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Product Specification Power Supply Supervisor + PWM
SG6108 DESCRIPTION
The SG6108 controller is designed for desktop PC switching mode power supplies. It provides everything necessary to monitor and control the output of the power supply. Remote ON/OFF control, power good circuitry, over-voltage protection, over-power protection, and over-current protection are all included. The SG6108 directly senses all the output rails for over voltage conditions without requiring external dividers. An innovative AC-signal sampling circuit provides an adequate power-down warning signal for PG. A built-in timer generates accurate timing for the control circuit. Cycle-by-cycle PWM switching protects the power transformer from saturation and ensures a rapid response for short-circuit protection. This greatly reduces the stress on the power transistors. The SG6108 utilizes a minimum number of external components while including all the functions needed for push-pull and/or half-bridge topologies. This decreases production costs and PCB space while increasing the power supply's MTBF.
FEATURES
PC half-bridge (or 494) power supply supervisor + PWM Highly Integrated and Few external components required Over voltage protection 3.3V/5V/12V (two 12V) Under voltage protection 3.3V/5V/12V (two 12V) Under voltage protection for -12V and/or -5V Over current protection 3.3V/5V/12V (two 12V) Over power protection Short circuit protection Power-down warning circuitry Power good circuitry Delay time for PSON and PG signals Remote ON/OFF function On-Chip oscillator and Error amplifier Latching PWM for cycle-by-cycle switching Soft-start Maximum 48% duty cycle
APPLICATIONS
Switching mode power supplies for computers such as ATX, NLX, and SFX (micro-ATX).
TYPICAL APPLICATION
+
12V
-12V
+
+ +
12V
+
+
5V
+ +
3.3V
Main Transformer
SG6108
UVAC IS12 IS5 IS33 V33 V5 V12 VS12B NVP RI
5Vsb Pok Pson
Vcc
PG Pson OP1
-12V -5V 5V 12V
Vdd
GND IN COMP OP2 OPP
SS
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Product Specification Power Supply Supervisor + PWM
SG6108 PIN CONFIGURATION
MARKING DIAGRAMS
20
SG6108TP
XXXXXXXXYWWV 1 T : D = DIP P : Z = Lead Free Null=regular package XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location
PSON V33 V5 OPP UVAC NVP VS12 OP2 OP1 PG
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VCC RI SS IN COMP GND IS33 IS5 IS12 VS12B
ORDERING INFORMATION
Part Number
SG6108DZ
Pb-Free
Package
20-Pin DIP
(c) System General Corp. Version 1.0.1 (IAO33.0048.B0)
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Product Specification Power Supply Supervisor + PWM
SG6108
PIN DESCRIPTIONS
Name
PSON
Pin
1
Type
Logic Input
Function
Remote On/Off logic input for the CPU or the controller. Turns the PWM output on/off following a 45 msec / 16 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. 3.3V over-voltage/under-voltage control sense input. 5V over-voltage/under-voltage control sense input. Over-power sense input. This pin is connected to the driver transformer or the output of the current transformer. When not in use, this pin should be grounded. AC fail-detection. This detects main AC voltage under-voltage and/or failure. The protection input for negative outputs, such as -12V and/or -5V. Trip voltage = 2.1V. 12V over-voltage/under-voltage control sense input. The totem-pole output drivers of a push-pull PWM. The outputs are enabled (low) only when the NAND gate inputs are high. The maximum duty cycle on an output (OP1 or OP2) is 48%. 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. Second 12V over-voltage/under-voltage control sense input. 12V over current protection sense input. The sink current = 8 x IRI 5V over current protection sense input. The sink current = 8 x IRI 3.3V over current protection sense input. The sink current = 8 x IRI Ground. The error amplifier output and the input of the PWM comparator. The negative input of the error amplifier. The positive input of the error amplifier is a 2.5V reference voltage. Soft-start. This can be set through the external capacitor. The current source output at this pin is 8uA and the voltage is clamped at 2.5V. This is connected to the external resistor to provide a reference setting. It determines the PWM frequency, and also the OCP current setting. Setting RI = 75k will result in a PWM frequency of 65kHz. Do not attach a capacitor to this pin. For OCP current settings please refer to the Over Current Protection section on page 13. Supply voltage. 4.5V ~ 5.5V. It is connected to the 5V-standby.
V33 V5 OPP UVAC NVP VS12 OP2/OP1 PG VS12B IS12 IS5 IS33 GND COMP IN SS
2 3 4 5 6 7 8/9 10 11 12 13 14 15 16 17 18
Analog Input Analog Input Analog Input Analog Input Analog Input Analog Input Analog Output Logic Output Analog Input Analog Input Analog Input Analog Input Supply Analog Output Analog Input Analog Input
RI
19
Program. Analog Input Supply
VCC
20
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Product Specification Power Supply Supervisor + PWM
SG6108
BLOCK DIAGRAM
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Product Specification Power Supply Supervisor + PWM
SG6108
TIMING DIAGRAM
VCC
PSON
3.3V,5V,12V
tpson(on) NVP tpson(off)
tuvp tnvp
SS(on/off) tpsoff
PG tPG
VCC
PSON
Voltage < VUVAC UVAC tOPP OPP
SS(on/off)
PG
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Product Specification Power Supply Supervisor + PWM
SG6108
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC, MAX IOUT VPIN, MAX PD,25 PD,90 TSTG RJA TJ,MAX TA,MAX TL
Parameter
DC Supply Voltage at Pin 20 Input Current at PG,FB Pins OP1, OP2, VS12, VS12B, IS12 OPP, UVAC, RI, SS, PG, IN, COMP, FB, NVP, IS5, V33, V5, PSON Power Dissipation (TA=25) Power Dissipation (TA=90) Storage Temperature Range Thermal Resistance, Junction-To-Case Operating Junction Temperature Operating Ambient Temperature Lead Temperature (Wave soldering or IR, 10seconds) ESD Capability, HBM model ESD Capability, Machine model
Value
6 30 -0.3 to 16 -0.3 to 7 1.5 0.5 -55 to +150 28.58 150 -20 to +85 260 3.0 200
Unit
V mA V V W W /W KV V
* All voltage values, except the differential voltage, are given with respect to the network ground terminal. * Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC TA
Parameter
DC Supply Voltage Operating Ambient Temperature
Value
4.5 to 5.5 -20 to +85
Unit
V
* For proper operation
Electrical Characteristics (VCC=5V, TA = 25C,RI=75Kohm,unless noted) VCC Section
Symbol
ICC1 ICC2
Parameter
Total Supply Current Total Supply Current
Test Condition
PSON=Low, OP1/OP2 1000pF PSON=High, OP1/OP2 1000pF
Min.
Typ.
Max.
10
Unit
mA mA
5
10
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Product Specification Power Supply Supervisor + PWM
SG6108
Protection Section
Symbol
VOVP1 VOVP2 VOVP3 VUVP1 VUVP2 VUVP3 VUVS1 VUVS2 VUVS3 VOPP* 1 VOPPH VX VNVP INVP TUVEDA TUVEDB TOVP TUVP TUVS TOPP TNVP TOCP TOCP(EN) VOFFSET IREF ILK33 ILK5 ILK12AB
Parameter
Over-Voltage Protection 3.3V Over-Voltage Protection 5V Over-Voltage Protection VS12,VS12B Under-Voltage Protection 3.3V Under-Voltage Protection 5V Under-Voltage Protection VS12,VS12B Under-Voltage Sense 3.3V for PG Low Under-Voltage Sense 5V for PG Low Under-Voltage Sense VS12,VS12B for PG Low Over-Power Protection (With TOPP delay time) Over-Power Protection (Without delay time) Disable Under Voltage / Over Power Protection threshold Negative Voltage Protection: Voltage Level Negative Voltage Protection: Source Current Under Voltage Enable Delay Time Under Voltage Enable Delay Time Timing for Over-Voltage Protection Timing for Under-Voltage Protection Timing for Under-Voltage Sense (PG Low) Timing for Over-Power-Protection Timing for Negative Voltage Protection Timing for Over-Current Protection Timing for Over-Current Protection Function Enable OCP Comparator Input Offset Voltage Ratio of IS33, IS5, IS12 to RI Current Setting V33 Leakage Current V5 Leakage Current VS12, VS12B Leakage Current
Test Condition
Min.
3.9 5.8 13.75 2.0 3.0 6.0 2.5 4.0 9.4
Typ.
4.1 6.1 14.05 2.6 3.6 7.2 2.8 4.3 10.1 2.3 3.2 0.3 2.1 64 17 30 0.7 2.7 1.6 6 7 20 17 30 8
Max.
4.3 6.5 14.35 2.8 3.9 8.0 3.0 4.5 10.4 2.37 3.4 0.4 2.2 72 22 40 1.35 4.2 2.2 8 10.2 25 22 40 5 8.4 50 50 50
Unit
V V V V V V V V V V V V V uA mS mS mS mS mS mS mS mS mS mV uA uA uA
VUVAC = 1.5V
2.23 3.0 0.2 2.0 57
VS12/B = 0.8V VS12/B = 5V
10 22 0.37 1.2 0.9 4 3.3 15
SS go Hi, VS12/B=0.8V SS go Hi, VS12/B =5V
10 22 -5 7.6
V33 = 3.3V V5= 5V VS12 =12V VS12B = 12V
Note *1: VOPP = (2/3) x VOPP + (1/3) x VUVAC ;
Power Good Section
Symbol
TPG TUVAC VUVAC VUVAC(DIS) TUVAC(DIS) TUVAC(EN) TR
*2
Parameter
Timing for PG Delay Timing for PG Fail UVAC Voltage Sense for PG Disable UVP,NVP,OCP Voltage Timing for Disable UVP,NVP,OCP Timing for Enable UVP,NVP,OCP PG Output Rising Time PG Falling Time Power Good Output Saturation Level Power Good Leakage Current
Test Condition
UVAC to PG
Min.
200 75 0.68 0.68
Typ.
300 150 0.7 0.7 150 25 1 300
Max.
400 300 0.72 0.72 300 35 3 500 0.5 1
Unit
mS uS V V uS mS uS nS V uA
UVAC < VUVAC(DIS) UVAC > VUVAC(DIS) CL =100pF Pull 2.2K to 5V CL =100pF Pull 2.2K to 5V IPG = 5mA VPG = 5V
75 15
TF *2 VOL2 IIO2
Note *2: Not tested in production test;
(c) System General Corp. Version 1.0.1 (IAO33.0048.B0)
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Product Specification Power Supply Supervisor + PWM
SG6108
Remote On/Off
Symbol
VPSON IPSON TPSON(ON) TPSON(OFF) TPSOFF
Parameter
PSON Input Threshold Level Remote Input Driving Current PSON to On/Off Time On Off PG Low to Power Off Time
Test Condition
Min.
1
Typ.
1.4
Max.
2.0 0.5
Unit
V mA mS mS
25 8 1.5
45 16 2
65 24 6.3
Error Amplifier
Symbol
V2.5 IIB*2 VDEV,T2.5 *2 ICOSI ICOSO AVOL * 2 BW * 2 PSRR * 2
Parameter
Reference Voltage Input Bias Current Deviation of V2.5 Over Temperature ICOMP Source Current ICOMP Sink Current Open-Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio
Test Condition
Min.
2.45
Typ.
2.5 10
Max.
2.55 0.1 30
Unit
V uA mV mA mA
IN Short COMP VCOMP=2.4V IN Short COMP VCOMP=2.6V
0.4 1.2 50 0.3 50 60 1
dB MHz dB
Oscillator Section
Symbol
FOSC DCMAX RI VREFRI TDEAD
Parameter
PWM Frequency Max Duty Cycle RI Resistor Range RI Reference Voltage PWM Dead Time
Test Condition
Min.
60 41 70 0.98 1.3
Typ.
65 44.5 1 1.7
Max.
70 48 105 1.02 2.1
Unit
KHz % K V uS
Soft-Start Section
Symbol
ISS ISSINK
Parameter
Charge Current Sink Current
Test Condition
Min.
6.7 1
Typ.
8
Max.
9.3
Unit
uA mA
PWM Output Section (OP1, OP2)
Symbol
VOL VOH RO
Parameter
Output Voltage Low Output Voltage High Output Impedance of VOH
Test Condition
Io = 20mA VDD = 5V
Min.
4 0.8
Typ.
Max.
1 2.6
Unit
V V k
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Product Specification Power Supply Supervisor + PWM
SG6108
TYPICAL CHARACTERISTICS
Total S upply C urrent (IC C 1 ) v s Tem perature
15 13
3.5 3.0
N egativ e V oltage P rotec tion: V oltage Lev el (V N V P ) v s Tem perature
IC C 1 (m A )
8 5 3 0 -40 -25 -10 5 20 35 50 65 80 95 110 125
V N V P ( V)
10
2.5 2.0 1.5 1.0 -40 -25 -10 5 20 35 50 65 80 95 110 125
Tem perature ( )
Tem perature ()
O v er- P ow er P rotec tion ( W ith T O P P delay tim e) (V O P P * 1 ) v s Tem perature
2.37 2.35 69 68
N egativ e V oltage P r otec tion: S ourc e C urrent ( IN V P ) v s Tem perature
2.31 2.29 2.27 2.25 2.23 -40 -25 -10 5 20 35 50 65 80 95 110 125
INVP (uA )
1
(V)
2.33
67 66 65 64 -40 -25 -10 5 20 35 50 65 80 95 110 125
V OPP *
T em per ature ( )
Tem perature ( )
O v er P ow er P rotec tion (W ithout delay tim e) (V O P P H ) v s Tem perature
3.4
Timing for Over-Power-Protection ( T O P P ) vs T e mp e r a tu r e
8.0 7.5 7.0
TOPP ( m S)
3.3
6.5 6.0 5.5 5.0
VOPPH (V )
3.2
3.1
4.5 4.0 -40
-40 -25 -10 5 20
3.0
-25
-10
5
20
35
50
65
80
95
110
125
Tem perature ()
35
50
65
80
95
110
125
T e mp e r a tu r e ( )
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Product Specification Power Supply Supervisor + PWM
SG6108
VS1 2 L e a ka g e C u r r e n t ( I L K 1 2 A B _ VS1 2 ) v s T e mp e r a t u r e
20 19 18 17 16 15
Tim ing for O v er-C urrent P r otec tion (T O C P ) v s Tem per ature
25 23 21 19 17 15 -40 -25 -10 5 20 35 50 65 80 95 110 125
IL K 1 2 A B _VS 1 2 ( u A)
T OCP (m S )
-40
-25
-10
5
20
35
50
65
80
95
110
125
T em perature ( )
T e mp e r a t u r e ( )
O C P C om par ator Input O ffs et V oltage (V O F F S E T ) v s Tem perature
5.0
V S 12B Leak age C urrent ( IL K 1 2 A B _ V S 12B ) v s T em perature
20
I L K 1 2 A B _ V S 12B (uA )
3.0 1.0 -1.0 -3.0 -5.0 -40 -25 -10 5
19 18 17 16 15
V O F F S E T (m V )
T e mp e r a t u r e ( )
20
35
50
65
80
95
110
125
-40
-25
-10
5
20
35
50
65
80
95
110
125
T em perature ( )
R atio of IS 12 to R I C urrent S etting ( IR E F ) v s Tem perature
8.4 8.3
U VAC Vo lta g e Se n s e f o r PG ( V U V A C ) v s T e mp e r a t u r e
0.72
0.71
IR E F
8.1 8.0 7.9 7.8 7.7 -40 -25 -10 5 20 35 50 65 80 95 110 125
V UV AC (V)
8.2
0.70
0.69
0.68 -40 -25 -10 5 20 35 50 65 80 95 110 125
Tem perature ( )
T e mp e r a tu r e ( )
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Product Specification Power Supply Supervisor + PWM
SG6108
R eferenc e V oltage (V 2 . 5 ) v s T em per ature
2.55 2.53
1.01 1.02
R I R e fe r e n c e Vo lt a g e (V R E F R I ) vs T e mp e r a t u r e
V R E F R I (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
V2.5 (V )
2.51 2.49 2.47 2.45
1.00
0.99
0.98 -40 -25 -10 5
Tem perature ( )
20 35 50 65 T em perat ure ( )
80
95
110
125
PW M F r e q u e n cy ( F O S C ) v s T e mp e r a tu r e
70 68
1.8 1.7
PW M D e a d T ime ( T D E A D ) vs T e mp e r a tu r e
TD E A D (u S)
FOSC (K Hz )
66 64 62 60 -40 -25 -10 5 20 35 50 65 80 95 110 125 T em p era t ure ( )
1.6 1.5 1.4 1.3 -40 -25 -10 5 20 35 50 65 80 95 110 125
T e mp e r a tu r e ( )
M ax D uty C y c le (D C M A X ) v s T em perature
47 46
C harge C urrent (IS S ) v s Tem perature
8.6 8.4 8.2
D C M A X (% )
IS S (uA )
-40 -25 -10 5 20 35 50 65 80 95 110 125
45 44 43 42
8.0 7.8 7.6 7.4 -40 -25 -10 5 20 35 50 65 80 95 110 125
T em perature ( )
Tem perature ( )
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Product Specification Power Supply Supervisor + PWM
SG6108 Application Guides
The application guide shows the key features of the SG6108 and illustrates how to use it in an ATX switching mode power supply (SMPS). The SG6108 is suitable for half-bridge, push-pull topologies. The PWM section of the SG6108 comprises a built-in 65kHz oscillator and high immunity circuits, which protect the system from noise interference and provide higher noise margins against improper PCB layout. The SG6108 has OVP, UVP, and OCP for the 3.3V and 5V signals, as wells as both 12V signals. NVP is used for negative voltage protection (-12V/-5V). UVAC (AC failure detection) is used to measure the AC line voltage.
Operation description
Protection against over-voltage, short-circuit and fault conditions is mandatory for PC power supplies. Many commonly used protection circuits require large numbers of discrete components and comparators which occupy significant PCB space and add to assembly costs. This single chip controller IC provides complete protection, shunt regulation, and PWM control with comparatively few components. The SG6108 is an ideal controller IC for PC switching mode power supplies. The features and benefits of this device are listed on the first page.
Feature Notes
Over voltage protection can be implemented without any additional components. Over-voltage sense levels are 3.3V/5V/12V or 4.1V/6.1V/14.05V. The SG6108's over current protection monitors the 3.3V, 5V, and the two 12V levels. The voltage difference across the external current shunt is used to provide accurate OCP. Over current and/or short circuit protection can also be implemented by using over-power protection. To do this, the OPP pin must be connected to the current transformer (driver transformer). The power good signal is asserted to indicate that the 3.3V/5V/12V signals are above the under voltage threshold level. The PG pin goes high when the above condition is reached. A 2k pull up resistor may be optionally connected to the 5V lead. VCC can be supplied from the 5V-standby. Whenever the VCC voltage exceeds 7V the entire SG6108 will be shutdown and reset (except for the shunt regulator). No extra power supply is needed. Complete PWM control circuitry includes an error amplifier for push-pull or half-bridge operation.
AC Failure Detection
UVAC is connected to the secondary power transformer through a resistor divider. UVAC is used for detecting the AC line voltage. Whenever the UVAC voltage drops below 0.7V for a period of time such as 150usec, the PG (power good) signal will be pulled low to indicate an AC line power-down condition. The voltage amplitude of the PWM switching signal in the secondary power transformer is proportional to the AC line voltage. The power-down warning threshold can be controlled by adjusting the resistor-divider ratio. A small
VS Vo
Vin
R1
+
R2 C1 0.7V
UVAC
Supervisory Circuit Operation
The PC generates the remote ON/OFF logic (PSON) signal. When this is "Low" the power supply is "On". When it is "High", the power supply is switched off. The remote ON/OFF signal is supplied to the PSON input.
capacitor must be connected between UVAC and ground to filter the switching noise.
Over Power Protection (OPP)
OPP (over power protection) is used to detect over power and short-circuit conditions. Whenever the VOPP voltage (p.7, Note-1) exceeds 2.3V for longer than 6msec the SG6108 will pull PG low and lock off the power outputs.
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Product Specification Power Supply Supervisor + PWM
SG6108 Negative Voltage Protection
NVP provides UVP (under voltage protection) for negative voltage outputs. An under-voltage condition indicates an overload at a negative voltage output. For example, the -12V output may drop to -10V during overload situations. The resistance of a resistor connected from NVP to the negative voltage output determines the protection threshold voltage. NVP outputs a 64uA constant current to the negative voltage output via this resistor. Whenever the NVP voltage exceeds 2.1V for longer than 7 msec the SG6108 will lock the power outputs off. VNVP = 64 uA x (R1 + R2) - V-12V The power outputs will be locked off when VNVP 2.1V.
OP1
Vdd
OP2 R1 R2 OPP C1 R3
Over Current Protection (OCP)
The SG6108 provides over current protection for the 3.3V, 5V and the two 12V rails. Whenever an OCP condition occurs at any of the voltage rails, PG will be low and PWM will be turned off. The internal OCP comparators have a very small offset voltage (5mV). The sink currents of IS33, IS5, and IS12 are 8 times the current at the RI pin. The current at the RI pin is VRI/RI. Here is an example demonstrating how to set the over current protection threshold: IRI = VRI/RI = 1.0V/75k = 13.3uA If R1 = 1700 and R12 = 0.01, then OC P = 13.3uA x 8 x 1700 / 0.01 = 18 A
64uA R1 R2 -12V
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+
2.1V
-5V
Product Specification Power Supply Supervisor + PWM
SG6108
REFERENCE CIRCUIT
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Product Specification Power Supply Supervisor + PWM
SG6108
PACKAGE INFORMATION 20 PINS - DIP (D)
D
20 11
E1
1 10
E
eB
A2 L e b1 b A1
A
Dimensions
Symbol
A A1 A2 b b1 D E E1 e L eB
Millimeters Min. Typ.
0.381 3.175 3.302 1.524 0.457 26.162 7.620 6.350 2.540 3.302 9.017 7
Max.
5.334 3.429
Inches Min.
0.015 0.125
Typ.
0.130 0.060 0.018 1.030 0.300 0.250 0.100 0.130 0.355 7
Max.
0.210 0.135
24.892 6.223 2.921 8.509 0
26.924 6.477 3.810 9.525 15
0.980 0.245 0.115 0.335 0
1.060 0.255 0.150 0.375 15
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Product Specification Power Supply Supervisor + PWM
SG6108
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