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Datasheet

Datasheet

BD81A34MUV-M BD81A34EFV-M

TSZ02201-0G3G0C600020-1-2

© 2014 ROHM Co., Ltd. All rights reserved.

16.Jan.2014 Rev.002

www.rohm.com

TSZ22111

・15・001

80

90

100

110

120

-40

-25

-10

5

20

35

50

65

80

95

110

125

Ta [

℃]

Ta vs ILED

⊿VOUT=50mV

⊿VOUT=100mV

⊿VOUT=200mV

Description of Blocks

internal circuit and when fixing the pins outside of the IC at a high voltage, as well. The UVLO protection is integrated in

(Typ). For release/cancellation condition and detection condition, please refer to Table 2 on page 11. Connect a capacitor

notably unstable.

2. Constant Current Driver

Table1. LED Control Logic

LEDEN1

LEDEN2

LED1

LED2

LED3

LED4

L

L

ON

ON

ON

ON

H

L

ON

ON

ON

OFF

L

H

ON

ON

OFF

OFF

H

H

ON

OFF

OFF

OFF

If less than four constant-current drivers are used, please make the LED1~4 terminal ‘open’ while the output ‘OFF’ by

LEDEN1 and LEDEN2 terminal. The truth table for these pins is shown above. If the unused constant-current driver output

will be set open without the process of LEDEN1,2 terminals, the ‘open detection’ will be activated. The LEDEN1, 2 terminals

is pulled down internally in the IC and it is low at ‘open’ condition. However, they should be connected to VREG terminal or

fixed to logic HIGH when in use.

(1) Output Current Setting

＜Precaution During Current Setting＞

temperature and the possible LED current maximum value setting, please adjust the ripple voltage in such a way that the LED

current value setting will fall within the range as shown on the graph below. (

:

()

Typ

GAIN

5000

=

[]

[]

(

k

R

V

mA

I

ISET

LED

×

Ω

=

0

.

1