detect
TSD
DIN4
ISET
Control
logic
EN
NC
GND
GND
PGND
(open at any time)
PIN DESCRIPTION
Number
Name
C2M
PGND
C1P
I/O
Description
1
2
–
–
–
–
–
–
I
Charge pump boost capacitor connection 2M
Charge pump ground
3
Charge pump boost capacitor connection 1P
Charge pump boost capacitor connection 1M
Supply voltage input
4
C1M
VIN
5
6
GND
EN
Ground
7
Enable/PWM dimming pulse input (High active)
LED drive current setting resistor connection
8
ISET
DIN4
DIN3
NC
I
9
O
O
–
–
O
O
O
–
LED drive current control output 4 (connect to ground when not used)
LED drive current control output 3 (connect to ground when not used)
No connection (leave open circuit for normal operation)
Ground
10
11
12
13
14
15
16
GND
DIN2
DIN1
VOUT
C2P
LED drive current control output 2 (connect to ground when not used)
LED drive current control output 1 (connect to ground when not used)
LED drive voltage output
Charge pump boost capacitor connection 2P
SEIKO NPC CORPORATION —2
NPC [ NIPPON PRECISION CIRCUITS INC ]
