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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105 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.
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:
ATX
NLX
SFX (micro-ATX)
MARKING DIAGRAMS
20
PIN CONFIGURATION
PSON
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 FB1 VREF1 VREF2 FB2
SG6105T
XXXXXXXYYWWV
V33 V5 OPP
1
UVAC NVP V12
T: D = DIP XXXXXXX: Wafer Lot YY: Year; WW: Week V: Assembly Location
OP2 OP1 PG
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
ORDERING INFORMATION
Part Number
SG6105D
Package
20-Pin DIP
PIN DESCRIPTIONS
Name
VCC PG V33 V5 V12 OPP
Pin
20 10 2 3 7 4
Type
Supply Logic output Analog input Analog input Analog input Analog input
Function
Supply voltage. 4.5V ~ 5.5V. It is connected to 5V-standby. 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. 3.3V over-voltage/under-voltage control sense input. 5V over-voltage/under-voltage control sense input. 12V over-voltage/under-voltage control sense 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. Remote On/Off logic input for CPU 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. The protection input for negative output, such as -12V and/or -5V. Trip voltage = 2.1V. AC fail detection, detect main AC voltage under-voltage and/or failure. Error amplifier output and the input of the PWM comparator. The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference voltage. 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-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%. Output for first converter regulation loop. Reference comparison input for first converter regulation loop. 2.5V. Output for second converter regulation loop. Reference comparison input for second converter regulation loop. 2.5V. Connected to external resistor for the reference setting. RI = 75k ohms. Ground.
PSON
1
Logic input
NVP UVAC COMP IN SS OP1/OP2 FB1 VREF1 FB2 VREF2 RI GND
6 5 16 17 18 9/8 14 13 11 12 19 15
Analog input Analog input Analog output Analog input Analog input Analog output Analog output Analog input Analog output Analog input Program. Analog input Supply
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
BLOCK DIAGRAM
V33 2
V5 3
V12 7
UVAC 5
RI 19
PG 10
GND 15
VCC 20
DSD
UV Detector 0.7V OV Protector 2uA _ COMP + Delay 300msec Vref
14 13
FB1 VREF1
11
UV Protector Delay 3sec
FB2 VREF2
12
5V
3.2V
_ COMP +
64uA 2.1V
_ COMP + _ COMP +
NVP
6
Buffer
Delay 7msec
Vcc
2.5V D D Q 8uA
_
Q
2.4V
OPP
4
Buffer
Delay 7msec
CK R + _
+
CK _ Q COMP
9
OP1
Vcc
Delay 15msec
Error Amp
O.S.C
1.4V
_ COMP +
PSON
1
On/Off Delay 26msec 7.5msec
Delay 2msec
S R
Q
8
OP2
18 SS
17 IN
16 COMP
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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www.sg.com.tw June 19, 2003
Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
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
OPP tOPP
SS(on/off)
PG
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC VFB IOUT PD,25 PD,90 TSTG RJA TJ,MAX TA,MAX TL
Parameter
DC Supply Voltage at Pin 20 Shunt Regulator Output at Fb1, Fb2 Pins Output Current at PG, Fb1, Fb2 Pins Power Dissipation (TA=25 Power Dissipation (TA=90 Storage Temperature Range Thermal Resistance, Junction-To-Air Operating Junction Temperature Operating Ambient Temperature Lead Temperature (Soldering, 10sec) ESD Capability, HBM model ) )
Value
16 16 30 1.5 0.5 -55 to +150 82.5 150 -30 to +125 260 3.0
Unit
V V mA W W /W
kV
Note: All voltage values, except differential voltage, are with respect to network ground terminal.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC VFB TOPER
Parameter
DC Supply Voltage at Pin 20 Shunt Regulator Output at Fb1, Fb2 Pins Operating Ambient Temperature Range
Value
4.5 to 5.5 4 to 16 -25 to +85
Unit
V V
ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25C)
Symbol
ICC VOVP1 VOVP2 VOVP3 VUVP1 VUVP2 VUVP3 VUVS1 VUVS2 VUVS3 VOPPS* 1 VNVP INVP tOVP tUVP tUVS tOPP tNVP
Parameter
Total Supply Current Over-Voltage Protection 3.3V Over-Voltage Protection 5V Over-Voltage Protection 12V Under-Voltage Protection 3.3V Under-Voltage Protection 5V Under-Voltage Protection 12V Under-Voltage Sense 3.3V for PG Low Under-Voltage Sense 5V for PG Low Under-Voltage Sense 12V for PG Low Over-Power Protection. Negative Voltage Protection: Voltage Level Negative Voltage Protection: Source Current Timing for Over-Voltage Protection Timing for Under-Voltage Protection Timing for Under-Voltage Sense for PG Low Timing for Over-Power-Protection Timing for Negative Voltage Protection
Test Condition
PG High VUVAC = 1.5V RI = 75k RI = 75k RI = 75k RI = 75k RI = 75k RI = 75k
Min.
3.9 5.8 13.9 2.0 3.0 6.0 2.5 4.0 9.4 2.02 2.0 57 0.37 0.8 0.37 3.3 3.3
Typ.
5 4.1 6.1 14.5 2.6 3.6 7.2 2.8 4.3 10.1 2.4 2.1 64 0.7 2.4 1.2 7 7
Max.
10 4.3 6.5 14.9 2.8 3.9 8.0 3.0 4.5 10.4 2.66 2.2 72 1.35 3.75 1.88 11.3 10.2
Unit
mA V V V V V V V V V V V uA ms ms ms ms ms
Note *1: VOPPS = (2/3) x VOPP + (1/3) x VUVAC ;
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
Shunt Regulator (FB1, VREF1, FB2, VREF2)
Symbol
VREF VDEV, I *2 VDEV, T * 2 REGLI-FB*2 IOUT-FB*2
Parameter
Reference Voltage Deviation of VREF Over Load Current Deviation of VREF Over Temperature Line Regulation Output Sinking Current Capability
Test Condition
IFB = 0.5mA, TA = 25 IFB = 0.5mA to 10mA TA = -25 VFB > 2V to 85 4 < VFB < 16V
Min.
2.475 10
Typ.
2.5 10 1 -
Max.
2.525 20 30 -
Unit
V mV mV mV/V mA
Note *2: Not tested in production test.
Power Good Section
Symbol
tPG VUVAC tR*2 tF*2 VOL2 ION2
Parameter
Timing for PG Delay UVAC Voltage Sense for PG PG Good Output Rising Time PG Good Falling Time Power Good Output Saturation Level Power Good Leakage Current Collector
Test Condition
RI = 75k CL = 100pF CL = 100pF IPG = 5mA VPG = 5V
Min.
200 0.65 -
Typ.
300 0.7 1 300 -
Max.
400 0.75 0.5 1
Unit
ms V us ns V uA
Remote On/Off
Symbol
VPSON IPSON tPSON(ON) tPSON(OFF) tPSOFF
Parameter
PSON Input Threshold Level Remote Input Driving Current Timing PSON to On/Off On Off (PS-off) Timing PG low to Power Off
Test Condition
RI = 75k RI = 75k
Min.
1 17 5 1.5
Typ.
1.4 26 7.5 2
Max.
2.0 0.5 45 28.8 6.3
Unit
V mA ms ms
Error Amplifier
Symbol
V2.5 IIB*2 AVOL * 2 BW * 2 PSRR * 2
Parameter
Reference Voltage Input Bias Current Open-Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio
Test Condition
-
Min.
2.45 50 0.3 50
Typ.
2.5 60 1 -
Max.
2.55 0.1 -
Unit
V uA dB MHz dB
Oscillator Section
Symbol
FOSC
Parameter
PWM Frequency
Test Condition
RI = 75k
Min.
60
Typ.
65
Max.
70
Unit
KHz
Soft-Start Section
Symbol
ISS
Parameter
Charge Current
Test Condition
RI = 75k
Min.
6
Typ.
8
Max.
9.3
Unit
uA
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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www.sg.com.tw June 19, 2003
Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
Comparator Section
Symbol
DC
Parameter
Duty Cycle
Test Condition
-
Min.
85
Typ.
-
Max.
93
Unit
%
PWM Output Section (OP1, OP2)
Symbol
VOL VOH RO
Parameter
Output Voltage Low Output Voltage High Output Impedance of VOH
Test Condition
Io = 5mA V12 = 12V -
Min.
4 1.5
Typ.
-
Max.
0.5 3.3
Unit
V V k
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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www.sg.com.tw June 19, 2003
Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
APPLICATION 1
MAIN Transformer
+
-12V
+
12V
+
5V
+
3.3V
UVAC
V33 V5
3.3V
V12 VCC VREF2 5Vsb
5Vsb STBY Transformer 47~100ohm FB2 PG PSON NVP 1Kohm Pok PSon -12V -5V
+
VREF1
SG6105
FB1 OP1
RI
GND 5V Vdd IN 12V
COMP OP2 OPP SS
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
APPLICATION 2
OPP
R61 CN2 3 2 1 R62 C39 1 F2 1 OP1 D26 C45 21 1 R64 5 RI 6 7 8 U4 SG6848 2 2 1 D27 Q12 L11 D28 1 2 2 3 1 1 D30 HHV R68 R69 1 1 R71 2 1 Q13 3 C44 2 4 2 1 T5 C46 4 3 2 D32 2 1 1 3 Q14 2 2 6 5 10 D33 8 T6 C47 9 1 TR2 4 BD1 2 2 C49 R74 2 D38 R73 R77 C50 R75 1 1 4 2 2 1 1 1 3 C54 + R82 VZ4 1 2 1 HHV C58 C59 R88 T8 R89 C61 1 D43 1 D44 2 1 L15 2 10 1 2 L16 1 + 2 2 -12V 2 U7 LM7905 1 GND VO + 3 VI -5V R65 D29 2 + L12 3 2 C40 R63 1 2 2 2 D34 T7 E16-D + D35 + R78 R79 R80 C53 + C55 1 VREF1 R86 C56 C57 + R87 R83 R84 1 L13 2 2 R85 3 Q15 D39 1 2 2 3 Q16 D40 1 2 2 VZ3 1 R81 7 11 10 12 13 5 R98 3 1 3 1 R99 C65 2 Q17 2 2 VREF2 1 FB2 1 Q18 C66 8 6 4 7 5 3 V5 L19 2 5V V5 R104 U6 PSON 3.3V 5V -5V 2 -12V OPP D42 R92 UVAC R96 1 4 5 6 7 8 9 10 OPP UVAC NVP V12 OP2 OP1 PG SG6105 2 IN COMP GND FB1 VREF1 VREF2 FB2 17 16 15 R97 1 14 13 12 11 FB1 3 VREF1 VR3 2 L14 R93 C63 R94 12V R95 C64 1 2 3 PSON V33 V5 VCC RI SS 20 19 18 R90 2 2 R103 1 1 D45 D46 D48 R101 Q19 C67 D47 1 C68 2 3 1 R102 9 C70 + 1 1 L18 R112 2 1 + Q20 3 C73 2 1 + C72 2 + L17 R107 R115 L20 R110 C75 + C76 2 12V + R116 R105 R106 R109 3.3V NC FB GND C42 SEN NC VDD Gate C78 + C48 D31 R70 10 4 3 2 1 R66 R67 OP2 3 4 5 U5 2 6 8 D37 R76 C51 + FB1 C52 + 1 1 D41 5VSB C69 UVAC C62 R91 5V 12V OP2 OP1 R100 PG FB2 C79 + VREF2 C74 R113 3.3VSENCE
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14 C71 R111 C77
C60
2
8
9
Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
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.
Example of Using SG6105 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 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. The features and benefits of this device are listed below: 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
Supervisory Circuit Operation
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.
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
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
(c)System General Corp. Version 2.3(IRO33.0011.B0)
- 10 -
Product Specification 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
SG6105
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 x (R1 + R2) - V-12V
Vin
R1
+
R2 C1 0.7V
UVAC
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 R2 -12V
OP1
Vdd
R1
R2
OP2 OPP
C1
R3
(c)System General Corp. Version 2.3(IRO33.0011.B0)
- 11 -
+
2.1V
-5V
www.sg.com.tw June 19, 2003
Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
MECHANICAL DIMENSIONS 20 PINS - DIP (D)
D
20 11
E1
1 10
E
eB
A2 L e b1 b A1
A
Dimension
Symbol
A A1 A2 b b1 D E E1 e L eB
Millimeter 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
Inch 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
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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Product Specification Power Supply Supervisor + Regulator + PWM
SG6105
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.
(c)System General Corp. Version 2.3(IRO33.0011.B0)
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