MB3889 Ver la hoja de datos (PDF) - Fujitsu

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componentes Descripción

Fabricante

MB3889

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

Fujitsu 

MB3889

Parameter

Threshold

voltage

10. Error Amp

Block

[Error Amp]

Input bias

current

Voltage gain

Frequency

bandwidth

Output voltage

Output source

current

Output sink

current

Symbol

VTH1

VTH2

IB

AV

BW

VFBH

VFBL

ISOURCE

ISINK

Pin

No.

1, 15

1, 15

1, 15

2, 14

2, 14

2, 14

2, 14

2, 14

2, 14

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

Conditions

Value

Unit

Min

Typ

Max

FB = 2.4 V,

Ta = + 25 °C

1.221 1.230 1.239 V

FB = 2.4 V,

Ta = 0 °C to + 85 °C

1.218 1.230 1.242 V

−INE = 0 V

− 730 − 110

 nA

DC

60

100

 dB

AV = 0 dB



1.5*

 MHz



3.2

3.4



V





40

200 mV

FB = 2.4 V



−2

− 1 mA

FB = 2.4 V

150

250

 µA

11. PWM

Comparator

Block

[PWM Comp.]

Threshold

voltage

VTL 2, 14 Duty cycle = 0 %

VTH 2, 14 Duty cycle = Dtr

1.7

1.8



V



2.86

3.00 V

12. Dead Time

Control Block

[DTC]

13. Output

Block

[Drive]

Maximum duty

cycle

Output

current

(main side)

Output voltage

(main side)

Output current

(synchronous

rectification

side)

Dtr 17, 29 RT = 47 kΩ

OUT1 = 12 V, CB = 17 V,

ISOURCE1

17, 29

VS = 12 V,

Duty ≤ 5 %

(t = 1/ fOSC × Duty)

ISINK1

OUT1 = 17 V, CB = 17 V,

17, 29

VS = 12 V,

Duty ≤ 5 %

(t = 1/ fOSC × Duty)

VOH1

17, 29

OUT1 = − 100 mA,

CB = 17 V, VS = 12 V

VOL1

17, 29

OUT1 = 100 mA,

CB = 17 V, VS = 12 V

OUT2 = 0 V,

ISOURCE2 19, 27 Duty ≤ 5 %

(t = 1/ fOSC × Duty)

ISINK2

OUT2 = 5.1 V,

19, 27 Duty ≤ 5 %

(t = 1/ fOSC × Duty)

*: Standard design value

75





VCB

− 2.5







81

− 700*

900*

VCB

− 0.9

VS

+ 0.9

− 750*

900

87

%

 mA

 mA



V

VS

+ 1.4

V

 mA

 mA

(Continued)

9

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