R1280D002X Datasheet, PDF (13/26 Pages) RICOH electronics devices division – 2CH PWM DC/DC Controller

q Test Circuit 17
q Test Circuit 18
C1
EXT1 EXT2
OSCILLOSCOPE
C1
GND VIN
EXT1 EXT2
GND _VIN
CE Vrefout
C2
CE Vrefout
C2
DTC1 DTC2
DTC1 DTC2
C3
C4
VFB1 VFB2
OSCILLOSCOPE
V_FB1 VFB2
OSCILLOSCOPE
Typical Characteristics shown in the following pages are obtained with test circuits shown above.
q R1280D002A/C
Test Circuit 1,2: Typical Characteristic 4)
Test Circuit 3: Typical Characteristic 6)
Test Circuit 4: Typical Characteristic 7)
Test Circuit 5: Typical Characteristic 8)
Test Circuit 6: Typical Characteristics 9) 10)
Test Circuit 7: Typical Characteristic 11)
Test Circuit 8: Typical Characteristic 12)
Test Circuit 9: Typical Characteristics 13) 14)
q R1280D002B
Test Circuit 10,11: Typical Characteristics 4) 5)
Test Circuit 12: Typical Characteristic 6)
Test Circuit 13: Typical Characteristic 7)
Test Circuit 14: Typical Characteristic 8)
Test Circuit 15: Typical Characteristics 9) 10)
Test Circuit 16: Typical Characteristic 11)
Test Circuit 17: Typical Characteristics 15) 16)
Test Circuit 18: Typical Characteristics 17) 18)
Standard Circuit Example: Typical Characteristics 1) 2) 3) 19) 20)
Note) Capacitors' values of test circuits
Capacitors: Ceramic Type:
C1=4.7µF, C2=1.0µF, C3=C4=1000pF
Efficiency η(%) can be calculated with the next formula:
η=(VOUT1×IOUT1+VOUT2×IOUT2)/(VIN×IIN)×100
Rev. 1.10
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