Sg6105d Data Sheets

Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

FEATURES

DESCRIPTION

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:

ATX

NLX

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.

SFX (micro-ATX)

MARKING DIAGRAMS

PIN CONFIGURATION

20 PSON

1

20

VCC

SG6105T

V33

2

19

RI

XXXXXXXYYWWV

V5

3

18

SS

OPP

4

17

IN

UVAC

5

16

COMP

NVP

6

15

GND

V12

7

14

FB1

OP2

8

13

VREF1

OP1

9

12

VREF2

PG

10

11

FB2

1

T: D = DIP XXXXXXX: Wafer Lot YY: Year; WW: Week V: Assembly Location

©System General Corp. Version 2.3(IRO33.0011.B0)

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

ORDERING INFORMATION Part Number

Package

SG6105D

20-Pin DIP

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

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.

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

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.

PSON

1

Logic input

Remote On/Off logic input forʳCPU or controller. 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.

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

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.

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%.

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

Program. Analog input

Connected to external resistor for the reference setting. RI = 75k ohms.

GND

15

Supply

Ground.

©System General Corp. Version 2.3(IRO33.0011.B0)

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

BLOCK DIAGRAM

V33

V5

V12

UVAC

RI

PG

GND

VCC

2

3

7

5

19

10

15

20

DSD Vref

2uA

UV Detector 0.7V

+

Delay 3sec

UV Protector

3.2V

FB1

13

VREF1

11

FB2

12

VREF2

Delay 300msec

OV Protector

5V

14

_ COMP

_ COMP +

64uA 2.1V

NVP

6

2.4V

OPP

4

_ COMP

2.5V D D

_ COMP

_

8uA

Q

Q

CK _ Q

+

CK

Delay 7msec

+

Buffer

Vcc

Delay 7msec

+

Buffer

9

OP1

8

OP2

COMP

R + _

1.4V

PSON

1

_ COMP +

On/Off Delay 26msec 7.5msec

©System General Corp. Version 2.3(IRO33.0011.B0)

O.S.C

Error Amp

Delay 15msec

Vcc

S

Delay 2msec

Q

R

18

17

16

SS

IN

COMP

-3-

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

TIMING DIAGRAM

VCC

PSON

3.3V,5V,12V tPSON(ON)

tUVP

NVP

SS(on/off)

PG

tNVP

tPSON(OFF)

tPSOFF

tPG

VCC

PSON Voltage < VUVAC UVAC

OPP tOPP SS(on/off)

PG

©System General Corp. Version 2.3(IRO33.0011.B0)

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

ABSOLUTE MAXIMUM RATINGS Symbol

Parameter

Value

Unit

VCC

DC Supply Voltage at Pin 20

16

V

VFB

Shunt Regulator Output at Fb1, Fb2 Pins

16

V

IOUT

Output Current at PG, Fb1, Fb2 Pins

30

mA

PD,25к

Power Dissipation (TA=25

1.5

W

PD,90к

Power Dissipation (TA=90

0.5

TSTG

Storage Temperature Range

-55 to +150

RθJA

Thermal Resistance, Junction-To-Air

82.5

TJ,MAX

Operating Junction Temperature

150

TA,MAX

Operating Ambient Temperature

-30 to +125

TL

Lead Temperature (Soldering, 10sec)

260

ESD Capability, HBM model

3.0

к) к)

W

к к/W к к к kV

Note: All voltage values, except differential voltage, are with respect to network ground terminal.

RECOMMENDED OPERATING CONDITIONS Symbol

Parameter

Value

Unit

VCC

DC Supply Voltage at Pin 20

4.5 to 5.5

V

VFB

Shunt Regulator Output at Fb1, Fb2 Pins

4 to 16

V

TOPER

Operating Ambient Temperature Range

-25 to +85

к

ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25°°C) Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

ICC

Total Supply Current

PG High

-

5

10

mA

VOVP1

Over-Voltage Protection 3.3V

-

3.9

4.1

4.3

V

VOVP2

Over-Voltage Protection 5V

-

5.8

6.1

6.5

V

VOVP3

Over-Voltage Protection 12V

-

13.9

14.5

14.9

V

VUVP1

Under-Voltage Protection 3.3V

-

2.0

2.6

2.8

V

VUVP2

Under-Voltage Protection 5V

-

3.0

3.6

3.9

V

VUVP3

Under-Voltage Protection 12V

-

6.0

7.2

8.0

V

VUVS1

Under-Voltage Sense 3.3V for PG Low

-

2.5

2.8

3.0

V

VUVS2

Under-Voltage Sense 5V for PG Low

-

4.0

4.3

4.5

V

VUVS3

Under-Voltage Sense 12V for PG Low

-

9.4

10.1

10.4

V

VOPPS* 1

Over-Power Protection.

VUVAC = 1.5V

2.02

2.4

2.66

V

VNVP

Negative Voltage Protection: Voltage Level

-

2.0

2.1

2.2

V

INVP

Negative Voltage Protection: Source Current

RI = 75kΩ

57

64

72

uA

tOVP

Timing for Over-Voltage Protection

RI = 75kΩ

0.37

0.7

1.35

ms

tUVP

Timing for Under-Voltage Protection

RI = 75kΩ

0.8

2.4

3.75

ms

tUVS

Timing for Under-Voltage Sense for PG Low

RI = 75kΩ

0.37

1.2

1.88

ms

tOPP

Timing for Over-Power-Protection

RI = 75kΩ

3.3

7

11.3

ms

tNVP

Timing for Negative Voltage Protection

RI = 75kΩ

3.3

7

10.2

ms

Note *1: VOPPS = (2/3) x VOPP + (1/3) x VUVAC ;

©System General Corp. Version 2.3(IRO33.0011.B0)

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

Shunt Regulator (FB1, VREF1, FB2, VREF2) Symbol

Parameter

Test Condition

VREF

Reference Voltage

IFB = 0.5mA, TA = 25

VDEV, I *2

Deviation of VREF Over Load Current

IFB = 0.5mA to 10mA

-

VDEV, T * 2

Deviation of VREF Over Temperature

TA = -25

-

REGLI-FB*2

Line Regulation

4 < VFB < 16V

-

IOUT-FB*2

Output Sinking Current Capability

VFB > 2V

10

к to 85к

к

Min.

Typ.

Max.

Unit

2.475

2.5

2.525

V

-

20

mV

10

30

mV

1

-

mV/V

-

-

mA

Note *2: Not tested in production test.

Power Good Section Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

tPG

Timing for PG Delay

RI = 75kΩ

200

300

400

ms

VUVAC

UVAC Voltage Sense for PG

-

0.65

0.7

0.75

V

tR*2

PG Good Output Rising Time

CL = 100pF

-

1

-

us

tF*2

PG Good Falling Time

CL = 100pF

-

300

-

ns

VOL2

Power Good Output Saturation Level

IPG = 5mA

-

-

0.5

V

ION2

Power Good Leakage Current Collector

VPG = 5V

-

-

1

uA

Remote On/Off Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VPSON

PSON Input Threshold Level

-

1

1.4

2.0

V

IPSON

Remote Input Driving Current

-

-

-

0.5

mA

tPSON(ON) tPSON(OFF)

Timing PSON to On/Off On Off (PS-off)

RI = 75kΩ

17 5

26 7.5

45 28.8

ms

tPSOFF

Timing PG low to Power Off

RI = 75kΩ

1.5

2

6.3

ms

Error Amplifier Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

V2.5

Reference Voltage

-

2.45

2.5

2.55

V

IIB*2

Input Bias Current

-

-

-

0.1

uA

AVOL * 2

Open-Loop Voltage Gain

-

50

60

-

dB

BW * 2

Unity Gain Bandwidth

-

0.3

1

-

MHz

PSRR * 2

Power Supply Rejection Ratio

-

50

-

-

dB

Oscillator Section Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

FOSC

PWM Frequency

RI = 75kΩ

60

65

70

KHz

Soft-Start Section Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

ISS

Charge Current

RI = 75kΩ

6

8

9.3

uA

©System General Corp. Version 2.3(IRO33.0011.B0)

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

Comparator Section Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

DC

Duty Cycle

-

85

-

93

%

PWM Output Section (OP1, OP2) Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VOL

Output Voltage Low

Io = 5mA

-

-

0.5

V

VOH

Output Voltage High

V12 = 12V

4

-

-

V

RO

Output Impedance of VOH

-

1.5

-

3.3

kΩ

©System General Corp. Version 2.3(IRO33.0011.B0)

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

APPLICATION 1

-12V

+

MAIN Transformer

12V

+

5V

+

3.3V

+

UVAC

V33 V5

3.3V

V12 VCC

5Vsb

VREF2 5Vsb 47~100ohm

STBY Transformer

PG

FB2

PSON

VREF1

+

OP1

SG6105

FB1

Pok 1Kohm

PSon

NVP

-12V

RI

-5V

GND 5V Vdd

IN

12V

COMP OP2 SS

OPP

©System General Corp. Version 2.3(IRO33.0011.B0)

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

APPLICATION 2

OPP

R61 CN2 3 2 1

R62

1

C39

F2 C40 2

2

1

OP1 D26

R63

L11 2

R65

2

D29 2

1

R66

+

1 Q13

C44

2

2

R71

R69

C48

OP2

1

1

2

3

2

4 5 10

TR2

2

2

2

10

6 8

U5

1

9

D35

D34 T7 E16-D

+

BD1 2

1

6 D33

5

2

4

R70 3

T6 C47

Q14 2

2

1

3

C46 D32

4

4

1

HHV

D31

3

1 T5

D30

R67

R68

3 1

+

3

1 2

U4 SG6848

NC FB GND

SEN NC VDD Gate 4

L12

D28

C42

C78

3 Q12

D27

8

2

7

8

RI

6

2

5

1

1

2 1

R64

1

C45

+ 2

1

2

3

1

C50 R75

D37

D38

R73

1

2

2

1

2

4

1

C49 R74

R77

R78

C52

1

C51

R79

C53

R80

R81

R82

1

1 R85 3

C56

3

Q15

1 L13 C57

2

2

VZ3

Q16

D39

2

2 2

VZ4 1

2

1

D40 1

2

1

HHV

+

R87

C58

7

D41

R88

5

C59

5VSB

C69

14

9

8

13

12

11

UVAC

10

T8

C60

V5

5V

3

VCC

V33

RI

V5

SS

D45

20 19 18

C61

C62 R91

-12V

7

GND

V12

FB1

OP2

VREF1

OP1

VREF2

16

5V R94 12V

C64

R95

15 R97 14

L14

FB1

R98

3

12V

NVP

COMP

8

13

VR3 2

VREF1

D43

R99

C65

C66

D44

2

OP2

1

1

6

UVAC

1

R96

5

2

UVAC

C63

1

R92

R93

3 1

IN

2

OPP

17

3 1

4

OPP D42

D46

R90 2

PSON

2

2

3.3V

-5V

1

1

U6 PSON

R89

R103 1

R104

2

R86

R84

R83

+

C55 VREF1

C54

+

+

+

FB1

1

R76

Q17

Q18 2

VREF2

7 5 3

D48 SG6105

R101

R102

C68

2

2

Q19 C67

PG

1

FB2

L15

D47 2

8 6 4

10

1

2

11

2

12

9

FB2

3 1

PG

1

10

1

9

OP1 R100

3 C73

C72 2

+

1

C74

R113

VREF2

1 L20

R115

1 C71

L19

-12V

+

+

+

L16 1

Q20 2

C75

R110

R111 2

R112

V5

R107

2

C79

L17

2

1 L18

+

FB2

+

1

C70

+ 1

R109

U7 LM7905

GND

3.3V

C77 +

3.3VSENCE

3

VO

R106

5V

VI

+ R116 R105

12V

2

2

C76

-5V

©System General Corp. Version 2.3(IRO33.0011.B0)

-9-

www.sg.com.tw June 19, 2003

Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

Protection against over-voltage, short-circuit and fault conditions is mandatory in PC power supplies. These protection circuits can be realized by using many discrete components and comparators, which occupy a lot of PCB space and also add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function and with less number of components. SG6105 is an ideal controller IC for PC switching mode power supplies.

threshold level. PG pin goes high when the above condition is reached. A 2K pull up resistor may connect to 5V. The VCC can be supplied from the 5V-standby. When the VCC voltage is higher than 7V, besides the shunt regulator, the circuit of SG6105 will be shutdown and reset. No extra power supply is needed. Two internal high precision 431 shunt regulators are built-in. It provides stable reference voltages. Complete PWM control circuitry including the error amplifier for push-pull or half-bridge operation.

The features and benefits of this device are listed below:

Supervisory Circuit Operation

Example of Using SG6105 for the ATX Power Supply

Over-voltage and under-voltage protection for 3.3V, 5V and 12V without external divider Over-power protection. UV protection for –12V and/or –5V. Power-down warning for power good signal. Power good signal and power-fail lockup Remote on/off control. Delay time for PSON and PS-off signal. Two shunt regulator for 3.3V and 5V-Standby regulation. Complete pulse width modulation (PWM) control circuitry. On-chip oscillator. Programmable Soft-Start. Maximum 93% duty cycle Few external components More reliable system Little space on PCB Easy trouble-shooting and implementation

FEATURE DESCRIPTIONS Over voltage protection can be implemented without any additional components. Over-voltage sense Levels or 3.3V, 5V, 12V are 4.1V, 6.1V, 14.5V respectively. Over current and/or short circuit protection can also be achieved by using over-power protection, in which OPP pin is connected to the current transformer (driver transformer). The power good signal is asserted to indicate the 3.3V, 5V and 12V is above the under voltage

©System General Corp. Version 2.3(IRO33.0011.B0)

- 10 -

The PC generates the remote ON/OFF logic (PSON), which is “Low” for power supply “On” and “High” to switch off the power supply. The remote ON/OFF is connected to PSON input.

APPLICATION GUIDES Introduction The application guide shows the key-feature of SG6105 and illustrates how to use in an ATX switching mode power supply (SMPS). SG6105 is suitable for half-bridge, push-pull topology. It incorporates with a 4-channel supervisor, including 5V-standby. The PWM section of SG6105 comprises a built-in 65kHz oscillator and high immunity circuits, which protect the system from noise interference and provide more noise margins for improper PCB layout. SG6105 has OVP and UVP for 12V, 5V and 3.3V. Besides, the NVP is used for negative voltage protection, such as –12V and/or –5V. The UVAC (AC fails detection) is applied to detect AC line condition. Two built-in internal precision TL431 shunt regulators can be used for 3.3V or 5V auxiliary standby power.

AC Fails Detection Through a resistor divider, UVAC is connected to the secondary power transformer for detecting the AC line condition. Once the voltage of UVAC is lower than 0.7V for a period of time, such as 200usec, the PG (power good) signal will be pulled low to indicate an AC line power-down condition. The voltage amplitude of the www.sg.com.tw June 19, 2003

Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM PWM switching signal in the secondary power transformer is proportional to the AC line voltage. Adjust the ratio of resistor divider to decide the threshold of power-down warning. A small capacitor is connected from UVAC to ground for filtering the switching noise. VS Vo

Vin

R1

+ R2

C1

UVAC

0.7V

Negative Voltage Protection The NVP provides an UVP (under voltage protection) for negative voltage outputs. An under-voltage represents the phenomenal of the overload condition in negative voltage output. For example, the –12V output may drop to –10V during the overload situation. A resistor determining the threshold of the protection is connected from pin NVP to the negative voltage output. Via this resistor, NVP outputs a 64uA constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7 msec, 6105 will lock the power outputs off. VNVP = 64 uA × (R1 + R2) – V-12V

Over Power Protection (OPP) The OPP (over power protection) is used for detecting over power and/or short-circuit conditions. When OPPS voltage (p.4, Note-1) is higher than 2.1V and this situation existed for longer than 7 msec, 6105 will pull the PG low and lock off the power outputs.

The power outputs will be locked off when VNVP ≥ 2.1V.

64uA R1

+

OP1

R2 -12V

2.1V

-5V

Vdd

R1

OP2

R2

OPP C1

©System General Corp. Version 2.3(IRO33.0011.B0)

R3

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Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

MECHANICAL DIMENSIONS 20 PINS – DIP (D)

Ӱ

D 11

20

E1

eB

E

10

1

A2

A

L e b1

A1

b

Dimension Symbol A A1 A2 b b1 D E E1 e L eB θ˚

Millimeter Min. Typ.

Max.

Inch Min.

Typ.

5.334 0.381 3.175

24.892 6.223 2.921 8.509 0̓

©System General Corp. Version 2.3(IRO33.0011.B0)

3.302 1.524 0.457 26.162 7.620 6.350 2.540 3.302 9.017 7̓

3.429

0.015 0.125

26.924

0.980

6.477

0.245

3.810 9.525 15̓

0.115 0.335 0̓

- 12 -

Max. 0.210

0.130 0.060 0.018 1.030 0.300 0.250 0.100 0.130 0.355 7̓

0.135

1.060 0.255 0.150 0.375 15̓

www.sg.com.tw June 19, 2003

Product Specification

SG6105

Power Supply Supervisor + Regulator + PWM

DISCLAIMERS LIFE SUPPORT System General’s products are not designed to be used as components in devices intended to support or sustain human life. Use of System General’s products in components intended for surgical implant into the body, or other applications in which failure of the System General’s products could create a situation where personal death or injury may occur, is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in medical applications.

MILITARY System General's products are not designed for use in military applications. Use of System General’s products in military applications is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in military applications.

RIGHT TO MAKE CHANGES System General reserves the right to change this document and/or this product without notice. Customers are advised to consult their System General sales representative before ordering.

©System General Corp. Version 2.3(IRO33.0011.B0)

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