KA3505 查看數據表（PDF） - Fairchild Semiconductor

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KA3505

PC SMPS Supervisory IC

Fairchild Semiconductor 

KA3505

Internal Block Diagram

VS33 VS5 VS12

RI

1

2

3

11

Vcc

FPO PGI

5

6

4

IS12 14

IS5 15

O VP

Detector

UVP

Detector

Internal

Bias

Start Up

Bandgap

Reference

Vref

VBG =1.25V

RI=62KΩ

Ir ef (20µA)

Vref

ICHG(PROT)=20 µA

COMP4

S

Q

Q1

R

COMP1

Iref × 5

(100µA)

COMP2

Iref × 5

(100µA)

1.8~ 0.6V

COMP5

1 .4 V

On/Of f Delay

Con t rol

COMP6

1.8~ 0.6V

Vref

ICHG(PG)=15µA

9 PGO

UVP Detector

Ou tp u t

COMP8

Q3

COMP7

1.8 ~ 0.6V

Q2

1.25V

IS33 16

COMP3

Iref × 5

(100µA)

13

7

TPROT PSON

8

TPSON

12

GND

10

TPG

Absolute Maximum Ratings

Parameter

Supply Voltage

Input Voltage

FPO Voltage

FPO Maximum Current

Operating Temperature

Storage Temperature Range

Power Dissipation

Symbol

Value

Unit

VCC

15 ~ 30

V

Vinput

30

V

VFPO

30

V

IFPO

20

mA

Topr

-25 ~ +85

°C

Tstg

-65 ~ +150

°C

PD

1

W

2

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