MB3885 Datasheet, PDF (8/29 Pages) Fujitsu Component Limited. – 1-channel DC/DC Converter IC with Synchronous Rectifier

MB3885
Parameter
Symbol Pin No.
(VCC = 12 V, VB = 0 mA, VREF = 0 mA, Ta = +25 °C)
Conditions
Min.
Value
Typ.
Unit
Max.
7.
Error Amp
Block
[Error Amp.]
Frequency
band width
BW
Output voltage
VFBH
VFBL
Output source
current
ISOURCE
Output sink
current
ISINK
7 AV = 0 dB
7

7

7 FB = 1.6 V
7 FB = 1.6 V

800*
 kHz
2.2
2.5

V

0.8
1.0 V
 −100 −45 µA
1.5
9.0
 mA
8.
PWM
Comparator Threshold
Block
voltage
[PWM Comp.1,
PWM Comp.2]
VTL
7 Duty cycle = 0%
VTH
7 Duty cycle = Dtr
1.2
1.3

V

1.81 2.0
V
9.
Dead time
Adjustment
Block
[DTC]
10. Output
Block
[Drive]
Maximum
duty cycle
Dtr
13
RT = 10 kΩ,
CT = 470 pF
Output current
(main side)
ISOURCE1
ISINK1
Output voltage
(main side)
VOH1
VOL1
Output current
(synchronous
rectifier side)
ISOURCE2
ISINK2
Output voltage
(synchronous
rectifier side)
Diode voltage
VOH2
VOL2
VD
13
Duty ≤ 5%
(t = 1 / fOSC × Duty)
13
Duty ≤ 5%
(t = 1 / fOSC × Duty)
13
OUT1 = −100 mA,
CB = 17 V, VS = 12 V
13
OUT1 = 100 mA,
CB = 17 V, VS = 12 V
15
Duty ≤ 5%
(t = 1 / fOSC × Duty)
15
Duty ≤ 5%
(t = 1 / fOSC × Duty)
15 OUT2 = −100 mA
15 OUT2 = 100 mA
12 VB = 10 mA
85
90
95 %
 −700*  mA

900*
 mA
CB − CB −
2.5
0.9

V

VS +
0.9
VS +
1.4
V
 −750*  mA

900*
 mA
2.5
4.1

V

1.0
1.4 V

0.9
1.1 V
* : Standard design value
(Continued)
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