LB1847 datasheet(4/16 Pages) SANYO

4 / 16 page

LB1847

No. 5982-4/16

PHASE

ENABLE

LLL

HOFF

OFF

Truth table

Set current truth table

* Current ratio (%) is the calculated set current value.

Current decay switching truth table

Current decay mode

DECAY pin

MD pin

Output chopping

SLOW DECAY

Top-side chopping

FAST DECAY

Dual-side chopping

4V to 1.5V input

CR voltage > MD : dual-side chopping

voltage setting

CR voltage < MD : top-side chopping

MIX DECAY

OUTA

Set current Iout

Current ratio (%)

1111

100

1110

95.65

1101

91.30

1100

86.95

1011

82.61

1010

78.26

1001

73.91

1000

69.56

0111

60.87

0110

52.17

0101

43.48

0100

34.78

0011

26.08

0010

17.39

IA4IA3

IA2

IA1

11.5/11.5 X VREF/3.04RE=Iout

11.0/11.5 X VREF/3.04RE=Iout

10.5/11.5 X VREF/3.04RE=Iout

10.0/11.5 X VREF/3.04RE=Iout

9.5/11.5 X VREF/3.04RE=Iout

9.0/11.5 X VREF/3.04RE=Iout

8.5/11.5 X VREF/3.04RE=Iout

2.0/11.5 X VREF/3.04RE=Iout

8.0/11.5 X VREF/3.04RE=Iout

7.0/11.5 X VREF/3.04RE=Iout

6.0/11.5 X VREF/3.04RE=Iout

5.0/11.5 X VREF/3.04RE=Iout

4.0/11.5 X VREF/3.04RE=Iout

3.0/11.5 X VREF/3.04RE=Iout

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