KA3505_技术文档

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KA3505

PC SMPS Supervisory IC

Features

Description

• PC Power Supply Output Monitor Circuitry

• Few External Components

• Over Voltage Protection for 3.3V/5V/12V Output

• Under Voltage Protection for 3.3V/5V/12V Output With

Delay Time

• Over Current Protection for 3.3V/5V/12V Output With

Delay Time

• Fault Protection Output With Open Collector Output

• Power Supply on/off Delay Time Control (PSON)

• Power Good Signal Generator With Hysteresis

• Open Collector PG Output

The KA3505 is complete output supervisory circuitry

intended for use in the secondary side of the switched mode

power supply. It provides all the functions necessary to

monitor and control the output of the power supply system.

Power good signal generator, Remote on and off control,

some precision protection features against over-voltage,

under-voltage and over-current are implemented. It directly

senses all the output rails for OVP and UVP without any

external dividers. As for output control, Power Good Output

(PGO) and Fault Protection Output (FPO) are also included.

Utilizing a minimum number of external components, the

KA3505 offers a simple and cost effective solution, greatly

reducing PCB board space for power supply system.

• 300ms Power Good Delay

OCP (Over Current Protection)

• Current Sense Setting Function With RI

• Latch Function Controlled by PSON and Protection Input

• 16-Pin Dual In-line Package

It has precision OCP functions for +3.3V, +5V, +12V

outputs. The block is made up of three comparators with

current source setting function. Two inputs of each OCP

comparator are connected to both sides of output inductor that

is located in the secondary output of SMPS.

FPO (Fault Protection Output)

Fault Protection Output indicates the fault condition as

protection signal. When fault state occurs, the main power is

to be turned-off and the PGO signal goes LOW.

OVP (Over Voltage Protection)

It has OVP functions for +3.3V, +5V, +12V outputs. The

circuit is made up of a comparator with three detecting inputs.

NORMAL = "LOW", FAULT = "HIGH"

UVP (Under Voltage Protection)

PGO (Power Good Output)

It also has UVP functions for +3.3V, +5V, +12V outputs. The

block is made up of a comparator with three detecting inputs.

Power Good Signal Generator is to monitor the voltage level

of power supply for safe operation of a microprocessor

having some delay time at turn-on. The delay time is

programmed by a timing capacitor connected to TPG pin of

KA3505. The power good output should be low state before

the output voltage is out of regulation at turn-off.

Remote ON/OFF

Remote on/off section is used to control SMPS externally.

If a high signal is supplied to the remote on/off input, FPO

signal becomes a high state and all secondary outputs are

grounded. The remote on/off signal is transferred with some

on-delay and off-delay time of 8ms, 24ms respectively with

0.1µF external capacitor.

NORMAL = "HIGH", FAULT = "LOW"

16-DIP

1

Rev. 1.0.1

KA3505

Internal Block Diagram

VS33

VS5 VS12

RI

Vcc

FPO PGI

1

2

3

6

4

5

11

Start Up

Internal

Bias

Bandgap

Reference

OVP

Vref

Detector

VBG=1.25V

KΩ

RI=62

µ

Iref(20 A)

ICHG(PG)=15 µA

UVP

9

PGO

Detector

COMP8

UVP Detector

Output

Vref

Q3

S

Q

R

ICHG(PROT)=20

A

µ

Q1

COMP7

1.8 ~ 0.6V

COMP4

Q2

14

15

IS12

IS5

1.8~ 0.6V

COMP1

×5

1.25V

Iref

(100µA)

COMP6

On/Off Delay

Control

COMP5

1.4V

COMP2

1.8~ 0.6V

Iref × 5

(100µA)

16

IS33

COMP3

Iref × 5

(100µA)

13

7

8

12

10

PSON

GND

T^PROT

T^PSON

T^PG

Absolute Maximum Ratings

Parameter

Symbol

Value

15 ~ 30

30

Unit

V

Supply Voltage

V

CC

Input Voltage

Vinput

V

FPO Voltage

V

30

V

FPO

FPO Maximum Current

Operating Temperature

Storage Temperature Range

Power Dissipation

I

20

mA

°C

W

FPO

Topr

Tstg

-25 ~ +85

-65 ~ +150

1

P

D

2

KA3505

Pin Assignments : KA3505

1

16

15

IS33

IS5

VS33

2

VS5

3

14

13

12

11

10

9

VS12

IS12

K

A

3

5

0

5

4

PGI

TPROT

5

GND

Vcc

6

RI

FPO

7

T

PG

PSON

8

PGO

TPSON

3

KA3505

Pin Definitions

Pin No.

Name

Pin Function Description

Over and Under Voltage Protection Input for the 3.3V. It directly senses the 3.3V

rail without any external divider.

1

V33

Over and Under Voltage Protection Input for the 5V. It directly senses the 5V rail

without any external divider.

2

3

V5

Over and Under Voltage Protection Input for the 12V. It directly senses the 12V

rail without any external divider.

V12

PGI

Power Good Signal Generator Input. It should be supplied from a bulk

dependent voltage in order to detect power on and off state.

4

5

V

CC

Supply voltage. Its recommended operating voltage is ranged from 15V to 30V.

Fault Protection Output (Open Collector Output). This pin indicates the fault

condition. When fault state occurs, the PGO signal goes Low.

Normal = ’Low", Fault = "High".

6

7

FPO

Remote on/off input. It does TTL operation and its threshold voltage is 1.4V. In

case of open circuit, the voltage at this pin is High (5.0V). If PSON = "Low", then

FPO = "Low". It means the main SMPS is working. When PSON = "High or

Open", then FPO = "High" and the main SMPS stops to work.

PSON

Timing pin for PSON delay. Ton/Toff=8ms/24ms (Typ.) with Cpson=0.1µF

externally. PSON On Delay Time (Ton) is measured as PSON input goes Low to

High. PSON Off Delay Time (Toff) can be measured reversely.

8

9

T

PSON

Power Good Output Signal (Open Collector).

PGO = "High" means "Power Good" for operation and PGO = "Low" means

"Power Fail".

PGO

Timing pin for PGO delay. TPG = 270ms (Typ.) with CPG = 2.2µF externally. The

high/low threshold voltages are 1.8V/0.6V and the voltage of pin10 would be

charged up to 2.9V for noise margin.

10

T

PG

OCP current sense setting pin. The reference voltage at this pin is set to 1.25V

internally.You can fix the OCP reference current by using RI resistor.

11

12

RI

GND

Ground

Timing pin for under voltage protection and over current protection blank-out

time. Its threshold voltage is 1.8V and clamped at 2.9V after full charging. Target

of delay time is 38ms and it is realized through external capacitor (C=0.47µF).

13

T

PROT

Current sense input for +12V. This pin is connected to the current sensing

resistor or inductor. You can define OCP offset voltage for +12V by using RI

resistor externally. If you connected RI resistor of 62kΩ at Pin11 to ground, the

reference current(Iref) should be 20µA. After that, you can make a constant OCP

offset voltage (V

OFFSET

In case the voltage drop (=I . × R ) of the sense resistor or inductor is larger

O 12

= R × 5 × Iref).

O

14

IS12

S

than offset voltage, FPO becomes "High" after some delay time and the main

SMPS is turned-off. So the over current level is determined by following

equation. (I

= V

/ R )

OFFSET S

O.12

See application note for details.

Current sense input for +5V. You can make the +5V OCP function as previous

method in IS12 (Pin14).

15

16

IS5

Current sense input for +3.3V. You can also make the +3.3V OCP function as

previous method in IS12 (Pin14).

IS33

4

KA3505

Electrical Characteristics

(V

CC

= 20V, -25°C < Ta < 85°C, unless otherwise specified)

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

PROTECTION SECTION

Over Voltage Protection for 3.3V

Over Voltage Protection for 5V

Over Voltage Protection for 12V

Under Voltage Protection for 3.3V

Under Voltage Protection for 5V

Under Voltage Protection for 12V

Offset Voltage of OCP Comparator

Charging Current for OCP, UVP Delay

3.3, 5, 12V Over Current Delay Time

3.3, 5, 12V Under Voltage Delay Time

V

= 0V

-

3.9

5.7

13.6

2.69

4.1

9.8

-3

4.1

6.1

14.3

2.83

4.3

10.3

-

4.3

6.5

15.0

2.97

4.5

10.8

3

V

OVP33

PSON

V

OVP5

OVP12

UVP33

V

UVP5

V

UVP12

V

mV

µA

msec

offset

CHG(PROT)

I

-15

24

-21

38

-30

57

T

C = 0.47µF

D(OCP)

T

24

38

57

D(UVP)

POWER SUPPLU ON/OFF SECTION (PSON) ^Note

PSON Input Threshold Voltage

PSON Open Voltage

PSON Input Low Current

ON Delay Time

V

PSON: "H" → "L"

1

4

1.4

-

1.8

5.25

-1.6

14

V

TH(PSON)

V

PSON: Open

V

OPEN(PSON)

I

V

PSON

= 0V

-

mA

LOW(PSON)

T

C = 0.1µF

4

8

msec

ON(PSON)

OFF Delay Time

T

16

24

34

OFF(PSON)

FPO SECTION

FPO Saturation Voltage

FPO Leakage Current

V

I

= 10mA

FPO

-

0.2

0.4

1

V

SAT(FPO)

V

= 20V

0.01

µA

LKG(FPO)

FPO

Electrical Characteristics ^(Continued)

(V

CC

= 20V, -25°C < Ta < 85°C, unless otherwise specified)

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

POWER GOOD SECTION

PG Input Threshold Voltage

Hysteresis Voltage 1

V

PG: "H"→"L"

COMP7

1.20

10

1.25

40

1.30

80

V

mV

V

IN(PG1)

HY1

Hysteresis Voltage 2

HY2

COMP4, 6, 8

-

0.6

-9

1.2

-14

270

0.2

-

Charging Current for PG Delay

PG Delay Time

I

-22

450

0.4

µA

msec

V

CHG(PG)

T

C = 2.2µF

150

-

D(PG)

PG Output Saturation Voltage

TOTAL DEVICE

V

I

= 10mA

-

SAT(PG)

PG

Stand-by Supply Current

I

-

5

10

mA

CC

Note:

1. It does TTL operation and its threshold voltage is 1.4V.

2. Power Supply ON Delay Time (Ton) is measured as PSON input goes "Low" to "High".

3. Power Supply OFF Delay Time (Toff) is measured as PSON input goes "High" to "Low".

5

KA3505

Timing / Housekeeping / Control

Ton Delay

Toff Delay

Remote on/off

Output Voltage

(3.3V, 5V, 12V)

PG

Delay

PG

Delay

PGO

FPO

Operating Mode

Stand-by Mode

Vcc

PGI Detection

Point

Main Power Switch ON

Power on/off

OFF

6

KA3505

Test Circuit

VS33

VS5

VS12

PGI

IS33

IS5

1

2

3

4

5

6

7

16

15

14

13

K

A

3

5

0

5

IS12

T_PROT

0. 47µF

Vcc

GND 12

20V

10

ΚΩ

RI

FPO

11

62

ΚΩ

2.2µF

PSON

T^PG10

S

5V

0.1µF

8 TPSON

PGO 9

1

ΚΩ

7

KA3505

Typical Characteristics

Icc

VOVP33

0.006

20

15

10

5

0.005

Icc=4.881mA

Vcc=20V

0.004

0.003

0.002

0.001

0.000

0

10

20

30

40

3.4

3.6

3.8

4.0

4.2

4.4

4.6

Vcc[V]

3.3V Output Voltage[V]

Figure 2. Over Voltage Protection for 3.3V

Figure 1. V

- I

CC CC

VOVP5

VOVP12

20

15

10

5

20

15

10

5

0

5.4

5.6

5.8

6.0

6.2

6.4

6.6

13.0

13.5

14.0

14.5

15.0

5V Output Voltage[V]

12V Output Voltage[V]

Figure 3. Over Voltage Protection for +5V

Figure 4. Over Voltage Protection for +12V

VUVP5

VUVP33

20

15

10

5

15

10

5

0

2.5

2.6

2.7

2.8

2.9

3.0

4.0

4.1

4.2

4.3

4.4

4.5

3.3V Output Voltage[v]

5V Output Voltage[V]

Figure 5. Under Voltage Protection for +3.3V

Figure 6. Under Voltage Protection for +5V

8

KA3505

Typical Characteristics ^(Continued)

VTH.PSON

VUVP12

20

15

10

5

20

15

10

5

0

9.4

9.6

9.8

10.0

10.2

10.4

10.6

10.8

11.0

11.2

0

1

2

3

4

5

12V Output Voltage[V]

PSON Voltage[V]

Figure 7. Under Voltage Protection for +12V

Figure 8. PSON Input Threshold Voltage

ION.OFF

PGI

0.000010

0.000005

0.000000

-0.000005

-0.000010

-0.000015

-0.000020

20

15

10

5

0

1.0

1.1

1.2

1.3

1.4

1.5

0

1

2

3

4

5

PGI Voltage[V]

PSON Voltage[V]

Figure 9. PS On/Off Delay Current

Figure 10. PG Input Threshold Voltage

HY1

HY2

20

15

10

5

20

15

10

5

0

1.0

1.1

1.2

1.3

1.4

1.5

0.0

0.5

1.0

1.5

2.0

2.5

PGI Voltage[V]

TPG Voltage[V]

Figure 11. Hysteresis Voltage 1

Figure 12. Hysteresis Voltage 2

9

KA3505

Voltage Mode Application Schemata

D1

D3

D5

L1

L2

L3

L4

C5

C6

C7

D2

D4

D6

C8

1uF

C2

1000uF

FUSE

AC Input

R2

-

+

C1

220uF

L5

M1

R5

C9

1000uF

R1

C3

1000uF

0.27Ω

R3

L6

C10

R6

C4

1000uF

R4

+5Vsb

R12

KA38XX ^C15

R15

R7

Vcc

R8

C14

C11

TL431

R13

R10

10nF

10ΚΩ

0.1uF

KA3505

R14

R11

R16

10ΚΩ

REMOTE ON/OFF

POWER GOOD

+5Vsb

D7

R15

330Ω

Q1

C12

R9 C13

2.2uF

62ΚΩ

0.47uF

10

KA3505

Current Mode Application Schematic

D1

D3

D5

L1

L2

L3

L4

C5

C6

C7

D2

D4

D6

C8

1uF

C2

1000uF

FUSE

AC Input

R2

-

+

C1

220uF

L5

M1

R5

C9

1000uF

R1

C3

1000uF

0.27Ω

R3

L6

C10

R6

C4

1000uF

R4

+5Vsb

R12

KA38XX ^C15

R15

R7

Vcc

R8

C14

C11

TL431

R13

R10

10nF

10ΚΩ

0.1uF

KA3505

R14

R11

R16

10ΚΩ

REMOTE ON/OFF

POWER GOOD

+5Vsb

D7

R15

330Ω

Q1

C12

R9 C13

2.2uF

62ΚΩ

0.47uF

11

KA3505

Mechanical Dimensions

Package

Dimensions in millimeters

16-DIP

6.40 ±0.20

0.252 ±0.008

#1

#16

#8

#9

3.25 ±0.20

0.128 ±0.008

0.38

MIN

7.62

0.300

0.014

3.30 ±0.30

0.130 ±0.012

5.08

MAX

0.200

12

KA3505

Ordering Information

Product Number

Package

16-DIP

Operating Temperature

KA3505

-25°C ~ +85°C

13

KA3505

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY

PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY

LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER

DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES

OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR

CORPORATION. As used herein:

1. Life support devices or systems are devices or systems

which, (a) are intended for surgical implant into the body,

or (b) support or sustain life, and (c) whose failure to

perform when properly used in accordance with

instructions for use provided in the labeling, can be

reasonably expected to result in a significant injury of the

user.

2. A critical component in any component of a life support

device or system whose failure to perform can be

reasonably expected to cause the failure of the life support

device or system, or to affect its safety or effectiveness.

www.fairchildsemi.com

10/29/02 0.0m 001

Stock#DSxxxxxxxx

2002 Fairchild Semiconductor Corporation


型号：	KA3505
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	PC SMPS Supervisory IC PC开关电源监控IC 电源电路开关电源管理电路光电二极管监控 PC
文件：	总14页 (文件大小：326K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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