KA3505

KA3505 Datasheet

KA3505

Part	Datasheet
KA3505	KA3505 (pdf)

PDF Datasheet Preview
KA3505 PC SMPS Supervisory IC • 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 • 300ms Power Good Delay • Current Sense Setting Function With RI • Latch Function Controlled by PSON and Protection Input • 16-Pin Dual In-line Package 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. NORMAL = "LOW", FAULT = "HIGH" PGO Power Good Output 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. NORMAL = "HIGH", FAULT = "LOW" 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. OCP Over Current Protection 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. 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. UVP Under Voltage Protection It also has UVP functions for +3.3V, +5V, +12V outputs. The block is made up of a comparator with three detecting inputs. 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. 16-DIP 2002 Fairchild Semiconductor Corporation KA3505 Internal Block Diagram VS33 VS5 VS12 FPO PGI IS12 14 IS5 15 O VP Detector UVP Detector Internal Bias Start Up Bandgap Reference Vref VBG =1.25V Ir ef 20µA Vref ICHG PROT =20 µA COMP4 COMP1 Iref x 5 100µA COMP2 Iref x 5 100µA 0.6V COMP5 1 V Ordering Information Product Number KA3505 Package 16-DIP Operating Temperature -25°C ~ +85°C KA3505 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: 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. 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. 10/29/02 0.0m 001 2002 Fairchild Semiconductor Corporation

PDF Datasheet Preview

KA3505

PC SMPS Supervisory IC
• 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
• 300ms Power Good Delay
• Current Sense Setting Function With RI
• Latch Function Controlled by PSON and Protection Input
• 16-Pin Dual In-line Package

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.

NORMAL = "LOW", FAULT = "HIGH"

PGO Power Good Output

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.

NORMAL = "HIGH", FAULT = "LOW"

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.

OCP Over Current Protection

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.

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.

UVP Under Voltage Protection

It also has UVP functions for +3.3V, +5V, +12V outputs. The block is made up of a comparator with three detecting inputs.

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.
16-DIP
2002 Fairchild Semiconductor Corporation

KA3505

Internal Block Diagram

VS33 VS5 VS12

FPO PGI

IS12 14 IS5 15

O VP Detector

UVP Detector

Internal Bias

Start Up

Bandgap Reference

Vref

VBG =1.25V

Ir ef 20µA

Vref

ICHG PROT =20 µA COMP4

COMP1 Iref x 5 100µA

COMP2 Iref x 5 100µA
0.6V

COMP5 1 V
Ordering Information

Product Number KA3505

Package 16-DIP

Operating Temperature -25°C ~ +85°C

KA3505

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:

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.

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.
10/29/02 0.0m 001 2002 Fairchild Semiconductor Corporation

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived KA3505 Datasheet file may be downloaded here without warranties.

Datasheet ID: KA3505 634110