System General SG6105TP Schematic [ru]

Product Specification

SG6

10

Power Supply Supervisor + Regulator + PWM SG6105

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 3.3V, 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-chip oscillator and error amplifier
 Two shunt regulator 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, such

as:

DESCRIPTION

SG6105 controller is designed for switching mode
power supply for desktop PCs. It provides all the
functions necessary to monitor and control the output of
the power supply. Remote ON/OFF control, power good
circuitry, some protection features against over-voltage
and over-power are implemented. It directly senses all the
output rails for OVP without the need of external dividers.
An innovated AC-signal sampling circuitry provides a
sufficient power-down warning signal for PG. A built-in
timer generates accuracy timing for control circuit
including the PS-off delay. The cycle-by-cycle PWM
switching prevents the power transformer from the
saturation and ensures the fastest response for the
short-circuit protection which greatly reduce the stress for
power transistors. Two internal precision TL431 shunt
regulators provide stable reference voltage and driver for

3.3V and 5V-standby regulation. Utilizing minimum
number of external components, the SG6105 includes all
of the functions for push-pull and/or half-bridge topology,
decreasing the production cost and PCB space, and
increasing the MTBF for power supply.

ATX NLX SFX (micro-ATX)

MARKING DIAGRAMS PIN CONFIGURATION

20

XXXXXXXYYWWV

1

T: D = DIP
P : Z = Lead Free

Null=regular package

XXXXXXX: Wafer Lot
YY: Year; WW: Week
V: Assembly Location

5TP

PSON

V33

V5

OPP

UVAC

NVP

V12

OP2

OP1

PG

1

7

10

20

2

3

4

5

6

8

9

19

18

17

16

15

14

13

12

11

VCC

RI

SS

IN

COMP

GND

FB1

VREF1

VREF2

FB2

©System General Corp. - 1 - www.sg.com.tw
Version 2.4(IRO33.0011.B1) Apr.7, 2004

Product Specification

p

Power Supply Supervisor + Regulator + PWM SG6105

ORDERING INFORMATION

Part Number Package

SG6105D 20-Pin DIP

SG6105DZ 20-Pin DIP(Lead Free)

PIN DESCRIPTIONS

Name Pin Type Function

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

PG 10 Logic output

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.

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

OPP 4 Analog input

PSON 1 Logic input

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

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

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

OP1/OP2 9/8 Analog output

FB1 14 Analog output Output for first converter regulation loop.

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

FB2 11 Analog output Output for second converter regulation loop.

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

RI 19

GND 15 Supply Ground.

Program.

Analog input

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

The PG delay is 300 msec.

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 grou nded.

Remote On/Off logic input for CPU or contr oller. Turn on/ off the PWM Output after the 7.5 msec / 26

msec delay.

PSON = 0 means that the main SMPS is operational.

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

The soft-start. It is settable through external capacitor. The current source output at this pin is 8uA and

the voltage is clamped at 2.5V.

The totem-pole output drivers of push-

gate inputs are high, the maximu m duty cycle on an output ( OP1 or OP2) is 46%.

Connected to external resistor for the reference setting.

RI = 75k ohms.

ull PWM. The output are enabled (low) only when the NAND

©System General Corp. - 2 - www.sg.com.tw
Version 2.4(IRO33.0011.B1) Apr.7, 2004

Product Specification

Power Supply Supervisor + Regulator + PWM SG6105

BLOCK DIAGRAM

V33 V5

2 3

V12

7

UVAC

5

19

10

PG

GND

15

VCC

20

RI

NVP

OPP

PSON

14

11

FB1

VREF1 13

FB2

VREF2 12

9

OP1

OP2 8

DSD

UV
Detect or

OV
Protec tor

UV
Protec tor

COMP

1.4V

3.2V

2.1V

2.4V

_

+

COMP

_

+

COMP

_

+

COMP

_

+

Delay

15msec

On/Off Delay

26mse c

7.5ms ec

De lay
7msec

Delay
7msec

Delay
2msec

5V

64uA

Buffer

6

Buffer

4

Vcc

1

0.7V

COMP

_

+

Vcc

CK

2uA

2.5V

18

8uA

SS

IN

QD

R

Vref

De lay
300msec

Delay
3sec

D

_

+

COMP

+
_

Error
Amp

16 17

O.S.C

Q

_

CK

Q

SQ

R

COMP

©System General Corp. - 3 - www.sg.com.tw
Version 2.4(IRO33.0011.B1) Apr.7, 2004

Product Specification

Power Supply Supervisor + Regulator + PWM SG6105

TIMING DIAGRAM

VCC

PSON

3.3V,5V,12V

NVP

t

t

PSON(ON)

t

t

PSON(OFF)

UVP

NVP

SS(on/off)

t

PSOFF

PG

t

PG

VCC

PSON

UVAC

Voltage < V

UVAC

OPP

t

OPP

SS(on/off)

PG

©System General Corp. - 4 - www.sg.com.tw
Version 2.4(IRO33.0011.B1) Apr.7, 2004