BD9763FVM Datasheet, PDF (3/12 Pages) Rohm – Single-output Step-up,High-efficiency Switching Regulator (Controller Type)

BD9763FVM
Technical Note
●Reference data (Unless otherwise specified, Ta=25℃)
V RE F　 vol tage　 vs .　 A mbi ent　 temperature
2 .5 3
2 .5 2
2 .5 1
2 .5
2 .4 9
2 .4 8
2 .4 7
-60 -40 -20 0 20 40 60 80 100 120 140
Ambient　temperature　 [℃]
Fig.1 VREF voltage – Ambient temperature
Oscillating　frequency　vs.　Timing　resistance
10000
1000
100
1
10
100
1000
Timing　resistance　(RT) 　[kΩ]
Fig.2 Oscillating frequency – Timing resistance (RRT)
Oscillating　frequency　vs.　Ambient　temperature
Oscillating　frequency　vs.　Ambient　temperature
650
640
630
RT=24kΩ
620
610
600
590
580
570
560
550
-60 -40 -20 0
20 40 60 80 100 120 140
Ambient　temperature　 [℃]
Fig.3 Oscillating frequency – Ambient temperature
(RT=24kΩ)
1200
1180
1160
1140
1120
1100
1080
1060
RT=10kΩ
1040
1020
1000
-60 -40 -20
0 20 40 60 80 100 120 140
Ambient　temperature　 [℃]
Fig.4 Oscillating frequency – Ambient temperature
(RT=10kΩ)
●Block diagram
VCC
VREF
RT
1
4
8
U.V.L.O
Vref
TRI
INV 5
FB ₆
Error
1.0V_Amp
T.S.D
Clamper
VREF
PWM
Vdt COMP
7
CTL/SS
Fig.5
VCC
2 OUT
3
GND
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3/11
2009.05 - Rev.A