20160902214505684.pdf

karta graficzna - XFX RT 580 8GB - jak zdiagnozowaĉ uszkodzenie?

Z pomiarów wynika że sekcje zasilania procesora i pamiêci sħ OK, ale jest zwarcie na pinach wtyku zasilania 8 pin. :idea: :!: Podaj opornoĥci z pomiarów na d³awikach zasilania chipa (0.5 ohm) i VRAM (ok.30-40 ohm) Wpisz w google ( gpu 8-pinout ) zobacz rozwiazanie swojego dodatkowego z³acza zasilania sprawdz bezpieczniki , oporniki "zerowe" fazy kontroluje NCP81022 * 5V apw8713= GS9238 Link * GS7256 to zasilanie kontrolera pamieci w chipie gpu https://obrazki.elektroda.pl/5940112500_1640345304_thumb.jpg czytaj (Product Introduction GS92A3) za³. Ważne sa napiecia na z³aczu PCIe


??????????? 0755-33653783

Product Introduction
GS92A3 - Wide input range High efficiency COT Buck Converter
Green Solution Technology Co., Ltd.

www.GStekic.com

??????????? 0755-33653783

GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Single Synchronous
Buck Converter
? Constant on Time
? Wide Output Load Range
? High efficiency
High efficiency
? Fast Transient Response
? Build-In 5V LDO

Product
P d t

Package
P k

App. 
pp
IOUT(A)

RDSON_H 
_
(mohm) 

RDSON_L 
_
(mohm) 

VIN(v)
VIN( )

VOUT Typ(v)
VOUT T ( )

PKG Power
Dissipation

GS92A2 

TQFN23_4X4

3~5

70

70

3~28

1.5, 3.3, 5

3.5w

GS92A3 

_
TQFN23_4X4

6~8

18

9.5

3~28

1.5, 3.3, 5

3.5w

GS9238

TQFN23_4X4

8

20

9.5

3~28

1.05, 1.5

3.5w

GS92A5 

TQFN20_5X5

8~10

12

7

3~28

1.5, 3.3, 5

4.2W

GS92B3

TQFN20_5X5
TQFN20 5X5

8 10
8~10

12

7

3 28
3~28

1.5, 3.3, 5
1.5, 3.3, 5

4.2W

2014-1-15

Confidential, for training only

2

??????????? 0755-33653783

GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Features
? Wide Input Voltage Range:3V~28V
? Adjustable 0 8V~20V Output Range
0.8V~20V
? ?1% Output Voltage Accuracy over Line and Load
? Constant-on-time control scheme for fast transient and high Efficiency
? Programmable Operation Frequency from 100kHz to 600kHz
? Integrated 18 mOhm at LDO=5V N-Channel MOSFET For High Side
? Integrated 9.5 mOhm at LDO=5V N-Channel MOSFET For Low Side
? Selectable Forced PWM or automatic PFM/PWM mode
? Under-Voltage Protection
? Over-Voltage Protection
? FB Short Protection
? Internal 5V Pre-regulator
? External Adjustable Soft-Start and Soft-Stop
? Over Temperature Protection
p
? Programmable Over Current Protection
? TQFN23-4x4 package
? Green Product (RoHS, Lead-Free, Halogen-Free Compliant)
2014-1-15

Confidential, for training only

3

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Adjustable Output Voltage Application 1
VIN accept wide range

IC power
by external
5V

2014-1-15

Confidential, for training only

4

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Adjustable Output Voltage Application 2

AIN and VIN
connect together

IC powered
by LDO

2014-1-15

Confidential, for training only

5

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Easy Setting(Solid Cap)

1.
1 VOUT S tti
Setting: RFB1 & RFB2
2. Frequency Setting: RTON
3. Current Limit: RCS
4.
4 Soft Start Time Setting: CSS
2014-1-15

Confidential, for training only

6

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Easy Setting(MLCC Cap)

1.
1 VOUT S tti
Setting: RFB1 & RFB2
2. Frequency Setting: RTON
3. Current Limit: RCS
4.
4 Soft Start Time Setting: CSS
5. RCC Compensation
2014-1-15

Confidential, for training only

7

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Functional Block Diagram

2014-1-15

Confidential, for training only

8

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Pin Descriptions
No.

I/O

Description

1

EN/DEM

I

Buck Enable Control Pin. EN=Low, Shutdown; EN=High, Auto-DEM Mode;
EN=Floating,
EN=Floating Forced CCM
CCM.

2

CS

I/O

Current Limit Detecting Input Pin. Connect LX Pin though an external resistor to set the
current limit threshold.

3

AGND

O

Signal GND.

4

FB

I

Feedback Input. Adjust the output voltage with a resistive voltage-divider between
the regulator's output and AGND.

5

VOUT

I

VOUT Pin offers the output information to the chip, in order to make the frequency
setting more accuracy. When OVP condition occurs, through this pin discharge the
energy of vout capacitor.
gy
p

6

TON

I/O

On-Time Setting Input. Connect a resistor between VIN and TON to set the on time
width.

7

AIN

I/O

Supply Input for internal analog circuitry.

8, 9, 22

VIN

I

10, 11, 16~18

LX

I/O

Upper Driver Floating Ground for Buck Controller. Connect to an external inductor.

12~15,
12 15 19

PGND

O

Power Ground
Ground.

20

BOOT

I

Bootstrap Capacitor Connection. Connect a capacitor between BOOT and LX Pin.

21

VCC

I/O

Internal Linear Regulator Output.

23

2014-1-15

Name

SS

I/O

Soft-Start Time Setting Pin. Connect a capacitor between SS and AGND to set the
soft-start time.

Supply Input. VIN is the regulator input. All VIN pins must be connected together.

Confidential, for training only

9

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Electrical Characteristics
(RTON=300KOhm, VIN=12V, VOUT=1.2V, EN/DEM=VIN, TA =25°C, unless otherwise specified)
Parameter

Symbol

Conditions

Min

Typ

Max

Units

Supply Voltage (VAIN)
Under voltage lock out (Rising)
UVLO Hysteresis
5V Pre-regulator (VVCC)
g
(
Output Voltage
Under voltage lock out (Rising)
UVLO Hysteresis

VAIN_UVLO

5.5

V

VAIN_UVLOHYS

0.2

V

VVCC

5.15

V

VVCC_UVLO

4.15

V

VVCC_UVLOHYS

0.3

V

0.8

V

Reference Voltage
FB Reference Voltage

VFB

VVCC=5V
5V

VEN_L

EN Falling

Enable Logic
EN Logic Low Voltage

EN Floating Voltage
oa g o age

EN Logic High Voltage

VEN F
EN_F

VEN_H

--

--

0.6

V

--

2.2

--

V

3.1

--

--

V

VIN Power On, Stable
State(Forced CCM)

EN Rising(DEM)

Current Parameters
Q
Quiescent

IQ

Soft start current

ISS

Shutdown Current

ISHTDN

FB=0.85V, VIN=12V
,

830

Vss=0

uA

10

uA

EN=0, I(VIN)

2014-1-15

IEN

4

--

--

0.01

EN=0, I(EN)
Logic Input Current

--

EN=0, I(TON)

-2

-1

--

uA
uA

EN=12V

--

13

EN=0V

-2

-1

--

uA
uA

Confidential, for training only

uA

10

??????????? 0755-33653783

GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Electrical Characteristics
(RTON=300KOhm, VIN=12V, VOUT=1.2V, EN/DEM=VIN, TA =25°C, unless otherwise specified)
System Time & Driver On-Resistance
On-Time

TON

VIN=12V, VFB=0.79V,
RTON=300K, VOUT=1.2V

300

ns

Minimum On-Time

TON_Min

VIN=12V, VFB=0.79V,
RTON=1K, VOUT=1.2V

100

ns

Minimum Off-Time

TOFFMIN

VIN=12V, VFB=0.79V,
RTON=300K

440

ns

BOOT-LX=5V

18

mohms

10

uA

9.5

mohms

10

uA

20

uA

4900

ppm/°
C

High Side MOS RDSON

RDSH

High Side Leakage

ILEAKH

Low Side MOS RDSON

RDSL

Low Side Leakage

ILEAKL

VCC-GND=5V

Current Sensing
CS Set Source Current

ICS

ICS current temperature
coefficient

TCS

On the bias of TA=25?

Current Limit 1 (Rising)

ILIM1

GND-LX, RCS=18K

324

360

396

mV

Current Limit 2 (Rising)

ILIM2

GND-LX, RCS=10K

180

200

220

mV

Current Limit 3 (Rising)

ILIM3

GND-LX, RCS=2.5K

35

50

65

mV

Zero Crossing Threshold

VT 0
T_0

GND LX
GND-LX

-10
10

10

mV

2014-1-15

VCS=1V

Confidential, for training only

11

??????????? 0755-33653783

GStek GS92A3 - Wide input range High efficiency COT Buck Converter
Electrical Characteristics
(RTON=300KOhm, VIN=12V, VOUT=1.2V, EN/DEM=VIN, TA =25°C, unless otherwise specified)
Voltage Fault Protection
V lt
F lt P t ti
UVP Threshold

VUV_TH

UVP Blank Time

TUV_B

UVP Fault Delay

TUV_D

OVP Threshold

VO
OV_TH

OVP Fault Delay

TOV_D

Measure at VFB, with
respect to reference
voltage
From Enable to UVP
80mV & lt; VFB & lt; UVP
Threshold
Force VFB below UVP
threshold
Measure at VFB, with
respect to reference
voltage
Force VFB above OVP
Threshold

45

%

1.6 ? 108 ? C SS

ms

20

us

125

%

20

us

Over Temperature Shutdown
Thermal Shutdown Threshold

TTSDN

150

°C

Thermal Shutdown Hysteresis

THYS_TSDN

20

°C

Bootstrap Diode
Internal Boost Charging Switch
On-Resistance

2014-1-15

RBT_D

VCC to BOOT, 10mA

Confidential, for training only

120

ohms

12

??????????? 0755-33653783

GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- Enable Function (PIN 1 - EN/DEM)

2014-1-15

Confidential, for training only

13

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- Enable Function (PIN 1 - EN/DEM)
Enable Logic
EN Logic Low Voltage
EN Floating Voltage
EN Logic High Voltage

2014-1-15

VEN_L
VEN_F
VEN_H

EN Falling
VIN Power On,
Stable State(Forced
CCM)
EN Rising(DEM)

--

--

0.6

V

--

2.2

--

V

3.1

--

--

V

Confidential, for training only

14

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- Current Limit Setting (PIN 2 - CS)

2014-1-15

Confidential, for training only

15

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- Current Limit Setting (PIN 2 - CS)
Current Sensing
CS Set Source Current
ICS current temperature
tt
t
coefficient
Current Limit 1 (Rising)

ICS

VCS=1V

20

TCS

On the bias of TA=25?

4900

ILIM1

GND-LX, RCS=18K

324

360

396

mV

Current Limit 2 (Rising)

ILIM2

GND-LX, RCS=10K

180

200

220

mV

Current Limit 3 (Rising)
(
g)

ILIM3

GND-LX, RCS=2.5K

35

50

65

mV

I LIMIT ?

2014-1-15

Confidential, for training only

uA
ppm/°C

RCS ? I CS
RDSL

16

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- Feedback Function (PIN 4 - FB)

2014-1-15

Confidential, for training only

17

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- Feedback Function (PIN 4 - FB)
Reference Voltage
FB Reference Voltage

2014-1-15

VFB

VVCC=5V

Confidential, for training only

0.8
08

V

18

??????????? 0755-33653783

GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- OVP & UVP Function (PIN 4 - FB)
Voltage Fault Protection
UVP Threshold

VUV_TH

Measure at VFB, with respect to reference voltage

45

%

UVP Blank Time

TUV_B

From Enable to UVP 80mV & lt; VFB & lt; UVP Threshold

1.6 ? 108 ? C SS

ms

UVP Fault Delay

TUV_D

Force VFB below UVP threshold

20

us

OVP Threshold

VOV_TH

Measure at VFB, with respect to reference voltage

125

%

OVP Fault Delay

TOV_D

Force VFB above OVP Threshold

20

us

2014-1-15

Confidential, for training only

19

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- UVP Function (PIN 4 - FB)
UVP Blank Time

2014-1-15

TUV_B

From Enable to UVP 80mV & lt; VFB & lt; UVP Threshold

Confidential, for training only

1.6 ? 108 ? C SS

ms

20

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- FB Short Function (PIN 4 - FB)

2014-1-15

Confidential, for training only

21

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- VOUT & TON Function (PIN 5 - VOUT, PIN 6 - TON)

2014-1-15

Confidential, for training only

22

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- VOUT & TON Function (PIN 5 - VOUT, PIN 6 - TON)

TON ?

f SW ?

2014-1-15

VOUT ? 8 p ? RTON
VIN ? 0.8

1
?VOUT ? 2.5V ?
8 p ? RTON

f SW ?

VOUT
VIN ? TON

f SW ?

VOUT
?VOUT ? 2.5V ?
20 p ? RTON

Confidential, for training only

23

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- AIN Function (PIN 7 - AIN)

2014-1-15

Confidential, for training only

24

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- AIN Function (PIN 7 - AIN)
Supply Voltage (VAIN)
Under voltage lock out
(Rising)
UVLO Hysteresis

VAIN_UVLO

5.5

V

VAIN_UVLOHYS

0.2

V

830

uA

Current Parameters
Quiescent

2014-1-15

IQ

FB=0.85V, VIN=12V

Confidential, for training only

25

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- LX Function (PIN 10, 11, 16~18 - LX)

2014-1-15

Confidential, for training only

26

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- LX Function (PIN 10, 11, 16~18 - LX)
Current Sensing
Zero Crossing Threshold

2014-1-15

VT_0

GND-LX

Confidential, for training only

-10

10

mV

27

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- BOOT Diode Function (PIN 20 - BOOT)

2014-1-15

Confidential, for training only

28

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- BOOT Diode Function (PIN 20 - BOOT)
Bootstrap Diode
Internal Boost Charging
Switch On-Resistance
On Resistance

2014-1-15

RBT_D

VCC to BOOT, 10mA

Confidential, for training only

120

ohms

29

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- VCC Function (PIN 21 - VCC)

2014-1-15

Confidential, for training only

30

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- VCC Function (PIN 21 - VCC)
5V Pre-regulator (VVCC)
Output Voltage
Under voltage lock
out (Rising) UVLO
Hysteresis

2014-1-15

VVCC

5.15

V

VVCC_UVLO

4.15

V

VVCC_UVLOHYS

0.3

V

Confidential, for training only

31

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- Soft Start Function (PIN 23 - SS)

2014-1-15

Confidential, for training only

32

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
PIN Circuit- Soft Start Function (PIN 23 - SS)
Current Parameters
Soft start current

ISS

Vss=0

10

TSS ?

2014-1-15

uA

1.6 ? C SS
? 1.6 ? 10 8 ? C SS ?ms ?
I SS

Confidential, for training only

33

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
1.Power on from EN
(CCM No Load)
CH1:VOUT CH2:LX CH3:EN

2014-1-15

(DEM No Load)
CH1:VOUT CH2:LX CH3:EN

Confidential, for training only

34

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
1.Power on from EN
(3.4A Load)

(1.47Ohm Load)

CH1:VOUT CH2:LX CH3:EN CH4: IOUT

2014-1-15

CH1:VOUT CH2:LX CH3:EN CH4: IOUT

Confidential, for training only

35

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
2. Vout Load Transient
(CCM 0A- & gt; 3.4A Load)
CH1:VOUT CH2:LX CH4: IOUT

2014-1-15

Confidential, for training only

36

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
2. Vout Load Transient
(DEM 0A- & gt; 3.4A Load)
CH1:VOUT CH2:LX CH4: IOUT

2014-1-15

Confidential, for training only

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
3. OVP & UVP
OVP:FB trigger

UVP

CH1:VOUT CH2:LX CH3: FB

2014-1-15

CH1:VOUT CH2:LX CH4: IOUT

Confidential, for training only

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter
4. Power on in short condition
CH1:VOUT CH2:LX CH4: IOUT

2014-1-15

Confidential, for training only

39

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GStek GS92A3 - Wide input range High efficiency COT Buck Converter

Thanks!
Th k !
Q & A

2014-1-15

Confidential, for training only

40


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