SM8135A

SEIKO NPC CORPORATION —2

BLOCK DIAGRAM

PIN DESCRIPTION

Number

Name

I/O

Description

1

C2M

–

Charge pump boost capacitor connection 2M

2

PGND

–

Charge pump ground

3

C1P

–

Charge pump boost capacitor connection 1P

4

C1M

–

Charge pump boost capacitor connection 1M

5

VIN

–

Supply voltage input

6

GND

–

Ground

7

EN

I

Enable/PWM dimming pulse input (High active)

8

ISET

I

LED drive current setting resistor connection

9

DIN4

O

LED drive current control output 4 (connect to ground when not used)

10

DIN3

O

LED drive current control output 3 (connect to ground when not used)

11

NC

–

No connection (leave open circuit for normal operation)

12

GND

–

Ground

13

DIN2

O

LED drive current control output 2 (connect to ground when not used)

14

DIN1

O

LED drive current control output 1 (connect to ground when not used)

15

VOUT

O

LED drive voltage output

16

C2P

–

Charge pump boost capacitor connection 2P

VIN

EN

Control

logic

TSD

Current

control

&

Current

detect

Mode control

&

Output voltage control

&

Protection

C1P

C1M

C2P

C2M

VOUT

DIN1

DIN2

DIN3

ISET

DIN4

GND

GND

Charge pump

NC

(open at any time)

1/ 1.5/ 2

PGND