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

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

TIMING DIAGRAM

VCC

PSON

3.3V,5V,12V

t

PSON(ON)

t

UVP

NVP

t

PSON(OFF)

t

NVP

SS(on/off)

t

PSOFF

PG

t

PG

VCC

PSON

Voltage < V

UVAC

OPP

t

OPP

SS(on/off)

PG

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

VCC DC Supply Voltage at Pin 20 16 V

I

OUT

Output Current at PG, Fb1, Fb2 Pins 30 mA

V12, OP1, OP2, FB1, FB2, SS -0.3 to 16 V VPIN

PSON, V33, V5, VREF1, VREF2, OPP, UVAC, RI, NVP, IN, COMP, PG -0.3 to 7 V

P

D,25

℃

Power Dissipation (T

A

=25°C) 1.5 W

P

D,

９０℃

Power Dissipation (T

A

=90°C) 0.5 W

T

STG

Storage Temperature Range -55 to +150 °C

R

θJA

Thermal Resistance, Junction-To-Air 82.5 °C /W

T

J,MAX

Operating Junction Temperature 150 °C

T

A,MAX

Operating Ambient Temperature -30 to +125 °C

T

L

Lead Temperature (Soldering, 10 Seconds) 260 °C

ESD Electrostatic Discharge Capability, Human Body Model 3.0 KV

* All voltage values, except differential voltages, are given with respect to GND pin. * Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Test Condition Value Unit

V

CC

DC Supply Voltage 4.5 to 5.5 V

VFB Shunt Regulator Output Fb1, Fb2 Pins 4 to 16 V

TA Operating Ambient Temperature Range -25 to +85 °C

* For proper operat i on .

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

ELECTRICAL CHARACTERISTICS

Values are provided for 4.5V≦VCC≦5.5V, TA = -25°C~+85°C, RI = 75KΩ, unless noted.

Symbol Parameter Test Condition Min. Typ. Max. Unit

ICC Total Supply Current PG High 5 10 mA

V

OVP1

Over-Voltage Protection 3.3V 3.9 4.1 4.3 V

V

OVP2

Over-Voltage Protection 5V 5.8 6.1 6.5 V

V

OVP3

Over-Voltage Protection 12V 13.9 14.5 14.9 V

V

UVP1

Under-Voltage Protection 3.3V 2.0 2.6 2.8 V

V

UVP2

Under-Voltage Protection 5V 3.0 3.6 3.9 V

V

UVP3

Under-Voltage Protection 12V 6.0 7.2 8.0 V

V

UVS1

Under-Voltage Sense 3.3V for PG Low 2.5 2.8 3.0 V

V

UVS2

Under-Voltage Sense 5V for PG Low 4.0 4.3 4.5 V

V

UVS3

Under-Voltage Sense 12V for PG Low 9.4 10.1 10.4 V

V

OPP

(*)

Over-Power Protection (With T

OPP

Delay Time) V

UVAC

= 1.5V 2.25 2.32 2.39 V

V

OPPH

Over-Power Protection (Without Delay Time) 3.0 3.2 3.4 V

VX

Disable Under-Voltage / Over-Power

Protection Threshold

0.2 0.3 0.4 V

V

NVP

Negative Voltage Protection: Voltage Level 2.0 2.1 2.2 V

I

NVP

Negative Voltage Protection: Source Current 63 67 71 µA

T

OVP

Timing for Over-Voltage Protection

0.37 0.70 1.35 ms

T

UVP

Timing for Under-Voltage Protection

0.80 2.40 3.75 ms

T

UVS

Timing for Under-V oltage Sense for PG Low

0.37 1.20 1.88 ms

T

OPP

Timing for Over-Power Protection

5 7 9 ms

T

NVP

Timing for Negative Voltage Protection

3.3 7.0 10.2 ms

Note *: V

OPPS

= (2/3) x V

OPP

+ (1/3 ) x V

UVAC

.

Shunt Regulator Section Current

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

REF

Reference Voltage

I

FB

= 0.5mA, TA = 25℃

2.475 2.500 2.525 V

V

DEV, I

(**)

Deviation of V

REF

Over FB Current IFB = 0.5mA to 10mA 20 mV

V

DEV, T

(**)

Deviation of V

REF

Over Temperature 10 30 mV

R

EGLI-FB

(**)

Line Regulation

4 ≦ V

FB

≦ 15V

1 mV/V

I

OUT-FB

**

Output Sinking Current Capability V

FB

= 2V 10 mA

Note **: Not tested in producti on.

Power-Good Section

Symbol Parameter Test Condition Min. Typ. Max. Unit

TPG Timing for PG Delay RI = 75kΩ 200 300 400 ms

V

UVAC

UVAC Voltage Sense for PG 0.68 0.70 0.72 V

T

R

(**)

Power -Good Output Rising Time C

L

= 100pF, Pull 2.2K to 5V 1 3 µs

T

F

(**)

Power-Good Falling Time C

L

= 100pF, Pull 2.2K to 5V 300 500 ns

V

OL2

Power-Good Output Saturation Level IPG = 5mA 0.5 V

I

ON2

Power-Good Leakage Current Collector VPG = 5V 1 µA

Note **: Not tested in producti on.

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

Remote On/Off Section

Symbol Parameter Test Condition Min. Typ. Max. Unit

VIH High-level Input Voltage 2 V

VIL Low-level Input Voltage 0.8 V

V

HYSTERESIS

PSON Input Hysteresis Voltage 0.3 V

I

PSON

Remote Input Driving Current 0.5 mA

T

PSON(ON)

Timing PSON to On RI = 75kΩ 38 50 62 ms

T

PSON(OFF)

Timing PSON to Off (PS-off) RI = 75kΩ 8 16 24 ms

T

PSOFF

Timing PG low to Power Off RI = 75kΩ 1.5 2.0 6.3 ms

Error Amplifier Section

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

2.5

Reference Voltage TA = 25°C 2.46 2.50 2.54 V

I

IB

(**)

Input Bias Current 0.1 µA

A

VOL

(**)

Open-Loop Voltage Gain 50 60 dB

BW

(**)

Unity Gain Bandwidth 0.3 1.0 MHz

PSRR

(**)

Power Supply Rejection Ratio 50 dB

Note **: Not tested in producti on.

Oscillator Section

Symbol Parameter Test Condition Min. Typ. Max. Unit

F

OSC

PWM Frequency RI = 75kΩ 62 65 68 KHz

Soft-Start Section

Symbol Parameter Test Condition Min. Typ. Max. Unit

ISS Charge Current 7 8 9 µA

Comparator Section

Symbol Parameter Test Condition Min. Typ. Max. Unit

DC Duty Cycle 85 93 %

PWM Output Section

Symbol Parameter Test Condition Min. Typ. Max. Unit

VOL Output Voltage Low IO = 20mA 0.8 V

VOH Output Voltage High V12=12V 4 V

RO Output Impedance of VOH 1.5 3.3 kΩ

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

TYPICAL CHARACTERISTICS

Operating Suppy Current VS Temperature

4.900

5.100

5.300

5.500

5.700

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature ( )℃

IC C -O P(mA )

Reference Voltage VS T emperature

2.400

2.450

2.500

2.550

2.600

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature ( )

℃

V

REF

(V)

PWM Out Put Voltage

VS T emperature

3.000

4.000

5.000

6.000

-40 - 25 -10 5 20 35 50 65 80 9 5 110 125

Temperature ( )

℃

V

OH

(V)

Frequency VS Temperature

63.000

64.000

65.000

66.000

67.000

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature ()

Fosc(KHZ)

MAX Duty C ycle VS Temperature

89.100

89.150

89.200

89.250

89.300

89.350

89.400

89.450

89.500

-40 -25 -10 5 20 35 50 65 80 95 110 125

Te

mpera ture ( )℃

DCMAX(%

)

Reference Voltage VS Temperature

2.450

2.500

2.550

2.600

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature ( )℃

V

2.5

(V)

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

3.3V VUVP VS Temperature

2.540

2.550

2.560

2.570

2.580

2.590

2.600

2.610

-40 -25 -10 5 20 3 5 50 6 5 80 95 110 125

Temperature ( )℃

VUVP(V)

3.3V VOVP VS Temperature

4.100

4.120

4.140

4.160

4.180

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature ( )℃

VOVP(V)

5V VUVP VS Temperature

3.300

3.400

3.500

3.600

3.700

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature ( )℃

VUVP(V)

5V VOVP VS Temperature

6.100

6.120

6.140

6.160

6.180

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature ( )℃

VOVP(V)

12V VUVP VS T emperature

7.030

7.040

7.050

7.060

-40 - 25 -10 5 20 35 50 65 80 95 110 125

Temperature ( )

℃

VUVP(V)

12V VOVP VS T emperature

14.450

14.500

14.550

14.600

-40 -25 -10 5 20 35 50 65 80 95 110 125

Temperature ( )

℃

VOVP (V)

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

Example of Using SG6105A for the ATX Power Supply

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 add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function with fewer components. SG6105A is an ideal controller IC for PC switching mode power supplies.

The features and benefits of this device are:  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 c ont r o l

 Delay tim e for PSON and PS-off signal

 Two shunt regulators for 3.3V and 5V-standby

regulation

 Complete pulse width modulation (PWM) control

circuitry

 On-chi p o sci l lator  Programmable soft-start  Maximu m 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 for 3.3V, 5V, 12V, ar e 4.1V, 6. 1V,

14.5V, respectively.

 Over-current and/or short-circuit protection can also

be achie ved usin g over-p ower prote ction, in which the OPP pin is connected to the current transformer (driver transformer).

 The power-good signal is asserted to indicate the

3.3V, 5V, and 12 V is abo ve the under-voltage threshold level. PG pin goes high when the above

condition is reached. A 2K pull-up resistor may connect to 5V.

 The V

CC

can be supplied from the 5V-standby.

When the V

CC

voltage is hi ghe r than 7V, besi de s the shunt regulator, the circuit is shutdown and reset. No extra power supply is needed.

 Two in ternal high-pr ecision 431 shunt regulators ar e

built- in to provide stable reference voltages.

 Complete PWM control circuitry, including the

error amplifier for push-pull or half-bridge operation.

Supervisory Circuit Operation

The PC generates the remote ON/OFF logic

(PSON), which is “ Low” f or power s uppl y on a nd “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 features of SG6105A and illustrates how to design in an ATX switching mode power supply (SMPS). SG6105A is suitable for half-bridge, push-pull topology and incorporates with a four-channel supervisor, including 5V-standby. The PWM secti on of S G 610 5A c omp ri se s a bu ilt- i n 6 5kH z osc il la tor and high-immunity circuits, which protect the system from noise interference and provide more noise margins for improper PCB layout. SG6105A has OVP and UVP for 12V, 5 V, and 3.3 V. NVP is use d for ne gative vo ltage 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 200µs, the PG (power-good) signal is pulled low to indicate an AC line power-down condition. The voltage amplitude of the PWM switching

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

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.

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 exists for longer than 7ms, 6105A pulls the PG low and locks off the power outputs.

Negative Voltage Protection (NVP)

The NVP provides an under-voltage protection (UVP)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 64µA constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7ms, 6105A locks the power outputs off:

VNVP = 64µA × (R1 + R2) – V-12V (1)

The power outputs are locked off when VNVP ≥ 2.1V.

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

REFERENCE CIRCUIT

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

BOM

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

PACKAGE INFORMATION 20 PINS – DIP (D)

θ

e

B

E

A

A2

e

A1

L

b

b1

10

1

D

20

11

E1

Dimensions:

Millimeter Inch

Symbol

Min. T

yp

.Max.Min.T

yp

.Max.

A

5.334 0.210

A

1 0.381 0.015

A

2 3.175 3.302 3.429 0.125 0.130 0.135 b 1.524 0.060 b1 0.457 0.018 D 24.892 26.162 26.924 0.980 1.030 1.060 E 7.620 0.300 E1 6.223 6.350 6.477 0.245 0.250 0.255 e 2.540 0.100 L 2.921 3.302 3.810 0.115 0.130 0.150 eB 8.509 9.017 9.525 0.335 0.355 0.375 θ˚

0° 7° 15° 0° 7° 15°

Product Specification

Power Supply Supervisor + Regulator + PWM

SG6105A

SYSTEM GENERAL SG6105A Product Specification

Specifications and Main Features

Frequently Asked Questions

User Manual