MB3886PFV データシートの表示（PDF） - Fujitsu

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MB3886PFV

2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type

Fujitsu 

MB3886

Parameter

Sym- Pin

bol No.

(VCC = 12 V, VB = 0 mA, VREF = 0 mA, Ta = +25 °C)

Conditions

Values

Unit

Min

Typ Max

10. Soft-start

Circuit Block Charge current ICS 7, 24



[CS]

−14

−10

−6 µA

Threshold

voltage

VTH1

8, 23

FB = 1.7 V,

Ta = +25 °C

VTH2

8, 23

FB = 1.7 V,

Ta = 0 °C to 85 °C

1.241 1.2500 1.259 V

1.2375 1.2500 1.2625 V

Input bias

current

IB 8, 23 −INE = 0 V

−200

−20

 nA

11. Error

Amp. Block

[Error Amp.]

Voltage gain

Frequency

bandwidth

AV 9, 22 DC

BW 9, 22 AV = 0 dB

60

100

 dB



1500*

 kHz

VFBH 9, 22



Output voltage

VFBL 9, 22



2.4

2.7



V



0.8

1.0 V

Output source

current

ISOURCE

9, 22 FB = 1.7 V



−100 −45 µA

Output sink

current

ISINK 9, 22 FB = 1.7 V

1.5

9.0

 mA

12. PWM

Comparator

Block

[PWM Comp.]

Threshold

voltage

VTL 9, 22 Duty cycle = 0%

VTH 9, 22 Duty cycle = Dtr

1.2

1.3



V



2.02

2.2 V

13. Dead Time

Control Block

[DTC]

Maximum duty

cycle

Dtr 11, 20 RT = 9.1 kΩ, CT = 330 pF

73

78

83 %

Output current

(main side)

ISOURCE1

11, 20

Duty ≤ 5%

(t = 1 / fOSC × Duty)

ISINK1

11, 20

Duty ≤ 5%

(t = 1 / fOSC × Duty)



−700*

 mA



900*

 mA

14. Output

Block [Drive]

Output voltage

(main side)

VOH1

11, 20

OUT1 = −100 mA,

CB = 13.5 V, VS = 12 V

VOL1

11, 20

OUT1 = 100 mA,

CB = 13.5 V, VS = 12 V

Output current

(synchronous

rectification

side)

ISOURCE2

14, 17

Duty ≤ 5%

(t = 1 / fOSC × Duty)

ISINK2

14, 17

Duty ≤ 5%

(t = 1 / fOSC × Duty)

VCB − 2.5 VCB − 0.9 

V

 VS + 0.9 VS + 1.4 V



−750*

 mA



900*

 mA

Output voltage

(synchronous

rectification

side)

VOH2 14, 17 OUT2 = −100 mA

VOL2 14, 17 OUT2 = 100 mA

2.5

4.1



V



1.0

1.4 V

* : Typical design value

8

(Continued)

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