BD9470AFM・BD9470AEFV

●Pin Numbers/Names/Functions

Pin No.

HSOP-M28

Pin Name

HTSSOP-B28

Symbol

Function

1

8

ISET

LED current setting resistor connection pin

2

9

PWM1

PWM light modulation signal input pin for LED1

3

10

PWM2

PWM light modulation signal input pin for LED2

4

11

PWM3

PWM light modulation signal input pin for LED3

5

12

PWM4

PWM light modulation signal input pin for LED4

6

13

PWM5

PWM light modulation signal input pin for LED5

7

14

PWM6

PWM light modulation signal input pin for LED6

8

15

GND

Ground pin for analog block

9

16

FAIL

Error detection output pin

10

17

OVP

Overvoltage protection detection pin

11

18

LED6

LED output 6

12

19

LED5

LED output 5

13

20

LED4

LED output 4

14

21

LED_GND

Ground pin for LED

15

22

LED3

LED output 3

16

23

LED2

LED output 2

17

24

LED1

LED output 1

18

25

UVLO

Detection pin for Under voltage Lockout prevention

19

26

LSP

LED short-circuit protection voltage setting pin

20

27

STB

Enable pin

21

28

VCC

Power supply pin

22

1

REG58

5.8V regulator output pin / Shutdown timer pin

23

2

CS

DC/DC output current detection pin

OCP detection pin

24

3

N

DC/DC switching output pin

25

4

DCDC_GND

DC/DC GND pin

26

5

RT

DCDC Drive frequency setting connection pin

27

6

FB

Error Amp output pin

28

7

SS

Slow start/

LED protection masking time setting pin

●External Component Recommended Range

Parameter

Symbol

Specification

unit

VCC pin connecting capacity

CVCC

0.1 ～ 100

μF

VCC pin connecting resistance

RVCC

0 ～ *1

kΩ

REG58 pin connecting capacity

C_REG

1.0～470

μF

Soft start setting capacity

CSS

0.001～1.0

μF

RT pin connection resistance range

RRT

30～150

kΩ

ISET pin connecting resistance range

RISET

12.16～75

kΩ

The operating conditions listed above are constants for the IC alone. To make constant setting with practical set devices, utmost attention should be paid.

*1

Please refer to 【3.2 function explanatiob and selection of external components for thes election of VCC

series resistance.

6/35

TSZ02201-0F10C1002000-1-2

© 2013 ROHM Co., Ltd. All rights reserved.

19.Oct.2013 Rev.003

www.rohm.com

TSZ22111・15・001