SYSTEM GENERAL SG6105A Product Specification

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

FEATURES

 PC half-bridge (or 494) power supply supervisor +

two 431 + PWM

 High integration & few external components  Over-voltage protection for 3.3V, 5V, and 12V  Under-voltage protection for 3.3 V , 5V, and 12V  Under-voltage protection for –12V and/or –5V  Over-power and short-circuit protection  Power-down warning circuitry  Power-good circuitry  Delay time for PSON and PG signal  Remote ON/OFF function  On-chi p oscillator and error a mplifier  Two shunt regulators for 3.3V and 5V-standby  Latching PWM for cycle-by-cycle switching  Push-pull PWM operation and totem pole outputs  Soft-start and maximum 93% duty cycle

APPLICATIONS

Switching mode power supply for computers:

 AT  NLX  SFX (mi c ro-ATX)

DESCRIPTION

SG6105A controller is designed for switching-mode power supplies for desktop PCs. It provides all the functi ons ne cessa ry to m onit or and con trol the outp ut of the power supply. Remote ON/OFF control, power–good circuitry, and protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need for external dividers. An innovative AC-signal sampling circuitry provides a sufficient power-down warning signal for PG.

A built-in timer generates accurate timing for the control circuit, including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from saturation and ensures the fastest response for the short-circuit protection, which greatly reduces stress for power transistors. Two internal precision TL431 shunt regulators provide stable reference voltage and a driver for 3.3V and 5V standby regulation.

Utilizing minimum external components, the SG6105A includes the functions for push-pull and/or half-bridge topology, decreasing production c ost and PCB space, and increasing the MTBF for power supply.

查询SG6105A供应商

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

TYPICAL APPLICATION 1

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

TYPICAL APPLICATION 2

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

MARKING DIAGRAMS PIN CONFIGURATION

ORDERING INFORMATION

Part Number Pb-Free Package

SG6105ADZ

20-Pin DIP

20

1

SG6105ATP

XXXXXXXXYWWV

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

PSON

V33

V5

OPP

UVAC

NVP

V12

OP2

OP1

PG

FB2

VREF2

VREF1

FB1

GND

COMP

IN

SS

RI

VCC

T : D = DIP P : Z = Lead Free

Null=regular package

XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

PIN DESCRIPTIONS

Name Pin Type Function

PSON 1 Logic Input

Remote on/off logic input for CPU or controller. Turn on/off the PWM output after the 7.5ms

/ 26ms delay.

PSON = 0, the main SMPS is operational.

PSON =1, the main SMPS is off and the latch is reset.

V33 2 Analog Input 3.3V over-voltage/under-voltage control sense input.

V5 3 Analog Input 5V over-voltage/under-voltage control sense input.

OPP 4 Analog Input

Over-power sense input. This pin is connected to driver transformer or the Output of current

transformer. When not in use, this pin should be grounded.

UVAC 5 Analog Input AC fail detection, detect main AC voltage under-voltage and/or failure.

NVP 6 Analog Input The protection input for negative Output, such as –12V and/or –5V. Trip voltage = 2.1V.

V12 7 Analog Input 12V over-voltage/under-voltage control sense input.

OP1/OP2 9/8 Analog Output

The totem-pole Output drivers of push-pull PWM. The Output are enabled (low) only when

the NAND gate inputs are high. The maximum duty cycle on an Output (OP1 or OP2) is

46%.

PG 10 Logic Output

Power-good logic output, 0 or 1 (open-collector). PG = 1, the power is good for operation.

The PG delay is 300ms.

FB2 11 Analog Output Output for second converter regulation loop.

VREF2 12 Analog Input Reference comparison input for second converter regulation loop, 2.5V.

VREF1 13 Analog Input Reference comparison input for first converter regulation loop, 2.5V.

FB1 14 Analog Output Output for first converter regulation loop.

GND 15 Supply Ground.

COMP 16 Analog Output Error amplifier Output and the input of the PWM comparator.

IN 17 Analog Input

The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference

voltage.

SS 18 Analog Input

The soft-start, settable through an external capacitor. The current source output at this pin

is 8µA and the voltage is clamped at 2.5V.

RI 19

Program Analog

Input

Connected to external resistor for the reference setting. R

I

= 75kΩ.

VCC 20 Supply Supply voltage. 4.5V ~ 5.5V connected to 5V-standby.

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

BLOCK DIAGRAM

SS

2.5V

8uA

Vcc

NVP

+

6

Delay

7msec

Buffer

2.1V

3.2V

V33

V5

2 3

5V

64uA

UVAC

V12

7

5

UV Detector

OV Protector

UV Protector

COMP

_

COMP

+

_

COMP

_

DSD

0.7V

+

2uA

2.4V

OPP

4

Buffer

Vcc

PSON

1

+

1.4V

_

Delay 2msec

Delay

15msec

COMP

_

+

Delay 7msec

On/Off Delay

26msec

7.5msec

COMP

Q

D

CK

R

18

OP1

PG

10

RI

19

GND

15

20

VCC

Delay 300msec

Vref

Delay 3sec

FB2

11

VREF1 13

FB1

14

VREF2

12

+

Error Amp

_

COMP

_

+

O.S.C

COMP

16 17

IN

Q

_

CK

D

Q

R

SQ

OP2

8

9

SYSTEM GENERAL SG6105A Product Specification

Specifications and Main Features

Frequently Asked Questions

User Manual