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LB1847 데이터시트(PDF) 5 Page - Sanyo Semicon Device |
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LB1847 데이터시트(HTML) 5 Page - Sanyo Semicon Device |
5 / 15 page LB1847 No.5982-5/15 Pin Function Pin No. Pin name Function 1 MD Sets the OFF time for FAST mode and SLOW mode in MIX DECAY. Setting input range: 4V to 1.5V. 2 13 VREF1 VREF2 Output set current reference supply pin. Setting voltage range: 0V to 3V. 3 12 CR1 CR2 Output OFF time setting pin for switching operation. 4 11 E1 E2 Pin for controlling the set current with sensing resistor RE. 5 10 DECAY1 DECAY2 SLOW mode/FAST mode selector pin. DECAY2 SLOW DECAY: H FAST DECAY: L 6 7 8 9 OUTA OUTA OUTB OUTB Output pin. 14 VBB Output stage supply voltage pin. 15 GND Ground pin. 27 16 PHASE1 PHASE2 Output phase selector input pin 26 17 ENABLE1 ENABLE2 Output ON/OFF setting input pin. 22,23 24,25 21,20 19,18 IA4,IA3 IA2,IA1 IB4,IB3 IB2,IB1 Output set current digital input pin. 15-stage voltage setting. 28 VCC Logic block supply voltage pin Truth Table PHASE ENABLE OUTA OUTA H L H L L L L H − H OFF OFF Set Current Truth Table IA4 IA3 IA2 IA1 Set current Iout Current ratio 1 1 1 1 11.5/11.5 × VREF/3.04RE = Iout 100 1 1 1 0 11.0/11.5 × VREF/3.04RE = Iout 95.65 1 1 0 1 10.5/11.5 × VREF/3.04RE = Iout 91.30 1 1 0 0 10.0/11.5 × VREF/3.04RE = Iout 86.95 1 0 1 1 9.5/11.5 × VREF/3.04RE = Iout 82.61 1 0 1 0 9.0/11.5 × VREF/3.04RE = Iout 78.26 1 0 0 1 8.5/11.5 × VREF/3.04RE = Iout 73.91 1 0 0 0 8.0/11.5 × VREF/3.04RE = Iout 69.56 0 1 1 1 7.0/11.5 × VREF/3.04RE = Iout 60.87 0 1 1 0 6.0/11.5 × VREF/3.04RE = Iout 52.17 0 1 0 1 5.0/11.5 × VREF/3.04RE = Iout 43.48 0 1 0 0 4.0/11.5 × VREF/3.04RE = Iout 34.78 0 0 1 1 3.0/11.5 × VREF/3.04RE = Iout 26.08 0 0 1 0 2.0/11.5 × VREF/3.04RE = Iout 17.39 * Current ratio (%) is the calculated set current value. Current Decay Switching Truth Table Current decay mode DECAY pin MD pin Output chopping SLOW DECAY H L Upper-side chopping FAST DECAY L L Dual-side chopping MIX DECAY L 4V to 1.5V input voltage setting CR voltage > MD: dual-side chopping CR voltage < MD: upper-side chopping |
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