MD3221N 데이터 시트보기 (PDF) - Unspecified

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MD3221N

DC-DC Converter Power IC

Unspecified 

Item

Soft start

Current at soft start pin

Error amp

Error amp reference voltage

Over-Current protection detector

Threshold current at ON resistance detection

Threshold voltage at external resistance detection

Timer latch circuit

Timer current

Voltage at S/S pin prior to timer operation

Latch threshold voltage

Output voltage detector

Output voltage detect accuracy (set at 0.8V)

Output voltage detect accuracy (set at 2.5V)

Output voltage detect accuracy (set at 3.3V)

Over temperature protection detector

Overheat protection operation temperature

Condition

Vcc = 5V

Vcc = 5V

Vcc = 5V

Vcc = 5V

Vcc = 5V

Vcc = 5V

Vcc = 5V

Vcc = 4.5〜20V

Vcc = 4.5〜20V

Vcc = 4.5〜20V

−

Min.

Typ.

Max.

Unit

-3

-2.5

-2

μA

0.784

0.800

0.816

V

3

−

−

A

85

100

115

mV

-40

-33

-26

μA

2.75

2.9

3.05

V

3.3

3.45

3.6

V

0.784

0.800

0.816

V

2.425

2.500

2.575

V

3.200

3.300

3.400

V

−

140

−

℃

◆Internal Block Diagrams

● Block Diagram

Vcc

Vref

Vboot VB

VGH VDD

6

2

7 24

23 18~21

R/C 1

(L.Active)

ON/OFF

CONTROL

Vref

S/S

32

BANDGAP

REFERENCE

1.26V±1%

UVLO

-

THERMAL

SHUTDOWN

VCC +

SRQ

LATCH

LATCH

QRS

CURRENT

LIMIT1

+

-

ampOUT 28

ERROR-AMP

amp- 29

PWM-COMP

OCL-

OSC

CURRENT

LIMIT2

SRQ

LATCH

Vref

VOUT

CURRENT

LIMIT3

SRQ

LATCH

INVL

VOUT

11~14

4,26

GND

3

31 30

25 27

OSC

ampIN

OCL-

2.5V/3.3V

OCL+

5

8

9

16

LC

P.GND1

VGL P.GND2

※N/C : 10,15,17,22

※   (Resistance)

6

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